Conformal and ultrathin coating of highly conductive PEDOT:PSS on hydrophobic uneven surfaces is essential for resistive-based pressure sensor applications. For this purpose, a water-based poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) solution was successfully exchanged to an organic solvent-based PEDOT:PSS solution without any aggregation or reduction in conductivity using the ultrafiltration method. Among various solvents, the ethanol (EtOH) solvent-exchanged PEDOT:PSS solution exhibited a contact angle of 34.67°, which is much lower than the value of 96.94° for the water-based PEDOT:PSS solution. The optimized EtOH-based PEDOT:PSS solution exhibited conformal and uniform coating, with ultrathin nanocoated films obtained on a hydrophobic pyramid polydimethylsiloxane (PDMS) surface. The fabricated pressure sensor showed high performances, such as high sensitivity (−21 kPa⁻¹ in the low pressure regime up to 100 Pa), mechanical stability (over 10,000 cycles without any failure or cracks) and a fast response time (90 ms). Finally, the proposed pressure sensor was successfully demonstrated as a human blood pulse rate sensor and a spatial pressure sensor array for practical applications. The solvent exchange process using ultrafiltration for these applications can be utilized as a universal technique for improving the coating property (wettability) of conducting polymers as well as various other materials.

疏水性不平坦表面上的高导电性PEDOT：PSS的保形和超薄涂层对于基于电阻的压力传感器应用至关重要。为此，使用超滤方法成功地将水基聚（3,4-乙撑二氧噻吩）聚苯乙烯磺酸盐（PEDOT：PSS）溶液交换为有机溶剂基PEDOT：PSS溶液，而没有任何聚集或电导率降低。在各种溶剂中，乙醇（EtOH）溶剂交换的PEDOT：PSS溶液的接触角为34.67°，远低于水性PEDOT：PSS溶液的96.94°的接触角。经过优化的基于EtOH的PEDOT：PSS溶液具有保形且均匀的涂层，并且在疏水性金字塔形聚二甲基硅氧烷（PDMS）表面上获得了超薄的纳米涂层膜。在低至100 Pa的低压状态下为^-1），机械稳定性（超过10,000个循环而没有任何故障或破裂）和快速的响应时间（90毫秒）。最终，所提出的压力传感器被成功地演示为实际应用中的人类脉搏率传感器和空间压力传感器阵列。对于这些应用，使用超滤的溶剂交换过程可以用作改善导电聚合物以及各种其他材料的涂层性能（润湿性）的通用技术。