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 Prof. P. Gangopadhyay Indira Gandhi Centre for Atomic Research, India |
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| Title: Interesting optoelectronic properties of nanoscale materials | |
| Abstract: Nanomaterials find great research interests for understanding fundamental properties of materials at reduced dimensions as well as for different extraordinary applications. In this Talk, it is planned to review a range of synthesis processes of nanomaterials, growth mechanisms and various experimental techniques to discuss interesting ubiquitous properties of materials at the nanoscale dimensions. Equilibrium (e.g., thermal annealing) and non-equilibrium (like utilizing energetic ion-beams) methods are elaborated for the processing of the nanomaterials. In the present context, Nanomaterials stand for pure metal nanoparticles, bimetallic alloy nanoparticles or composite materials of metal nanoparticles in different oxide semiconductors. Alloy metal nanoparticles, akin to pure metal nanoparticles exhibit exciting optical responses. For example, resonance frequencies of collective oscillations in bimetallic alloy nanoparticles may be tuned in a controlled manner through the variation of alloy compositions of respective metals. Interesting quantum optical responses have been observed in pure noble metal particles in the quantum size limit (size of particles ~2 nm). Nanoscale noble metal particles in semiconductors are also discussed to elucidate examples of fundamental interactions among the surface-plasmons and quasi-particles in the composites as well as interesting electronic properties of the nanomaterials. Thermal stability of the compound semiconductors and growth of the metal nanoparticles in the composites are found to play crucial roles and govern the basic mechanism in this regard. Depending on the growth of metal particles, for instance, photoluminescence intensity of the proximate semiconductors is observed to be enhanced or quenched in the metal-semiconductor composite materials. | |
| Biography: Dr. Parthasarathi Gangopadhyay is working as a scientist in a Government Research Institute, India. After the Master of Science (M Sc)in Physics from the Calcutta University (Kolkata, India), he was inducted into the prestigious Orientation Course of the Training School at Bhabha Atomic Research Center (BARC), Mumbai. After one year of successful research training and post-M Sc courses at BARC during 1989, he chose to carry forward his research career with Materials Science Group of Indira Gandhi Centre for Atomic Research (IGCAR),Chennai. He received the Ph D (Physics)from University of Madras, Chennai. He has been pursuing and guiding materials science and experimental physics research programs for more than two decades in the field encompassing a variety of systems, from the science of Nanomaterials to Effects of ion-beams in bulk materials. As the materials scientist, he has expertise in the field of Optical processes, Raman/photoluminescence properties of materials, Equilibrium and non-equilibrium processing of materials/metamaterials, Ion-beam modifications, Time-resolved spectroscopy, Characterization of nanomaterials etc. His research works are published by peer-reviewed scientific journals like, Phys. Rev. Lett. (APS Publications), Appl. Phys. Lett. (AIP Publications), Chem. Phys. Lett. (Elsevier Publications), CRC Press (Taylor & Francis Group), NanoWorld (USG Publications) and other publishing houses, worldwide. These articles have been receiving significant citations in reputed national and international scientific journals. He is an active member of the International Association of Advanced Materials, Indian Physics Association and the ResearchGate, Germany. Presently, Dr. Parthasarathi Gangopadhyay is leading the research group as Head, Ion Beam Physics Laboratory of Materials Science Group at IGCAR. He has been in the forefront and strongly involved, for example, in setting up investigatory laboratories for: i) ion beam induced luminescence spectroscopy experiments characterizing defects in semiconductors & insulators, ii) experimental facilities with high energy beam lines of the Medical Cyclotron in Kolkata to carry out various experiments related to defects in materials and ion-irradiation induced degradation of metals under the extreme ion beam conditions. At present, Dr. Parthasarathi Gangopadhyay lives in Chennai, very close to Mamallapuram beach(tourist place). He would appreciate to be in touch with people and the community through the mail (pgangopadhyay@gmail.com). | |
