Simultaneous Enhancement of Electrochromic Performance and Infrared Modulation in PANI-TiO 2 Composites

作者：Longlong Qin, Liang Liu, Linlin Wu, Shengxiang Huang, Xiaohui Gao, Lianwen Deng · 发表于：ACS Applied Optical Materials · 年份：2025 · DOI：10.1021/acsaom.5c00236 · 被引用次数：3 · 研究领域：Conducting polymers and applications、Transition Metal Oxide Nanomaterials、Gas Sensing Nanomaterials and Sensors

Polyaniline (abbreviated as PANI), a promising electrochromic material, exhibits broad optical tunability and rapid switching time. However, the prolonged preservation of its leucoemeraldine state is hindered by the high thermodynamic stability of its emeraldine salt state. In this work, density functional theory calculation reveals that titanium oxide doping substantially elevates both the highest occupied molecular orbital and lowest unoccupied molecular orbital energy levels in oxidized PANI-TiO 2 composites, facilitating electron excitation and polaron formation. Coupled with expanded electrochemical active surface areas and enhanced ion transport efficiency, the synthesized PANI-TiO 2 composite films achieve an optical contrast of 73.8%. The coloration and bleaching time of PANI-TiO 2 composites was determined to be 0.46 and 0.94 s, respectively, significantly surpassing those of pure PANI films. Moreover, the composites demonstrate exceptional infrared modulation capabilities, exhibiting an emissivity variation (Δε) of 0.61 under low-voltage stimuli (≤1 V). These findings provide a fundamental insight into the structural engineering strategies for advanced electrochromic materials.