Pramod Borse

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Effect of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">Mn</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>concentration in ZnS nanoparticles on photo...

Physical review, Sep 15, 1999

Organically capped zinc sulfide nanoparticles doped with different manganese concentrations were ... more Organically capped zinc sulfide nanoparticles doped with different manganese concentrations were prepared under similar conditions. Only the doping concentration was varied. Photoluminescence and electron-spin-resonance (ESR) investigations show some new results. At an optimum concentration of Mn doping a maximum in the photoluminescence is reached, whereas photoluminescence quenching occurs at higher concentrations. ESR investigations show that the spectra arise due to

Nanoparticles of II — VI Semiconductors

Frontiers in Materials Modelling and Design, 1998

ABSTRACT

Structure and Stability of Monodisperse 1.4-nm ZnS Particles Stabilized by Mercaptoethanol

Langmuir, 2000

Extremely small 1.4-nm size mercaptoethanol-stabilized ZnS clusters have been synthesized with na... more Extremely small 1.4-nm size mercaptoethanol-stabilized ZnS clusters have been synthesized with narrow size distribution. The structure of these clusters was studied by wide-angle X-ray scattering. The scattering curves were compared with the calculated scattered intensity of a variety of model clusters (ZnS)(N) and different defect types via Debye functions. In the as-received state the pattern is best described by a

Effect of pH on photoluminescence enhancement in Pb-doped ZnS nanoparticles

Journal of Colloid and Interface Science, 2006

Narrowly dispersed Pb-doped zinc sulfide nanoparticles were synthesized at room temperature using... more Narrowly dispersed Pb-doped zinc sulfide nanoparticles were synthesized at room temperature using a chemical method in which the nanoparticle surfaces were passivated using mercaptoethanol. The maximum intensity of the broad green luminescence (approximately 530 nm) from these nanoparticles was observed at an optimum dopant concentration of 0.104 Pb wt%. The emission intensity was found to depend on the synthesis pH conditions, thus yielding maximum intensity at 5.0 pH. Comparatively lower emission intensities were observed for the other pH values (2.5-9.0 pH range). This may be due to the pH-dependent Cl- (as well as Na+) incorporation into the ZnS matrix, which possibly helps in inducing required density of impurity (donor/co-activator) states in the energy gap of ZnS nanoparticles. X-ray diffraction analysis using Debye functional analysis showed that the particle size is 2.8+/-0.3 nm.

Luminescence quenching in ZnS nanoparticles due to Fe and Ni doping

Journal of Materials Science, 1999

Nanoparticles of zinc sulphide have been synthesized by a chemical method. Mercaptoethanol is use... more Nanoparticles of zinc sulphide have been synthesized by a chemical method. Mercaptoethanol is used to passivate the surface of the particles. Under certain conditions highly luminescent particles emitting blue light at ~425 nm can be synthesized. This blue light emission in nanoparticles of zinc sulphide is observed to be completely quenched when doped with iron or nickel metal ions.

Synthesis and investigations of rutile phase nanoparticles of TiO 2

Journal of Materials Science-materials in Electronics, 2002

TiO2 nanoparticles have been synthesized at room temperature using a simple chemical precipitatio... more TiO2 nanoparticles have been synthesized at room temperature using a simple chemical precipitation route. Particles were further coated with polymer. Detailed structural analysis of the particles has been carried out. Wide-angle X-ray scattering (WAXS) and transmission electron microscopy (TEM) confirm that “as-synthesized” particles as well as annealed particles are nanoparticles having pure rutile phase. Thermal annealing at 1000 °C of

Investigations on chemically capped CdS, ZnS and ZnCdS nanoparticles

Applied Surface Science, 2001

... Investigations on chemically capped CdS, ZnS and ZnCdS nanoparticles. SK Kulkarni Correspondi... more

Review—Recent Material Advances and Their Mechanistic Approaches for Room Temperature Chemiresistive Gas Sensors

Journal of The Electrochemical Society, 2021

Gas sensors have become an integral part of the industrial and domestic sector, due to the increa... more Gas sensors have become an integral part of the industrial and domestic sector, due to the increased emissions from industries, automobiles, and thereby exposure of the harmful gases like CO, NO2, SO2, CO2, NH3 etc. Metal oxide-semiconducting (MOS) chemiresistive gas sensors are the most popular commercial gas sensors available in the market. However, they need high operational temperature for activation and deactivation, which is a serious concern for sensitive combustible environments, as well as in other applications where flexibility, low power consumption, and miniaturization are desirable. Hence, gas sensors those exhibit high sensitivity and selectivity to the target gases, at room temperature are the need-of-hour in the market. This review focuses on various strategies and approaches those being employed and the challenges ahead to realize such room temperature chemiresistive gas sensing; viz: (i) 1D-nanostructuring of various conventional metals and metal oxides; (ii) Nano ...

Photocatalytic Hydrogen Production in Water-Methanol Mixture over Iron-doped CaTiO3

Bulletin of The Korean Chemical Society, Jan 20, 2011

CaTi1-xFexO3 (0 ≤ x ≤ 0.4) solid solution photocatalysts were synthesized by iron doping during t... more CaTi1-xFexO3 (0 ≤ x ≤ 0.4) solid solution photocatalysts were synthesized by iron doping during the conventional solid state reaction at 1100 o C for 5 h and characterized by ultraviolet-visible (UV-vis) absorption spectroscopy, X-ray diffraction, morphological analysis. We found that CaTi1-xFexO3 samples not only absorb UV but also the visible light photons. This is because the Fe substitution at Ti-site in CaTi1-xFexO3 lattice induces the band transition from Fe3d to the Fe3d + Ti3d hybrid orbital. The photocatalytic activity of Fe doped CaTiO3 samples for hydrogen production under UV light irradiation decreased with the increase in the Fe concentration. There exists an optimized concentration of iron in CaTiO3, which yields a maximum photocatalytic activity under visible light (λ ≥ 420 nm) photons.

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Hydrogen from Water

Effective charge separation in site-isolated Pt-nanodot deposited PbTiO3 nanotube arrays for enhanced photoelectrochemical water splitting

Applied Catalysis B-environmental, May 1, 2018

Abstract Highly uniform, self-supported PbTiO3 nanotube arrays are fabricated on a transparent co... more Abstract Highly uniform, self-supported PbTiO3 nanotube arrays are fabricated on a transparent conducting glass by an all solution-based, hard-templating procedure. A new concept of site-isolation has been realized by Pt-sol infiltration only in the internal core of deposited nanotube arrays and thus physically separating electron and hole reaction sites on inside and external surface of the nanotubes, respectively. The effective charge separation by the site-isolated Pt-nanodot deposited PbTiO3 nanotube photoanode leads to greatly enhanced photocurrent generation and H2 evolution efficiencies relative to those of the particulate-type photoanode or PbTiO3 nanotube without Pt infiltration in photoelectrochemical water splitting under visible light. The physical site isolation through nano-engineering of the material fabrication is expected to offer an effective strategy for preparation of high-efficiency photoelectrochemical devices.

Nanosheet Decorated Spherical MoS2 Electrocatalyst for Water-Splitting Applications

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Nano-configured Opto-electric Ceramic Systems for Photo-electrochemical Hydrogen Energy

Springer eBooks, 2019

Energetics of Nanocrystalline TiO 2

AGU Fall Meeting Abstracts, Dec 1, 2001

Nanosheets Decorated MoS 2 Micro Balls: Effect of 1T/2H Composition

ChemistrySelect, Oct 9, 2020

Nanosheets Decorated Micro Balls (NDMB) of MoS2 have been synthesized using hydrothermal techniqu... more Nanosheets Decorated Micro Balls (NDMB) of MoS2 have been synthesized using hydrothermal technique for their utilization in electrocatalytic hydrogen generation. A synergetic effect of 2H and 1T phase in NDMB was found to yield efficient hydrogen evolution reaction (HER) for splitting water molecules. NDMB electrode, fabricated by immobilization over transparent conductive substrate yielded lowest tafel slope of 40 mV/dec with smallest onset potential of 90 mV vs. RHE. Superior performance of NDMB for hydrogen evolution reaction can be attributed to synergy of 1T/2H composition and high electrochemical surface area of 170 cm2 as compared to the bulk MoS2.

Efficiency and stability aspects of CdS photoanode for solar hydrogen generation technology

Journal of physics, Oct 1, 2016

Photoelectrochemical (PEC) cell based technology is expected to be one of the easiest green techn... more Photoelectrochemical (PEC) cell based technology is expected to be one of the easiest green technologies to harness and to convert available solar energy into hydrogen . Among the known systems of GaAs, Si, GaP and CdS-Cadmium sulphide is one of the best suited PEC materials that display a balance between its efficiency and stability. It has capability to absorb the visible light photons (E~1.5eV -3eV), and displays the bandenergetics that suits for water-splitting reaction (H 2 OH 2 +O 2 ), that ultimately is based on the electronic and optical structure of the sulphides. However, the photo-induced dissolution of CdS in an electrolyte during its photo-illumination in PEC cell is its major drawback . Though arsenides and phosphides show higher efficiency however CdS exhibits significant stability. In contrast though TiO 2 / ZnO show good stability but CdS displays good optical response towards visible light photons as compared null response of titanate like systems. This necessitates one to identify the practical way to inhibit the photocorrosion in case of CdS photoanodes which is mainly facilitated due to interaction of photogenerated holes with CdS lattice. In past, Pt/ RuO 2 / Ru modified CdS surface were found to control the unwanted photocorrosion . Commercially, usage of such materials is un-economic option for any technological usage. The present work discusses that with advent of present day new synthetic routes how the dynamics of photo generated holes and electrons can be controlled to improve the stability and efficiency of the sulphide photoanodes, which in turn shows an an improvement in the performance and stability of the PEC cell for desirable technological applications.

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Hurdles and recent developments for CdS and chalcogenide‐based electrode in “Solar electro catalytic” hydrogen generation: A review

Electrochemical science advances, Oct 25, 2021

There are tremendous efforts to realize the idea of employing photoelectrochemical (PEC) technolo... more There are tremendous efforts to realize the idea of employing photoelectrochemical (PEC) technology for generating chemical energy from solar energy. The most important feature of this technology is to coordinate the energetics of an electrochemical reaction with the solar spectrum. So, the photoelectrochemistry of a semiconducting material plays a vital role in this arena. Exploring an efficient and stable semiconductor material for such purpose is an essential prospect. There are several sulfide selenide‐based semiconductors viz. II‐VI (Zn/Cd = S/Se) semiconductors those exhibit high potential in PEC application. Nonetheless, they suffer by certain corrosion issues, which are important to be reviewed and are discussed here. This review highlights the significant role of cadmium chalcogenides among various materials explored in this technology. CdS is the most studied system among all those with perfect band gap and band‐edge position exhibiting material, desired for photoanode in PEC cell. Next, recent progresses achieving enhancement in the performance of CdS photoanodes by doping, modifying the surface, morphology reconstruction, and engraving heterostructure is discussed in detail. The role of the nanostructured techniques, improved photo electrochemistry with redox couples, and advanced interfacial and band gap engineering is explored to overcome the lack of chemical stability of CdS. The review concludes with the bright scope of CdS as an efficient PEC material in the form of combined semiconductor systems with an optimum band gap, bandedge, and their complimentary properties rather than a single component material.

Photocatalytic hydrogen production from water–methanol mixtures using N-doped Sr2Nb2O7under visible light irradiation: effects of catalyst structure

Physical Chemistry Chemical Physics, 2005

Page 1. Photocatalytic hydrogen production from watermethanol mixtures using N-doped Sr2Nb2O7 un... more

Photoelectrochemical Ion Sensors

Springer eBooks, 2023

Comparision of Zn₂TiO₄and rutile TiO₂photocatalysts for H₂production under UV and near-visible light irradiation

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