• Research Associateship by Council of scientific and Industrial Research, New Delhi, India, October 1996-March 2000
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• JSPS Fellow, Japan, Osaka National Research Institute, Ikeda, Japan (2000-2001)

          Post-Doctoral Fellowship, Department of Chemistry, University of Tulsa, 

         Oklahama, USA (2001-2002)

         Brain-Pool visiting Scientist, School of Chemical Engineering, Chonbuk National University, 

         South Korea (2005-2006)

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• Raman Research Fellowship- Italy- Materials Science and Engineering, Polytechnique of Torino, 

• Torino, Italy. September 2012- January 2013