International Centre for Materials Science (ICMS): Recent submissions

Now showing items 1-20 of 71

Pd nanoparticle concentration dependent self-assembly of Pd@SiO2 nanoparticles into leaching resistant microcubes

Datta, Abheek; Sadhu, Anustup; Santra, Subhankar; Shivaprasad, S. M.; Mandal, Swadhin K.; Bhattacharyya, Sayan (Royal Society of Chemistry, 2014)

Pd NP concentration guided the self-assembly of core-shell Pd@SiO2 nanoparticles (NPs) into microcubes. The Pd NPs were stacked by molten dodecyltrimethylammonium bromide (DTAB) to create the SiO2 envelope. The microcubes ...
Surface nitridation induced AlN nano-columnar growth on c-sapphire

Shetty, Satish; Ghatak, Jay; Shivaprasad, S. M. (Pergamon-Elsevier Science Ltd, 2014)

We probe the parametric dependence of the nitridation mechanism of Al2O3 surface by radio frequency nitrogen plasma in a molecular beam epitaxy system. Our quantitative analysis by XPS and RHEED shows that the chemical ...
Spontaneous growth of InxGa1-xN nanostructures directly on c-plane sapphire by plasma assisted molecular beam epitaxy

De, Arpan; Nagaraja, K. K.; Tangi, Malleswararao; Shivaprasad, S. M. (IoP Publishing Ltd, 2014)

Effect of growth temperature on the morphology, structural and optical properties of InxGa1-xN layers grown under nitrogen-rich conditions, by plasma assisted molecular beam epitaxy, on c-plane Sapphire have been studied. ...
Nitrogen ion induced nitridation of Si(111) surface: Energy and fluence dependence

Kumar, Praveen; Kumar, Mahesh; Noetzel, R.; Shivaprasad, S. M. (Elsevier Science Sa, 2014)

We present the surface modification of Si(111) into silicon nitride by exposure to energetic N-2(+) ions. In-situ UHV experiments have been performed to optimize the energy and fluence of the N-2(+) ions to form silicon ...
Multifunctional and robust covalent organic framework-nanoparticle hybrids

Pachfule, Pradip; Panda, Manas K.; Kandambeth, Sharath; Shivaprasad, S. M.; Diaz Diaz, David; Banerjee, Rahul (Royal Society of Chemistry, 2014)

Highly dispersed Pd(0) nanoparticles were successfully immobilized into a stable, crystalline and porous covalent organic framework (COF), TpPa-1, by a solution infiltration method using NABH(4) as a reducing agent. High ...
Role of AlN intermediate layer in the morphological evolution of GaN nanorods grown on c-plane sapphire

Shetty, Satish; Ghatak, Jay; Shivaprasad, S. M. (Royal Society of Chemistry, 2014)

The difference in the evolution of dislocation mediated low-dimensional GaN nanostructures on differently pre-nitrided c-plane sapphire surfaces is demonstrated. We show that GaN growth on c-plane sapphire, after forming ...
Ion induced compositional changes and nanodroplet formation on GaN surface

Venugopal, Vinay; Upadhyaya, Kishor; Kumar, Kishore; Shivaprasad, S. M. (Elsevier Science Bv, 2014)

Low energy argon ion bombardment of different fluence onto a GaN film grown on Al2O3 (0 0 0 1) surface induces interesting compositional and morphological modifications. While atomic force microscopy (AFM) studies reveal ...
Efficient Plasmonic Dye-Sensitized Solar Cells with Fluorescent Au-Encapsulated C-Dots

Narayanan, Remya; Deepa, Melepurath; Srivastava, Avanish Kumar; Shivaprasad, S. M. (Wiley-V C H Verlag Gmbh, 2014)

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 ...
Tuning the Oxygen Release Temperature of Metal Peroxides over a Wide Range by Formation of Solid Solutions

Lingampalli, S. R.; Dileep, K.; Datta, Ranjan; Gautam, Ujjal K. (American Chemical Society, 2014)

Metal peroxides, with a labile peroxy bond, constitute a distinct class of inorganic compounds that can generate singlet oxygen species and works as versatile reagents in many important industrial processes such as in ...
Nanostructuring, carrier engineering and bond anharmonicity synergistically boost the thermoelectric performance of p-type AgSbSe2-ZnSe

Guin, Satya N.; Negi, Devendra S.; Datta, Ranjan; Biswas, Kanishka (Royal Society of Chemistry, 2014)

Thermoelectric "waste heat-to-electrical energy" generation is an efficient and attractive option for robust and environmentally friendly renewable energy production. Simultaneous tailoring of interdependent thermoelectric ...
Direct evidence of strong local ferroelectric ordering in a thermoelectric semiconductor

Aggarwal, Leena; Sekhon, Jagmeet S.; Guin, Satya N.; Arora, Ashima; Negi, Devendra S.; Datta, Ranjan; Biswas, Kanishka; Sheett, Goutam (American Institute of Physics, 2014)

It is thought that the proposed new family of multi-functional materials, namely, the ferroelectric thermoelectrics may exhibit enhanced functionalities due to the coupling of the thermoelectric parameters with ferroelectric ...
Conformational change in a urea catalyst induced by sodium cation and its effect on enantioselectivity of a Friedel-Crafts reaction

Chittoory, Arjun K.; Kumari, Gayatri; Mohapatra, Sudip; Kundu, Partha P.; Maji, Tapas K.; Narayana, Chandrabhas; Rajaram, Sridhar (Pergamon-Elsevier Science Ltd, 2014)

While developing bis-camphorsulfonyl urea as a hydrogen-bonding catalysts, we discovered that the native conformation of the catalyst is unsuitable for inducing enantioselectivity. By complexing the catalyst with weakly ...
Unusual Reactivity of Nitronates with an Aryl Alkyl Carbonate: Synthesis of alpha-Amino Esters

Reddy, Golipalli Ramana; Mukherjee, Debopreeti; Chittoory, Arjun Kumar; Rajaram, Sridhar (American Chemical Society, 2014)

The monoanions of nitroalkanes are ambident nucleophiles that react with carbonate electrophiles through the oxygen atom. Products arising from reactivity at the carbon atom will yield alpha-nitro esters, which are precursors ...
Phase separation and electronic structure of ZnS0.3O0.7 alloy thin film with and without (Ag, Li) co-doping

Dileep, K.; Datta, Ranjan (Elsevier Science Sa, 2014)

ZnS0.3O0.7 alloy thin film with and without Ag and Li co-doping are grown by pulsed laser deposition on c-plane sapphire substrate. The films are phase separated in S-rich and S-poor regions. Two and four different phases ...
Native defects affecting the Li atom distribution tune the optical emission of ZnO:Li epitaxial thin film

Sahu, R.; Dileep, K.; Loukya, B.; Datta, Ranjan (American Institute of Physics, 2014)

It is found that the oxygen vacancy (V-O) defect concentration affecting the separation between individual species in Li-Zn-Li-i complex influences the optical emission property of Li0.06Zn0.94O epitaxial thin film grown ...
Probing optical band gaps at nanoscale from tetrahedral cation vacancy defects and variation of cation ordering in NiCo2O4 epitaxial thin films

Dileep, K.; Loukya, B.; Silwal, P.; Gupta, A.; Datta, Ranjan (IoP Publishing Ltd, 2014)

High resolution electron energy loss spectroscopy (HREELS) is utilized to probe the optical band gaps at the nanoscale in epitaxial NiCo2O4 (NCO) thin films with different structural order (cation/charge). The structure ...
Probing optical band gaps at the nanoscale in NiFe2O4 and CoFe2O4 epitaxial films by high resolution electron energy loss spectroscopy

Dileep, K.; Loukya, B.; Pachauri, N.; Gupta, A.; Datta, Ranjan (American Institute of Physics, 2014)

Nanoscale optical band gap variations in epitaxial thin films of two different spinel ferrites, i. e., NiFe2O4 (NFO) and CoFe2O4 (CFO), have been investigated by spatially resolved high resolution electron energy loss ...
Crystallographic phase separation and band gap of ZnO1-xSx (x=0.1-0.3) alloy thin films grown by pulsed laser deposition

Dileep, K.; Sahu, R.; Nagaraja, K. K.; Datta, Ranjan (Elsevier Science Bv, 2014)

Crystallographic phase separation and optical properties of ZnO1-xSx (x=0.1-0.3) alloy thin films grown by pulsed laser deposition (PLD) on c-plane sapphire substrate have been investigated with and without using ZnO buffer ...
Structural and magnetic characterization of mixed valence Co(II, III)(x)Zn1-xO epitaxial thin films

Negi, D. S.; Loukya, B.; Dileep, K.; Sahu, R.; Shetty, S.; Kumar, N.; Ghatak, J.; Pachauri, N.; Gupta, A.; Datta, Ranjan (Elsevier Science Bv, 2014)

In this article, we report on the Co atom incorporation, secondary phase formation and composition dependent magnetic and optical properties of mixed valence Co(II, III)(x)Zn1-xO epitaxial thin films grown by pulsed laser ...
Deformation and strength of Ti-6Al-4V alloyed with B at cryogenic temperatures

Singh, Gaurav; Bajargan, Govind; Datta, Ranjan; Ramamurty, Upadrasta (Elsevier Science Sa, 2014)

Plastic deformation and strength of Ti-6Al-4V (Ti64) alloyed with minor additions of B at cryogenic temperatures were investigated through unnotched and notched tensile tests at 20 and 77 K Marked microstructural refinement ...

Now showing items 1-20 of 71

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