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Yong, Hyeondeuk,Kim, Kiyeol,Choi, Wooseok,Park, Joonkyu,Ahmad, Muneer,Seo, Yongho Elsevier 2012 Carbon Vol.50 No.12
<P><B>Abstract</B></P><P>A graphene cellular array on an insulating SiO<SUB>2</SUB> layer was fabricated by scanning probe lithography. The graphene layer was oxidized by an electric field which was applied between the cantilever tip and Si substrate without any electrode directly connected to the graphene layer. When the bias voltage was applied on a cell of patterned graphene through the cantilever tip, charge was accumulated on the cell and preserved for a long time without decay. The accumulated charge and the surface potential were measured by an electrostatic force microscope. The charge retention was measured as a function of time, and the decay time constant was estimated to be ∼70min.</P>
Application of Scanning Probe Lithography to Graphite Patterning
Yong, Hyeondeuk,Lee, Hyunsoo,Kim, K. B.,Lee, N. S.,Seo, Yongho American Scientific Publishers 2011 Journal of Nanoscience and Nanotechnology Vol.11 No.2
<P>We applied the scanning probe lithographic technique to a graphite patterning in air and analyzed the patterned sample with the lateral force microscopy and Raman spectroscopy. The local electric field generated from a tip caused either etching or oxidization depending on the electric field intensity in air. We have found that the frictional force between the tip and local oxidized graphite surface was increased remarkably from lateral force analysis. Also, it was found that the graphene layer was peeled from the graphite surface in the etching process, which could be a potential tool as a top-down nano-fabrication process for the graphene nano device without contamination.</P>