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首页> 外文会议>Nanotechnology III; Proceedings of SPIE-The International Society for Optical Engineering; vol.6591 >Electrospun tin oxide nanofibers for gas sensing applications
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Electrospun tin oxide nanofibers for gas sensing applications

机译：静电纺丝氧化锡纳米纤维，用于气体传感应用

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摘要

Tin oxide is a binary semiconductor with a wide band gap (E_g = 3.6 eV at 300 K) and has been used, mostly in the form of thin films, as the active element in gas sensing applications. As a fiber it is expected to have improved sensitivity as the surface-to-volume ratio increases. The authors fabricated undoped tin oxide and antimony-doped tin oxide nanofibers using electrospinning and metallorganic decomposition techniques. The precursor solution for the undoped fibers was based on a tin (IV) chloride and a viscous solution based on poly(ethylene oxide) (PEO). The antimony-doped precursor solution had an additional antimony trichloride solution made from isopropanol to obtain a Sb concentration of 1.5 %. To study the sensitivity of the fibers to gas exposure, both single nanofibers and nanofiber mats were electrospun onto Si/SiO_2 wafers. The changes in the nanofiber resistance with exposure and removal of methanol were measured as a function of time and gas concentration. In both configurations, the undoped nanofibers show higher sensitiviy to the presence and removal of methanol. Both the undoped and antimony-doped tin oxide single nanofibers show faster response times than the nanofiber mats. Of all the configurations tested, the antimony-doped single fiber gives more stable and faster response.
机译：氧化锡是一种具有宽禁带宽度（在300 K时E_g = 3.6 eV）的二元半导体，主要以薄膜形式用作气体传感应用中的活性元素。作为纤维，期望随着表面体积比的增加而具有改善的灵敏度。作者使用静电纺丝和金属有机分解技术制造了未掺杂的氧化锡和掺锑的氧化锡纳米纤维。未掺杂纤维的前体溶液基于氯化锡（IV），粘性溶液基于聚环氧乙烷（PEO）。掺杂锑的前体溶液具有由异丙醇制成的另外的三氯化锑溶液，以获得1.5％的Sb浓度。为了研究纤维对气体暴露的敏感性，将单根纳米纤维和纳米纤维垫都静电纺丝到Si / SiO_2晶片上。测量了纳米纤维的抗性随甲醇的暴露和去除而变化的时间和气体浓度的函数。在这两种配置中，未掺杂的纳米纤维对甲醇的存在和去除表现出更高的敏感性。未掺杂和掺杂锑的氧化锡单纳米纤维均显示出比纳米纤维垫更快的响应时间。在所有测试配置中，掺杂锑的单光纤可提供更稳定和更快的响应。

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