Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 648, Issue -, Pages 571-576Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2015.07.035
Keywords
Ga-doped ZnO; Self-powered; Piezoelectric; Humidity sensing; Nanogenerator
Categories
Funding
- National Natural Science Foundation of China [51102041, 11104025]
- Fundamental Research Funds for the Central Universities [N120205001, N140505004]
- Program for New Century Excellent Talents in University [NCET-13-0112]
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High sensitivity and fast response piezo-humidity sensing have been realized from Ga-doped ZnO nanowire (NW) nanogenerator (NG) as self-powered/active gas sensor. The piezoelectric output generated by Ga-doped ZnO NW NG can not only act as a power source for driving the device, but also as a sensing signal for detecting humidity. Upon exposure to 80% relative humidity (RH) at room temperature, the piezoelectric output of Ga-doped ZnO NWs decreases from 0.56 V (in 45% RH) to 0.12 V, and the sensitivity is up to 358, higher than that of undoped ZnO NWs. In addition, the response time of Ga-doped ZnO NWs is 5 s, much shorter than that of undoped ZnO NWs. Such high performance can be ascribed to that Ga3+ ions can provide many donor defects and produce high local charge density/strong electrostatic field. The present results demonstrate a feasible approach for realizing high performance self-powered/active humidity sensor. (C) 2015 Elsevier B.V. All rights reserved.
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