研究生: |
林志誠 Lin, Chih-Cheng |
---|---|
論文名稱: |
以脈衝式電流電化學沉積法成長氧化鋅奈米柱之研究 Growth of ZnO Nanorods using Pulsed Current Electrolysis |
指導教授: |
吳季珍
Wu, Jih-Jen |
學位類別: |
碩士 Master |
系所名稱: |
工學院 - 化學工程學系 Department of Chemical Engineering |
論文出版年: | 2007 |
畢業學年度: | 95 |
語文別: | 中文 |
論文頁數: | 97 |
中文關鍵詞: | 脈衝式電流電化學沉積法 、氧化鋅奈米柱 、貴重金屬薄層 |
外文關鍵詞: | noble metal layer, ZnO nanorod, pulsed current electrolysis |
相關次數: | 點閱:161 下載:2 |
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本研究利用脈衝式電流電化學沉積法,於導電基板上成長氧化鋅奈米柱,探討反應物濃度、脈衝電流密度、脈衝時間與反應溫度等成長條件,對於氧化鋅奈米柱成長的影響。並進一步研究於基板表面預鍍Au和Pt薄層對於氧化鋅晶體成長之影響。相較於無貴重金屬層之基板,在具貴重金屬薄層之基板上沉積氧化鋅奈米柱有明顯地改善。由X光繞射圖顯示,在預鍍Au層之ITO上所成長的氧化鋅奈米柱具有(002)晶面的優勢位向。透過穿透式電子顯微鏡影像(TEM)分析,可知氧化鋅奈米柱是屬於單晶的wurtzite結構,且沿c軸方向成長。而經由高解析TEM結果分析得知,Au 層和氧化鋅奈米柱之間沒有磊晶成長關係。光激發光譜圖說明本研究所成長之氧化鋅奈米柱包含了強紫外光放射峰、藍光放射峰以及幾乎可忽略之綠光放射峰。經由循環伏安圖與電極電位得知,Au層可促使基板表面產生高濃度的氫氧根離子,進而增加氧化鋅在基板表面的成核密度。
ZnO nanorods have been grown on the conducting substrates using pulsed current electrolysis (PCE) method. The effects of the reaction concentration, pulsed current density, pulsed length and reaction temperature on the nanorod growth have been investigated in this study. In addition, the influences of noble metal layers on ZnO-nanorod growth have been studied as well. The improvement of the ZnO nanorod growth is achieved on the noble metal pre-coated substrates compared to those grown on the bare substrates. (002) preferential orientation is observed in the XRD pattern of the ZnO nanorods grown on the Au-coated ITO substrate. TEM analyses reveal that nanorods are single crystalline wurtzite structure and they grow along the c-axis direction. HRTEM analyses indicate that there is no epitaxial relationship between the Au layer and ZnO nanorod . Strong UV emission, blue band emission and neglected green band emission are observed in the PL spectra of the ZnO nanorods. CV analyses and the electrode voltage show that Au layer can produce the high concentration of the OH- ion on the surface to enhance the ZnO nucleation.
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