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Temperature Dependence of Transport Anisotropy of Planar-Type Graphite Nanostructures Fabricated by Focused Ion Beam

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We report in this paper on the observation of temperature-dependent anisotropic transport behavior for planar-type nanostructures (in-plane and out-of-plane) fabricated on a thin graphite layer using a three-dimensional focused-ion-beam (FIB) etching technique. The transport characteristics were studied for several in-plane areas with sizes of 6 × 6 μm2, 6 × 4 μm2 and 6 × 2 μm2 planar-type structures/patterns and out-of-plane structures with the dimensions of 2 × 1 × 0.3 μm3. Both in-plane (ρ a ) and out-of-plane (ρ c ) resistivities are measured for these structures and the ratio of resistivity anisotropy is determined. The observed values of anisotropy ratio ρ c /ρ a were ∼12.5 at 300 K and ∼54 at 25 K. The room temperature value of ρ c /ρ a varies by a few orders from the values of previously reported anisotropy results of bulk pyrolytic graphite. However, the value of resistivity anisotropy increases with decreasing temperature, which is an identical behavior to bulk pyrolytic graphite. From current I–voltage V characteristics, we observed an ohmic behavior at 300 K for both low- and high-current biasing. This behavior turns into nonlinear characteristics when the temperature goes down. As these fabricated structures consist of multiple elementary junctions along the c-axis, nonlinear IV characteristics result. The impurity assisted interlayer hopping conduction and thermal excitation of carriers play a key role in this effect.
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Keywords: ANISOTROPIC BEHAVIOR; FOCUSED ION BEAM; NONLINEAR CHARACTERISTICS; PLANAR-TYPE STRUCTURES

Document Type: Research Article

Publication date: 01 January 2011

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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