Selectivity Enhancement of YSZ-based VOC Sensor Utilizing SnO_2/NiO-SE via the Application of a Physical Gas-diffusion Barrier
Selectivity Enhancement of YSZ-based VOC Sensor Utilizing SnO_2/NiO-SE via the Application of a Physical Gas-diffusion Barrier
复制标题
通过物理气体扩散阻挡层的应用，利用 SnO_2/NiO-SE 提高基于 YSZ 的 VOC 传感器的选择性
DOI：
10.1149/05012.0129ecst
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
et al
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文献类型：
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作者：
Tomoaki Sato;et al
利用SnO2/NiO(+Al_2O_3)敏感电极(SE)对YSZ(YSZ)气敏传感器的传感特性进行了评价，希望对室内挥发性有机化合物(VOCs)进行ppb水平的选择性检测。该传感器对50 ppb的C7H8(甲苯)有较好的响应，而对大气中平均浓度的干扰气体(C3H6、H2、CO、NO2、C2H5OH(乙醇))的响应可以忽略不计。然而，据观察，由于在饮料、烹饪和清洁产品中普遍使用酒精，甲苯的检测受到高浓度乙醇的强烈影响，在室内环境中，酒精浓度可达到约10倍的峰值。为了克服这一局限性，在NiO-SE裸露的边缘形成了由纳米Al_2O_3颗粒组成的物理气体扩散势垒，通过避免乙醇直接渗透到NiO-SE中，促进了乙醇在SnO2催化层中的有效氧化。利用SnO2/Al_2O_3/NiO(+Al_2O_3)-SE传感器研制的YSZ传感器能够选择性地检测低于室内标准浓度的芳香族挥发性有机物，且受高浓度乙醇的干扰很小。
The sensing characteristics of an yttria-stabilized zirconia (YSZ)-based gas sensor utilizing an SnO2/NiO (+ Al2O3) sensing-electrode (SE) were evaluated, with aspirations of selective ppb level detection of indoor volatile organic compounds (VOCs). The fabricated sensor gave a preferential response towards 50 ppb C7H8 (toluene), while exhibiting negligible responses towards interfering gases (C3H6, H2, CO, NO2, C2H5OH (ethanol)) at their average atmospheric concentrations. However, it was observed that toluene detection was strongly affected by high concentration ethanol, which can peak to approximately 10 times higher in concentration in indoor environments, owing to the ubiquitous use of alcohol in beverages, cooking and cleaning products. To overcome this limitation, a physical gas-diffusion barrier which was comprised of nano-Al2O3 particles was formed on the exposed edges of the NiO-SE, which assisted in the effective oxidation of ethanol in the SnO2 catalytic layer, by avoiding direct penetration of ethanol into NiO-SE. The developed YSZ-based sensor utilizing an SnO2/Al2O3/NiO (+ Al2O3)-SE was found to be capable of selectively detecting aromatic VOCs lower than the indoor guideline concentrations, with low interference from high ethanol concentrations.