以水熱法製備氧化鎢奈米線網狀結構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，其中以大比表面積的氧化鎢奈米柱與奈米線最受到矚目。然而為了要進一步地提升氧化鎢電致變色薄膜的光學性能，所製備出來的奈米結構必須具有多孔洞、高附著力的特性。

在本論文中，我們以氯化鎢為前驅物並利用水熱法製備多孔洞的氧化鎢奈米線網狀結構，另外藉由調整前驅物濃度以及水熱處理的時間，我們可以找出一個最適當的水熱環境，在此環境中生長的奈米線網狀結構，具有最高的著退色透射率變化比(57%)與最短的著退色切換時間(tb=7s, tc=21s)且其變色效率可高達120.3 cm2 C-1。最後，我們也根據在實驗中所觀察到的現象，對其奈米線網狀結構的成長機制做了深入的探討。

In recent years, nanostructured materials applied to serve as electrochromic device have been widely researched. Among them, WO3 nanorods and nanowires synthesized by hydrothermal method have attracted much attention due to the large specific surface area. However, in order to further improve optical performances of WO3 electrochromic film, the as-grown nanostructures must have the characteristics of highly porous morphology and good adhesion to substrate.

In this thesis, we use tungsten hexachloride as precursor to synthesize the highly porous WO3 nanowire networks by hydrothermal method. Besides, we can get a most appropriate hydrothermal environment in which nanowire networks grow with highest transmittance contrast(57%), shortest switching time(tb=7s, tc=21s) and its color efficiency is up to 120.3 cm2 C-1 during the coloration/ bleaching process. At last, we also deeply discuss the growth mechanism of the nanowire networks according to the phenomenon observed in the experiments.