2.3.4 Electrospun Copper(II)oxide Fibers as Highly Sensitive and Selective Sensor for Hydrogen Sulfide Utilizing Percolation Effects
2.3.4 Electrospun Copper(II)oxide Fibers as Highly Sensitive and Selective Sensor for Hydrogen Sulfide Utilizing Percolation Effects
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DOI：
10.5162/imcs2012/2.3.4
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发表时间：
2012-05
期刊：
影响因子：
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通讯作者：
J. Hennemann;T. Sauerwald;C. Kohl;T. Wagner;J. Dräger;S. Russ
中科院分区：
文献类型：
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作者：
J. Hennemann;T. Sauerwald;C. Kohl;T. Wagner;J. Dräger;S. Russ
我们提出了一种新的传感器，用于检测硫化氢（H2S），使用网络的电纺氧化铜（II）（CuO）纤维。该传感器对H2S非常敏感，检测限低于0.1 ppm，对一氧化碳、氢气、甲烷或氨等还原性气体没有反应。这种对H2S的选择性在高度污染的气体样品中是有利的，例如在生物气反应器中。这些属性是由于一个独特的传感器机制的基础上的可逆相变的p型氧化铜退化的p型硫化铜（CuS）在附近的表面。在160°C的温度下，传感器在时间跨度tc之后显示电导的急剧增加，这取决于所提供的H2S浓度。我们研究了这一机制，通过使用CuO薄膜作为模型传感器，并解释结果的逾渗理论的框架。为了再生，传感器必须加热到350°C以将CuS转化回CuO。
We propose a novel sensor for the detection of hydrogen sulfide (H2S) using a network of electrospun copper(II)oxide (CuO) fibers. The Sensor is very sensitive to H2S with a detection limit below 0.1 ppm and exhibits no response to reducing gases like carbon monoxide, hydrogen, methane or ammonia. This selectivity to H2S is advantageous in highly contaminated gas samples e.g. in biogas reactors. These properties are due to an unique sensor mechanism based on a reversible phase transition of p-type CuO to degenerated p-type copper sulfide (CuS) in the vicinity of the surface. At a temperature of 160°C the sensor shows a steep increase of conductance after a time span tc , which depends on the offered H2S concentration. We investigated this mechanism by using a CuO thin film as a model sensor and interpret the result in a framework of percolation theory. For regeneration the sensor has to be heated up to 350°C to convert the CuS back into CuO.