Chen Duan, Tan Hao, Xu Tianyi, Wang Wei, Chen Hezhang, Zhang Jie
Key Laboratory of Theoretical Organic Chemistry and Functional Molecule, Ministry of Education, School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan 411201, China.
College of Chemistry and Chemical Engineering, Jinggangshan University, Ji'an, Jiangxi 343009, China.
ACS Appl Mater Interfaces. 2021 Dec 8;13(48):58011-58018. doi: 10.1021/acsami.1c17897. Epub 2021 Nov 19.
Micro-nanofabrication of conductive polymers (CPs) with functional structures is in great demand in organic electronic devices, micro-optics, and flex sensors. Here, we report the fabrication of micropatterned poly(3,4-ethylenedioxythiophene) (PEDOT) and its applications on flexible electrochromic devices and tunable diffractive optics. The localized electropolymerization of 3,4-ethylenedioxythiophene at the electrode/agarose gel stamping interface through an electrochemical wet stamping (E-WETS) technique is used to fabricate PEDOT with functional microstructures. PEDOT microdots, micro-rectangles, and interdigitated array microelectrodes are fabricated with submicron tolerance and ∼2 μm smallest feature size. Furthermore, the flexible PEDOT electrochromic devices consisting of the logo of Xiamen University are fabricated with a reversible switch of absorptivity. The improved optical and coloration-amperometric responses of electrochromism are demonstrated because of the enhanced charge transport rate of the micropatterned PEDOT. The electrochromism of the 2D PEDOT micropatterns is further used as a binary diffractive optical element to modulate the intensity and efficiency of diffracted 2D structural light because of the switchable absorptivity during doping and dedoping processes. When the potential is switched from 1 to -1 V to tune the absorptivity at ∼600 nm from low to high, the intensity of zero-order diffraction light spot decreases with the intensity of other order diffraction light spots increasing dramatically. The results demonstrate that E-WETS provides an alternative method for the fabrication of CPs with functional micro-nanostructures. The electrochemical tunable diffraction with high reversibility and fast response is of potential applications in micro-optics and flex sensors.
具有功能结构的导电聚合物（CPs）的微纳制造在有机电子器件、微光学和柔性传感器中有着巨大需求。在此，我们报道了微图案化聚（3,4-乙撑二氧噻吩）（PEDOT）的制备及其在柔性电致变色器件和可调衍射光学器件上的应用。通过电化学湿法压印（E-WETS）技术在电极/琼脂糖凝胶压印界面处对3,4-乙撑二氧噻吩进行局部电聚合，用于制备具有功能微结构的PEDOT。制备出了具有亚微米公差和最小特征尺寸约为2μm的PEDOT微点、微矩形和叉指阵列微电极。此外，制备了由厦门大学标志组成的柔性PEDOT电致变色器件，其具有吸收率的可逆切换。由于微图案化PEDOT的电荷传输速率提高，展示了电致变色改善的光学和显色电流响应。二维PEDOT微图案的电致变色因其在掺杂和去掺杂过程中可切换的吸收率，进一步用作二元衍射光学元件来调制衍射二维结构光的强度和效率。当电位从1V切换到-1V以将约600nm处的吸收率从低调到高时，零级衍射光斑的强度降低，而其他级衍射光斑的强度急剧增加。结果表明，E-WETS为制备具有功能微纳结构的CPs提供了一种替代方法。具有高可逆性和快速响应的电化学可调衍射在微光学和柔性传感器中具有潜在应用。
