Yan Jiang and Wanlin Guo 2008 Nanotechnology 19 345302 doi:10.1088/0957-4484/19/34/345302
Convex and concave nanodots and lines induced on HOPG surfaces by AFM voltages in ambient air
Yan Jiang and Wanlin Guo
Show affiliationsConvex and concave nanodots were created on highly oriented pyrolytic graphite (HOPG) in ambient air by applying a voltage pulse between a metal-coated atomic force microscope (AFM) tip and the sample surface. Using a linear scan with a positive substrate bias, nanoscale lines were also etched on the HOPG surface. Depending on the amplitude and duration of the voltage pulse, the nanostructures are either convex or concave. The depth of the concave structure sharply increased with the amplitude and duration of the voltage pulse, while the height of the convexity stayed at a low level and varied in a small range with the voltage lower than a threshold value. Under negative substrate bias or in a vacuum, no change occurred on the HOPG surface in the experimental range. The formation of the nanostructures can be ascribed to the primary dissociative adsorption of water and oxygen in air induced by the intensive hole concentration and the subsequent defect-assisted oxidation of graphite.
- PACS
- Subjects
- Dates
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Issue 34 (27 August 2008)
Received 28 March 2008, in final form 16 June 2008
Published 15 July 2008
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Convex and concave nanodots and lines induced on HOPG surfaces by AFM voltages in ambient air
Yan Jiang and Wanlin Guo 2008 Nanotechnology 19 345302
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