Leveraging the Surface Effect of Dual-Phase Lanthanum Dioxycarbonate to Sense Carbon Dioxide

Y. Hsiao, Te-Hua Fang, Liang-Wen Ji, Shi-Hong Yang
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Abstract

In this study, fabrication of dual phased La2O2CO3 films using an electrostatic spray technique was investigated and the developed films were used as CO2 gas sensors. Results demonstrated that La2O2CO3 films contained relatively high amounts of hexagonal phase formation when high concentrations of polyvinyl pyrrolidone (PVP) are used. Furthurmore, low concentrations of PVP yielded discontinuous films. The gas sensing results demonstrated that sensing efficiency can be improved by optimizing the concentration of PVP content. The results indicated that the highest response of 18% in the presence of 2000 ppm CO2 was attained by the film having a PVA concentration of 6 wt%. Structural and elemental analysis of La2O2CO3 films were verified using X-ray diffractometry, scanning electron microscopy, and energy-dispersive X-ray spectroscopy analyses. This study validates the sensing functionality of dual-phase La2O2CO3 films, which can function at gas concentrations that are as low as 800 ppm and are environmentally friendly.
利用双相二氧碳酸镧的表面效应感应二氧化碳
本研究探讨了利用静电喷涂技术制造双相 La2O2CO3 薄膜的方法,并将所开发的薄膜用作二氧化碳气体传感器。结果表明,当使用高浓度的聚乙烯吡咯烷酮(PVP)时,La2O2CO3 膜含有相对较多的六方相。此外,低浓度的 PVP 会产生不连续的薄膜。气体传感结果表明,通过优化 PVP 的浓度可以提高传感效率。结果表明,PVA 浓度为 6 wt% 的薄膜在二氧化碳浓度为 2000 ppm 时的响应率最高,达到 18%。使用 X 射线衍射仪、扫描电子显微镜和能量色散 X 射线光谱分析验证了 La2O2CO3 薄膜的结构和元素分析。这项研究验证了双相 La2O2CO3 薄膜的传感功能,它可以在气体浓度低至 800 ppm 的情况下发挥作用,而且对环境无害。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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