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Summer Research Fellowship Programme of India's Science Academies

GROWTH OF SILVER NANO PARTICLES ON GRAPHENE

Rakesh Chandra Das

Master of Science in Applied Physics, National Institute of Technology, Silchar, Assam 788010

Dr. Kuntala Bhattacharjee

Indian Institute of Space Science and Technology, Thiruvananthapuram 695547

Abstract

Graphene shows great potential for optoelectronic applications but suffers from rather weak interaction with light due to its single-atomic thickness. To improve this light interaction, we fabricate Ag Nano islands on monolayer graphene by simple metal deposition on top of the graphene. Here, first a monolayer of graphene was deposited onto a silicon substrate by Polymer support transfer and identified with an optical microscope and Raman Spectroscopy. We report the enhanced interaction of graphene-light for Raman transition using Localized Surface Plasmons. The enhanced interaction is realized due to the excitation of Localized surface plasmons in silver Nano islands. Two samples were prepared using a thermal vapor deposition of silver nanoparticles on graphene with different deposition time of 6 minutes and 3 minutes; 6 minute sample is annealed at 440 ºC whereas 3 minutes is at 350 ºC. The fabricated samples were investigated by Atomic Force Microscope (AFM) and Raman Spectroscope. From Raman we determined the D,G and 2D peak enhancement after deposition.

Keywords: Graphene, Silver Nano particles, Raman Spectroscopy, Localized Surface Plasmon

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