A5044795429- Gold and Silver Nanoparticles Synthesis and Applications
- Plasmonic and Surface Plasmon Research
- Quantum Dots Synthesis And Properties
- Copper-based nanomaterials and applications
- Nanocluster Synthesis and Applications
- Nanomaterials for catalytic reactions
- Chalcogenide Semiconductor Thin Films
- Conducting polymers and applications
- Laser-Ablation Synthesis of Nanoparticles
- Catalytic Processes in Materials Science
- ZnO doping and properties
- Nanoparticles: synthesis and applications
- Analytical Chemistry and Sensors
- Advanced biosensing and bioanalysis techniques
- Thermal Expansion and Ionic Conductivity
- Advanced Sensor and Energy Harvesting Materials
- Photonic Crystals and Applications
- Gas Sensing Nanomaterials and Sensors
- Thin-Film Transistor Technologies
- Advanced Battery Materials and Technologies
- Nonlinear Optical Materials Studies
- Advanced Photocatalysis Techniques
- Electronic and Structural Properties of Oxides
- Luminescence Properties of Advanced Materials
- Crystal Structures and Properties
University of Delhi
2016-2025
Inter-University Accelerator Centre
2010
University of Mumbai
2010
Tata Institute of Fundamental Research
2010
Universidade de Vigo
2007
University of Hyderabad
1998-2006
Chung Yuan Christian University
2006
National Chemical Laboratory
2003-2005
Multipod Au nanoparticles (nanostars) with single crystalline tips were synthesized in extremely high yield through the reduction of HAuCl4 a concentrated solution poly(vinylpyrrolidone) (PVP) N,N-dimethylformamide (DMF), presence preformed nanoparticle seeds, but no need for external energy sources. Nanostar dispersions display well-defined optical response, which was found (through theoretical modeling) to comprise main mode confined within and secondary central body. Calculations surface...
Conformational changes in the intrinsic chemical structure of polymer poly(N-vinyl-2-pyrrolidone) (PVP) aqueous as well (in)organic solvents essentially dictates novel room temperature seedless synthetic procedure for reduction hydro-chloroauric acid (HAuCl4.3H2O) leading to formation different anisotropic size/shaped gold nanoparticles. The interaction between metal ions and PVP at given specific monomer ratio leads sequential ligand exchange, thereby simultaneously utilizing mild reducing...
Anisotropic multi-branched gold nanoparticles exhibit intense localized electromagnetic fields at their tips/edges and hence have attracted significant attention in surface enhanced Raman scattering (SERS), as well bio-sensing applications. Our quest for such complex hyper-branching nanostructures has revealed that even the addition of a simple base (like NaOH) to precursor reaction mixture enhances fine tuning/reshaping 3D star/flower-like nanostars with controlled precision right from...
In recent decades, gallium nitride (GaN) has garnered significant attention from researchers due to its diverse applications in microelectronics and optoelectronic devices. this manuscript, using infrared attenuated total reflectance (IR-ATR) spectroscopy, the surface phonon polariton (SPP) interface modes of unimplanted, N+-ion-implanted, post-annealed GaN epitaxial layers have been investigated analyzed at various doses experimentally theoretically. The position SPP mode broadening as...
Abstract In the present study, well-defined one-dimensional (1D) rod-like strontium vanadate (SrV 2 O 6 ) was prepared by simple hydrothermal method without using any other surfactants/templates. The successful formation of SrV confirmed various analytical and spectroscopic techniques. Interestingly, for first time dual role as-prepared were employed as an electrochemical sensor detection caffeic acid (CA) well visible light active photocatalyst degradation metronidazole (MNZ) antibiotic...
Differential role of PVP modified with halide ions has been meticulously studied for <italic>in situ</italic> tuning Au nanoparticle growth utilizing XRD measurements together FTIR data, thus quantifying their catalysis and SERS applications.
Recently, seed-mediated approach has been widely utilized for synthesizing monodisperse gold nanostars well-known plasmonic and sensing applications. Herein, we report a single step seedless/templateless organic synthesis procedure the complex 3D with high degree of size/shape control, involving complexation polyvinylpyrrolidone (PVP) in polar solvent N,N-dimethylformamide (DMF) their reduction AuCl4– ions along hydrochloric acid (HCl) as an effective mediator. On basis kinetic optical...
Au nanostars of different sizes and shapes prepared using a simple method their applications.
We performed cathodoluminescence (CL) spectroscopy and imaging in a high-resolution scanning electron microscope to locally selectively excite investigate the plasmonic properties of multi-branched gold nanostar on silicon substrate. This method allows us map local density optical states from with spatial resolution down few nanometers. resolve, both spectral domain, different plasmon modes associated nanostar. Finite-difference time-domain (FDTD) numerical simulations are support...
The mild reducing agent, PVP, synergistically decreases the diffusion activation energy of metal precursors, facilitating formation homogenous AuAg alloy nanohybrid system; their structure-property functional relationship and enhanced applications are duly established.
The analysis of optical properties aluminium metal nanoshell using semi-analytical and numerical approach.
Surface roughness of metal nanoparticles (NPs) is well-known to play an important role in the quantitative analysis and performance their surface-enhanced Raman scattering (SERS), but its analogous catalysis not given due credit yet. In present work, we systematically investigated this by utilizing two significantly relevant gold (Au) nanostructures, hollow star-shaped, a comprehensive manner. For catalysis, universal model reaction, reduction p-nitroaniline phenylenediamine using NaBH4, was...
The simple addition of different halide ions to the precursor polymer–solvent solution for synthesis gold nanostars drastically changes their optical properties owing blue/red shifting longitudinal surface plasmon resonance (LSPR) bands as well emergence new bands, aesthetically illustrating simultaneous size/shape tuning enhanced with intriguing self organization, confirmed from TEM measurements. Such a synchronized morphology has been very understood in terms distinct reaction kinetics...