複合高分子氣體感測元件的電紡製作與性能改進

Abstract

近年來電紡技術日益進步，其製程設備簡單且易於製作奈米直徑纖維的特性，使得創製高比表面積纖維不再困難，也為氣體感測器的發展帶來進一步的希望。本研究的目的是要利用電紡技術來發展具有高度敏感性與再現性，可供一般溫度環境下使用的氣體感測器。 研究中使用PVP做為紡製奈米纖維的主體材料，其內予以混入PEDOT/PSS複合高分子，以賦予纖維導電性，供做為感測主體，另外再添加不同比例有機溶劑(DMSO)來提高感測靈敏度與再現性。實驗利用電紡法製作不同絲徑、DMSO比例的氣體感測元件，並進行其感測特性之實驗測試。研究結果顯示：絲徑小的氣體感測器對低濃度酒精氣體有較好的靈敏度；絲徑大的氣體感測器則有較優的耐久度。添加適當比例的有機溶劑DMSO不僅可幫助氣體感測器偵測酒精氣體時有更好的靈敏度與快速響應回復時間，尚能增加感測器對待測 氣體的耐久度。故有機溶劑DMSO對氣體感測器性能提升是有幫助的。

In recent years, with advancements in electrospinning technology, simple and easy manufacturing equipment has become a crucial characteristic of nanofiber fabrication. The improved ease of creating fibers with high specific surface area increased the likelihood of developing superior gas sensors. This study uses electrospinning technology to develop a gas sensor with high sensitivity and reproducibility under average temperature conditions. In this study, PVP was used as the principal material for nanofiber fabrication. The PVP containing mixed polymer composite PEDOT / PSS that provide fibers with electrical conductivity enables their use as sensors. In addition, various proportions of organic solvents (DMSO) were added to increase the sensitivity and reproducibility of sensors. Experiments using the electrospinning method were conducted to produce gas-sensing elements with various wire diameters and DMSO ratios. The sensing characteristics were also tested. The results generated were: gas sensors with a small wire diameter had higher sensitivity toward low concentrations of ethanol gas, while gas sensors with a large wire diameter had superior durability. The addition of an appropriate proportion of DMSO not only increased the sensitivity and response/recovery time of gas sensors during ethanol gas detection, but also increased the durability of sensors for gas to test. Therefore, DMSO contributed to improving the performance of gas sensors.