Gas Selectivity Control in Co3O4 Sensor via Concurrent Tuning of Gas Reforming and Gas Filtering using Nanoscale Hetero-Overlayer of Catalytic Oxides,ACS Applied Materials & Interfaces

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Gas Selectivity Control in Co3O4 Sensor via Concurrent Tuning of Gas Reforming and Gas Filtering using Nanoscale Hetero-Overlayer of Catalytic Oxides
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2017-11-15 00:00:00 , DOI: 10.1021/acsami.7b13998
Hyun-Mook Jeong ₁ , Seong-Yong Jeong ₁ , Jae-Hyeok Kim ₁ , Bo-Young Kim ₁ , Jun-Sik Kim ₁ , Faissal Abdel-Hady ₂ , Abdulaziz A. Wazzan ₂ , Hamad Ali Al-Turaif ₂ , Ho Won Jang ₃ , Jong-Heun Lee _{1,

2}

Affiliation

Co₃O₄ sensors with a nanoscale TiO₂ or SnO₂ catalytic overlayer were prepared by screen-printing of Co₃O₄ yolk–shell spheres and subsequent e-beam evaporation of TiO₂ and SnO₂. The Co₃O₄ sensors with 5 nm thick TiO₂ and SnO₂ overlayers showed high responses (resistance ratios) to 5 ppm xylene (14.5 and 28.8) and toluene (11.7 and 16.2) at 250 °C with negligible responses to interference gases such as ethanol, HCHO, CO, and benzene. In contrast, the pure Co₃O₄ sensor did not show remarkable selectivity toward any specific gas. The response and selectivity to methylbenzenes and ethanol could be systematically controlled by selecting the catalytic overlayer material, varying the overlayer thickness, and tuning the sensing temperature. The significant enhancement of the selectivity for xylene and toluene was attributed to the reforming of less reactive methylbenzenes into more reactive and smaller species and oxidative filtering of other interference gases, including ubiquitous ethanol. The concurrent control of the gas reforming and oxidative filtering processes using a nanoscale overlayer of catalytic oxides provides a new, general, and powerful tool for designing highly selective and sensitive oxide semiconductor gas sensors.

中文翻译：

通过并发调整气体重整和气体过滤并同时使用纳米级催化杂化异质层来控制Co ₃ O ₄传感器中的气体选择性

通过丝网印刷Co ₃ O ₄卵黄壳球并随后电子束蒸发TiO ₂和SnO ₂来制备具有纳米级TiO ₂或SnO ₂催化覆盖层的Co ₃ O ₄传感器。具有5 nm厚TiO ₂和SnO ₂覆盖层的Co ₃ O ₄传感器在250°C下对5 ppm二甲苯（14.5和28.8）和甲苯（11.7和16.2）表现出高响应（电阻比），而对干扰气体的响应可忽略不计作为乙醇，HCHO，CO和苯。相比之下，纯Co ₃ O ₄传感器对任何特定气体均未显示出显着的选择性。通过选择催化覆盖层材料，改变覆盖层厚度并调整感测温度，可以系统地控制对甲基苯和乙醇的响应和选择性。对二甲苯和甲苯的选择性的显着提高归因于将反应性较低的甲基苯重整为反应性较小的物质，并对包括无处不在的乙醇在内的其他干扰气体进行了氧化过滤。使用纳米级催化氧化物覆盖层对气体重整和氧化过滤过程的同时控制，为设计高度选择性和灵敏的氧化物半导体气体传感器提供了一种新的，通用的，功能强大的工具。

更新日期：2017-11-16

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