Tarasankar Pal

• Indian Institute of Technology Kharagpur

Microporous ammonium phosphomolybdate (APM) as a catalyst is used to degrade tetracycline (TC) antibiotics under ambient conditions. APM is prepared and characterized. The microporosity and high surface area of the APM and Mo+6 present in it made it a useful catalyst for TC destruction in aerobic conditions. The Mo+6 present in APM is transformed t...

Zero valent arsenic nanoparticles (As(0)) in two different size ranges such as 55 ± 8 and 61 ± 9 nm were prepared by reducing As(III) using NaBH4, and designated as As1 and As2. Galvanic replacement reaction (GRR) of As(0) was employed for the synthesis of Ag nanoparticles (AgNPs) in two different size ranges. The as-prepared AgNPs i.e. AgNP1 and A...

In the recent past, near‐infrared (NIR) active photocatalysts have received tremendous research attention to harvest solar NIR energy as the solar spectrum carries abundant NIR light. Again, plasmonic materials with their intense surface plasmon resonance (SPR) activity in the visible and NIR range can be a suitable candidate for NIR active photoca...

Down scaling bulk materials can cause colloidal systems to evolve into microscopically dispersed insoluble particles. Herein, we describe the interesting applications of coinage metal nanoparticles (MNPs) as colloid dispersions especially gold and silver. The rich plasmon bands of gold and silver in the visible range are elaborated using the plasmo...

Galvanic replacement reaction (GRR) is a widely used powerful synthesis technique to produce different hollow nanoparticles. In the present work, As(0) nanoparticles in two different size ranges (e.g. 50±7 and 70±10 nm) are synthesized by sodium borohydride reduction of arsenite under controlled pH, and subsequently they are used as templates for G...

Yellow ammonium phosphomolybdate (YAPM), a waste product of all under graduate (UG) chemistry laboratory classes, has been proved to be an efficient adsorbent for environmental application as a cationic ion exchanger. The water insoluble YAPM selectively removes cationic dye molecules from dye contaminated wastewater. Consequently, dye infested YAP...

Chromism, generally a reversible color change of substances, finds vital applications in the fields of switching, catalysis, molecule binding, drug delivery and energy storage applications. Chromism is caused by the change of electronic, conformational, crystal or physical structure of materials due to heat, light, solvent/vapour, applied electric...

External influence is essential for any change to occur in this world. Similarly, the reaction path of a chemical reaction can be changed with the addition of a catalyst from outside. Sometimes a catalyst performs better when it remains associated with an inert substance, which is called a support material (SM). Improved catalyst accomplishment ari...

Chromism from phosphomolybdate – malachite green dye moiety through hydrogen bonding interaction with water molecules is reported. Interestingly, the substance with bound di-nitrogen or di-oxygen together with water molecules also exhibits color change. N2 or O2 binding vis-à-vis chromism is a new insight.

Benzophenone photoinitiator aided synthesis of Pd-nanodendrite embedded rGO nanocatalyst possessing superior potential in C–C coupling reaction and fuel cell application.

Contemporary research on electrochemistry revolves around fabricating cost effective catalysts using non-precious compounds for environmentally benign energy storage and production. Aiming at the engineering of such a proficient catalyst we report a novel synthesis of molybdenum disulfide (MoS2) particle decorated on reduced graphene oxide (rGO) sh...

Here, we report the modified photophysical property of luminescent bimetallic gold-silver cluster in the light of synergism. The syntheses of nanoclusters have been carried out using dopamine ligand. A blue shift of the emission peak for the bimetallic nanoclusters with enhancement in intensity in comparison to gold nanocluster in aqueous solution...

"Noble metal-Metal oxide Hybrid Nanoparticles: Fundamentals and Applications" explores the next generation of nanomaterials, which are constructed from at least two different nanomaterials, in order to overcome the limits of single components, to improve properties, to achieve new properties not presented in their counter-parts, and/or to achieve m...

In this article, we have judiciously interfaced copper oxides with graphitic carbon nitride (g-C3N4) from thermal reaction of melamine and copper sulfate in a one-pot protocol and manipulated the perforated sheet morphology thereafter. The CCN-X (X = 30, 40, 50, 60, and 70, depending on the wt % of CuSO4·5H2O) nanocomposites were prepared by homoge...

Here, we report the synthesis of dopamine (DA)-mediated Au–Ag bimetallic nanoclusters in aqueous solution under UV activation. The success story emerges from monometallic fluorescent nanocluster evolution from photoactivation of gold as well as silver precursor compounds along with DA. The intriguing fluorescence property of the nanocluster relates...

Artificial light harvesting system (LHS) with inorganic counterpart is considered to be robust as well as mechanistically simple while the system acts with donor-acceptor principle with unchanged structural pattern. Plasmonic gold or silver nanoparticles are mostly chosen as inorganic counterparts to design artificial LHS. To capitalize the electro...

Highly stable fluorescent glutathione (GSH)-protected AuAg assembly has been synthesized in water under UV irradiation. The assembly is composed of small Ag2/Ag3 clusters. These clusters gain stability through synergistic interaction with Au(I) present within the assembly. This makes the overall assembly fluorescent. Here, GSH acts as a reducing as...

Herein, for the first time we applied metal-metal bond energy factor for the evolution of porous Se-Te alloy. Porous Se-Te material has been prepared from their elemental states only through heating-cooling process in silicone oil without using any reagent, surfactant or capping agent. Surprisingly the reaction occurred at much lower temperature (2...

NiCo2O4 nanostructure is a widely studied pseudocapacitor material because of its high specific capacitance value. Most of the time, the thickness of the nanostructure inhibits the electrode material from whole-body participation and causes sluggish charge transportation. These phenomena directly interfere with the electrochemical performance of th...

Heterogeneous photocatalysis has become an encouraging reaction technique to combat energy crisis and global environmental issues. Visible light (~400 nm–750 nm)-driven photocatalysis is the most imperative heterogeneous photocatalysis because of its selective product delivery, easy operation, and utilization of abundant available clean energy reso...

Metal enhanced fluorescence of carbon dots has been reported in aqueous solution. Moderately fluorescing carbon dots (λex = 360 nm and λem = 440 nm) of 6–8 nm diameters (CDA) have been synthesized from freshly prepared aqueous ascorbic acid solution under modified hydrothermal treatment. The CDA fluorescence is quenched at the close proximity with...

In this work, we have disclosed the facile syntheses of morphologically diverse Cu2O nanoparticles using our laboratory designed modified hydrothermal reactor employing low-cost copper (II) acetate precursor compounds. The reaction conditions dovetail the effect of ethylene glycol (EG) and glucose to exclusively evolve the morphology tuned Cu2O nan...

The skilful synthesis of nanohybrids composed of noble metals (Au, Ag, Pt and Pd, as well as AuAg alloy) and metal oxides (ZnO, TiO2, Cu2O, MnO2, Fe2O3, WO3 and CeO2) have received considerable attention for applications in photocatalysis, solar cells, drug delivery, surface enhanced Raman spectroscopy and many other important areas. The overall ar...

Attention has been directed to prepare exclusive one-dimensional silver nanostructure from the linear inorganic polymer AgCN. Successive color change from yellow to orange, to red and finally to green reflects the evolution of high yielding Ag nanorods (NRs) from well-known -[Ag-CN]- chains of polymeric AgCN at room temperature. The parental 1D mor...

Fluorescence of a molecule is significantly enhanced in presence of an electron rich metal, kept at a definite distance from the fluorophore molecule. There surface plasmon of the metal couples with the molecular dipole and causes enhanced emission. This changed phenomenon changes the free space spectral properties of the fluorophore. Again, the in...

Cost-effective, highly active water oxidation catalysts are becoming increasingly demanding in the field of energy conversion and storage. Herein, simple modified hydrothermally (MHT) synthesized zinc and cobalt based hydroxyl double salt i.e., Zn4-xCoxSO4(OH)6• 0.5 H2O (ZCS) has been exfoliated for the first time as an efficient electrocatalyst fo...

A stable deliverable solid, carbon dot-MnO2 adduct, has been exclusively synthesized from a solution phase redox reaction between KMnO4 and moderately fluorescing carbon dot. Here, fluorescence resonance energy transfer (FRET) phenomenon happens within the adduct where energy is transferred from carbon dot to MnO2 making the solid adduct non-fluore...

The model 4-nitrophenol reduction has been carried out by different groups in presence of metallic or even non-metallic catalyst elaborating different mechanistic aspects. In the present investigation, we have thoroughly studied the hydrogenation of 4-nitrophenol in a completely metal free homogeneous condition. The introduction of a non-fluorescen...

In recent times, carbon dots have emerged as new fluorescent probes. The unique electronic and physical properties of carbon dots find significant applications in different fields like sensing, cell-imaging, catalysis, medicine etc. The intriguing fluorescence, cytocompatibility and nontoxicity of carbon dots are considered for their use in biologi...

Attention has been directed towards electron deficient boron doping in carbon dots (CDs) with the expectation of revealing new photophysical aspects in accordance with varying amount of boron content. It has been emphatically shown that boron uptake in CDs varies with different boron precursors evolving altered emissive CDs. Boron doping in CDs cau...

This report entails the syntheses of morphologically different silver molybdate by simple manipulation of experimental conditions (concentration variation and stirred/unstirred condition) using stoppered glass vial under mild heat (~80 ˚C) treatment. We have elucidated for the first time the etching of robust hexagonal ammonium phosphomolybdate (AP...

Scientists are looking for cost-effective, clean and durable alternative energy devices. Superior charge storage devices can easily meet the demands of our daily needs. In this respect, a material with suitable dimensions for charge storage devices has been considered to be very important. Improved performance of charge storage devices has been der...

Hybrid Cu2O-Ag is attractive because of its enormous application in the field of photocatalysis, Surface Enhanced Raman Scattering (SERS), and optical feature. In this report we have presented newer application of Cu2O-Ag. Cu2O-Ag has been found to exhibit excellent anionic dye adsorption property together with organic transformation for effective...

Morphology of a material with different facet, edge, kink, etc. generally influences the rate of a catalytic reaction.1,2 Herein, we account for the importance of altered morphology of a nanomaterial for a supercapacitor device and employed CoSn(OH)6 as an electrode material. Suitable fabrication of a stable aqueous asymmetric supercapacitor (AAS)...

Herein, the effect of diverse metal bromides for the shape evolution of palladium nanostructures (Pd NS) has been demonstrated. Aromaticity-driven reduction of bromopalladate(II) is optimized to reproducibly obtain different Pd NS at the water/organic layer interface. In this soft interfacial strategy, a redox potential driven reaction has been per...

A pH dependent normal Raman scattering (NRS) and surface enhanced Raman scattering (SERS) spectral patterns of citrazinic acid (CZA), a biologically important molecule, have been investigated. The acid, with different pKa values (~ 4 and ~ 11) for the two different functional groups (–COOH and –OH groups), shows interesting range of color changes (...

Herein, a Mn3O4 nanooctahedron (NO) supported Pd nanocomposite has been fabricated from a chosen thermodynamically allowed redox transformation reaction. The synthesized Pd-Mn3O4 (PMO) nanocomposite exhibits outstanding electrocatalytic activity for the hydrogen evolution reaction (HER) in acidic medium with a low overpotential (14 mV), small Tafel...

Different Schiff's base (SB) templates have been obtained to mediate phase selective synthesis of α- or γ-Fe2O3 from the same temperature condition. The inherent phase transformation tendency (γ-Fe2O3 to α-Fe2O3) is found to be inhibited. Again, the phase selective evolution emerges out of the binding modes of SBs which has been illustrated here. T...

Inspired by the attractive catalytic properties of palladium and inert nature of carbon support in catalysis, a concise and simple methodology for in-situ nitrogen-doped mesoporous carbon supported palladium nanoparticles (Pd/N-C) has been developed by carbonizing palladium dimethylglyoximate complex. The as-synthesized Pd/N-C has been exfoliated a...

Synergistic electronic interaction between the constituent metals in bi/ multimetallic system fine tunes its catalytic property to enhance that for individual metal analogues. Such a proposition towards enhancing catalytic activity of precious Rh metal by otherwise innocent Ag is done here in a cost effective dilution method. The generated heterost...

Herein, a wet-chemical synthetic approach has been adopted taking the advantage of electrostatic interaction between positively charged [CTA]+capped Au NRs and negative functionalities of graphene oxide (GO) to fabricate dog-bone shaped Au NRcore-Pt/Pdshell decorated reduced graphene oxide (rGO) nanosheets (GMTs) for efficient ethanol electrooxidat...

A uniform hierarchical Bi2O3/MnO2 nanoflowers (BM NFs) is fabricated via a reaction strategy by combining redox reaction and hydrothermal treatment. This wet chemical method first time reports one pot synthesis of Bi2O3/MnO2 nanoflowers via a thermodynamically allowed galvanic reaction between Bi(0) and KMnO4 in aqueous solution under modified hydr...

Synergism of gold and silver, causing enhanced fluorescence, has been reported in cluster science with higher photochemical stability and practical applications. There comes electronic factor, nuclearity, size effect etc., which bring autofluorescence, doping / alloying, aggregation induced fluorescence, core-shell interaction, oxidation induced in...

In this work, the syntheses of Cu2O as well as Cu(0) nanoparticle catalysts are presented. Copper acetate monohydrate produced two distinctly different catalyst particles with varying concentrations of hydrazine hydrate at room temperature without using any surfactant or support. Then both of them were employed separately for 4-nitrophenol reductio...

Surface plasmon resonance (SPR) is the manifestation of a resonance effect due to the interaction of conduction electrons of metal nanoparticles with incident photons. The interaction relies on the size and shape of the metal nanoparticles and on the nature and composition of the dispersion medium. By understanding the mechanistic aspects of the in...

We report an advanced aqueous asymmetric supercapacitor (AAS) comprised of Ni3V2O8@MWCNT (CNV) composite as the positive electrode and β [email protected]/* */ (GF) composite as the negative electrode. According to the literature surveyed, this new Ni3V2O8@MWCNT composite has been exploited for the first time as a positive electrode. We have prepar...

Fluorescent carbon dots (NSCDs) with a size of ∼5 nm (λex = 320 nm and λem = 386 nm) have been synthesized under reflux from an alkaline mixture of dopamine and cysteine. The synthesized NSCDs are hybridized with in situ generated silver nanoparticles (AgNPs) obtained by mixing AgNO3 at room temperature. NSCDs enrich the plasmonic bands of AgNPs du...

The problem of poor electron conductivity is always associated with pseudocapacitive electrode material that deters full utilization of the active material. To have a viable solution to this problem, we report fabrication of a composite material bringing highly conductive carbon nanotube (CNT) wrapped pseudocapacitive with Co(OH)2 nanoflakes. An in...

Supramolecular colorless copper(I)–thiourea hydrogel (Cu-TU gel) has been made a mechanically strong functional hybrid material in the graphene oxide (GO) framework. Mild heat treatment (85 °C) of the hybrid material fetches black product containing hierarchical copper sulfide decorated reduced graphene oxide nanosheets (CuS-rGO) through an obvious...

Ultrathin 2D Co3O4 and Co3V2O8 nanosheets have been produced from our modified hydrothermal technique (MHT). Both the materials have been proved to be extraordinary electrode materials for pseudocapacitors. The neat nanosheets of Co3O4 and Co3V2O8 exhibit a record specific capacitance value of 1256 F g(-1) and 4194 F g(-1) at 1 A g(-1) current dens...

Modified hydrothermal route (MHT) evolved Mn3O4 nanoparticles of ~60 nm diameter which anchored onto conductive multiwalled carbon nanotubes (MWCNTs) backbone again under MHT) producing energy storage composite. To obtain the benefits of low cost and stable MWCNT/Mn3O4 composite as supercapacitor, cyclic voltammetry (CV) and galvanostatic charging−...

Herein, we have implemented an intimate grinding-mixing protocol (GMP) for the synthesis of a new hydrogelator from citrazinic acid and melamine. Ground mixture upon sonication, just for few second, in a suitable solvent/mixed-solvent system finally results in a gel matrix. Citrazinic acid, is decorated with ureidopyrimidone functionality and melam...

The review addresses new advancement of metal, bimetallic, metal oxide, and composite particles in their nanoregime for facet selective catalytic application. Synthesis and growth mechanism of the particles have been accounted in brief in this review with a view to elaborate critical examination of the faceted morphology of the particles for cataly...

Tailored fabrication of noble metal based bimetallic nanoparticles decorated reduced graphene oxide (rGO) is highly demanding for their use as a clean, recyclable substrate for electrochemical performances. Here, we have successfully prepared Aucore@Pdshell with an average size of ~11.5 nm on rGO support (denoted as GAP) through a surfactant-free,...

In this report, CuS/ZnS heterojunction has been obtained through ion-exchange between as-prepared ZnS nanoflower (synthesized under modified hydrothermal route) and copper (II) sulfate in aqueous solution. Then the as-prepared CuS/ZnS with heterojunction prompted exceptional visible-light driven (λ ≥ 400 nm) photocatalytic activity surpassing almos...

Highly fluorescent Au(I)@Ag particles (emission maximum at 635 nm) have been obtained from a mixture of AgNO3, HAuCl4 and glutathione. Such Au(I)@Ag particles containing Ag2 and Ag3 clusters are produced when the reaction mixture is subjected to modified hydrothermolysis (MHT) reaction. The silver clusters make the solution intensely fluorescing an...

Surface plasmon resonance (SPR) is the collective oscillation of valence electrons in a metal stimulated by incident light. SPR in nanosized structures is called linear SPR (LSPR). Coinage metals show a very strong SPR in the visible region which is one of their inherent properties. Normally the LSPR of Cu, Ag, and Au nanoparticles exhibits distinc...

Arsenic detection, far below the WHO’s permissible limit, is reported from SERS studies. A stable deliverable FeOOH doped dendritic nanostructured Ag surface, obtained from a chosen galvanic reaction under ice cold condition, serves well as a SERS substrate that affirms affinity based arsenic detection down to ~10 -10 M level.

A logically chosen redox reaction of submerged Fe(0) in aqueous KMnO4 solution has been reported. The template free reaction condition produced gram amount of hierarchical flower like Fe3O4-MnO2 nanocomposite. More precisely fresh Fe(0) nanoparticles were prepared from air free hot water under submerged condition using a door magnet. The black Fe(0...

Nitrophenol reduction to aminophenol with a reducing agent is conveniently carried out in aqueous medium mainly with a metal or metal oxide catalyst. This reduction is presently considered as a benchmark reaction to test a catalyst nanoparticle. Thousands of original reports have enriched this field of nanoparticle catalyzed reaction. Synthesis of...

High purity Sn(0) has been obtained as a result of reduction of SnO by sodium stannite (Na2SnO2) in aqueous solution. The process stands unique for the production of tin metal. The as-synthesized tin finds applications in synthetic organic chemistry as a reagent for the allylation of aldehydes and ketones in distilled water at room temperature to g...

In this paper, we report the design, synthesis, and characterization of three different composite nanomaterials (Cu-ZnO, Cu-Cu2O-ZnO, and Cu2O-ZnO) with surface plasmon resonance (SPR) effect and/or n-p hetero-junction for visible light photocatalysis. We have accounted for the first time the SPR effect of Cu in photocatalysis for promotion of effi...

Herein, template or surfactant free synthesis of porous platinum nanostructures has been reported from a liquid–liquid interfacial synthetic technique. Here the progress of the Pt4+ reduction has been governed by an aromaticity driven pathway of 2,4 dihydropyridine ester (DHPE) in dichloromethane (DCM). Thus morphologically two different Pt nanostr...

Metal enhanced fluorescence (MEF) from organic molecules has been the focus of plasmonic/photonic research. In this regard, silver and gold particle stimulated fluorescence has received much attention. However, involvement of small organic molecules in solution has not been accounted for MEF. We have reported here that aqueous alkaline solution of...

A wet-chemical reaction strategy has been adopted exclusively for the production of porous copper sulfide with copper chloride (CuCl2. 2H2O) as a precursor salt and thioacetamide (TAA) in aqueous medium upon prolong standing at room temperature (~25 °C). The mixed phase copper(I) sulfide with tubular porous morphology has been derived from rod shap...

Mesoporous ZnFe2O4 nanoflowers (NFs) have been prepared using a modified hydrothermal (MHT) technique, developed in our laboratory. Urea has been brought in for hydrolysis of FeCl3 and ZnSO4 in solution to homogeneously precipitate ZnFe2O4. The precipitated product upon annealing at 450 °C results in mesoporous ZnFe2O4 NFs. Important physical metho...

Superhydrophobic surfaces prevent percolation of water droplets and thus render roll-off, self-cleaning, corrosion protection etc. which find day-to-day and industrial applications. In this work, we have developed a facile, cost effective, and free-standing method for direct fabrication of copper nanoparticles to engender superhydrophobicity for va...

A simple fluorometric technique has been adopted for cysteine (Cys) sensing in alkaline medium down to the nM level. The huge fluorescent signal of the solution is a consequence of fluorescent carbon dots (CDs) produced in situ from modified hydrothermal (MHT) reaction between Cys and dopamine (DA). It has been observed that inherent fluorescence o...

A vanadium complex, [(C5H5N)2V2O3.H2O] of different morphologies have been obtained via a modified hydrothermal procedure by using pyridine and VOSO4 salt as the starting material. The evolved [(C5H5N)2V2O3.H2O] nanobelts are of 50-200 nm in width and length up to several millimeters. At higher temperature (600°C), the solid [(C5H5N)2V2O3.H2O] nano...

Herein, we have implemented a modified sandwich strategy for surface enhanced Raman scattering (SERS) studies aimed at the accomplishment of remarkably enhanced vibrational signatures from preferred Raman probes. Here, para-phenylenediamine (or PDA) has been selected as the test molecule which can concurrently bind to two metal surfaces with its tw...

This paper describes an effective method for precursor salt assisted fabrication and reshaping of two different polyoxometalates [(NH4)2Cu(MoO4)2 (ACM) and Cu3(MoO4)2(OH)2 (CMOH)] of five distinctive shapes through straight forward and indirect routes. Explicit regulation in structural arrangements of ACM and CMOH has been studied in detail with al...

Selenium generally exhibits preferential habitual 1D growth as a result of redox reactions of selenium compounds. Commercial Se powder melts in silicone oil under refluxing conditions and upon subsequent cooling evolve amorphous Se nanoballs (SNBs). Further ultrapure crystalline 1D Se grows from SNBs due to solvent mediated oriented attachment.

A modified hydrothermal protocol (MHT) has been adopted for the synthesis of a single-crystal of CoV2O6.2H2O. The crystals grew up as a result of prolonged hydrothermal reaction between precursor salts of CoCl2 and ammonium vanadate. At first, adopted reaction conditions resulted in nanowires of CoV2O6.4H2O. Then with the increased reaction time na...

We report an environmental friendly synthetic strategy to fabricate reduced graphene oxide (rGO) based ternary nanocomposite where glutathione (GSH) acts both as a reducing agent for graphene oxide and sulfur donor for CdS synthesis under modified hydrothermal (MHT) condition. The report becomes interesting as pH variation evolves distinctly two di...

Ultralong Ag1.92Mo3O10 center dot H2O nanowires have been serendipitously obtained due to selective etching of ammonium phosphomolybdate (APM) only by Ag+ ions in water under stirring conditions. The spherical yellow APM particle upon etching by Ag+ ions generates a hollow sphere, and PO43- ions are expelled as a consequence of etching. The etching...

Commercially available salicylaldehyde, in alkaline medium, exhibits strong fluorescence after one hour of UV exposure in the presence of AgI. The phenolic group of salicylaldehyde is converted into the quinone form under alkaline conditions in the presence of AgNO3, resulting in aggregated Ag(0), which causes approximately 250 times fluorescence e...

The synthesis of exclusive ultra-long nanowire (NW) mediated by the inherent intercalative properties of vanadium pentoxide (V2O5) has been reported using a pyridine–nitric acid (Py–HNO3) system. It is worth noting that the introduction of HNO3 in the reaction mixture as an additive with pyridine generates vanadium oxide with only the V(+V) oxidati...

Giant Au(i)@Ag2/Ag3-thiolate clusters with strong fluorescence (λex 400 nm, λem 564 nm, and quantum yield 8.3%) have been prepared in aqueous medium from glutathione and corresponding precursor salts at neutral pH under sunlight. An intriguing synergism between Au(i)core and Ag(0)shell imparts long-term stability to the fluorescent giant clusters (...

Mesoporous nickel oxide nanoflowers (NiO NFs) are easily synthesized by developing a two step synthetic procedure based on modified hydrothermal (MHT) treatment of nickel acetate and ethanol amine in water followed by thermal decomposition at 350 °C for 4 h. After thermal treatment the porosity is increased by 18% with the retention of parental nic...

Hierarchical metal–semiconductor hybrid (Au–MnOOH) nanocomposite flowers with a hollow spherical base and prickly tipped divergent petals have been obtained for the first time by facile one step redox reaction. The wet chemical method reports a direct growth of Au–MnOOH nanocomposites through a redox reaction between Mn(II)-acetate and HAuCl4 in aq...

Thermochromic properties of a series of non-ionic copper compounds have been reported. Herein, we demonstrate that Cu(ii) ion with straight-chain primary amine (A) and alpha-linolenic (fatty acid, AL) co-jointly exhibit thermochromic properties. In the current case, we determined that thermochromism becomes ligand chain length-dependent and at leas...

To enhance the photocatalytic efficiency of ZnO nanomaterials, plasmonic Au nanoparticles (NPs) have deliberately been introduced into ZnO through a facile, inexpensive one pot hydrothermal approach. The enhanced photocatalytic efficiency was ascribed to surface plasmon resonance induced local electric field enhancement of Au. Thus the photoproduce...

Highly stable Au(i)core-Ag(0)shell particles have been synthesized in aqueous solution via a green chemistry pathway utilising sunlight irradiation. The shell of the particles is composed of fluorescent Ag2 and Ag3 clusters which make the large core-shell particles highly fluorescent. The Au(i) core of the particles offers long-term stability to th...

Herein, we report a new strategy to remove toxic Cr(VI) ion from aqueous solution using metal−organic hybrid gel as sorbent. The gel could be easily synthesized from the commercially available organic ligand 2-mercaptobenzimidazole (2-MBIm) and copper(II) chloride in alcoholic medium. The synthesis involves one-electron reduction of Cu(II) to Cu(I)...

Redox transformation reaction between aqueous AgNO3 and Mn(CH3COO)2 at low temperature (∼80 °C) has been adopted for industrial-scale production of uniform Ag–MnOOH composite nanowires for the first time. Varying amounts of incorporated Ag in the composite retain the 1D morphology of the composite. Nanowires upon annealing evolve Ag–MnO2 nanocompos...

In this work, we propose a systematic and delicate size and shape control synthesis of CuO-MnO2 composite nanostructures from time dependent redox transformation reaction between Cu2O and KMnO4. The parental size and shape of Cu2O nanostructures are retained even after the redox transformation but the morphology becomes porous in nature. Prolonging...

Importance of an interfacial reaction to obtain mesoporous leafy nanostructures of gold and palladium has been reported. A new synthetic strategy involving 1, 4-dihydropyridine ester (DHPE) as a potential reducing agent performs exceptionally well for the desired morphologies of both the noble metals at room temperature. The DHPE in turn transforms...

Decorated ternary Pd@CdS@Fe3O4 nanoarchitectures are synthesized by judicious loading of CdS nanoparticles without functionalizing the surface of the base materials, i.e., Fe3O4 and CdS. Here we have adopted a unique method to prepare Fe3O4 nanoparticles. In this ternary composite ferromagnetic Fe3O4 behaves as the catalyst carrier, CdS is used as...

Thiourea (TU), a commercially available laboratory chemical, has been discovered to introduce metallogelation when reacted with copper(II) chloride in aqueous medium. The chemistry involves the reduction of Cu(II) to Cu(I) with concomitant oxidation of thiourea to dithiobisformamidinium dichloride. The gel formation is triggered through metal-ligan...

The participation of sodium borohydride (NaBH4) in hydrogen bonding interactions and transient anion radical formation has been proved. Thus, the properties of NaBH4 are extended beyond the purview of its normal reducing capability and nucleophilic property. It is reported that ortho- and para-nitroanilines (NAs) form stable aggregates only in tetr...

A mild, template free protocol has been demonstrated for SnS2 nanoflake formation in gram level from SnCl2 and thioacetamide (TAA). The SnS2 nanoflakes congregate to nanoflowers and nanoyarns with variable TAA concentrations. BET measurements reveal that the synthesized nanomaterials are highly porous having very high surface area and the nanoflowe...

Condensation product of salicylaldehyde and 1,3 propylenediamine becomes a diiminic Schiff base which is oxidized by AgNO3 in alkaline solution and in turn stable Ag(0) is produced at room temperature. Under this condition the solution exhibits intense silver nanoparticle enhanced fluorescence (SEF) with the λem at 412 nm. Dopamine is selectively d...

The befitting capping capabilities of AsO4(3-) provide a stable Cu2O nanocatalyst from a galvanic reaction between a Cu(ii) precursor salt and As(0) nanoparticles. This stable Cu2O hydrosol appears to be a suitable catalyst for the one-electron transfer reversible redox reaction between Eosin Y and NaBH4. The progress of the reaction relates to thr...