Department of Chemistry , The Chinese University of Hong Kong , Shatin , NT, Hong Kong , China.
Qi Diagnostics Limited , Mongkok , Kowloon , Hong Kong , China.
ACS Sens. 2019 Nov 22;4(11):3051-3055. doi: 10.1021/acssensors.9b01697. Epub 2019 Oct 18.
This paper reports a facile functionalization method on a metal-oxide semiconductor and a cuprous oxide (CuO) based chemiresistive electronic nose for the detection of volatile organic compounds (VOCs). A library of functionalized CuO nanospheres was developed through silanization using chemically diverse organosilanes. An electronic nose was fabricated with unmodified CuO nanospheres and five types of functionalized CuO 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.
本文报道了一种在金属氧化物半导体和基于氧化亚铜（CuO）的电阻式电子鼻上进行功能化的简便方法，用于检测挥发性有机化合物（VOCs）。通过使用化学性质不同的有机硅烷进行硅烷化，制备了一系列功能化的 CuO 纳米球库。电子鼻由未修饰的 CuO 纳米球和五种类型的功能化 CuO 纳米球作为传感元件制成。该电子鼻在 180°C 的工作温度下对 25-200 ppm 模型 VOCs 表现出稳定且快速的电阻响应。电子鼻可以区分单一 VOC 和三元 VOC 混合物，并且还可以证明六种类型的茶叶是可区分的，这说明了电子鼻的应用。我们期望硅烷化可以为材料多样化提供一种简单的方法，并且电子鼻将在复杂气体样品的识别和区分方面有进一步的应用。
