Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 301, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2019.127019
Keywords
TiO2-decorated CuO nanosheets; p-n junction; TEA gas sensor; Trace detection; Low working temperature
Funding
- National Natural Science Foundation of China [51672109, 21707043, 51802117]
- Natural Science Foundation of Shandong Province for Excellent Young Scholars [ZR2016JL015]
- Science and technology projects of University of Jinan [XKY1911]
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Considering the poor sensing abilities and high working temperatures for trace triethylamine (TEA) detection, design and fabrication of TEA gas sensors with high sensitivity and low power consumption are still desired. Decorating p-type substrate with n-type semiconductor to form p-n junction is considered to be an effective approach to enhance their sensing abilities. Herein, regular droplets on salix leaf' like CuO/TiO2 nano-composites were designed and successfully synthesized using a two-step method including a water bath treatment and a TiF4 solution etching process. Surface characterizations indicated that the CuO substrate exhibited a salix leaf like nanosheets structure with massive TiO2 nanoparticles (about 11 nm) decorated on its surface. Excitingly, gas sensing results showed that the CuO/TiO2 sensors exhibited a high sensing response of 12.7 5 ppm TEA at a low working temperature (160 degrees C) and possessed a low detection limit (0.5 ppm). The sensing mechanism was also proposed and attributed to the massive highly dispersed p-n junctions between CuO and TiO2 nanoparticles, which could significantly change the electrical conductivity and oxygen adsorption abilities. In addition, X-ray photoelectron spectroscopy and Electron paramagnetic resonance measurements confirmed the existence of large amounts of surface oxygen vacancy regions and chemisorbed and dissociated oxygen species, which were beneficial to their gas sensing abilities. This work provides a new strategy to fabricate highly sensitive trace TEA gas sensing materials with low working temperatures, which will also promote the application of p-type gas sensors.
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