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(a) SEM image and [(b) and (c)] TEM images of the ceria nanowires.
UV response of the ceria nanowires in air, exhibiting negative photoconductivity.
curve of the device from air to vacuum ; the current decreases rapidly as the pump is on. Inset; the enlarged decrease edge.
(a) Photocurrent in response to the mixed gas. During the measurement, the UV light is on. Regions I and III are in vacuum and region II is in mixed gas. (b) UV response of the ceria nanowires at different dry pressures, exhibiting positive photoconductivity.
Schematic representations of the ceria nanowires in response to UV illumination in (a) air and (b) dry atmosphere, respectively.
Current before and after UV under different dry oxygen pressures.
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