Ambesh Dixit

• Doctor of Philosophy
• Professor at Indian Institute of Technology Jodhpur

Oxide materials will play a significant role in the development of rechargeable batteries. They have been shown to be effective cathode materials since the 1980s, however, due to their unusual properties their use in anodes and as solid-state electrolytes has recently gathered global scientific interest and is showing potential for both Li and Na b...

We grew a 2-μm-thick film of single-phase BiFeO3 on a Si (100) substrate by pulsed laser deposition with a substrate temperature of 575°C and an oxygen partial pressure of 0.06 mbar. X-ray diffraction analysis indicated that the film exhibits textured growth along the (110) plane and possesses a rhombohedral R3c structure. Investigations using scan...

We grew a 2 micron thick film of single-phase BiFeO3 on a Si (100) substrate by pulsed laser deposition with a substrate temperature of 575 oC and an oxygen partial pressure of 0.06 mbar. X ray diffraction analysis indicated that the film exhibits textured growth along the (110) plane and possesses a rhombohedral R3c structure. Investigations using...

We conducted a detailed study of electronic transitions and defects induced Urbach tail bands in various functional perovskite oxides (V2O5, BaSnO3, PbZr0.52Ti0.48O3, BiMnO3, and BiFeO3) using diffuse reflectance spectroscopy (DRS). We analyzed their DRS spectra using the Kubelka-Munk (KM) function, the Tauc plot, and the first derivative of the re...

Phase change materials are widely used for thermal energy storage media for different thermal energy storage applications ranging from building heating and cooling, transportation of heat-sensitive products, electronic cooling, solar water heaters, and waste heat recovery to concentrating solar power plants for their enhanced performance and effici...

The industrialization has severely impacted the ecosystem because of intensive use of chemicals and gases, causing the undesired outcomes such as hazardous gases, e.g. carbon monoxide (CO), nitrous oxide (NOx), ammonia (NH3), hydrogen (H2), hydrogen sulfide (H2S) and even volatile organic compounds. These hazardous gases are not only impacting the...

The magnetic properties and crystal chemistry of the novel Ba2CaCo2Si6O17 compound exhibiting one-dimensional zigzag chains of Co2+ ions (S = 3/2) are investigated using powder X-ray diffraction (PXRD), scanning lectron microscopy, energy dispersive-Xray spectroscopy, and temperature and field-dependent magnetic measurements. The refinement of PXRD...

Janus transition metal dichalcogenides (JTMDs) have garnered significant interest from the scientific community owing to their remarkable physical and chemical features. The existence of intrinsic dipoles makes them different from conventional transition metal dichalcogenides. These properties are useful in various potential applications, including...

We demonstrated the coexistence of memresistance, memcapacitance, and meminductance non‐volatile bipolar analog resistive switching in Cu (top electrode)/CuO (active layer)/SS (bottom electrode) memory devices with and without presence of the light. The onset of memcapacitance and meminductance is noticed from the pinched‐shaped characteristics in...

: Carbonaceous materials of two different types, viz. spherical nano carbon black (NCB) powder (Brunauer-Emmett-Teller (BET) surface area ~1400 m2/g) and multiwalled carbon nanotube (MWCNT) (BET surface area ~75 m2/g), have been impregnated in room temperature vulcanized (RTV) silicon rubber matrix to study the effect of geometries of filler partic...

Owing to iron's natural abundance, low cost, and affordability, nonaqueous rechargeable iron‐ion (Fe‐ion) batteries have the potential for alternative rechargeable energy‐storage devices. However, developing cathodes with adequate superior Fe²⁺ storage during charge–discharge is a major challenge. Herein, V2O5 porous microspheres (V2O5–PMS) are syn...

The paper reports the fabrication of a device, based on the thin film of Ag-doped WO 3 nanoparticles, to enhance the hydrogen gas sensing performance. The synthesis of thin films of pristine and Ag-doped WO 3 nanoparticles were carried out using the single-step hydrothermal method, followed by the spin coating deposition process. The characterizati...

The standard Nakagami (NK) distribution is a two-parameter distribution applicable in various disciplines, such as, communication engineering, hydrology, medical imaging etc. We present NK distribution as maximum entropy probability distribution (MEPD) satisfying two moment constraints. The main objective of this article is q-generalization of NK d...

The biosensing industry has seen exponential growth in the past decade. Impact of biosensors in the current scenario cannot be overlooked. Cardiovascular diseases (CvDs) have been recognized as one of the major causes for millions of deaths globally. This mortality can be minimized by early and accurate detection/diagnosis of CvDs with the help of...

The availability of safe drinking water in non-networked rural areas and disaster-affected zones is dependent on point-of-use water filters. This study describes the design and performance assessment of a personal portable ceramic water filter named “sip-up.” Four sample variants were made using clay, exfoliated graphite (EG), and sawdust as raw ma...

Owing to their attractive energy density of about 8.1 kW h kg⁻¹ and specific capacity of about 2.9 A h g⁻¹, aluminum–air (Al–air) batteries have become the focus of research. Al–air batteries offer significant advantages in terms of high energy and power density, which can be applied in electric vehicles; however, there are limitations in their des...

Among the most sought-after chalcogenides, Hg-based diamondlike semiconductors have recently been realized for ultralow low heat conduction and potential thermoelectric devices. We present a less well-known but promising quaternary Hg-based chalcogenide, Cu2HgSnS4 (CHTS), for its electrical and thermal transport properties and compare it to its par...

We report the γ-Fe2O3 modified exfoliated graphite (γ-Fe2O3@ExGCP) flexible paper electrode as a non-enzymatic glucose sensor. The γ-Fe2O3 was physically mixed with exfoliated graphite flakes, and mechanically pressed to get a thin sheet. The amperommetric analysis of γ-Fe2O3@ExGCP electrode shows that the sensor current increases with increasing g...

With the ever-increasing demand for efficient and sustainable energy solutions, rechargeable Fe-ion batteries have emerged as a viable alternative to conventional rechargeable batteries. Rechargeable Fe-ion batteries are considered one of the most promising energy storage devices due to their low cost, abundance, eco-friendliness, and enhanced safe...

We investigated Fe3O4 nanoparticles (NPs) for a symmetric supercapacitor (SSC) under ambient conditions from synthesizing material to device fabrication. The prepared Fe3O4 NPs are characterized using different characterization, X‐ray diffraction, Raman and FTIR spectroscopy. The electrochemical performance of supercapacitor (SC) is measured in two...

Bismuth ferrite (BiFeO 3 ) multiferroic nanoparticles are synthesized using a low-temperature sol–gel auto-combustion technique.

In this manuscript, we examine the electrical behavior of pulse laser deposition grown epitaxial (111) oriented CuO thin films using impedance spectroscopy to understand the microscopic origin of their relaxor-like characteristics. Temperature ( T ) dependent variation of the real part of dielectric permittivity ( ε ′ ) shows a relaxor ferroelectri...

In this work, we present a binder-free, direct growth of SnS2 nanoflakes on carbon cloth (CC), adopting a cost-effective, one-step hydrothermal technique as an efficient electrocatalyst for hydrogen evolution reaction (HER). The XRD spectrum confirms the phase pure SnS2 nanoflakes with crystallite size 38 \(\pm\) 2 nm. The presence of A1g peak in t...

Aluminum-Air Battery (AAB) is getting attention because of its simple structure, suitable redox potential, and most abundant aluminum metal in the earth's crust, with the expectations to meet or mitigate the energy demand. We designed a cost-effective AAB under ambient conditions, consisting of pure Al as the anode, 4M KOH as an electrolyte, and ca...

In any electrochemical energy storage system capacity fading is a crucial concern and poses challenges to their long-term stability for any practical uses. There are various characterization techniques for understanding the electrode material, yet it is difficult to nail down the microscopic regions of failure. X-ray diffraction is one of the most...

The Brown gas (HHO), i.e., hydrogen as well as oxygen, is considered as one of the assuring fuels for the future. It can be generated by renewable process such as (i) photoelectrochemical water splitting, (ii) thermochemical water splitting, (iii) electrochemical water splitting, etc., with zero carbon emission. We designed an HHO generator using d...

Supercapacitors (SCs) have drawn a considerable concentration because of their magnificent power density, extended cycle life, rapid charge/discharge rate, and with nearly negligible short–circuit problems compared to conventional batteries and capacitors. Carbon–based nanomaterials are widely used for supercapacitor electrodes because of their eno...

Global energy challenges compel us to explore alternative green energy sources to meet the rapidly depleting conventional energy sources. Hydroelectric cell is a noble invention in generating green electricity by nanopores defect modulated water dissociation processes without external power. In this work, ZnO nanostructured samples are synthesized...

Lithium-ion batteries (LIBs) are extensively explored due to their higher gravimetric/volumetric capacity and energy density. However, constraints such as higher lithium cost limited lithium resources, and associated toxic, explosive, and highly reactive characteristics with water compel to hunt for alternative rechargeable batteries as efficient e...

In this work, we demonstrate a single step hydrothermally grown nanorod shaped pristine and Vanadium (V) doped NiS on highly porous nickel foam substrate, i.e., NiS@NF and V-NiS@NF. A detailed electrochemical analysis, in terms of hydrogen evolution reaction (HER), oxygen evolution reaction (OER) and Tafel slope, suggests that V doping enhances the...

Hydrogen, the lightest element with highest gravimetric energy density, has attracted global interest as clean chemical fuel with water as the only byproduct. Hydrogen is an excellent choice to replace conventional fossil fuels due to its high calorific value and low ignition energy. Along with these, the growing consumption of energy globally has...

We review the development of a non-destructive technique based on Raman spectroscopy and microscopy for the in-situ characterization of electrode materials, mainly rechargeable Li-ion and sodium-ion batteries. It is possible to characterize the electrode materials using the extremely sensitive Raman shift and line width measurements to factors such...

We report the electrochemical performance of aluminum‐air (Al‐Air) cells for three commercially available aluminum alloys, that is, Al 1200, Al 8011, and Al 6061 together with the pure aluminum as anode. The contact angle and Tafel analysis are used to understand the surface adherence and corrosion characteristics. The respective Al‐Air coin cells...

This manuscript is reporting hydrogen adsorption uptake of PCN‐250(Fe) metal organic framework (MOF) at temperature of 300, 126K, and pressure in between 6 and 10 bar. X‐ray diffraction spectrum of PCN‐250(Fe) confirms crystalline structure, however Fourier transform infrared (FT‐IR) spectrum showing dominant bonding structure of COOH, N = N, and F...

Herein, density functional theory‐based comparative studies on cubic CsMX 3 ( M ‐: Pb, Sn, Ge; X‐: Cl, Br, I) and rhombohedral CsGeI 3 perovskites are reported. The structural stability indicator analysis shows that Ge‐based perovskites may exhibit small rhombohedral distortion led by lone pair (4) electrons on off‐centering Ge atom. The role of lo...

The highly porous and binder-free flexible paper electrodes can enhance the specific capacitance of symmetric supercapacitors (SCs) due to their large surface and effective ion diffusion pathways. We synthesized the exfoliated graphite (ExG) by the thermal exfoliation method of chemically treated graphite flakes and compressed it into a paper-like...

We investigated the structural stability, density of states (DOS), optical and electronic properties of Cs2TeX6 (X = Cl, Br, I) vacancy-ordered double perovskites (VoDPs) using first-principles calculations. These VoDPs exhibit good structural stability based on tolerance factors, the Brown equation, and the formation energy. The calculated indirec...

The enhancement in the absorbance and improvement in thermal stability are considered as important aspects for solar selective absorber coatings (SSAC) to convert solar energy effi-ciently into thermal energy. Considering...

Rechargeable iron-ion batteries (RIIBs) are considered one of the alternatives to lithium-ion batteries (LIBs) due to their high volumetric energy density and low-cost fabrication in ambient conditions. A crucial aspect...

One of the greatest alternatives to Li‐ion batteries is an Al‐air battery as it is more economically feasible and less toxic together with relatively better electrochemical performance. The design of the cell and the selection of electrode for improved electrochemical performance are the primary factors influencing the performance of the Al‐air bat...

The Quaternary Chalcogenide material Cu2ZnSn(S,Se)4 showed all the optimum material properties suitable for photovoltaic application. Yet, the current development has slowed down due to band-tailing issues and challenges to overcome. It causes the potential fluctuation for conduction band minima and valence band maxima. We introduced large ionic ra...

This work presents a large-scale surface disinfection system, which has a unique lantern arrangement of ultraviolet-C (UV-C) light (254 nm) in conjunction with nanotechnology in a protective biosafety environment. Shadow regions are best dealt in this system by the generation of hydroxyl radicals (•OH) and negative air ions at sites where UV light...

Spinel ferrite-based magnetic nanomaterials have been investigated for numerous biomedical applications, including targeted drug delivery, magnetic hyperthermia therapy (MHT), magnetic resonance imaging (MRI), and biosensors, among others. Recent studies have found that zinc ferrite-based nanomaterials are favorable candidates for cancer theranosti...

Cu2ZnSnS4 (CZTS) active material‐based resistive random‐access memory (RRAM) devices are investigated to understand the impact of three different Cu, Ag, and Al top electrodes. The dual resistance switching (RS) behaviour of spin coated CZTS on ITO/Glass is investigated up to 10² cycles. The stability of all the devices (Cu/CZTS/ITO, Ag/CZTS/ITO, a...

Electronic properties of spin polarized antiferromagnetic ACrO3 (A = La, Y) are explored with Hubbard model using density functional theory (DFT). These two isostructural systems are investigated using the different Hubbard energy and analyzed the hybridization of chromium 3d orbitals and oxygen 2p orbitals and the change in energy bandgaps against...

The pursuit of high-performance thermoelectricity has generated an endless stream of suitable materials, but those having intrinsically low thermal conductivity are highly desirable for production. Here, we demonstrated intrinsically low lattice thermal conductivity (κl) for the orthorhombic phase β−SrZrS3, a chalcogenide perovskite. The weak inter...

Electronic properties of spin polarized antiferromagnetic ACrO3 (A = La, Y) are explored with Hubbard Model using Density Functional Theory (DFT). These two isostructural systems are investigated using the different Hubbard energy and analyzed the hybridization of chromium 3d orbitals and oxygen 2p orbitals and the change in energy band gaps agains...

A two-dimensional honeycomb-structured magnet Ni2Te3O8 was synthesized, characterized, and comprehensively investigated for its intriguing physical properties. DC magnetization, specific heat, and neutron diffraction revealed a long-range commensurate antiferromagnetic ordering at TN∼35K with a propagation vector k=(100). The magnetic sublattice co...

Beyond von Neumann’s architecture, artificial neural network-based neuromorphic computing in a simple two-terminal resistive switching device is considered the future potential technology for simultaneous data processing and storage. These are also compatible with low-power consumption nanoelectronic devices and, thus, suitable for applications suc...

We demonstrated the resistive random access memory characteristics for Cu (top contact)/BFO/PMMA (active layer)/ITO (bottom electrode)/PET sheet as a flexible substrate device configuration. The device showed non-volatile bipolar resistive switching characteristics with good repeatability and the coexistence of NDR for 100 cycles or more with 0.28/...

The use of strain in semiconductors allows extensive modification of their properties. Due to their robust mechanical strength and flexibility, atomically thin 2D materials are very well suited for strain engineering to extract exotic electronic and thermophysical properties. We investigated the structural, electronic, thermal, and vibrational char...

In this manuscript, we report room‐temperature structural, microstructural, optical, dielectric, and magnetic properties of CuO and Cu0.995La0.005O ceramics, synthesized by solid‐state reaction method. La doping in CuO leads to the evolution of compact and dense microstructure with reduced porosity. Due to noticeable differences in the ionic radii...

Air pollution is one of the top 5 risks causing chronic diseases according to WHO and airborne transmitted pathogens infection is a huge challenge in the current era. Long living pathogens and small size aerosols are not effectively dealt with by the available indoor air purifiers. In this work, a dielectric barrier discharge (DBD) based portable c...

The magnetic ground state of LaCrO3 and CaCrO3 solid solution is investigated in the complete miscibility range, i.e., La1-xCaxCrO3 with 0 ≤ x ≤ 1 at the interval of x =0.25 to understand the magnetic phase transitions with Ca substitutional fraction. The density functional theory is used with Hubbard correction to account for Cr exchange interacti...

Materials with 100% spin polarisation, high-speed conduction electrons, high Curie temperatures, and ferromagnetic ground state are known for spintronics. Double perovskites (DPs) with these features are becoming popular nowadays. Herein, introducing another halide-based DP, we determined that Cs2KMnCl6 is a robust intrinsic 3d ferromagnetic half-m...

The present work investigates analytically and experimentally the multimodal performance analysis of piezoelectric (PZT-5A) based generic nanogenerators. The present nanogenerators consider both uni-morph and bimorph with offset-proof mass subjected to sinusoidal base excitation. The finite element-based multi-mode electromechanical coupled dynamic...

2D-graphitic C3N4 is used as an efficient cathode material for safer and more reliable rechargeability with non-aqueous electrolytes-based RIIBs, exhibiting potential for next-generation energy storage devices for various small/large-scale applications.

We fabricated rechargeable iron ion batteries (RIIBs) using mild steel (MS) as a negative electrode, vanadium penta oxide as a positive electrode, and ferrous perchlorate hydrate in tetra-ethylene glycol dimethyl ether (TGDME)-based solvent under ambient conditions without any inert atmosphere and investigated the performance degradation. The cell...

We report the preparation of the ZnO- ⁶ LiF composite with a polystyrene (PS) polymer as a host using the solution mixing process. ⁶ LiF acts as a converter material that absorbs a thermal neutron and produces alpha particles, which excites ZnO micro-particles, resulting in UV–vis photons’ emission. The free-standing ZnO- ⁶ LiF/PS composite film is...

Rigorous efforts are made on quarternary chalcogens, e.g., Cu2ZnSn(S/Se)4, based alloys to develop cost‐effective materials for different energy and optoelectronics devices. In this development, several cations substituted alloys are also explored, expecting better stability and avoiding unfavorable antisite defects. Here we reported the optoelectr...

The materials exhibiting the negative differential resistance (NDR) and write once read many (WORM), simultaneously are potential candidates for electronic devices such as oscillators and permanent storage devices. Here in, we investigated the impact of crystallinity on coexistence of NDR and WORM resistive switching on Cu(top contact)/BiFeO3 (amor...

The materials showing write once read many (WORM) types of resistive switching characteristics are potential candidates for permanent storage. The negative differential resistance‐based memory devices have the potential to perform like non‐linear systems together with resistive switching simultaneously. We demonstrated the successful synthesis of B...

Implementation of stealth features on advanced airborne platforms (aircrafts, unmanned air vehicles, missiles, etc.) has become a compulsion for each country, for denial/delay detection of these objects from enemy radars, during tactical missions. Apart from the shaping of the airframe, implementation of microwave-absorbing materials (MAMs) on iden...

The article reviews ionizing radiation detectors based on Zinc oxide structures such as bulk single crystal, transparent ceramics, thin film, powder, nanostructures like nanoparticles, nanorods, nanocomposites, etc. Bulk single crystal developed using pressure melt/hydrothermal method is used Scintillator/Ionization detector for alpha and pulsed x-...

The continuous real-time monitoring of glucose is essential for patients suffering from diabetes. Therefore, the low-cost and flexible glucose sensor is necessary, showing enhanced sensitivity and limit of detection. We report results of studies resulting in developing a nanostructured exfoliated graphite carbon paper (ExGCP) based efficient electr...

This article investigates the vacancy ordered Cs2SnX6 (X = Cl, Br, I) double perovskites (VODP) using jTB-mBJ XC potentials and conclusively noticed that jTB-mBJ’s refined parameters are transferable to VODPs for accurate prediction of material properties. The article presents a comparative analysis of CsMX3 perovskites. Further, a mixed Mott-Hubba...

We used thermal chemical vapour deposition to synthesize zinc oxide nanostructured thin films on n-type silicon substrate using zinc oxide (ZnO) and zinc chloride (ZnCl2) powder precursors in conjunction with bulk graphite powder. The synthesized ZnO nanostructured thin films structures are polycrystalline with a relatively enhanced c-axis orientat...

Ceramic water filters (CWFs) have been used in India due to their low expense, ease of manufacture, and livelihood sustenance features. However, the use and throw character of such systems has not been achieved. The purpose of this study is to develop and investigate the portable CWF variant named Sip-up, which can be attached to any commercially a...

The thermodynamic stability, electronic, and thermoelectric properties of TiB2 and ZrB2 are computed using density functional and Boltzmann transport theory. The phonon band dispersion of ZrB2 monolayer exhibits dynamic instability with the presence of imaginary frequency. The small direct bandgap is noticed for these monolayers. More interestingly...

A mere decade-long research focused on perovskites for photovoltaics (PVs) has unearthed their exciting promise. However, as an alternative to the inaugural class of single perovskites, which suffer from instability and toxicity, an interesting class of halide double perovskites (DPs) have recently been in the hot list of photovolatic (PV) research...

We investigated the structural, thermodynamic, and optoelectronic properties of InxAl1-xN, InxGa1-xN, and GaxAl1-xN alloys for x = 0.25, 0.50 and 0.75. The optimized lattice constants showed nearly a small deviation trend from Vegard's law with composition x. The impact of mutual alloying is evaluated in terms of enthalpy and interaction parameters...