SHI induced surface modification studies of HOPG using STM
作者： A. Tripathi , S.A. Khan , M. Kumar , V. Baranwal , R. Krishna
DOI: 10.1016/J.NIMB.2005.11.152
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摘要: Abstract The highly oriented pyrolytic graphite (HOPG) samples (Grade ZYB with grain size ∼1 mm) are irradiated 150 MeV Au beam fluences varying from 1 × 1011 ions/cm2 to 2 × 1013 ions/cm2. surface topography and the I–V characteristics studied using scanning tunneling microscopy (STM) spectroscopy (STS) at Nuclear Science Centre, New Delhi. formation of hillocks is observed for ions/cm2, 1 × 1012 1 × 1013 typical diameters 6.2, 2.2 1.5 nm, respectively. No sample fluence though small craters some places observed. attributed nuclear energy loss induced collision cascades near surface. reduction in higher electronic sputtering STS studies show an increasing ohmic behavior which metallic state HOPG due irradiation increase carbon bond lengths.
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