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Top-down SEM image of VO2 nanowires fabricated by using the nanoimprint lithography process in a wide area. Upper inset shows a 50°-tilted and magnified SEM image of a nanowire showing a rectangular beam structure. Lower inset shows an AFM image.
(a) Schematic illustration of a 30-μm-wide VO2 wire on TiO2 (001) substrate. (b) Optical microscope images of a 30 × 30 μm region showing a 30-μm-wide wire at temperatures from 17 to 40 °C. Two virtual electrodes are shown at the left and right edges of the images. (c) Schematic illustration of 1-μm-wide wires. (d) Optical microscope images of a 8 × 8 μm region showing a 1-μm-wide wire at temperatures from 17 to 50 °C. Two virtual electrodes are shown at the left and right edges of the center wire of the images.
Pc value vs width for the VO2 wires. The value of Pc was about 0.59 in the case of wires 28 μm in width, indicating that the system is two-dimensional, whereas the value of 1 in the case of wires 1 μm in width indicates that the system is one-dimensional.
(a) Temperature dependence of resistivity for both 1D (red square) and 2D (blue circle) domain configurations. (b) Conductivity vs ratio of metal phase for 1D (red square) and 2D (blue circle) domain configurations. Red lines show expected results calculated from a 1D serial resistance model, while the blue one shows expected results calculated from a 2D percolation model.
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