A5079444187- Quantum Dots Synthesis And Properties
- Copper-based nanomaterials and applications
- MXene and MAX Phase Materials
- Chalcogenide Semiconductor Thin Films
- ZnO doping and properties
- Advanced Cellulose Research Studies
- 2D Materials and Applications
- Electrospun Nanofibers in Biomedical Applications
- Gold and Silver Nanoparticles Synthesis and Applications
- Magnetic Properties and Synthesis of Ferrites
- Graphene research and applications
- Iron oxide chemistry and applications
- Supercapacitor Materials and Fabrication
- Gas Sensing Nanomaterials and Sensors
- Dyeing and Modifying Textile Fibers
- Ga2O3 and related materials
- Magnetic and transport properties of perovskites and related materials
- Transition Metal Oxide Nanomaterials
- Diamond and Carbon-based Materials Research
- Electron and X-Ray Spectroscopy Techniques
- Silicon Nanostructures and Photoluminescence
- Characterization and Applications of Magnetic Nanoparticles
- Extracellular vesicles in disease
- Magnetic Properties and Applications
- Advanced biosensing and bioanalysis techniques
Indian Institute of Science Education and Research Berhampur
2017-2024
Stockholm University
2012-2019
Wallenberg Wood Science Center
2012-2019
KTH Royal Institute of Technology
2012-2019
Tamkang University
2013-2015
Savitribai Phule Pune University
2008-2012
Indian Institute of Science Education and Research Pune
2009-2012
Indian Institute of Technology Kharagpur
2012
UGC DAE Consortium for Scientific Research
2009
High coercivity (9.47 kOe) has been obtained for oleic acid capped chemically synthesized CoFe(2)O(4) nanoparticles of crystallite size approximately 20 nm. X-ray diffraction analysis confirms the formation spinel phase in these nanoparticles. Thermal annealing at various temperatures increases particle and ultimately shows bulk like properties 56 The nature bonding with amount sample is determined by Fourier transform infrared spectroscopy thermogrvimetric analysis, respectively. Raman...
We report template-free, microwave-irradiation-assisted growth of ZnS nanorods. Using this facile and high yield technique we could grow nanostructures approximately 50–100 nm diameter more than 1 µm in length. Effects microwave power irradiation time on the process were investigated. It was revealed that refluxing plays a vital role determining thickness rods. This simple using multimode source may prove to be potential tool for growing similar other oxide-, sulfide- selenide-based compound...
Efforts have been made to elucidate the origin of d(0) magnetism in ZnO nanocactuses (NCs) and nanowires (NWs) using X-ray-based microscopic spectroscopic techniques. The photoluminescence O K-edge Zn L3,2-edge X-ray-excited optical luminescence spectra showed that NCs contain more defects than NWs do NCs, are present at sites sites. Specifically, results scanning transmission X-ray microscopy (STXM) corresponding X-ray-absorption near-edge structure (XANES) spectroscopy demonstrated...
Chemically synthesized, thiol capped undoped, and Fe doped CdSe nanoparticles (NPs) have been investigated using a variety of physicochemical techniques. The electron spin resonance spectra exhibit two distinct signals at $g\ensuremath{\sim}4$ $g\ensuremath{\sim}2$ characteristic ${\text{Fe}}^{3+}$ ions occupying highly asymmetric nearly symmetric lattice sites, respectively. room temperature M\"ossbauer studies show broad doublet with isomer shift $\ensuremath{\sim}0.35\text{...
Abstract The correlation between sub-band gap absorption and the chemical states electronic atomic structures of S-hyperdoped Si have been extensively studied, using synchrotron-based x-ray photoelectron spectroscopy (XPS), near-edge (XANES), extended fine structure (EXAFS), valence-band photoemission (VB-PES) first-principles calculation. S 2 p XPS spectra reveal that with greatest (~87%) contains highest concentration 2− (monosulfide) species. Annealing reduces absorptance species, but...
Abstract This investigation studies the various magnetic behaviors of graphene oxide (GO) and reduced oxides (rGOs) elucidates relationship between chemical states that involve defects therein their in GO sheets. Magnetic hysteresis loop reveals is ferromagnetic whereas photo-thermal moderately (M-rGO) heavily (H-rGO) gradually become paramagnetic behavior at room temperature. Scanning transmission X-ray microscopy corresponding absorption near-edge structure spectroscopy were utilized to...
In the present work, vanadium carbide (V2CTx) MXene was synthesized successfully and then treated with an ammonia solution (NH4OH) under different pressures using a hydrothermal process. The sample morphology reveals that V2CTx gradually changed from uneven multilayered micrometre-size sheets to uniform few-layered nanometer-size as pressure increased. optical emission spectra show broad blue shift due nitrogen-related defects quantum confinement. X-ray photoelectron spectroscopy shows...
In this study, we introduce a synergistic approach to enhance the surface-enhanced Raman scattering (SERS) signal in two-dimensional (2D) MXene through photo-irradiation and electric field modulation. Our methodology involves integration of 2D Ti3C2Tx with piezoelectric polyvinylidene fluoride (PVDF) polymer, resulting creation free-standing, flexible composite film. On film, thin layer Au was deposited. substrate able sense methylene blue (MB), crystal violet (CV), 4-aminothiophenol (ATP),...
The in-situ X-ray absorption spectroscopy of three tungsten oxide films was performed to study the electronic and atomic structures following repeated cycles coloration bleaching processes. transparent become deep blue upon intercalation Li+ ions in WO6 octahedra when an external electrical bias applied. These reverted a reverse W L3-edge near-edge structure (XANES) measurements nanocrystalline crystalline revealed that intensity white-line feature decreases after recoverably increases owing...
Abstract A new family of two‐dimensional (2D) materials called MXenes has gained attention recently owing to their fascinating physical and chemical properties. Herein, 2D vanadium carbide (V 2 C) MXene was mixed with cellulose nanocrystals (CNCs) produce an environmentally friendly V C/CNC composite. The composite exhibited surface‐enhanced Raman scattering (SERS) activity for the methylene blue (MB) dye enhancement factor ~9 × 10 5 . Here, we have proposed that along electromagnetic...
The microfluidic approach emerges as a new and promising technology for the synthesis of nanomaterials. A microreactor allows variety reaction conditions to be quickly scanned without consuming large amounts raw material. In this study, we investigated water soluble 1-thioglycerol-capped Mn-doped ZnS nanocrystalline semiconductor nanoparticles (TG-capped ZnS:Mn) via approach. This is first report successful doping Mn in at room temperature well 80 °C using microreactor. Transmission electron...
Zn1-xNixFe2O4 nanoparticles were prepared with varying Ni concentration via sol-gel method. The magnetostrictive strains of sintered measured using an indigenous optical cantilever beam magnetometer. four regimes in variation the have been observed: (i) zero strain range, 0% to 25% Ni; (ii) positive (tensile) a slow gradient 50% (iii) negative (compressive) fast between and 75% (iv) maximum 100% concentrations. observed magnetostriction is correlated structure characterized by x-ray...
The oxygen evolution reaction (OER) plays a key role in various energy applications, and perovskite oxides have received significant interest recent years as potential catalysts for the OER. Furthermore, magnetic field-enhanced electrocatalysis has emerged recently promising way to boost catalytic efficiency materials. In present work, YMnCrO3 oxide nanostructures were synthesized, their properties are altered by Cr doping YMn1–xCrxO3 (x = 0, 0.05, 0.1). hysteresis loop confirms enhanced...
Inspired by the Bogolanfini dyeing technique, we report how flexible nanofibrillated cellulose (CNF) films can be functionalized and patterned surface-bound nanoparticles of hydrolyzable tannins multivalent metal ions with tunable colors. Molecular dynamics simulations show that gallic acid (GA) ellagic (EA) rapidly adsorb assemble on CNF surface, atomic force microscopy confirms nanosized GA assemblies cover surface CNF. were tannin-metal ion an in-fibre reaction between pre-impregnated...
We report herein the synthesis of WO3 nanostructures and their various physicochemical electrochemical properties. X-ray diffraction Raman investigations indicate that as-synthesized materials crystallize into orthorhombic (o-WO3) monoclinic (m-WO3) phase depending upon procedure annealing temperature. Further, a transition was observed from o-WO3 to m-WO3 after at 500 oC. The results is more stable higher temperature compared phase. More interestingly, nearly 0.4 eV band gap tuning by...
We have investigated the chemistry of Bogolan or mud cloth dyeing process, a traditional technique coloring cotton cloths deeply rooted in Mali. Textiles produced by using tannin-rich plant extract and iron-rich clay-based mud, were compared infrared (IR) spectroscopy, scanning electron microscopy (SEM) X-ray absorption near-edge spectroscopy (XANES) with fibers that impregnated tannin iron salt solutions. IR both reflective mode on transmission single fibers, together SEM, showed gallic...
Abstract In this work influence of silver (Ag) nanoparticles (NPs) on cellulose nanofibers (CNF) was investigated. Free standing composite films CNF/ polyvinylalcohol (PVA) ‐ Ag NPs have been synthesized by ex‐situ method. Composite with different content (1%, 10% and 20%) were obtained characterized various techniques such as UV‐visible absorption spectroscopy, field emission scanning electron microscopy (FESEM), Infrared (IR) spectroscopy Thermo gravimetric analysis (TGA). A UV‐vis study...
Abstract We have used simple chemical route to synthesize delafossite silver ferrite (AgFeO 2 ) nanoparticles (NPs). AgFeO NPs were utilized as Raman substrate for detection of Rhodamine 6G (R6G) molecules. show excellent Surface‐enhanced Scattering (SERS) activity, which enables ultrasensitive R6G with a concentration down 1 picomolar (1 pM) an enhancement factor (EF) 1.6×10 10 . The observed SERS signal in this system is attributed combination electromagnetic (EM) enhancement, charge ‐...
Abstract In the present exploration, MXene (Ti 3 C 2 T x ) based composite polymer electrolytes (CPEs) are fabricated by electrospinning technique to make free‐standing fiber films. this process, four different synthesized varying content from 0 mg 60 in poly‐acrylonitrile (PAN) along with NaPF 6 solution. The electron microscopic studies reveal layered morphology of samples. Further, CPE fibers exhibit lengths several micro‐meters widths < μm. linear sweep voltammetry results manifest...