Electrospun CuO Nanofibre Assemblies for H2S Sensing
Electrospun CuO Nanofibre Assemblies for H2S Sensing
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DOI：
10.1515/zpch-2017-1097
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发表时间：
2019-01-01
影响因子：
2.5
通讯作者：
Smarsly, Bernd M.
中科院分区：
文献类型：
--
作者：
Seitz, Christoph;Werner, Sebastian;Smarsly, Bernd M.
氧化铜（CuO）纳米纤维用于检测ppm（百万分之一）范围内的有毒和磨蚀性气体硫化氢（H2S）。通过CuO的检测基于CuS形成时电导的显著增加，并且因此对H2S具有选择性和灵敏度。纳米纤维通过补偿传感过程中发生的体积应力而优于CuO薄膜。在这里，传感器呈现出高达600次的感测和再生循环。为了进一步了解纤维在与H2S反应后的降解，通过扫描电子显微镜（SEM）、透射电子显微镜（TEM）、X射线衍射（XRD）、电阻和线性扫描伏安法（LSV）测量在循环之前和之后分析传感器。SEM和TEM显示CuO纤维的形态发生了剧烈变化，导致600次循环后纳米颗粒的不确定聚集体。电阻和LSV测量表明，接触和测量过程本身是优化CuO基H2S传感器长期使用的关键因素。
Copper oxide (CuO) nanofibres are utilised to sense the toxic and abrasive gas hydrogen sulfide (H2S) in the ppm (parts per million) range. The detection by CuO is based on a significant increase in the conductance upon the formation of CuS, and is thereby selective and sensitive towards H2S. Nanofibres outperform thin films of CuO by compensating the volumetric stress which occurs during sensing. Here, sensors are presented exhibiting up to 600 cycles of sensing and regeneration. To get further insights into the degradation of the fibres upon the reaction with H2S the sensors were analysed by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), resistance and linear sweep voltammetry (LSV) measurements before and after cycling. SEM and TEM revealed a drastic change in morphology of the CuO fibres resulting in an undefined aggregate of nanoparticles after 600 cycles. Resistance and LSV measurements showed that the contacting and the measurement process itself are crucial factors for optimising long-term use of CuO-based H2S sensors.