Sonnada Math Shivaprasad

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We demonstrate here a novel high surface area GaN nanowall network substrate with plasmonic Ag nanodroplets, that can be employed as a highly sensitive, reproducible, and charge independent SERS substrate. The uniformity of the size and distribution of the Ag droplets and the absence of linker ligands result in large near-field intensity, while the GaN(More)
In this work, polysorbate surfactants with same functional groups but with varying molecular masses (Tween-80, Tween-40 and Tween-20) in different concentrations (0.1% to 20% w/w) were used to study the effect of the length of the surfactant chain on the luminescence of the entrapped TOPO-capped CdSe nanocrystals. Various phospholipids with different(More)
A simple strategy to improve the efficiency of a ZnO-nanorod-based dye-sensitized solar cell (DSSC) by use of Au-encapsulated carbon dots (Au@C-dots) in the photoanode is presented. The localized surface plasmonic resonance of Au in the 500-550 nm range coupled with the ability of C-dots to undergo charge separation increase the energy-harvesting efficiency(More)
The performance of perovskite solar cells is strongly influenced by the composition and microstructure of the perovskite. A recent approach to improve the power conversion efficiencies utilized mixed-halide perovskites, but the halide ions and their roles were not directly studied. Unraveling their precise location in the perovskite layer is of paramount(More)
The surface topography of high index Si(5 5 12) presents a single-domain planar reconstruction that is composed of (225) and (337) regions with nanoscale widths and row like trenches and provides an unique template for the growth of nanostructures. In this study, Sb has been adsorbed on this Silicon surface to form various superstructural phases by steering(More)
The ability of a catalyst to accept or donate charge is the key to the process of catalytic reaction. However, the determination of the catalytic nature of a specimen as yet remains a great challenge. Here we report an effective yet simple method for this purpose based on the tight binding theory considerations and XPS monitoring of the evolution of valence(More)
Influence of thickness of magnesium coverage deposited at room temperature and 100 C on the atomically-clean surface Si(5 5 12)-2x1 on the electrical properties and morphology of the sample was investigated. It was established that deposition of Mg at room temperature results in formation of nanowires in the direction [-110] on silicon along narrow terraces(More)
Adsorption of Group III metal ln nanostructures on Si surfaces is an exciting field that integrates the exotic electronic properties of the nano-phase and the p-doping abilities of In. We present here the kinetics of growth of In on (7 x 7) reconstructed Si(111) surface by experiments done in ultra high vacuum in the submonolayer regime, probed in-situ by(More)
This work reports a label-free, ultrasensitive, and selective optical chemosensory system for trace level detection of selenite (SeO32-), the most toxic form of selenium, in water. The probe, i.e., carbon quantum dots (CQDs), is designed from citric acid by means of pyrolysis and is interfaced with a newly synthesized nitrogen-rich ligand to create a(More)
This study demonstrates the formation of two-dimensional GaN on GaAs (001) surface by bombardment of nitrogen ions at room temperature. In this work the ion induced nitridation of GaAs (001) surface using nitrogen ion beam of different energies (range from 250 eV to 5 keV) has been investigated using in-situ X-ray Photoelectron Spectroscopy (XPS). A Ga rich(More)