铁氰化镍电致变色器件的制备与性能研究

Preparation and Properties of Electrochromic Devices Based on Nickel Ferricyanide Film

由于具备氧化还原的可逆性及氧化还原过程中伴随不同的颜色变化,普鲁士蓝及其类似物在电致变色领域引起了广泛的关注。因此,采用一种简单高效的直接沉淀法制备出纳米铁氰化镍粉体,并通过旋涂法制备了铁氰化镍薄膜。为了得到更均匀牢固的薄膜,在悬涂液中加入3,4-乙烯二氧噻吩单体的聚合物(PEDOT:PSS)或聚乙烯吡咯烷酮(PVP),研究了不同聚合物对成膜均匀性及其电致变色性能的影响。将薄膜组装成器件,考察了透过率和响应时间等电致变色性能。结果表明:所制备的铁氰化镍粉末达到了纳米级别,在400nm波长时,基于铁氰化镍PEDOT:PSS复合材料薄膜和基于铁氰化镍PVP复合材料薄膜两种器件的调制幅度达到最大值,分别为15%和12%,前者的着色时间和褪色时间分别为4和21s;后者的着色时间和褪色时间分别为51和36s。

Prussian blue and its analogues have attracted wide attention in electrochromic field due to their reversibility of redox and different color changes during redox process.This papers reports a simple and efficient method to get nickel iron cyanide powder by direct precipitation method and thin film on ITO substrate by spin coating.In order to get a more uniform and firm film,we added PEDOT:PSS or PVP into the suspension and studied the influence of different polymers on the film uniformity and electrochromic properties.The films are assembled into electrochromic(EC)device and the electrochromic performance include transmittance spectra and response time are tested.The results show that the prepared nickelhexacyanoferrate powder reaches nanometer level.The modulation amplitudethe of devices based nickel ferricyanide with PEDOT:PSS and nickel ferricyanide with PVP both reach largest at 400 nm(15% vs 12%).Besides,the colored time and bleached time of device based nickel ferricyanide with PEDOT:PSS is 4 sand 21 sand based nickel ferricyanide with PVP is 51 sand 36 s.