期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 255, 期 -, 页码 3384-3390出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2017.09.165
关键词
Zinc oxide; Copper oxide; Nanosheet; Gas sensing; p-n junction
资金
- National Basic Research Program of China (973 Program) [2013CB632900]
- National Natural Science Foundation of China [21473045, 51401066]
- Fundamental Research Funds from the Central University [PIRS OF HIT A201503]
Ultrathin two-dimensional ZnO nanosheets (NSs) with thicknesses of just a few nanometers have been fabricated by a solvothermal method. The very large surface area to volume ratio of this material translates into outstanding electrical sensing responses to ethanol (as high as S similar to 97 to 200 ppm of ethanol at a working temperature of 320 degrees C). Decorating these ZnO NSs with CuO nanoparticles (NPs), by pulsed laser ablation of a CuO target at room temperature and then post-annealing at 400 degrees C, yields CuO-ZnO NSs that display a further up to 2-fold enhanced response to ethanol vapour, reduced sensor response and recovery times, high sensing repeatability and high selectivity. Mechanisms underpinning the enhanced sensing properties of the CuO-ZnO NSs are discussed in terms of CuO NP-induced p-n junction depletion regions and increases in the density of active sites for ethanol adsorption and for reaction with adsorbed oxygen species. (C) 2017 Elsevier B.V. All rights reserved.
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