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(a) SEM image showing the typical morphology of the nanowires. (b) TEM image of the nanowire. Core/shell structure is observed and there are many grain boundaries in the shell layer.
(a) characteristics of individual nanowires measured at . The top left inset is the schematic diagram of the experimental set. The bottom right inset is the SEM image showing one single nanowire connecting the two electrodes. (b) and (c) are schematic energy-band diagrams of individual nanowires without and with oxygen adsorption, respectively.
(a) Current dependence on the logarithm of oxygen pressure. The inset is plot, which can be fit to a straight line. (b) Schematic energy-level representation of individual nanowires under high and low oxygen pressures.
(a) Response and recovery of the current upon exposure to UV illumination at , , , , and , respectively (from left to right). The two insets are the enlarged views at and , respectively. (b) Logarithm of oxygen pressure dependence to the UV current. (c) Schematic energy-band diagram of UV illuminated nanowires under high and low oxygen pressures.
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