Department of Electronic Engineering, Chang Gung University, Guishan Dist., 33302, Taoyuan, Taiwan.
Department of Neurosurgery, Chang Gung Memorial Hospital, Guishan Dist., 33305, Taoyuan, Taiwan.
Sci Rep. 2017 Sep 25;7(1):12252. doi: 10.1038/s41598-017-12420-5.
In this study, the cross-talk effects and the basic piezoresistive characteristics of gold nanoparticle (Au-NP) incorporated poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) pressure sensing 2 × 2 arrays are investigated using a cross-point electrode (CPE) structure. Transmission electron microscopy (TEM), scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDS) mappings were carried out to confirm the incorporation of Au-NPs in the PEDOT:PSS films. A solution mixing process was employed to incorporate the nanoparticles. When the diameter of the Au-NPs incorporated in the PEDOT:PSS films (Au-NPs/PEDOT:PSS) was 20 nm, the piezoresistive pressure sensing 2 × 2 arrays were almost immune to cross-talk effects, which enhances the pressure sensing accuracy of the array. The Au-NPs render the PEDOT:PSS films more resilient. This is confirmed by the high plastic resistance values using a nanoindenter, which reduce the interference between the active and passive cells. When the size of the Au-NPs is more than 20 nm, a significant cross-talk effect is observed in the pressure sensing arrays as a result of the high conductivity of the Au-NPs/PEDOT:PSS films with large Au-NPs. With the incorporation of optimally sized Au-NPs, the PEDOT:PSS piezoresistive pressure sensing arrays can be promising candidates for future high-resolution fingerprint identification system with multiple-electrode array structures.
本研究采用交叉指电极（CPE）结构，研究了金纳米粒子（Au-NP）掺入聚（3,4-亚乙基二氧噻吩）：聚（苯乙烯磺酸盐）（PEDOT：PSS）压敏 2×2 阵列的互扰效应和基本压阻特性。通过透射电子显微镜（TEM）、扫描电子显微镜（SEM）和能谱（EDS）映射证实了 Au-NPs 掺入 PEDOT：PSS 薄膜中。采用溶液混合工艺将纳米粒子掺入。当掺入 PEDOT：PSS 薄膜中的 Au-NPs（Au-NPs/PEDOT：PSS）的直径为 20nm 时，压阻式 2×2 阵列几乎不受互扰效应的影响，从而提高了阵列的压力传感精度。Au-NPs 使 PEDOT：PSS 薄膜更具弹性。这一点通过纳米压痕仪的高塑性阻力值得到证实，纳米压痕仪降低了有源和无源单元之间的干扰。当 Au-NPs 的尺寸大于 20nm 时，由于具有大 Au-NPs 的 Au-NPs/PEDOT：PSS 薄膜的高导电性，压敏阵列中观察到明显的互扰效应。通过掺入最佳尺寸的 Au-NPs，PEDOT：PSS 压阻式压力传感阵列有望成为未来具有多电极阵列结构的高分辨率指纹识别系统的候选材料。
