Abnormal p-type sensing response of TiO2 nanosheets with exposed {001} facets

作者：Liu, Chang; Lu, Hongbing^*; Zhang, Jinniu; Yang, Zhibo; Zhu, Gangqiang; Yin, Feng; Gao, Jianzhi; Chen, Chujun; Xin, Xia

来源：Journal of Alloys and Compounds, 2017, 705: 112-117.

DOI：10.1016/j.jallcom.2017.02.118

• TiO2
• Nanosheet
• Gas sensor
• p-Type

TiO2 nanosheets with exposed {001} high-energy facets were used as gas sensing materials. Interestingly, the sensor displayed a regular n-type response to alcohol with high sensitivity at high temperatures above 250 degrees C, but abnormal p-type sensing behavior over a wide temperature range from room temperature to 120 degrees C. Such an unusual p-type sensing response, unprecedented for n-type TiO2 nanomaterials, was attributed to the proton transfer between alcohol molecules and adsorbed water molecules on the surface of TiO2 nanosheets. The present work provides a new insight into the gas sensing mechanism of metal oxide nanostructures.

• 出版日期2017-5-25
• 单位陕西师范大学