Polyaniline (PANI) films and its electrochromic devices based on various porous substrates were obtained by electrochemical deposition. The pore size distribution of the porous substrate has shown important influence on the infrared emissivity variation (∆ε) of the device. Morphology and structure of PANI were characterized by scan electronic microscopy (SEM) images and Fourier transform infrared spectra (FTIR). SEM images present the morphology difference of PANI on different substrates, which suggest that large pores will prevent PANI particles from forming orderly and compactly films. FTIR spectrum indicates that pore size of substrates affects the orientation of PANI chains. Furthermore, electrochemical properties and stability of PANI films were analyzed by cyclic voltammetry (CV) curves. And the CV curve revealed that the generation of irreversible degradation products is the reason for poor stability of PANI films. Finally, greatly improved ∆ε of 0.559 in 3–5 μm waveband and 0.39 in 8–14 μm waveband is achieved by choosing a small pore substrate.

中文翻译：

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多孔基质对基于聚苯胺电致变色器件的可变红外发射率的影响

通过电化学沉积获得了基于各种多孔基材的聚苯胺（PANI）薄膜及其电致变色器件。多孔基材的孔径分布对红外发射率变化（∆ε）的设备。通过扫描电子显微镜（SEM）图像和傅立叶变换红外光谱（FTIR）表征了PANI的形态和结构。SEM图像显示了不同基材上PANI的形态差异，这表明大孔会阻止PANI颗粒有序而致密地形成薄膜。FTIR光谱表明底物的孔径会影响PANI链的方向。此外，通过循环伏安法（CV）曲线分析了PANI膜的电化学性能和稳定性。CV曲线表明不可逆降解产物的产生是PANI膜稳定性差的原因。最后，通过选择小孔基质，可以大大提高3–5μm波段中的0.559和8–14μm波段中的0.39的∆ε。