A5031065411- Ion-surface interactions and analysis
- Diamond and Carbon-based Materials Research
- Magnetic properties of thin films
- Gold and Silver Nanoparticles Synthesis and Applications
- X-ray Spectroscopy and Fluorescence Analysis
- Integrated Circuits and Semiconductor Failure Analysis
- Theoretical and Computational Physics
- Organic Electronics and Photovoltaics
- ZnO doping and properties
- Copper-based nanomaterials and applications
- Carbon Nanotubes in Composites
- Quantum Dots Synthesis And Properties
- Microstructure and mechanical properties
- Conducting polymers and applications
- Graphene research and applications
- Nanocluster Synthesis and Applications
- Metallic Glasses and Amorphous Alloys
- Electron and X-Ray Spectroscopy Techniques
- Block Copolymer Self-Assembly
- Pickering emulsions and particle stabilization
- Thin-Film Transistor Technologies
- Ga2O3 and related materials
- Advanced Thermoelectric Materials and Devices
- Silicon Carbide Semiconductor Technologies
- Optical Coatings and Gratings
Deutsches Elektronen-Synchrotron DESY
2014-2025
University of Petroleum and Energy Studies
2023-2025
Indian Institute of Science Bangalore
2019-2020
UGC DAE Consortium for Scientific Research
2015
The fabrication of substrates for Surface Enhanced Raman Scattering (SERS) applications matching the needs high sensitive and reproducible sensors remains a major scientific technological issue. We correlate morphological parameters silver (Ag) nanostructured thin films prepared by sputter deposition on flat silicon (Si) with their SERS activity. A maximum enhancement signal has been found at Ag percolation threshold, leading to detection thiophenol, non-resonant probe, concentrations as low...
Tailoring the optical and electronic properties of nanostructured polymer–metal composites demonstrates great potential for efficient fabrication modern organic devices such as flexible sensors, transistors, diodes, or photovoltaics. Self-assembled nanocomposites offer an excellent perspective creating hierarchical nanostructures on macroscopic scales by simple bottom-up processes. We investigate growth processes nanogranular silver (Ag) layers diblock copolymer thin film templates during...
Abstract Understanding magnetic domain wall (DW) dynamics is vital for improving the performance of heavy metal/ferromagnet based spintronic devices. Pd/Co/Pd multilayers hosting perpendicular anisotropy and interfacial Dzyaloshinskii‐Moriya interaction are prototypes high density memory This work presents creep regime DW in trilayers with Ta buffer layer excited by symmetric field‐induced motion using Kerr microscopy. A systematic increment velocity increasing Co thickness observed....
Biobased cellulose nanofibrils (CNFs) constitute important building blocks for biomimetic, nanostructured materials, and considerable potential exists in their hybridization with tailorable polymeric nanoparticles. CNFs naturally assemble into oriented, fibrillar structures cross-section. This work shows that nanoparticle additives have the to increase or decrease orientation of these structures, which allows control bulk mechanical properties. Small amounts (<1 wt%) are shown promote...
The growing interest in gel-based additive manufacturing, also known as three-dimensional (3D) gel-printing technology, for research underscores the crucial need to develop robust biobased materials with excellent printing quality and reproducibility. main focus of this study is prepare characterize some composite gels obtained a low-molecular-weight gelling (LMWG) peptide called Fmoc-diphenylalanine (Fmoc-FF) two types cellulose nanofibrils (CNFs). so-called Fmoc-FF has ability...
Fabrication of nanoparticle arrays on a substrate is one the most concerned aspects for manipulating assembly nanoparticles and preparing functional nanocomposites. Here, we studied in situ kinetics polystyrene nanocolloids by using grazing incidence small-angle X-ray scattering. The structure formation film monitored during air-brush spraying, which provides rapid scalable preparation. By optimizing temperature, dispersion can be tailored to prepare monolayer film. success preparations...
The magnetic proximity effect in top and bottom Pt layers induced by Co Ta/Pt/Co/Pt multilayers has been studied interface sensitive, element specific x-ray resonant reflectivity. asymmetry ratio for circularly polarized x-rays of left right helicity measured at the $L_3$ absorption edge (11567 eV) with an in-plane field ($\pm158$ mT) to verify its origin. proximity-induced moment layer decreases thickness Ta buffer layer. Grazing incidence diffraction carried out show that induces growth...
Carbon nanotube "forests" show great promise in a variety of applications, from supercapacitors to fuel cells, but the realization such materials for functional devices relies on better control over processing routes that targeted structures and associated properties can be reproducibly obtained. The orientation distribution nanotubes is critical structural property affecting both electrical mechanical response, yet it remains challenging characteristic quantify. Small-angle X-ray scattering...
Abstract Solvent additives enable the efficient modification of morphology to improve power conversion efficiency (PCE) organic solar cells. However, impact solvent additive selectivity on film and formation kinetics is still unclarified. Herein, this work investigates two additives, 1‐chloronaphthalene (1‐CN) tetralin, characterized by their varying for polymer donor (PBDB‐T‐2F) non‐fullerene small molecule acceptor (BTP‐C3‐4F). Specifically, 1‐CN exhibits superior solubility BTP‐C3‐4F over...
The progress of organic electronics demands an increased participation nanotechnology, and it has already been shown that the presence metallic nanoparticles and/or nanostructured thin films can enhance device performance. Nevertheless, to gain control over final performance, is crucial achieve a profound understanding nanostructure development assembly. We investigate growth kinetics silver (Ag) on tris(8-hydroxyquinolinato)aluminum (Alq3) film via sputter deposition. increase average...
A detailed mechanism of the nanoripple pattern formation on Si substrates generated by simultaneous incorporation pure Fe impurities at low energy (1 keV) ion beam erosion has been studied. To understand and clarify formation, a comparative analysis samples prepared for various fluence values using two complimentary methods nanostructure analysis, atomic force microscopy, grazing incidence small angle x-ray scattering done. We observed that phase separation metal silicide formed during does...
In this work the investigation of in-plane uniaxial magnetic anisotropy induced by morphology due to ion beam erosion Si(1 0 0) has been done. Ion at an oblique angle incidence generates a well-ordered nanoripple structure on Si surface and ripple propagates in direction normal erosion. Permalloy thin films grown such periodic nanopatterns show strong with easy axis magnetization wave vector. The strength is found be high for low value wavelength; it decreasing increasing wavelength....
We report synchrotron-based small-angle X-ray scattering experiments on a template-grown porous silica matrix (Santa Barbara Amorphous-15) upon in situ sorption of fluorinated pentane C5F12 along with volumetric gas isotherm measurements. Within the mean-field model Saam and Cole for vapor condensation cylindrical pores, nitrogen is well described by bimodal pore radius distribution dominated meso- micropores 3.4 1.6 nm mean radius, respectively. In experiments, two different periodicities...
The field emission (FE) properties of nickel nanoparticles embedded in thin silica matrix irradiated with 100 MeV Au+7 ions at various fluences are studied here. A large increase FE current density is observed the films as compared to their deposited counterpart. dependence on irradiation fluence correlated surface roughness, states valence band and size distribution examined atomic force microscope, X-ray photoelectron spectroscopy, grazing incidence small angle x-ray scattering. high 0.48...
Titanium dioxide (TiO2) shows significant potential as a self-cleaning material to inactivate severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) and prevent virus transmission. This study provides insights into the impact of UV-A light on photocatalytic inactivation adsorbed SARS-CoV-2 virus-like particles (VLPs) TiO2 surface at molecular atomic levels. X-ray photoelectron spectroscopy, combined with density functional theory calculations, reveals that spike proteins can adsorb...
The compositional profile and local atomic structure in a Co40Fe40B20 thin film sandwiched between two W layers, have been probed combining time-of-flight secondary ion mass spectrometry (ToF-SIMS) x-ray absorption fine spectroscopy techniques standing wave geometry (SW-XAFS). data analysis demonstrated inhomogeneities the composition as well around transition metals, along thickness. Boron concentration shows gradual increase from bottom to surface of quantitative Fe Co K edges SW-XAFS...
Electronic excitation mediated energy loss by 120 MeV Au9+ swift heavy ions (SHIs) results in significant structural modifications of FeCo nanoparticles embedded thin SiO2 matrix. The variations local atomic structure and particle size/shape at different irradiation fluences are probed extended x-ray absorption fine spectroscopy (EXAFS) grazing incidence small angle scattering (GISAXS). crystallinity ordering the films found to first decrease then increase with fluence. observed alterations...
Abstract The thermoelectric properties of fully sprayed thin films poly(3-hexylthiophen-2,5-diyl) (P3HT) doped with chloroauric acid are investigated for different film thicknesses. thickness increases logarithmically increasing amount deposited material on the surfaces. Both electrical conductivity and measured Seebeck coefficients show an optimal polymer layer between 275 310 nm yield a maximum power factor $$(1.77\,\pm \,0.22) \frac{\mu \text {W}}{\text {m}\cdot {K}^2}$$ <mml:math...