Interface Engineering UV-visible Light Photodetector and Room Temperature Gas Sensor by Using Polycrystalline Structure TiO2 Nano-fiber
Pin-Chun Pan1, Chih-Ming Chang1, Chien-Min Chang2, Ping-Hung Yeh1*
1Physics, Tamkang University, New Taipei City, Taiwan
2Institute of EO Engineering, National Chiao Tung University, Hsinchu, Taiwan
* presenting author:Pin-Chun Pan,
Herein, we fabricated polycrystalline TiO2 nano-fibers (p-TiO2 NFs) by electrospinning. Compared with single crystalline nanostructure (s-TiO2 NW), p-TiO2 NFs not only have response with UV light, but also have response with visible light due to the defects. The broadband light detection property can be achieved by using p-TiO2 NFs under different gas and humidity environment. We also discuss the main mechanism of polycrystalline NF through the different size of interfaces and defect amounts. In this research work, we can figure out how the defect structure affect the output current, response time, sensibility of poly structure NFs and clarify the mechanism of the broadband light detection. Based on interface engineering, broadband light detector and room temperature humidity detector can be achieved.

Keywords: defects, electrospinning, polycrystalline, interface, sensor