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...

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...

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 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...

Nanomaterial based water degradation is becoming as a promising option in comparison to conventional methods. MoO 3 nanoparticles have been used nano adsorbent for methylene blue (MB) removal from aqueous solution. Here, effect of vanadium (V) element doping on adsorption activity against MB was studied. 2%, 4%, 6% and 8% V doped were synthesized using surfactant free chemical method. All the well characterized through different analysis tools study their structural, morphological, optical...

A versatile polymer–binary solvent mixture based tweaking of gold stars enables them as excellent candidates for tunable SERS substrates.

Au nanostars are multi-branched nanoparticles with sharp tips which display enhanced plasmonic applications in SERS and nanophotonics. It has already been well documented that polyvinylpyrrolidone (PVP) dispersed DMF solvent medium act as a unique candidate for realization of this 3-D complex branched metal nanostructures even under normal conditions. Interestingly, controlled addition propanol to brings about significant changes the morphology these gold visualized through gradual blue...

Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation Manoj Verma, Abhitosh Kedia, P. Senthil Kumar; Gold-Copper alloy "nano-dumplings" with tunable compositions plasmonic properties. AIP Conference Proceedings 6 May 2016; 1728 (1): 020325. https://doi.org/10.1063/1.4946376 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers...

Abstract In the present study, gold and silver nanoparticle clusters were successfully synthesized for first time, to best of our knowledge, using an environmentally friendly green synthesis method. Both nanoparticles exhibit characteristic plasmon resonance peaks at 530 nm 420 respectively with additional higher wavelengths (620 580 silver) suggesting formation or assemblies nanoparticles. Scanning Electron Microscopy Transmission analyses reveal that are predominantly spherical, average...

Herein, quasi-spherical iron oxide nanoparticles with characteristic catalytic and antioxidant properties are synthesized using fruit peel extracts as an alternative, effective, affordable, environmentally friendly way via the green chemistry method. UV-visible spectroscopy, X-ray diffraction, Transmission electron microscopy selected area Fourier transform infrared spectroscopy Brunauer–Emmett–Teller (BET) used to analyse synthesised nanoparticles. Dynamic light scattering Zeta potential...

Anisotropic gold nanoparticles are particularly important owing to their exciting applications in plasmonics as well nanophotonics and biosensing. Herein, we have synthesized nanoplates/nanotriangles with an average side-length varying from 80 150 nm via a single step room-temperature solution-phase chemical reduction method utilizing predominantly the PVP-bromine interaction. The concentration of bromine surrounding reaction medium/environment plays role determining yield at given PVP metal...

Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation M. Boazbou Newmai, Abhitosh Kedia, Pandian Senthil Kumar; NVP encapsulated gold nanoclusters by in situ polymerization of monomer. AIP Conf. Proc. 24 April 2014; 1591 (1): 600–602. https://doi.org/10.1063/1.4872688 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote...

Renewable and alternative sources for fuel petrochemicals are to be developed meet the growing need of mankind.Methane can easily obtained from renewable which converted into gasoline olefins via methanol.This study uses zeolite catalyst (ZSM-5) its modification by different metals convert methanol hydrocarbons (MTH).Catalysts studied their performance in MTH reaction at 723K.Modified ZSM-5 catalysts characterized XRD SEM.It was found that modified give better results.

Shape controlled gold nanoparticles were synthesized using a novel one step process involving the reduction of chloroauric acid (HAuCl4.3H2O) in presence polyvinylpyrrolidone (PVP) different solvents at room temperature. PVP acts both as reducing agent well stabilizer. Shape, size and plasmon resonance as‐prepared determined TEM optical absorption measurements. Conformational changes polymer when dissolved results distinctive binding with salts, thereby initiates formation size/shape...

Modulating optical resonances in plasmonic resonators were easily achieved by virtue of their constituent composition, size as well shape.Such confinement electric field the nano-regime enhances extra-ordinarily light-matter interaction, further enabling wide range applications nanophotonics, SERS etc. Herein, we compare and contrast surface plasmon modes Au nanospheres nanostellates, visibly distinct morphologies which not only correlates exceptionally with structure-property functional...

In the present work we have utilized fruit extracts (pomegranate, jack fruit) as an alternative, effectual, low-cost and environment friendly green synthesis method to produce well-defined geometries of gold nanoparticles at room temperature (30 °C) having unique structural corelated optical property. The phytochemicals in aqueous leaf or extract acted a reducing agent stabilization is also achieved with other organic molecules. generated AuNPs were characterized by Transmission electron...