Enhancement of H2S sensing performance of p-CuO nanofibers by loading p-reduced graphene oxide nanosheets
Enhancement of H2S sensing performance of p-CuO nanofibers by loading p-reduced graphene oxide nanosheets
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DOI：
10.1016/j.snb.2018.10.144
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发表时间：
2019-02-15
影响因子：
8.4
通讯作者：
Kim, Sang Sub
中科院分区：
文献类型：
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作者：
Kim, Jae-Hun;Mirzaei, Ali;Kim, Sang Sub
与p-n异质结相比，p-p异质结在气体传感研究中受到的关注较少。受这一事实的启发，本文将呈现p-还原氧化石墨烯（RGO）负载的p-CuO纳米纤维（NF）的气体传感特性。为了找到RGO负载的最佳值，将不同量的RGO（0.05-1.5重量%）添加到电纺CuO NF中。传感测试结果表明，CuO-0.5wt%RGO在300 ℃时对H2S具有最佳的灵敏度。此外，对干扰气体的低响应证明了最佳传感器对H2S的良好选择性。详细讨论了传感机理。CuO-0.5wt%RGO传感器对H2S气体的高响应与纳米结构、RGO的存在、CuO对H2S气体的高本征灵敏度、大量CuO纳米颗粒的存在沿着大量p-p异质结的存在有关，这些异质结将被CuO向CuS的转化所改变。本研究结果可用于新型RGO p-p异质结气体传感器的设计和制作。
Being compared to p-n heterojunctions, less attention has been paid to p-p heterojunctions for gas sensing studies. Motivated by this fact, herein, gas sensing characteristics of p-reduced graphene oxide (RGO) loaded p-CuO nanofibers (NFs) will be presented. In order to find the optimal value of RGO loading, different amounts of RGO (0.05-1.5 wt%) were added to the electrospun CuO NFs. The results of sensing tests showed that the CuO-0.5 wt% RGO has the best sensitivity to H2S at 300 degrees C. Also, low response to the interfering gases demonstrated the good selectivity of the optimal sensor towards H2S. Underlying sensing mechanism is discussed in details. High response of CuO-0.5 wt% RGO sensor towards H2S was related to NF morphology, presence of RGO, high intrinsic sensitivity of CuO towards H2S gas, presence of a lot of CuO nanograins along with the existence of the plenty of p-p heterojunctions, which will be changed by transformation of CuO to CuS. The results of present study can be used for design and fabrication of novel RGO containing p-p heterojunction gas sensors.