水熱法合成氧化鎢奈米束狀結構應用於可撓式基板之電致變色元件研究

Abstract

近年來，奈米結構材料應用於電致變色元件上已被廣泛的研究，其中具備有高比表面積的一維奈米結構氧化鎢最受到矚目。 本論文實驗過程中，初始先以水熱法完成氧化鎢奈米束狀結構製備，後續搭配電泳法將水熱合成完之氧化鎢產物沉積於可撓式基板上。製程中調整水熱前驅液濃度、反應時間及退火處理等實驗參數，進而找出最佳化製程條件，將氧化鎢奈米束狀結構應用於可撓式電致變色元件研究。 實驗結果顯示，在鎢離子前驅液濃度5mM、水熱反應時間12h及溫度180oC之水熱條件下，所合成之氧化鎢奈米束狀結構具備有多孔隙外形和八面體結晶性，將其應用於可撓式電致變色元件，可呈現出較佳著/褪色穿透率變化 (44.1%)、最短著/褪色切換響應時間 (著色9.5秒和褪色22秒)、優異的著色效率變化 (89.8 cm2 C-1)和化學穩定性。

In recent years, nano-structured materials applied to serve as electrochromic device have been widely researched. Among them, 1D nano-structured WO3 have attracted much attention due to the large specific surface area. In this thesis, we introduce the experiment process. First of all, the production of WO3 nanobundles structure is synthesized by hydrothermal method. Next, the electrophoresis deposition method is used to deposit hydrothermally synthesized WO3 production on flexible substrate. By adjusting precursor solution concentration, hydrothermal time, and annealing process in the process, we can find the optimized process condition and apply the WO3 nanobundles structure to the research of flexible electrochromic device. As the experimental results, in the hydrothermal condition of the tungsten ion precursor solution concentration 5mM, hydrothermal time 12h, and hydrothermal temperature 180oC, the synthesized WO3 nanobundles structure have highly porous morphology and crystalline of octahedral. As the above structure applies to the flexible electrochromic device, it shows better transmittance difference (44.1%), the shortest switching response time (9.5 and 22 sec for colored and bleached, respectively), excellent color efficiency (89.8 cm2 C-1), and chemical stability.