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TU Dresden » Faculty of Mechanical Science and Engineering » Institute for Materials Science » Chair of Materials Science and Nanotechnology

Thursday, 24 June 2010
(at 13:00 in room 115, Hallwachsstr. 3)
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Nondestructive Evaluation of Defects and Defect Engineering in Carbon Nanotubes

Pravat Kumar Giri

Department of Physics and Centre for Nanotechnology
Indian Institute of Technology Guwahati

Since their discovery, carbon nanotubes (CNTs) have fascinated the scientist, engineers and entrepreneurs in an unprecedented way. Once thought to be a perfect tubular structure, the nanotubes are far from being perfect in reality. However, nondestructive evaluation of defects in CNTs has remained a great challenge. In this talk, I will give an overview of our recent findings on the diameter dependent properties of single walled and multiwalled carbon nanotubes with special emphasis on spectroscopic signature of defects, defect engineering and some aspects of applications of defects in CNTs with wide range of diameters (1-100 nm). Microscopic and spectroscopic evaluations of defects have been carried out using several complimentary techniques. In particular, use of Raman, fluorescence, electron spin resonance, thermogravimetry, X-ray photoelectron spectroscopy will be demonstrated to understand the nature and role of defects in CNTs structures and its stability. Controlled introduction of defects and engineering the structure of CNTs by ion irradiation will also be shown. Finally, the role of defects in the fluorescence quenching of several fluorescent dyes by CNTs will be presented. Implications of these results will be discussed for futuristic applications of defects in CNTs.

Brief Bio:

Dr. P K Giri obtained his PhD from Indian Institute of Technology, Kanpur in 1997 and then he moved to Italy for a postdoc in CNR-IMM, Catania and worked there till July 1999. In August 1999, he joined Indira Gandhi Centre for Atomic Research, Kalpakkam, India as a Scientific Officer. Later, he joined Indian Institute of Technology, Guwahati as an Assistant Professor of Physics in 2001 and presently he is an Associate Professor of Physics and Centre for Nanotechnology at IIT Guwahati. His research interests are Semiconductor Nanostrctures, Carbon nanotubes, Defect engineering, dilute magnetic semiconductors etc.

Invited by G. Cuniberti

last modified: 2021.10.21 Thu
author: webadmin