Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, Liaoning 116023, PR China; College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, Hubei 430072, PR China.
Faculty of Chemical, Environmental and Biological Science and Technology, Dalian University of Technology, Dalian, Liaoning 116024, PR China.
Biosens Bioelectron. 2015 Feb 15;64:547-53. doi: 10.1016/j.bios.2014.09.081. Epub 2014 Oct 2.
We have innovatively developed an electronic nose consisting of only one type of semiconductor metal oxide (SMO) material. The representative SMO material, porous In2O3 microtubes in this work, offered great surface area and large gas penetration channels. By using a solvent casting process, different amounts of porous In2O3 microtubes were coated on Al2O3 substrate, forming a resistometric SMO sensor array-based electronic nose. Each sensing unit in the electronic nose exhibited independent response toward ethanol. We have successfully applied this electronic nose to distinguish four alcohols at the same concentrations (100 ppm), and also utilized the electronic nose for the discrimination of 14 volatile organic compounds (VOCs). Clear differentiation among all the 14 VOCs both at their immediately dangerous to life or health (IDLH) and the permissible exposure limit (PEL) concentrations has been achieved with no errors or misclassifications. We expect that this method will expand the application of SMO sensor array-based electronic nose which has been largely limited by the selection of commercially available SMOs and dopants.
我们创新性地开发了一种仅由一种类型的半导体金属氧化物（SMO）材料组成的电子鼻。在这项工作中，代表性的 SMO 材料多孔 In2O3 微管提供了巨大的表面积和大的气体渗透通道。通过使用溶剂铸造工艺，将不同量的多孔 In2O3 微管涂覆在 Al2O3 基板上，形成基于电阻式 SMO 传感器阵列的电子鼻。电子鼻中的每个传感单元对乙醇表现出独立的响应。我们已经成功地将这种电子鼻应用于区分四种浓度相同的醇（100ppm），并且还利用电子鼻区分了 14 种挥发性有机化合物（VOCs）。在立即威胁生命或健康（IDLH）和允许暴露极限（PEL）浓度下，所有 14 种 VOC 都能清晰地区分，没有错误或错误分类。我们预计，这种方法将扩展基于 SMO 传感器阵列的电子鼻的应用，而这在很大程度上受到商业上可用的 SMO 和掺杂剂的选择的限制。
