臺灣博碩士論文加值系統

金屬氧化物半導體(MOS)近年來成為受歡迎的氣體感測器的感材，這些材料具有易於製造、成本低和高敏度等特點，因此被廣泛應用於氣體感測領域。本篇研究使用水熱法成功合成出氫氧化鎳奈米片，在經過鍛燒及使用1/8 (Polyethylenimine,PEI)震盪後合成出p型氧化鎳墨水奈米片。研究發現，氧化鎳奈米片在工作溫度210℃下有最好的二氧化氮(NO2)氣體響應，其偵測限可達到10ppb等級。為了提高對於二氧化氮之響應，分別摻雜Au、Pt和Pd等貴金屬。結果表明四種氧化鎳感材皆對二氧化氮氣體產生氣體選擇性。其中又以Pt-NiO有最高的選擇性及響應。接著利用XRD和XPS技術確認其晶體結構和表面化學狀態。接著近一步驗證氧化鎳之半導體特性，在照射365nm的紫外光照射下，氧化鎳能夠產生電子電洞對進而產生活性氧分子(ROS)，進而分解亞甲基藍分子(MB)。為了提高光催化效果，本篇研究中也在氧化鎳裡摻雜不同金屬，在摻雜銅及鐵的組別當中有效的提升光催化效果，也證實了摻雜金屬能夠減緩電子電洞的複合進而提高整體光催化的效果。本研究成功合成出具有半導體特性及氣體感測性能的氧化鎳奈米片，這些結果有望促進金屬氧化物半導體材料的發展，為應用於光催化降解和氣體感測等方面提供了重要的參考和啟示。

In this study, nickel oxide nanosheets were synthesized via a hydrothermal method and their gas sensing and photocatalytic properties were investigated. The nanosheets exhibited excellent gas sensing capabilities, specifically in detecting nitrogen dioxide (NO2) at low temperatures with high sensitivity. Compared to other metal oxide semiconductors, nickel oxide operated at lower temperatures, leading to energy and cost savings. Doping with Au, Pt, and Pd enhanced the response to NO2, with Pt doping showing improved selectivity in mixed gas environments. The crystal structure and surface chemistry of the nanosheets were confirmed using XRD and XPS techniques. Additionally, the nickel oxide nanosheets demonstrated remarkable photocatalytic performance, effectively decomposing methylene blue (MB) molecules under UV light. Doping with different metals, particularly copper and iron, further improved the photocatalytic efficiency by reducing electron-hole recombination. Overall, this study successfully synthesized nickel oxide nanosheets with exceptional photocatalytic and gas sensing properties, contributing to the development of metal oxide semiconductor materials for applications in photocatalysis and gas sensing.

中文摘要 i
Abstract ii
致謝 v
目錄 vi
圖目錄 ix
表目錄 xiii
第一章 研究背景介紹 1
1.1 金屬氧化物半導體 1
1.1.1 n型金屬氧化物半導體 2
1.1.2 p型金屬氧化物半導體 3
1.1.3 氫氧化鎳(Nickel Hydroxide) 4
1.1.4 氧化鎳(Nickel Oxide) 5
1.2 氧化鎳之氣體感測 11
1.2.1 摻雜貴金屬 11
1.2.2 p-n接面 12
1.3 噴印墨水 13
1.4 二氧化氮 14
第二章 研究動機 15
第三章 材料與實驗方法 16
3.1 Materials 16
3.2 Equipment 17
3.3實驗方法 18
第四章 結果與討論 23
4.1 氫氧化鎳奈米片 23
4.1.1 不同水熱溫度調控 23
4.1.2 不同PVP ink濃度調控 25
4.1.3 不同聯氨濃度調控 27
4.1.4不同水熱時間調控 29
4.2氧化鎳奈米片 32
4.2.1 不同之鍛燒溫度 32
4.2.2 氧化鎳之XPS分析 35
4.2.3 氧化鎳之能隙分析 37
4.2.4 氧化鎳之TGA分析 38
4.2.4 氧化鎳之BET分析 39
4.3 MB光催化 40
4.3.1 不同聯氨濃度之氧化鎳MB光催化 40
4.3.2 不同照光波長之氧化鎳MB光催化 42
4.3.3 不同鍛燒溫度之氧化鎳MB光催化 44
4.3.4不同金屬摻雜之氧化鎳MB光催化 45
4.3.5 氧化鎳光催化機制 47
4.4 氧化鎳照光還原金/銀 51
4.5氣體感測分析 53
4.5.1氧化鎳氣體感測 53
4.5.2氧化鎳氣體機制 55
第五章 總結 57
REFERENCE 58

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