陽極氧化鋁模板法製備一維金屬與金屬氧化物奈米結構陣列及其性質研究

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Title:	陽極氧化鋁模板法製備一維金屬與金屬氧化物奈米結構陣列及其性質研究
Authors:	黃伯彥;Huang,Bo-yan
Contributors:	化學工程與材料工程學系
Keywords:	陽極氧化鋁模板;銅金屬奈米線;電化學沉積法;場發射性質;銅金屬奈米線氧化機制;雙晶結構;AAO;copper nanowire;electrodeposition;Field emission;copper oxide;twinned copper nanowire
Date:	2013-08-27
Issue Date:	2013-10-08 15:07:40 (UTC+8)
Publisher:	國立中央大學
Abstract:	本研究利用陽極氧化鋁奈米模板結合電化學沉積法，成功地製備出長度可調控的一維銅金屬奈米線與奈米管。經由場發射性質量測可得知銅金屬奈米線與奈米管皆具有優異的場發射性質，其啟動電場分別為 0.283 V/μm 與 0.367 V/μm。除此之外，我們發現銅金屬奈米線的場增強因子(β)的數值比銅金屬奈米管大，推測造成此現象的原因為遮蔽效應的影響。本研究利用陽極氧化鋁模板結合脈衝電電鍍法成功的製備出具有雙晶結構的一維銅金屬奈米線。此銅金屬奈米線的直徑大約為 50 奈米，且深寬比可高達 1000。此外，我們可藉由調整脈衝電電鍍的條件來簡單地調控銅金屬奈米線中的雙晶密度。本研究發現，若將自製具有 50 奈米孔洞直徑的陽極氧化鋁模板結合脈衝電流進行電鍍，可鍍製直徑約為 50 奈米且具有雙晶結構的一維銅金屬奈米線，其奈米線的深寬比可高達 1000，本研究將調整各種實驗參數，如電流形式、電壓與電極間距等等，並利用 TEM 觀察在不同電鍍參數下的雙晶晶面密度的變化。本研究將銅金屬奈米線與奈米管在 250 0 C 的大氣氛圍下進行不同熱氧化時間的處理，並且利用 SEM、TEM、SAED 與 EDS 對氧化銅奈米結構的形貌、晶體結構與生成機制進行有系統性的研究 In this study, we have demonstrated that length-tunable copper nanowires and nanotubes were successfully produced by using the anodic aluminum oxide (AAO) nanotemplate combined with the electrodeposition process. Field emission measurements showed that the copper nanowires and nanotubes have excellent field emission properties. The turn-on fields of Cu nanowire and nanotube are 0.283 V/μm and 0.367 V/μm, respectively. Moreover, the field enhancement factor(β) of Cu nanowires was found to be larger than that of Cu nanotubes, the result might be attributed to the so-called screen effect. By combining the AAO template and pulse electrodeposition technique, single crystal Cu nanowires with twinned structures were successfully fabricated in this study. The diameter of twinned Cu nanowires was about 50 nm, and their aspect ratio can be reached to as high as 1000. Furthermore, the density of twins formed in the Cu nanowires can be readily tuned and controlled by adjusting the pulse electrodeposition conditions. In this work, oxidation of Cu nanowires and nanotubes was carried out at 250 ℃ for different time in air. The morphology, crystal structure, and formation mechanism of the Cu oxide nanostructures formed have been systematically investigated by SEM, TEM, SAED, and EDS analyses.
Appears in Collections:	[National Central University Department of Chemical & Materials Engineering] Electronic Thesis & Dissertation

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