| Present: Soft Matter
and Surface Physics
Studies of low dimensional systems, mainly using grazing incidence X-ray scattering (GIXS), scanning probe microscopy (SPM), optical absorption spectroscopy (UV-Vis) and photoelectron spectroscopy (UPS-XPS) techniques, to find out the growth, morphology and electronic structures. Growth and electronic structures of organic molecule-substrate interfaces - such as ClGaPc, DNTT, etc. deposited by thermal evaporation. more... Tuning orientation and ordering of π-conjugated organic semiconductors - such as P3DDT, P3HT, etc. by spin-coating. more... by self-assembly at air-water interface. more... Tuning orientation and ordering of D-A type copolymer semiconductors - such as PDPP, etc. by spin-coating. more... Organized large array of organic capped metal nanoparticles: such
as
- Langmuir monolayer, Langmuir-Schaefer (LS), Langmuir-Blodgett (LB) films
to understand the self-assembly at air/water interface and solid substrate. more... Synthesis of nanoparticles in single-step process: such as - AuNPs, AgNPs, etc. to understand the growth and formation mechanism. more... Evaporation induced self-assembled mesostructured films
- prepared by sol-gel and spin coating techniques
to understand surfactant-mediated growth of mesoporous and nanostructured films. more... Organometallic thin films: such
as
- Langmuir monolayer, Langmuir-Blodgett (LB) films
to study interfacial structure and to predict growth mechanism. more...
- deposited by sputtering techniques to study confinement effects on structure, electrical and mechanical properties. more... to study instability driven evolution of morphology and interface. more... Cermet thin films: such as nanoparticles (Pt, Au, Ag, Cu, etc.) in ceramic (alumina, silica or titania) matrix - prepared by sputtering techniques to find out the morphology and properties of cermet thin films. more... Ripple-like patterned morphology generated on Si wafers by - ion bombardment to understand the effect of ripples on the subsurface crystalline structure. more... Open PhD projects for bright motivated students Understanding molecular assembly of conjugated molecule systems in solution and in thin film- for their use as active layers in organic devices Understanding electronic structures of organic molecule-metal interfaces - for tuning device properties In most of the organic devices, an organic semiconductor is used as an active material and metals are used as electrodes; hence, there are at least two metal-organic interfaces. Understanding the electronic structure, in general, and the energy-level alignment (ELA), in particular, of such interfaces are of prime importance as the charge injection from a metal electrode to an organic active layer strongly depends on the charge injection barrier at the metal-organic interface. Scanning tunneling microscopy and spectroscopy (STM-STS) and X-ray and ultrviolet photoelectron spectroscopy (XPS-UPS) can play important role in understanding such electronic structure. Transition metal oxide (TMO) as well as ionic glasses using unconventional network former such as
bismuth oxide and lead oxide have been prepared by rappid roller quench technique, while TMO glasses using silica matrix which have high melting points and high tendency towards phase separation have been prepared by unusual sol-gel technique. All these glasses have been well characterised using different techniques: Differential Thermal Analysis (DTA), X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), IR, UV-VIS, Raman spectroscopy, Electron Spin Resonence (ESR), Magnetic susceptibility, etc. Electrical transport measurements of these well characterised glasses have been made and analysed in the wide temperature range to find out the conduction and relaxation mechanisms. Also attampts have been made to find out the effect of unconventional glass former in the ac response and its correlation with the structure.
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