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研究生:吳家興
研究生(外文):Jia-XingWu
論文名稱:硫醇單分子層修飾蕭特基式氮氧化物感測器之研製
論文名稱(外文):Fabrication of Thiol Monolayer Functionalized Schottky-type NOx Sensors
指導教授:陳慧英陳慧英引用關係
指導教授(外文):Huey-Ing Chen
學位類別:碩士
校院名稱:國立成功大學
系所名稱:化學工程學系
學門:工程學門
學類:化學工程學類
論文種類:學術論文
論文出版年:2018
畢業學年度:106
語文別:中文
論文頁數:94
中文關鍵詞:自組裝單分子層雙硫醇蕭特基二極體氣體感測器氮氧化物
外文關鍵詞:Self-assembled monolayersDithiolSchottky diodeGas sensorsNitrogen oxides
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本研究係以雙硫醇單分子層修飾金/磷化銦鎵(Au/InGaP)蕭特基二極體作為氮氧化物(NOX)之氣體感測器。實驗中,首先製作金/磷化銦鎵蕭特基二極體,再以含浸法將雙硫醇單分子層(簡稱SAM)修飾於金膜表面,並以此元件進行氮氧化物感測特性之探討。
文中改變雙硫醇碳數及含浸時間來選擇最適之SAM製備條件;另外,改變NOx濃度、溫度及氣體種類等操作變因來探討元件對NOx感測特性,如:靈敏度、選擇性、響應及回復速率等性質之影響。為測定雙硫醇分子在金膜上之吸附量,以循環伏安法來加以分析。
由實驗結果可知,當雙硫醇之碳數3~10間時,雙硫醇分子在金膜上之吸附量亦增加,故元件對NOx感測靈敏度亦隨之增加;但當碳數大於10時,雙硫醇在金膜上之吸附量反而減少,導致元件對NOx之感測靈敏度亦隨之下降。換言之,癸二硫醇(碳數10)為最佳之修飾劑。另外,由含浸時間探討顯示,當含浸時間增加時,SAM量增加,所得元件之感測靈敏度亦隨之增加,當含浸時間為60小時,元件呈現最佳之感測特性,在30℃,100 ppm下,元件對NO2之感測靈敏度為19.9,響應時間為10.7s,回復時間為27.0s;NO之感測靈敏度為8.7,響應時間為16.9s,回復時間為43.1s。
以癸二硫醇修飾Au/InGaP元件進行操作變因之探討時,發現元件對NOx之感測靈敏度隨濃度增加而增大,但隨溫度之升高而降低,即在30℃為最佳之感測溫度。以乙醇、二氧化碳、一氧化碳、甲醇、甲醛、氫氣、氨氣等氣體來進行選擇性之探討,發現元件對一氧化碳、甲醇、甲醛、氫氣、氨氣無響應,而對乙醇、二氧化碳呈現極佳之選擇性。進一步以吸附動力模式來描述元件對NOx之感測行為。結果發現暫態感測動力符合一階吸附模式,且在穩態下,感測靈敏度與濃度之關係符合Langmuir模式。
In this work, we devoted to fabricate the NOx sensor based on Au/InGaP Schottky diode. In order to enhance NOx selectivity and sensing response, self-assembled monolayer (SAM) – dithiol was used for modifying the Schottky contact because of its self-assembled property and particular functional group. The effect of SAM immersion time (t=1,6,12,24,36,48,60h) and carbon number of SAM (n=3,6,9,10,11,16) has been comprehensively discussed in our research. In addition, the selectivity and sensing performance of dithiol modified Au/InGaP Schottky diode in different temperature and NOx concentration has been researched. With a view to fabricating the best NOx sensing performance Schottky diode, cyclic voltammetry is applied to simulate the thiol monolayer self-assembled on Au surface and its amount is also further calculated by reduction peak current analysis. At the end of this study, the first order kinetic and thermodynamic model has been fitting successfully with NOx sensing results.
總目錄
中文摘要 II
Extended Abstract IV
誌謝 XIV
總目錄 XV
表目錄 XVII
圖目錄 XVIII
符號表 XXI

第一章 緒 論 1
1.1 前言 1
1.2 氣體感測器 1
1.3 蕭特基式氣體感測器 4
1.3.1 元件結構 5
1.3.2 原理 5
1.3.3 蕭特基氣體感測器之應用 6
1.4 雙硫醇自組裝單分子層修飾蕭特基電極 7
1.4.1 雙硫醇自組裝單分子層之結構 7
1.4.2 自組裝單分子層形成機制 8
1.4.3 自組裝單分子層之應用 9
1.5 研究目的與動機 10
第二章 原 理 18
2.1 蕭特基二極體之電性 18
2.2 感測原理 20
2.2.1 氮氧化物感測機制 20
2.2.2 感測動力學模式推導 20
2.2.3 感測熱力學模式推導 22
第三章 實 驗 26
3.1 藥品與材料 26
3.1.1藥品 26
3.1.2材料 27
3.1.3氣體 27
3.2.1實驗設備 28
3.2.2分析儀器 28
3.3 蕭特基二極體感測元件製備 29
3.3.1 元件結構 29
3.3.2 元件製備 29
3.4 氣體感測方法 32
3.4.1 穩態感測 32
3.4.2 暫態感測 32
3.5 分析方法 33
3.5.1 循環伏安法 33
第四章 結果與討論 41
4.1 雙硫醇單分子層分析 41
4.1.1 XRD分析 41
4.1.2 CV分析 41
4.2 元件電性分析 43
4.2.1 氣氛影響 43
4.2.2 溫度影響 44
4.3 氮氧化物感測分析 44
4.3.1 雙硫醇碳數影響 45
4.3.2 雙硫醇含浸時間影響 46
4.3.3 氣體濃度影響 47
4.3.4 溫度影響 48
4.3.5 選擇性測試 49
4.4 動力學及熱力學模型分析 49
4.4.1 動力學分析 49
4.1.2 熱力學分析 50
第五章 結論與建議 86
5.1 結論 86
5.2 建議 87
參考文獻 89
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