Journal
MATERIALS LETTERS
Volume 158, Issue -, Pages 274-277Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.matlet.2015.05.155
Keywords
Ag nanoparticles; Biosynthesis; ZnO; Gas sensor
Funding
- Changzhou Science and Technology Innovation Project [CC20120031, CC20130204]
- Research and Innovation Project for College Graduates of Jiangsu Province
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Ag-coated ZnO nanoparticles are synthesized by a biological process using Tribulus terrestris leaf extract. The characterization results confirmed that Ag nanoparticles have been coated on the surface of ZnO nanoparticles. Ag nanoparticles on the surface of ZnO are spherical in shape, ranging between 6 and 10 nm in diameter. Gas-sensing tests reveal that all the resistance values of the sensors decrease with increasing of eathanol concentration. Moreover, the resistance of Ag-coated ZnO sensor was generally much lower than that of pure ZnO sensor. Thus, Ag nanoparticles coating paly an important role for the sensitivity of the gas sensor working at room temperature. (C) 2015 Elsevier B.V. All rights reserved.
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