通過硒化ZnO奈米線形成ZnO/ZnSe核殼結構作為催化劑進行壓電光催化降解

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研究生：	林傳皓 Lin, Chuan-Hao
論文名稱：	通過硒化ZnO奈米線形成ZnO/ZnSe核殼結構作為催化劑進行壓電光催化降解 Piezo-photocatalytic Degradation by Selenizing ZnO Nanowires to Form ZnO/ZnSe Core-shell Nanostructures as Catalysts
指導教授：	陳力俊 Chen, Lih-Juann
口試委員:	闕郁倫 Chueh, Yu-Lun 闕郁倫 Chueh, Yu-Lun
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：	2024
畢業學年度：	112
語文別：	英文
論文頁數：	91
中文關鍵詞：	氧化鋅、壓電、降解、光催化
外文關鍵詞：	ZnO, Peizoelectric, Degradation, Photocatalytic
相關次數：	點閱：72 下載：0
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近年來，隨著環保意識的抬頭，如何乾淨並有效的處理各種汙染物也成為一個很重要的議題，而壓電光催化降解是現在備受關注的一種處理方式。本研究針對紡織工業中常見的一種汙染物—剛果紅，使用壓電光催化的方式來對它進行降解，除此之外，透過type-II的ZnO/ZnSe核殼複合結構，來提升電子電洞對的分離效果，以進一步提升壓電光降解的效率。
本研究通過固液氣法並搭配化學氣相沉積的技術，在成長方向(100)的p型矽基板上沉積ZnO奈米線，接著透過表面硒化的方式，將表層的ZnO硒化成ZnSe，以形成type-II的ZnO/ZnSe核殼複合結構。其中研究了在不同的硒化溫度下形成的ZnO/ZnSe核殼複合結構，分析它們壓電光催化降解剛果紅的能力。
結果顯示，隨著硒化溫度的提升，ZnSe的厚度也跟著變厚，使電子跟電洞的分離效果變好，讓壓電光催化降解的效率因而隨之提升。而在攝氏225 度的情況下硒化ZnO奈米線，可以達到最好的結果，將其與未經過硒化的ZnO奈米線相比，可以提升約287 % 的壓電光催化降解效率。然而，在硒化溫度大於攝氏225度的情況下，ZnSe的厚度會變得太厚導致材料沒有辦法有效的吸收光並將電子與電洞進行分離，使其壓電光催化降解效率反而下降。

With the rise of environmental awareness, finding a clean and effective treatment of various pollutants has become an important issue in recent years. Piezo-photocatalytic degradation has gained significant attention as a method for addressing this concern. The present study focuses on a common pollutant in the textile industry, Congo Red, and uses a piezo-photocatalyst to degrade it. Additionally, we enhance the separation efficiency of electron-hole pairs by forming a type-II ZnO/ZnSe core-shell structure, thereby further improving the efficiency of piezo-photocatalytic degradation.
In the present study, ZnO nanowires were fabricated using a combination of the vapor-liquid-solid method and the chemical vapor deposition technique. Subsequently, the ZnO nanowires were selenized, and the surface was converted into ZnSe to form a type-II ZnO/ZnSe core-shell structure. Afterwards, we measured the degradation efficiency of Congo Red with ZnO/ZnSe core-shell structures that were selenized under different temperatures.
The results indicate that with increasing selenization temperature, the thickness of ZnSe gradually increases, improving the efficiency of separation of electron-hole pairs and thus enhancing the efficiency of piezo-photocatalytic degradation. In particular, selenizing ZnO nanowires at 225 °C yielded the best result, with a 287% increase in piezo-photocatalytic degradation efficiency compared to untreated ZnO nanowires. However, at selenization temperatures above 225 °C, the thickness of ZnSe becomes excessive, decreasing light absorption and preventing the separation of electron-hole pair, resulting in a decrease in piezo-photocatalytic degradation efficiency.

Abstract------------------------------------------------I
摘要------------------------------------------------------III
Contents------------------------------------------------------IV
致謝------------------------------------------------------------VII
Chapter 1 Introduction------------------------------------------1
1    Research Background------------------------------------1
1.1    Wastewater Treatment Issue------------------------------1
1.2    Degradation Methods of Azo Dyes------------------------3
1.3    Introduction of Congo Red------------------------------5
2    Nanomaterials------------------------------------7
2.1    Classification of Nanomaterials------------------------7
2.2    Synthesis Methods of Nanomaterials------------------------9
2.3    Vapor-Liquid-Solid Growth Method------------------------10
3    Core-shell Structures------------------------------------13
3.1    Overview------------------------------------------13
4    Photocatalyst------------------------------------15
4.1    Overview------------------------------------------15
4.2    Photocatalytic Degradation Mechanism------------------17
5    Piezo-catalyst------------------------------------19
5.1    Overview------------------------------------------19
6    Piezo-photonic effect------------------------------21
6.1    Enhanced Catalysis Reaction by Piezo-phototropic Effect---21
7    Material Selection------------------------------------------23
7.1    Properties of ZnO------------------------------------23
7.2    Properties of ZnSe------------------------------------25
7.3    Properties of ZnO/ZnSe------------------------------------27
8    Motivation------------------------------------------29
Chapter 2 Experimental Section------------------------------------31
1     Experimental Procedures------------------------------31
1.1    Synthesis of ZnO Nanowires------------------------------32
1.2    Synthesis of ZnO/ZnSe Core-shell Structures------------34
1.3    Congo Red Degradation Efficiency Measurement------------36
2     Experimental Instruments and Equipments------------------38
2.1    Scanning Electron Microscope (SEM)------------------38
2.2    Energy-Dispersive X-ray Spectroscope (EDS)------------40
2.3    X-Ray Diffractometer (XRD)------------------------41
2.4    Photoluminescence (PL) Spectroscope------------------43
2.5    Ultraviolet-Visible Spectroscopy (UV-Vis)------------------44
2.6    Transmission Electron Microscope (TEM)------------46
2.7    Electron Beam Evaporation System (E-gun)------------------48
2.8    Three-zone Horizontal Tube Furnace------------------50
Chapter 3 Results and Discussion------------------------------52
1 Characteristics of ZnO Nanowires------------------------52
1.1 SEM Observation------------------------------------52
1.2 EDS Analysis------------------------------------53
1.3 TEM Observation and Analysis------------------------54
2 Characteristics of ZnO/ZnSe Core-shell Structures------------56
2.1 SEM Observation and EDS Analysis------------------56
2.2 XRD Analysis------------------------------------58
2.3 TEM Observation and Analysis------------------------60
2.4 UV-vis Analysis------------------------------------67
2.5 PL Analysis------------------------------------68
3 Piezo-Photocatalytic Degradation------------------------69
4 Degradation Efficiency Comparison------------------------77
4 Feasibility of Commercialization of Piezo-photocatalytic Degradation by ZnO/ZnSe Core-shell Structures------------78
Chapter 4 Summary and Conclusions------------------------81
Chapter 5 Future Prospects---------------------------------------83
1 Piezo-photocatalytic Degradation Using Hollow ZnO/ZnSe Heterostructures Created by KOH Etching------------------------83
2 Plasmonic Enhancement for Piezo-photocatalytic Degradation of Dye by LSPR Effect------------------------------------84
References------------------------------------------86
                                

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