se9b01697_si_001.pdf (2.33 MB)
Cuprous Oxide Based Chemiresistive Electronic Nose for Discrimination of Volatile Organic Compounds
journal contribution
posted on 2019-10-18, 18:35 authored by Baishu Liu, Xue Wu, Kenneth W. L. Kam, Wai-Fung Cheung, Bo ZhengThis
paper reports a facile functionalization method on a metal-oxide
semiconductor and a cuprous oxide (Cu2O) based chemiresistive
electronic nose for the detection of volatile organic compounds (VOCs).
A library of functionalized Cu2O nanospheres was developed
through silanization using chemically diverse organosilanes. An electronic
nose was fabricated with unmodified Cu2O nanospheres and
five types of functionalized Cu2O nanospheres as the sensing
elements. The electronic nose showed stable and rapid resistance responses
to 25–200 ppm model VOCs, with the operating temperature of
180 °C. Single VOCs and ternary VOC mixtures could be discriminated
by the electronic nose, and six types of tea leaves were also proved
to be distinguishable as an illustration of the application of the
electronic nose. We expected that the silanization could provide a
simple approach for material diversification and the electronic nose
would have further application in identification and discrimination
of complex gas samples.