氧化石墨烯复合TiO_(2)-B薄膜的制备及其电致变色性能

Preparation and electrochromic properties of graphene oxide and TiO_(2)-B composite films

目前具有一维纳米结构的TiO_(2)薄膜在电致变色领域应用主要受限于材料光调制幅度小、响应时间长、循环稳定性差等缺点。为了解决上述问题,本文采用沉积法将B型二氧化钛纳米管(TiO_(2)-B)与氧化石墨烯复合,以TiO_(2)粉末为原料,采用水热法得到钛酸纳米管后,利用沉积法在氟掺杂的氧化锡玻璃(FTO)基底上制备了高透明度、大光调制范围以及优良循环性能的氧化石墨烯复合B型二氧化钛纳米管电致变色薄膜(GO/TiO_(2))。借助XRD、XPS、Raman、FESEM、HR-TEM等分析手段研究了氧化石墨烯用量对GO/TiO_(2)复合薄膜电致变色性能的影响。研究结果表明,当GO与钛酸纳米管的质量比(GO/钛酸)为7%时,GO/TiO_(2)复合薄膜离子扩散系数为1.46×10^(-8)cm^(2)/s,着色效率值为38.1cm^(2)/C,具有良好的电致变色性能。在-1.6V、633nm处,GO/TiO_(2)电致变色薄膜的光调制幅度可达77%,GO/TiO_(2)薄膜的着色和漂白时间分别为28.6s和4.8s,100次循环后的光调制幅度保持率为96.1%。

At present,TiO_(2)thin films with one-dimensional nanostructures are mainly limited in the field of electrochromic materials such as small light modulation amplitude,long response time and poor cycle stability.To solve the above problems,B-type titanium dioxide nanotubes(TiO_(2)-B)were compounded with graphene oxide by deposition method,and titanate nanotubes were obtained by hydrothermal method with TiO_(2)powder as raw material.Then,the graphene oxide composite B-type titanium dioxide nanotube electrochromic film(GO/TiO_(2))with high transparency,large light modulation range and excellent cycle performance was prepared on fluorine-doped tin oxide glass(FTO)substrate by deposition method.XRD,XPS,Raman,FESEM and HR-TEM were used to study the effect of graphene oxide content on the electrochromic properties of GO/TiO_(2)composite films.The results showed that when the mass ratio of GO to titanate nanotubes was 7%,the ion diffusion coefficient of GO/TiO_(2)composite film was 1.46×10^(-8)cm^(2)/s and the coloring efficiency was 38.1cm^(2)/C,indicating good electrochromic properties.At-1.6V and 633nm,the light modulation amplitude of GO/TiO_(2)electrochromic film can reach 77%,the coloring and bleaching time of GO/TiO_(2)film were 28.6s and 4.8s,respectively,and the light modulation amplitude retention rate after 100 cycles was 96.1%.