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Open Access Nano Express

Revelation of graphene-Au for direct write deposition and characterization

Shweta Bhandari1, Melepurath Deepa2, Amish G Joshi1, Aditya P Saxena1 and Avanish K Srivastava1*

Author Affiliations

1 National Physical Laboratory, Council of Scientific and Industrial Research, Dr. K.S. Krishnan Road, New Delhi, 110 012, India

2 Department of Chemistry, Indian Institute of Technology Hyderabad, Hyderabad, 502205, India

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Nanoscale Research Letters 2011, 6:424  doi:10.1186/1556-276X-6-424

Published: 15 June 2011

Abstract

Graphene nanosheets were prepared using a modified Hummer's method, and Au-graphene nanocomposites were fabricated by in situ reduction of a gold salt. The as-produced graphene was characterized by X-ray photoelectron spectroscopy, ultraviolet-visible spectroscopy, scanning electron microscopy, and high-resolution transmission electron microscopy (HR-TEM). In particular, the HR-TEM demonstrated the layered crystallites of graphene with fringe spacing of about 0.32 nm in individual sheets and the ultrafine facetted structure of about 20 to 50 nm of Au particles in graphene composite. Scanning helium ion microscopy (HIM) technique was employed to demonstrate direct write deposition on graphene by lettering with gaps down to 7 nm within the chamber of the microscope. Bare graphene and graphene-gold nanocomposites were further characterized in terms of their composition and optical and electrical properties.