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研究生：	蔣昆憲 Jiang, Kun-Sian
論文名稱：	鈦擴張網基板上沉積氧化物電紡奈米纖維及其電致變色之研究 Electrospun Metal Oxide Nanofibers onto Titanium Expanded Mesh for Electrochromic Applications
指導教授：	郭昌恕 Kuo, Chang-Shu
學位類別：	碩士 Master
系所名稱：	工學院 - 材料科學及工程學系 Department of Materials Science and Engineering
論文出版年：	2013
畢業學年度：	101
語文別：	英文
論文頁數：	88
中文關鍵詞：	電致變色、電化學沉積、電紡絲、二氧化鈦氧化鎢、鈦擴張網
外文關鍵詞：	Electrochromic, Electrodeposition, Electrospinning, Nanofibers, Titanium oxide, Tungsten oxide, Titanium expanded meshes
相關次數：	點閱：57 下載：0
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二氧化鈦奈米纖維已經成功地利用電紡絲技術沉積於鈦擴張網上，其中鈦擴張網作為取代銦錫氧化物的基板。藉由高分子輔助配方製備的二氧化鈦奈米纖維具有隨機分佈，奈米尺度下的光散射行為。其中，電紡絲與鈦網的附著力藉由在鈦網製作二氧化鈦預製層及其他方法研究探討其影響。在利用電紡絲方法將二氧化鈦奈米纖維沉積於鈦網上後，應用電化學沉積方法將氧化鎢沉積於二氧化鈦奈米纖維上，形成高光學對比可應用於電致變色的核殼結構狀二氧化鈦-氧化鎢奈米複合纖維。在用電化學方法沉積氧化鎢於二氧化鈦奈米纖維時，氧化鎢會因與導電鈦網不同距離而呈現不均勻的分佈。為了得到均勻且一致的氧化鎢殼層，此研究檢視不同電壓下直流電與交流電的電鍍結果。最後，此研究中使用了三種不同金屬線與孔洞比例的鈦網來做為電致變色材料之基板，審視其電致變色性能的影響。

Titania nanofibers were successfully electrospun onto the titanium expanded meshes, which served as the replacement of ITO substrates. Randomly deposited titania nanofibers from the polymer-assisted electrospinning were conducted for the fabrication of the nano-scaled fiber scaffolds with light scattering behavior. The adhesion between titania nanofibers and the titanium meshes was carefully investigated via the prefabricated layer on titanium meshes and other approaches. Titanium meshes deposited with electrospun titania nanofibers were then electrodeposited with tungsten oxide as the conformal outer layers. Obtained TiO2/WO3 core-sheath nanofibers exhibited the high optical density as the electrochromic device. During the electrodeposition of WO3, it showed the deposition distribution as a function of distance to the conductive titanium meshes. For uniform and consistence WO3 outer layers, the electrodepositions were examined under the different applied voltages in both DC and AC voltages. Finally, three titanium meshes with different metal/hole ratios with WO3-coated titania nanofibers were investigated in their electrochromic performance.

Abstract	I
摘要	II
Acknowledgement	III
Contents	IV
List of Tables	VI
List of Illustrations	VII
Chapter1 Introduction	1
1-1 Transparent Conductive Substrate	1
1-1-1 Transparent Conductive Oxide	1
1-1-2 Transparent Conductive Oxide Free Electrode Materials	2
1-2 Titanium Meshes	6
1-3 Titanium Dioxide	8
1-3-1 Crystal Structure and Properties	8
1-3-2 TiO2 Layer	10
1-4 Tungsten Oxide	11
1-4-1 Introduction and Preparation Methods	11
1-4-2 Structure of Tungsten Oxide	12
1-5 Electrospun Nanofibers	16
1-5-1 Sol-gel Method	16
1-5-2 Electrospinning Titanium Dioxide Nanofibers	17
1-6 Electrochromism	20
1-6-1 Chromism	20
1-6-2 Electrochromic Materials	21
1-6-3 Electrochromic Devices (ECDs)	26
1-7 Motivation	29
Chapter2 . Experimental	30
2-1 Materials and Experimental Instruments	30
2-1-1 Materials	30
2-1-2 Experimental Instruments	31
2-1-3 Electrospinning Apparatus	31
2-2 Analytical Instruments	33
2-2-1 Scanning Electron Microscopy ( SEM )	33
2-2-2 UV-vis Spectrometer ( UV-vis )	34
2-2-3 X-ray Diffraction ( XRD )	35
2-2-4 Potentiostat ( Autolab 128 N )	35
2-3 TiO2 Nanofibers	37
2-3-1 TiO2 Thin Blocking Layers	37
2-3-2 Prefabricated Layers	38
2-3-3 Electrospinning of TiO2 Nanofibers	38
2-3-4 Calcination	40
2-3-5 Surface Modification by TiCl4	40
2-4 Electrodeposition of WO3-Coated TiO2 Nanofibers	41
Chapter3 Results and Discussion	43
3-1 Titanium Expanded Meshes	43
3-1-1 Optical and Electricial Properties	43
3-2 Adhesion between TiO2 Nanofibers and Titanium Expanded Mesh	46
3-2-1 Prefabricated Layer	46
3-2-2 Hot Pressing	49
3-3 As-spun and Calcined TiO2 Nanofibers	53
3-3-1 Morphologies	53
3-3-2 Crystal Structure	56
3-3-3 Specific Surface Areas and Pore Sizes	58
3-4 Electronic Path of Horizontal electrodeposition	60
3-4-1 Normal/Pluse-Reverse Electrodeposition	62
3-4-2 Relation of Electrodeposition Time and Diameter of WO3-Coated TiO2 Nanofibers at Different Distance	68
3-5 WO3-Coated TiO2 Nanofibers	72
3-5-1 Morphologies	72
3-5-2 Crystal Structure	74
3-6 Electrochromic Properties of WO3-Coated TiO2 Nanofibers	76
3-6-1 UV-vis Reflection Spectra in Transmission Mode	76
3-6-2 Electrochromic performance of WO3-coated TiO2 nanofibers based on three type titanium meshes.	78
Chapter4 Conclusions	83
Chapter5 References	84

                                    

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校內：2023-08-30公開
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