碳酸鈉/改質氧化石墨烯應用於室溫人體呼氣二氧化碳之感測器

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研究生：	范韻如 Fan, Yun-Ju
論文名稱：	碳酸鈉/改質氧化石墨烯應用於室溫人體呼氣二氧化碳之感測器 Application of Na2CO3/Modified Graphene Oxide on Room-temperature CO2 Sensor from Human Breath
指導教授：	戴念華 Tai, Nyan-Hwa
口試委員:	李紫原彭殿王
學位類別：	碩士 Master
系所名稱：	工學院 - 材料科學工程學系 Materials Science and Engineering
論文出版年：	2020
畢業學年度：	108
語文別：	中文
論文頁數：	90
中文關鍵詞：	氣體感測器、二氧化碳、人體呼氣、碳酸鈉、成核、還原氧化石墨烯
外文關鍵詞：	gas sensor, carbon dioxide, human breath, sodium carbonate, nucleation, reduced graphene oxide
相關次數：	點閱：2 下載：0
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近年來，應用於室溫環境下的二氧化碳感測器逐漸被重視，因其對於環境檢測與及早診斷人體疾病具有重要的角色。因此，設計一低成本、易於製備且能夠在室溫下應用的二氧化碳感測器尤為重要。以碳材料為基底且添加金屬氧化物與高分子以產生協同作用的感測材料，被廣泛研究作為電阻式氣體感測器，並且能夠展現良好的感測靈敏度以及選擇性。
本實驗首先藉由水熱法製備氮摻雜石墨烯，爾後利用界面聚合法聚合環氧丙醇高分子於其上，最後加入定量之氫氧化納溶液，於室溫下合成碳酸鈉化合物於材料之中。氮摻雜與高分子的協同作用能夠幫助提升碳酸鈉之成核速率，進而提升二氧化碳感測器之感測靈敏度。此製程除了減少總體製程時間外，於室溫下合成也可降低實際應用之設備成本，可望提升感測器之應用範圍。本研究所製備的電極，可在5%二氧化碳環境與相對濕度13%的室溫環境下達到平均9.44%的感測靈敏度，感測時間約為360秒，且能夠判別不同濃度之二氧化碳。此外，在人體呼氣感測分析上，本電極在不同呼氣吸附之模式下皆具有相當好的穩定度與再現性。因此，綜合以上所述，本研究成功製備出一具有高度商售量產潛力且可應用於人體呼氣中二氧化碳檢測的感測器。

The design of carbon dioxide (CO2) gas sensors operated under ambient conditions is crucial for environmental monitoring as well as disease screening for early diagnosis in the human body. It is important to develop CO2 sensors with low cost, ease of fabrication, and operability without heating. Recently, carbon-based materials, with the synergistic effect of metal oxides and polymers, have been widely investigated as resistive-type gas sensors with high sensitivity and selectivity. In this study, we modified N-doped reduced graphene oxide with the growth of a glycidol polymer (PEP) and crystalline sodium carbonate (Na2CO3). According to the structural analysis, Na2CO3 was fabricated with an increase in the nucleation rate as a result of the synergetic effect of the glycidol polymer and nitrogen doping. Furthermore, the fabrication process of Na2CO3 was facile, rapid, and consumed less energy. With respect to the sensing performance, the as-fabricated sensor showed a high response of 9.44% and fast response time of 400 s for the 5% CO2 sensing test operating under low ambient humidity and room temperature. In addition, the following human breath test also showed high stability and reproducibility of the sensors for breath analysis. In summary, the technology demonstrated in this work not only shows high sensing performance, but great potential in practical applications of human breath.

摘要    i
Abstract    ii
目錄    iv
表目錄    ix
圖目錄    x
第一章    緒論    1
1    前言    1
2    研究動機    2
第二章    文獻回顧    3
1    慢性肺阻塞病    3
1.1 慢性肺阻塞病之病理特徵    3
1.2 慢性肺阻塞病之檢測及其困難    4
1.3 人體呼氣檢測介紹    5
2    石墨烯簡介    7
2.1 石墨烯的特性和結構    7
2.2石墨稀的製備方式    8
2.3 石墨烯之改質    11
3    環氧丙醇高分子簡介    12
3.1 環氧丙醇高分子的基本物理性質與應用    12
3.2 環氧丙醇高分子的製程方法    12
4    碳酸鈉的簡介    13
4.1 碳酸鈉的基本物理性質與應用 　　    13
4.2 碳酸鈉的製程方法    13
5    氣體感測器    14
6石墨烯感測器    17
第三章    實驗步驟與研究方法    26
1    實驗製程設備與分析儀器    26
1.1 超音波震盪器    26
1.2 掃描式電子顯微鏡    26
1.3 拉曼光譜儀    27
1.4 傅立葉轉換紅外光譜儀    28
1.5 Ｘ光繞射分析儀    28
1.6 Ｘ射線光電子能譜儀    29
1.7 高速離心機    29
1.8 冷凍乾燥機    29
1.9 熱重分析儀    30
2    實驗製備    30
2.1 藥品準備    30
2.2 網版印刷電極    30
2.3 氧化石墨烯的製備    31
2.4 冷凍乾燥氧化石墨稀的製備    31
2.5 熱衝擊石墨烯的製備    32
2.6 氮摻雜石墨烯的製備    32
2.7 環氧丙醇/氮摻雜石墨烯複合材料的製備    32
2.8 碳酸鈉/環氧丙醇/氮摻雜石墨烯複合材料的製備    33
2.9 感測電極的製備    33
3    氣體感測之測量基準    33
3.1 感測靈敏度    34
3.2 響應時間及回復時間    34
4    氣體感測系統    34
4.1 氣體感測系統的架構    34
4.2 二氧化碳濃度之計算    35
4.3 模擬室溫下大氣中二氧化碳濃度感測之操作流程    35
5 呼氣感測系統    36
5.1 濕度系統與操作流程    36
5.2 呼氣實驗與操作流程    36
第四章    結果與討論    41
1 tsGO之結構與成分分析    41
1.1 X光繞射光譜分析    41
1.2熱重分析    42
1.3掃描電子顯微鏡之形貌分析    42
1.4 拉曼光譜儀鍵結分析    43
1.5 傅立葉轉換紅外光譜分析    43
2 NGO之結構與成分分析    44
2.1掃描電子顯微鏡之形貌分析    44
2.2拉曼光譜儀鍵結分析    45
2.3傅立葉轉換紅外光譜分析    46
2.4 熱重分析    46
2.5 X射線電子能譜儀分析    47
3 Na2CO3-PEP-NGO之結構與成分分析    47
3.1掃描電子顯微鏡之形貌分析    47
3.2 X光繞射光譜分析    48
3.2 傅立葉轉換紅外光譜分析    49
3.3 熱重分析儀分析    49
3.4 X射線電子能譜儀分析    50
4 比較組之形貌與成分分析    51
4.1 掃描電子顯微鏡之形貌分析    51
4.2 傅立葉轉換紅外光譜分析    51
4.3 X光繞射光譜分析    52
5 室溫大氣環境下之二氧化碳感測    53
5.1 塗佈參數之影響分析    53
5.2 逐層複合材料之影響分析    53
5.3 不同CO2濃度下之結果分析    55
5.4 相同CO2濃度下之循環感測分析    55
5.6 二氧化碳氣體感測提升之可能機制    56
6 呼氣感測    58
6.1 不同濕度下之感測結果    58
6.2 實際人體呼氣之循環感測結果    59
7 群體實驗    61
第五章    結論    85
參考文獻 86

                                

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