Journal
MATERIALS LETTERS
Volume 256, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.matlet.2019.126657
Keywords
Sensors; Nanocomposites; ZnO nanorod; Cu2O nanocube; Au nanoparticle; NO2 gas sensing
Funding
- Ministry of Science and Technology, Taiwan [107-2218-E-492-007, 107-2221-E-007-084]
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In this work, the use of a ternary Au/Cu2O/ZnO nanocomposite for low concentration chemiresistive NO2 gas sensing at room temperature is reported. ZnO nanorods are first grown on a Si substrate with pre-patterned electrodes. Cu2O nanocubes and Au nanoparticles are sequentially photoreduced on ZnO nanorods. Under UV-activation, the responses are 26% and 3590% at 5 and 1000 ppb, respectively. The response shows an excellent exponential relationship with the concentration. Below 100 ppb, the response can be considered linearly proportional to the concentration with a sensitivity of 83 ppm(-1). The high response of the nanocomposite can be attributed to combined effects of enhanced gas adsorption and efficient charge separation. (C) 2019 Elsevier B.V. All rights reserved.
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