Sandhu, Jaspreet and Chauhan, Amit Kumar Singh and -, Govind (2011) Formation of Gallium-induced nanostructures on single crystal HOPG surface. Journal of Nanoparticle Research , 13 (8). pp. 3503-3509. ISSN 1388-0764

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The room temperature growth of gallium atoms on the highly oriented pyrolytic graphite (HOPG) surface has been performed. The gallium atoms were deposited by thermal evaporation method in an ultra high vacuum system at a base pressure 5 × 10−10 torr. The X-ray photo electron spectroscopy (XPS) studies had been performed to confirm the presence of gallium atoms on HOPG surface. Scanning tunneling spectroscopy (STM) technique was employed to study the surface morphology of the clean HOPG surface and gallium covered HOPG surfaces which recognize the formation of gallium induced nanostructures. The deconvoluted XPS core level spectra of C (1s) and Ga (3d) demonstrate the possible interaction between substrate and the adsorbate atoms. The STM analysis revealed that the gallium deposition on HOPG led to significant change in the surface morphology. It was observed that the Ga atoms adsorbed as layer structure on HOPG surface for low coverage while quasi one-dimensional chain like nanostructure (1 ± 0.2 nm) has been formed for higher Ga coverage. The nanostructured surfaces induced by Ga deposition are found to be stable and could be used as a template for the growth of metallic nanostructures.

Item Type: Article
Additional Information: Copyright for this article belongs to M/s Springer Verlag.
Uncontrolled Keywords: HOPG; Gallium; XPS; STM; Surface morphology; Metallic nanostructure
Subjects: Chemistry
Materials Science
Nanoscience/ Nanotechnology
Depositing User: Mr. Abhishek Yadav
Date Deposited: 18 Dec 2012 07:12
Last Modified: 18 Dec 2012 07:12

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