Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 705, Issue -, Pages 112-117Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2017.02.118
Keywords
TiO2; Nanosheet; Gas sensor; p-Type
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Funding
- National Natural Science Foundation of China [11574189, 11105047, 11604196]
- Science and Technology Program of Shaanxi Province [2016KJXX-15]
- Fundamental Research Funds for the Central Universities [GK201602006, GK201603018, GK201603013, GK201501004]
- Scientific Research Staring Foundation of the Education Ministry for Returned Chinese Scholars
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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. (C) 2017 Elsevier B.V. All rights reserved.
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