Syed Mujtaba Shah

Syed Mujtaba Shah
Quaid-i-Azam University | QAU · Department of Chemistry

Ph.D

About

92
Publications
28,913
Reads
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1,506
Citations
Additional affiliations
August 2011 - present
Quaid-i-Azam University
Position
  • Professor (Assistant)
September 2007 - June 2010
French National Centre for Scientific Research
Position
  • PhD Student
September 2007 - June 2010
Aix-Marseille University
Position
  • PhD Student

Publications

Publications (92)
Article
Full-text available
A detailed account of the poly(vinylidene difluoride‐co‐hexafluoropropylene) (PVDF‐HFP)/succinonitrile (SN)/lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) based solid polymer electrolytes (SPEs) of various compositions is reported. SN is incorporated as plasticizer, while LiTFSI is employed as the source of lithium ions. Fourier transfer infra...
Article
Full-text available
In this work, we demonstrate a successful synthesis of heteroatom co‐doped TiO2 decorated with Ag nanoparticles using a direct combustion approach. These materials serve as a high‐performance active layer for advanced battery‐type supercapacitors. Among all the investigated materials, N,S co‐doped TiO2 nanoparticles and Ag/N,S co‐doped TiO2 nanocom...
Chapter
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In the last several decades, solid polymer electrolytes (SPEs) for Li-ion battery applications have been intensively explored as a safer alternative to the conventional liquid electrolytes currently employed in commercial devices. Although SPEs offer attractive properties such as dimensional stability, flexibility, better interfacial contact with e...
Article
Full-text available
Herein, a direct hydrothermal protocol for the synthesis of nickel‐based hydroxide/oxide nanocomposites grown on reduced graphene oxide (rGO) is presented. The materials are employed as a high‐performance active layer for advanced supercapacitors. Ni(OH)2/rGO and NiO/rGO nanocomposites demonstrate a high specific capacitance of 1255.12 and 636.84 F...
Article
A R T I C L E I N F O Keywords: Dye sensitized solar cell Dithizone Pyrocatechol violet Photovoltaics Solid-state electrolyte I-V curve A B S T R A C T A comparative study of ZnO//CdS/UIO-66 nanostructured based photoanode materials using two organic dyes as sensitizers in the presence of P3HT as solid state electrolyte has been reported here, UV-v...
Article
Nanocomposite solid polymer electrolytes (NSPEs) with PVDF‐HFP/Pluronic as blend polymer matrix, graphene oxide (GO) as nanofiller, and LiClO 4 are reported. FTIR spectroscopy reveals the crystal phase transformation of PVDF‐HFP from nonpolar α phase to electroactive γ phase upon salt addition that suggests the ion‐dipole interaction between the sa...
Article
Full-text available
Herein, we report the synthesis, characterization, and application of TiO2/ZnO and La-doped ZnO nanocomposites for the detection and degradation studies of Malachite Green (MG). TiO2/ZnO and La-doped ZnO nanocomposites were synthesized by reflux and hydrothermal methods, respectively, and characterized by UV–visible spectroscopy, X-ray diffraction,...
Article
Considering the great importance of nanocomposite based photo-active nanomaterials for a variety of electronics, photonics and photovoltaics application, it is always worth considering to synthesize new hetrostructure. This paper describes the sol-gel and hydrothermal synthesis of metal (holmium, barium, and cadmium) doped TiO2/CdS nanocomposites f...
Article
A low temperature ATRP of methacryloisobutyl POSS (POSS‐MA) is carried out, using poly(propylene glycol) (PPG)‐based macroinitiator, in toluene with CuCl/PMDETA as the catalyst system, generating well‐defined P(POSS‐MA)‐b‐PPG‐b‐P(POSS‐MA) triblock copolymer with Ð ~ 1.1. The semilogarithmic kinetic plot reveals first‐order kinetics and the dispersi...
Article
A photoactive nanohybrid material consisting of pyrocatechol violet, carminic acid and dithizone dyes functionalized silver and neodymium-doped TiO2/ZnO nanostructured materials is reported here, as photoactive blend, for solid-state dye sensitized solar cell. First of all we synthesized metals (silver, neodymium) doped (TiO2) Titanium oxide nanopa...
Article
Objective Doping of ZnS by the transition metal ions has perceived considerable attention in industrial applications in light-emitting displays and optical sensors. Herein, we have studied the effect of Fe doping on structural and optical properties of ZnS macro-spheres. Methods ZnS macro-sphere with and without Fe doping are synthesized by a simp...
Article
Full-text available
Herein, we report that an efficient nanohybrid material consists of Cd-doped ZnS nanocrystals (NCs), merocyanine and fullerene (C60-pyrrolidine tris acid). Cd-ZnS NCs serve as a substrate for supramolecular complexation between merocyanine 540 and fullerenes. The impact of grafting and co-grafting of dyes on the NCs surface was checked by Fourier t...
Article
Herein, we report that an efficient nanohybrid material consists of Cd-doped ZnS nanocrystals (NCs), merocyanine and fullerene (C60-pyrrolidine tris acid). Cd-ZnS NCs serve as a substrate for supramolecular complexation between merocyanine 540 and fullerenes. The impact of grafting and co-grafting of dyes on the NCs surface was checked by Fourier t...
Article
Cadmium and barium doped TiO2 nanoparticles and their respective heterostructured nanomaterials (TiO2/ZnO) were successfully synthesized through simple sol-gel and reflux methods respectively. Optical, structural and morphological analysis of as synthesized material were done by using UV–Vis spectroscopy, X-ray diffraction (XRD), Fourier transform...
Article
In this research work, bare ZnS, ZnS reduced graphene oxide (ZnS/rGO) and Cadmium doped ZnS reduced graphene oxide (Zn1-XCdXS/rGO) decorated nanocomposites were successfully synthesized through facile coprecipitation method. Optical and morphological analysis of these synthesized nanomaterials were done by using UV-Visible, florescence spectroscopy...
Article
Full-text available
ZnO nanorods have been synthesized with microwave treatment and co-precipitation method. Different concentrations of Ag@C and Pd@C nanospheres prepared by hydrothermal method were loaded onto ZnO nanorods. The sample obtained was characterized by x-ray diffraction (XRD), UV-vis reflectance spectroscopy (DRS), scanning electron microscopy (SEM), and...
Article
Wide-bandgap NiO nanoparticles (NPs) of 15 nm to 30 nm were synthesized by a facile sol–gel technique in basic medium from the precursor salt followed by calcination at 700°C. As-prepared NPs were used as an inorganic counterpart in the construction of sulfonic-acid-functionalized porphyrin (SAP)-based dye-sensitized solar cells (DSSCs). The proced...
Article
Full-text available
In this study, amidoxime-functionalized silica decorated with copper (AFS-Cu) was fabricated and tested for its catalytic application. Fourier transform infrared spectroscopy, scanning electron microscopy, energy dispersive X-ray spectroscopy, and X-ray diffraction were employed to characterize its structure and morphology. The application of AFS-C...
Article
Full-text available
The spinel La-Zn co-doped strontium nanoferrites having general formula of Sr1-xLaxFe2-yZnyO4 (0.0≤x≤0.1, 0.0≤y≤1.0) have been synthesized. X-ray diffraction studies have been revealed successful fabrication of ferrites. Scanning electron microscopy results have shown that size of the particle of the ferrite samples lie in nano-range. DC electrical...
Article
The spinel La-Zn co-doped strontium nanoferrites having general formula of Sr1-xLaxFe2-yZnyO4 (0.0≤x≤0.1, 0.0≤y≤1.0) have been synthesized. X-ray diffraction studies have been revealed successful fabrication of ferrites. Scanning electron microscopy results have shown that size of the particle of the ferrite samples lie in nano-range. DC electrical...
Article
Ferrites are materials of interest due to their broad applications in high technological devices and a lot of research has been focused to synthesize new ferrites. In this regard, an effort has been devoted to synthesize spinel Pr–Ni co-substituted strontium ferrites with a nominal formula of Sr1-xPrxFe2-yNiyO4 (0.0 ≤ x ≤ 0.1, 0.0 ≤ y ≤ 1.0). The c...
Article
Full-text available
Cadmium oxide nanoparticles were successfully synthesized through simple and low-cast sol-gel method. The optical, morphological, compositional and structural properties of as synthesized NPs were investigated by UV/Vis spectroscopy, fluorescence spectroscopy, scanning electron microscopy (SEM), energy dispersive X-Ray Analysis (EDAX), Fourier tran...
Article
Full-text available
In this work TiO 2 , Holmium doped (Ho-TiO 2 ) Titanium oxide nanoparticles (NPs) and the corresponding nanostructured combinations (Ho-TiO 2 /ZnO NC) were successfully synthesized through sol gel method and reflux techniques respectively. The prepared nano materials were characterized with the help of x-ray diffraction Analysis (XRD), UV–visible s...
Article
Full-text available
Nitroxide‐mediated radical polymerization (NMP) of the bulky methacryloisobutyl‐polyhedral oligomeric silsesquioxane (POSS‐MA) is successfully achieved after optimizing reaction conditions such as selection of controlling comonomer, comonomer feed molar ratio, and temperature (10 mol % styrene (S) comonomer at 110 °C using the commercially availabl...
Article
Full-text available
Un-doped zinc sulphide (ZnS) and noble metal-doped ZnS quantum dots were synthesized by chemical method. The synthesized nanomaterial was characterized by UV-Visible, Fourier Transformed Infra-red Spectrometer (FTIR), Fluorescence, High Resolution Transmission Electron Microscope (HRTEM) and X-ray Diffraction (XRD). Scanning electron microscope com...
Article
Keywords: Doping Band gap tuning Bromopyrogallol red dye (Br-PGR) Charge transfer complex Chemisorption Dye sensitized solar cells A B S T R A C T ZnO nanorods doped with different concentrations of Ag and Nd (1-7%) were synthesized by hydrothermal method. In this article we describe the synthesis, characterization and applications of pristine ZnO,...
Article
We report our findings on the effect of polyhedral oligomeric silsesquioxane (POSS) nanocages, incorporated into the block copolymer structure with poly(ethylene glycol) (PEG) via atom transfer radical polymerization, on the crystallization behavior of PEG‐b‐P(MA‐POSS) diblock copolymers. The PEG, which is a highly crystalline polymer, could no lon...
Article
A new series of well-defined amphiphilic hybrid polymers of tadpole-shaped architecture with polyhedral oligomeric silsesquioxane (POSS) nanocage as the hydrophobic head and poly(glycerol methacrylate) (PGMA) as the hydrophilic tail (POSS-PGMA) has been synthesized via atom transfer radical polymerization (ATRP). The aminopropylIsobutyl POSS, a mon...
Article
Full-text available
Un-doped zinc sulphide (ZnS) and noble metal-doped ZnS quantum dots were synthesized by chemical method. The synthesized nanomaterial was characterized by UV-Visible, Fourier Transformed Infra-red Spectrometer (FTIR), Fluorescence, High Resolution Transmission Electron Microscope (HRTEM) and X-ray Diffraction (XRD). Scanning electron microscope com...
Article
Full-text available
We present the qualitative and quantitative use of laser-induced breakdown spectroscopy (LIBS) for the compositional characterization of the doped material of zinc (Zn) and tin (Sn) nanoparticles. The transition metal zinc doped tin nanoparticles are synthesized via co-precipitation and hydrothermal routes. A single laser operating at a wavelength...
Article
The pristine and (Fe and Ni)-doped tin (IV) oxide (SnO2) nanosheets were synthesized by hydrothermal method. These nanosheets were characterized in detail by UV- visible spectroscopy, fourier transform infra-red (FT-IR) spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). TEM revealed...
Article
A series of Li-Cd doped cobalt ferrites CoLixCdxFe2−2xO4 (x = 0.0, 0.05, 0.1, 0.15, 0.2, 0.25) has been synthesized by hydrothermal method in the presence of cetyltrimethylammonium bromide (CTAB) as capping agent. XRD data has confirmed the formation of single crystalline cubic phase with average crystallite size of synthesized samples between 24 a...
Article
Highly photoactive merocyanine 540 is revealed to form charge transfer complex with zinc sulphide and cadmium sulphide nanocrystals confirmed by FT-IR Spectroscopy, Fluorescence emission and UV-Visible spectrophotometer. The semiconducting nanocrystals were synthesized by co-precipitation method and characterized by Fluorescence emission spectrosco...
Article
Well-defined amphiphilic comb-like pentablock copolymers based on Pluronic L64 (PEO13-b-PPO30-b-PEO13) and poly(ethylene glycol)methyl ether methacrylate (PEGMA) have been successfully synthesized via atom transfer radical polymerization (ATRP). The L64 is transformed into ATRP macroinitiator and chain extended with PEGMA under typical ATRP conditi...
Article
In this study, we fabricate a metal and vacuum-free electrode composed of aligned multiwall carbon nanotubes (MWCNTs) as top electrode in inverted type polymer solar cells. Simply drawn MWCNTs sheets from vertically grown arrays were directly transferred over the top layer (PEDOT:PSS) of device as anode material. Without any post treatment, devices...
Article
Cadmium sulphide (CdS) and Mn-doped CdS nanocrystals were synthesized by co- precipitation method. The nanocrystals were characterized by Fluorescence, Fourier Transformed Infra-red Spectrometer (FTIR), UV-Visible, X-ray diffraction (XRD), X-ray photoelectron spectrometer (XPS), Field Emission Scanning Electron Microscope (FESEM), and High Resol...
Article
Zinc sulphide (ZnS) and transition metal-doped ZnS nanocrystals were synthesized by co-precipitation method. Further the synthesized nanocrystals were characterized by Field Emission Scanning Electron Microscope (FESEM), High Resolution Transmission Electron Microscope (HRTEM), Fluorescence, UV-Visible, X-ray diffraction (XRD) and Fourier Transform...
Article
Zinc sulphide (ZnS) and Mn-doped ZnS nanoparticles were synthesized by wet chemical method. The synthesized nanoparticles were characterized by UV-visible, fluorescence, X-ray diffraction (XRD), fourier transform infra-red (FTIR) spectrometer, field emission scanning electron microscope (FESEM) and high resolution transmission electron microscope (...
Article
Zinc sulphide (ZnS) and Cu-doped ZnS nanoparticles were synthesized by the wet chemical method. The nanoparticles were characterized by UV-Visible, Fluorescence, Fourier Transform Infra-red Spectrometry (FTIR), X-ray diffraction (XRD), X-ray photoelectron spectrometry (XPS), field emission scanning electron microscopy (FESEM), and high resolution t...
Article
Full-text available
Here we report first time the direct observation of the nucleation and growth process of CdS nanowires by stirring of CdS nanoparticles. The growth process of CdS nanowires consist of three steps, the growth of CdS particles, nucleation of CdS nanorods and finally the growth of CdS nanowires. This method brings forward a new idea to synthesize nano...
Article
This article provides a facile one step synthesis of CdS (cadmium sulphide) and CdS/rGO (reduced graphene oxide CdS nanocomposites) using DMF (N, N-Dimethyl formamide) both as a solvent and a reducing agent for the reduction of grapheme oxide. XRD (X-ray diffraction), FESEM (Field emission scanning electron microscopy), EDX (Elemental dispersive X-...
Article
Zinc sulphide (ZnS) and cadmium doped ZnS (Cd-ZnS) nanoparticles were prepared by co-precipitation method and characterized by UV-Visible spectroscopy, X-ray diffraction (XRD) studies, Tranmission electron microscopy (TEM) and Scanning electron microscopy (SEM). The optical band gaps of the synthesized materials were calculated from UV-Visible abso...
Article
ZnO nanoparticles are widely used as electron acceptors in hybrid polymer blend solar cells as well as electron extraction materials in organic solar cells. Here, a study of the photochemical and electronic stability of poly(3-hexyl thiophene)/zinc oxide nanoparticle (P3HT/ZnO) interfaces is presented. Photostability is compared with device stabili...
Article
Full-text available
Unlabelled: Highly aligned multiwall carbon nanotubes (MWCNT) as fiber were modified with a conducting polymer via a simple dip coating method. Modified MWCNT exhibited admirable improvement in electrocatalytic activity for the reduction of tri-iodide in dye sensitized solar cells. Scanning electron microscopy images confirm the successful deposit...
Article
This article presents a comprehensive relative report on the grafting of ZnS with renowned ruthenium ((Ru) dyes i.e. N3, N719 and Z907) and gives insight into their charge transfer interaction and sensitization mechanism for boosting solar cell efficiency. Influence of dye concentration on cell performance is also reported here. ZnS nanoparticles s...
Article
Microemulsion method has been used for the synthesis of high resistive spinal nanoferrites with nominal composition Sr1−x Ndx Fe2−y Mny O4 (0.0 ≤ x ≤ 0.1, 0.0 ≤ y ≤ 1.0) for high frequency device applications. It has been confirmed by x-ray diffraction (XRD) results that these ferrites have a cubic spinal structure with a mean crystallite size rang...
Article
The work reports microemulsion synthesis of spinel nanoferrites having a nominal composition of Sr 1 À x Nd x Fe 2 À y Cd y O 4 (0.0r xr0.1, 0.0r y r1.0). X-ray diffraction (XRD) patterns of powdered products annealed at 1073 K for three hours revealed the cubic Spinel structure with an average crystallite size in the range of 23–35 nm. The room te...
Article
Zinc sulphide (ZnS) and Cd-doped ZnS nanoparticles, Zn1-xCdxS (x = 0.2 - 0.5), were synthesized by wet chemical method. Optical, electrical and photovoltaic properties of the nanoparticles were investigated. Scanning electron microscope (SEM) supplemented with EDAX was used to find grain size and chemical composition of the synthesized material. A...
Article
The paper reports the effects of lanthanum and aluminum ions, on the structural, electrical and magnetic properties of NiFe2O4 spinel ferrite nanoparticles. The precursors have been synthesized via a hydrothermal route in the presence of ascorbic acid (AA) using urea as a reducing agent and fuel for maintaining the uniform morphology and equal part...
Article
A platinum-free counter electrode composed of surface modified aligned multiwalled carbon nanotubes (MWCNTs) fibers was fabricated for efficient flexible dye-sensitized solar cells (DSSCs). Surface modification of MWCNTs fibers with simple one step hydrothermal deposition of cobalt selenide nanoparticles, confirmed by scanning electron microscopy a...
Article
Due to its unique nanocage-like architecture and properties, polyhedral oligomeric silsesquioxane (POSS) has received tremendous attention from researchers in areas ranging from material science and engineering to biomedical fields. This has created opportunities for the applications of POSS in non-traditional areas such as nanomedicines, Li-ion ba...
Article
A photo-active nano-hybrid material consisting of titania nanoparticles, carminic acid, and sulphonic acid functionalized porphyrin is reported here. In an attempt to extend the absorption spectrum of titania to visible region by co-adsorbing carminic acid and sulphonic acid functionalized porphyrin on its surface. Interesting changes in the UV-vis...
Article
Full-text available
CoFe2-2xLi x Cu x O4 (x=0.00, 0.05, 0.1, 0.15, 0.2, 0.25) spinel ferrite nanoparticles have been synthesized using a CTAB assisted hydrothermal method. Structural characterization of the ferrite powders was carried out using X-ray diffraction (XRD) and scanning electron microscopy (SEM). Employing X-ray diffraction analysis, the synthesized samples...
Article
The synthesis and characterization of amphiphilic pentablock copolymers based on Pluronic® L64 (PEO13-PPO30-PEO13) and poly(methyl methacrylate) (PMMA), synthesized via atom transfer radical polymerization (ATRP) is reported. The L64 is first transformed into a bifunctional ATRP macroinitiator which was subsequently chain extended with MMA by ATRP...
Article
One of the main goals of organic chemists is to find easy, environmentally friendly, and cost effective methods for the synthesis of industrially important compounds. Photocatalysts have brought revolution in this regard as they make use of unlimited source of energy (the solar light) to carry out the synthesis of organic compounds having otherwise...
Article
We report for the first time charge-transfer complex formation at the interface of carminic acid and cadmium sulfide (CdS) nanoparticles. The complex formation was confirmed by ultraviolet–visible (UV–vis) and fluorescence emission spectroscopy. Cadmium sulfide nanoparticles were synthesized by the wet chemical method and characterized by UV–vis sp...
Article
Full-text available
One of the challenges in improving the efficiency of hybrid solar cells is to remove crystal defects from the semiconducting nanoparticles. Here we report the synthesis, characterization and applications of transition metal doped ZnO nanorods in hybrid bulk heterojunction solar cells. Mn x Zn 1Àx O and Ni x Zn 1Àx O with dopant concentrations rangi...
Article
Full-text available
Two new nonionic surfactants; 1-sec-butyl-3-dodecanoylthiourea (DTU) and 1-dodecanoyl-3-phenylthiourea (DPTU) were synthesized and characterized by H-1 NMR, C-13 NMR and FTIR and UV-Vis spectroscopy. The detailed electrochemical fate of DTU and DPTU was investigated in a wide pH range of 2-12 by employing three electroanalytical techniques. The vol...
Article
Full-text available
Two samples of multi-responsive copolymer microgels, poly(N-isopropylacrylamide-co-acrylic acid) [P(NIPAm-co-AAc)], were synthesized by emulsion polymerization using different amounts of emulsifier. The unreacted monomers and surfactant were removed from the microgels by dialysis. Dynamic Laser Light Scattering (DLS) was used to determine the diffu...
Article
Polyhedral oligomericsilsesquioxane (POSS) are unique three-dimensional nanocages with a general composition of (RSiO1.5)n, where “R” groups, are organic moieties for enhanced physical and chemical compatibility of inorganic POSS framework with organic systems. Due to their unique size, structure, and properties there has been tremendous progress o...
Article
Porphyrin dyes have an inherent tendency to aggregate. This leads to a self-quenching phenomenon that hinders electron transfer to the conduction band of semiconductors in dye-sensitized solar cells. Self-quenching adversely affects the efficiency of solar cells. Here, we report the interaction of porphyrin with pristine and acid-functionalized ful...
Article
Polyhedral oligomeric silsesquioxane (POSS) compounds consist of unique three-dimensional nanocages with a general composition of (RSiO 1.5) n , where R groups are organic moieties for enhanced physical and chemical compatibility of inorganic POSS frameworks with organic systems. Due to their unique size, structure and properties there has been tre...
Article
Full-text available
The redox behaviour of a potential anticancer organic compound, 5,8-dihydroxynaphthalene-1,4-dione (DND), was investigated in 1 : 1 buffered aqueous ethanol using cyclic, differential pulse, and square wave voltammetry. The redox processes were found to occur in a pH-dependent diffusion-controlled manner. Presence of an α-hydroxyl group stabilised...
Article
Full-text available
Porphyrin dyes have an inherent tendency to aggregate. This leads to a self-quenching phenomenon that hinders electron transfer to the conduction band of semiconductors in dye-sensitized solar cells. Self-quenching adversely affects the efficiency of solar cells. Here, we report the interaction of porphyrin with pristine and acid-functionalized ful...
Article
Full-text available
Four compositions of thermo sensitive poly(N-isopropylacrylamide) polymer microgels were synthesized with different cross-linking contents by free radical emulsion polymerization. Hybrid gels were synthesized by reducing silver ions inside the polymer chains by using NaBH4 as a reducing agent. Effects of temperature and cross-linking density on the...
Article
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This research article describes the colloidal stability of poly(N-isopropylacrylamide-co-acrylic acid) [P(NIPAM-co-AAc)] polymer microgels with different acrylic acid contents in aqueous medium under various conditions of temperature, pH and sodium chloride concentrations. Three samples of multi-responsive P(NIPAM-co-AAc) polymer microgels were syn...
Article
Full-text available
The detailed electrochemistry of a biologically active isoquinoline, 2-benzoyl-7-methoxy-2,3-dihydroisoquinoline-4(1H)-one (IQN) was carried out in different pH media with the objective of elucidating its redox mechanism. Cyclic voltammetry was used to determine pka, diffusion coefficient and heterogeneous electron transfer rate constant. The invol...
Article
Full-text available
Ag NPs were synthesized by chemical reduction method and were optically characterized. The change in size of the nanoparticles and position of surface Plasmon resonance was studied as a function of concentration of different reactants by using UV-Visible spectroscopy. Red shift was observed in the position of SPR by increasing the concentration of...