- 學位論文
奈米複合式普魯士藍結構之電致色變特性研究
Electrochromic Property Study of Nano-Composite Prussian Blue Structure
摘要
普魯士藍(Prussian Blue)薄膜具有特殊的光電特性，所以其被提出可應用的領域也越來越廣。目前普魯士藍類似物的相關應用包括傳統染料、薄膜電池、生物感測器、離子選擇性薄膜、電催化薄膜與電致色變材料等。由於近年能源缺乏的問題與輕薄可攜的顯示裝置最為熱門，而以普魯士藍薄膜所製成的電致色變元件(Electrochromic Device，ECD)具有節約能源的概念與色彩對比強烈等優點，完全符合這兩大發展趨勢，因此日後的發展與研究是指日可待。 目前大部份電致色變元件中的電致色變材料大多都發展成薄膜的型態。但電致色變材料是藉由導電基板傳來的電子與電解質中提供的離子來進行氧化還原反應，所以此種薄膜結構不利於離子的擴散與電子的傳遞，使得相關電致色變技術長久以來存在著反應速度緩慢與循環壽命不佳的問題。近年奈米材料科學的蓬勃發展，給予研究者新的思維與發展方向，也讓相關電致色變技術有突破性的發展。 本研究論文提出一個新的普魯士藍電致色變結構，利用散亂排列的導電奈米顆粒做為一多孔隙的導電介質，再將普魯士藍薄膜以電鍍的方式均勻的包覆在導電奈米顆粒上。此變色結構具有多孔隙的特性，可使電解質滲入整個結構中來增加彼此的接觸面積，進而提升氧化還原反應速度。而此新的結構亦具有奈米複合材料(nano-composite material)的概念，可以強化整體結構而延長循環壽命。我們稱此新的結構為奈米複合式普魯士藍結構(Nano-composite Prussian Blue，NPB)，期望其能讓電致色變技術有突破性的發展，更有機會使其達成商品化。
並列摘要
A prussian blue (PB) film possesses special photoelectric properties, and therefore it can be used in dyeing industry, thin-film battery, biosensor, electrocatalytic film, electrochromic material and so on. PB electrochromic devices (ECDs) have energy saving concept, high contrast ratio, bi-stable and many other advantages. Consequently, PB ECDs fulfill the bill of energy crisis and portable display, which are the most popular issues in nowadays. Traditional EC films were thin film structures. EC materials need electrons from conductive substrate and ions from electrolyte to redox. However, the thin film structures disadvantage the electron transmission and ion diffusion and lead to slow response time and poor durability. Recently, nano-technology brings researchers new thoughts and developments, and it makes EC technology has a substantial improvement. The thesis proposes a novel PB EC structure. We use randomly conductive nano-particles as a conductive porous template and then the PB film is electro-deposited on them. This structure has high porosity; therefore, the electrolytes can easily permeate into the whole structure to increase the reaction area and redox speed. The structure also has a concept of nano-composite material, which can strengthen the whole structure to prolong the durability. We call this novel structure as a nano-composite PB (NPB) and expect that it can bring a breakthrough of EC technology.