130 citations · 626 across the 19 of their papers we have counts for
17 papers · 1 filter
Localized tip enhanced Raman spectroscopic study of impurity incorporated single GaN nanowire in the sub-diffraction limit
A. Patsha, S. Dhara, A. K. Tyagi
The localized effect of impurities in single GaN nanowires in the sub-diffraction limit is reported using the study of lattice vibrational modes in the evanescent field of Au nanop…
Nonpolar p-GaN/n-Si heterojunction diode characteristics: A comparison between ensemble and single nanowire devices
Avinash Patsha, Ramanathaswamy Pandian, Sandip Dhara +1
The electrical and photodiode characteristics of ensemble and single p-GaN nanowire and n-Si heterojunction devices were studied. Ideality factor of the single nanowire p-GaN/n-Si…
Carrier mediated reduction of stiffness in nanoindented crystalline Si(100)
S. Kataria, Sandip Dhara, S. Dash +1
We report the observation of carrier mediated decrease in the stiffness of crystalline (c)-Si(100) under nanoindentation. The apparent elastic modulii of heavily dopes (1E21 cm-3)…
XPS studies on AlN thin films grown by ion beam sputtering in reactive assistance of N+/N2+ ions: Substrate temperature induced compositional variations
Neha Sharma, S. Ilango, S. Dash +1
We report on an XPS study of AlN thin films grown on Si(100) substrates by ion beam sputter deposition (IBSD) in reactive assistance of N+/N2+ ions to unravel the compositional var…
Invoking forbidden modes in SnO_2 nanoparticles using tip enhanced Raman spectroscopy
Venkataramana Bonu, A. Das, A. K. Sivadasan +2
Raman forbidden modes and surface defect related Raman features in SnO_2 nanostructures carry information about disorder and surface defects which strongly influence important tech…
Surface functionalization enhanced magnetism in SnO_2 nanoparticles and its correlation to photoluminescence properties
Venkataramana Bonu, Arindam Das, Manas Sardar +2
High value of magnetic moment 0.08 emu/g at room temperature for SnO_2 nanoparticles (NPs) was observed. Surface functionalization with octadecyltrichlorosilane (OTS) enhanced the…
Photoluminescence of oxygen vacancies and hydroxyl group surface functionalized SnO_2 nanoparticles
Venkataramana Bonu, Arindam Das, S. Amirthapandian +2
We report, for the first time, the luminescence property of the hydroxyl group surface functionalized quantum dots (QDs) and nanoparticles (NPs) of SnO_2 using low energy excitatio…
Mass spectral analysis and quantification of Secondary Ion Mass Spectrometry data
A. K. Balamurugan, S. Dash, A. K. Tyagi
This work highlights the possibility of improving the quantification aspect of Cs-complex ions in SIMS (Secondary Ion Mass Spectrometry), by combining the intensities of all possib…
Growth Kinetics of Ion Beam Sputtered Al-thin films by Dynamic Scaling Theory
Neha Sharma, K. Prabakar, S. Dash +1
This paper reports the study of growth kinetics of ion beam sputtered aluminum thin films. Dynamic scaling theory was used to derive the kinetics from AFM measurements. AFM imaging…
Growth Kinetic studies of ion beam sputtered AlN-thin films: Effect of reactive assistance of nitrogen plasma
Neha Sharma, K. Prabhakar, S. Ilango +2
Reactive dual ion beam sputter deposition of AlN thin films was carried out for the analysis of surface growth characteristics by Atomic Force Microscopy. The variation of roughnes…
Evolution and defect analysis of vertical graphene nanosheets
Subrata Ghosh, K. Ganesan, Shyamal R. Polaki +4
We report catalyst-free direct synthesis of vertical graphene nanosheets (VGNs) on SiO2/Si and quartz substrates using microwave electron cyclotron resonance - plasma enhanced chem…
Phonons and Thermodynamics of LiMPO4 (M=Mn, Fe)
Prabhatasree Goel, M. K. Gupta, R. Mittal +5
Lithium transition metal phospho-olivines are useful electrode materials, owing to their stability, high safety, low cost and cyclability. We report phonon studies using neutron in…
Optical properties and hardness of highly a-axis oriented AlN films
Feby Jose, R. Ramaseshan, S. Tripura Sundari +4
This paper reports optical and nanomechanical properties of seldom studied highly a-axis oriented AlN thin films for the first time. These films were deposited by reactive DC magne…
Face-centered-cubic titanium in Ti/Al multilayer thin films synthesized by magnetron sputtering technique
Ramaseshan Rajagopalan, Arup Dasgupta, Ramachandran Divakar +6
Ti/Al multilayer thin films with precise thickness have been deposited using a combination of dc and rf magnetron sputtering techniques. Cross-sectional transmission electron micro…
Multi-phonon Raman scattering in GaN nanowires
S. Dhara, Sharat Chandra, G. Mangamma +9
UV Raman scattering studies show longitudinal optical (LO) mode up to 4th order in wurtzite GaN nanowire system. Frohlich interaction of electron with the long range electrostatic…
Detecting onset of chain scission and crosslinking of gamma-ray irradiated elastomer surfaces using frictional force microscopy
S. Banerjee, N. K. Sinha, N. Gayathri +4
We report here that atomic force microscope (AFM) in frictional force mode can be used to detect onset of chain scission and crosslinking in polymeric and macromolecular samples up…
Mapping of surface local elastic constant using Atomic Force Acoustic Microscopy
S. Banerjee, N. Gayathri, S. R. Shannigrahi +3
We report a systematic study to determine local elastic properties of surfaces combining atomic force microscope (AFM) with acoustic waves which is known as atomic force acoustic m…