Chen Jianzhou, Wu Ting, Zhang Libing, Li Peng, Feng Xiaowei, Li Dazhen
College of Mechanical and Electrical Engineering, Jiaxing University, Jiaxing 314001, China.
Micromachines (Basel). 2019 Apr 27;10(5):287. doi: 10.3390/mi10050287.
A micro pattern is a key component of various functional devices. In the present study, using the poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) mixed material as the direct-writing solution and photographic paper as the flexible insulating substrate, the organic micro patterns of various shapes, such as the curve of the second-order self-similar structure, the helical curve, and the wave curve, were fabricated on the flexible insulating substrate by using the near-field electrohydrodynamic direct-writing method. The effects of process parameters, such as the applied voltage, direct-writing height, flow rate of the injection system, and moving velocity of the substrate, on the width and the conductivity of the organic micro patterns were studied in the near-field electrohydrodynamic direct-writing process. The results show that the width of an organic micro pattern increases with the increase of the applied voltage of the high-voltage power supplier and the flow rate of the injection system under the condition where the three other process parameters remained constant, respectively, while the width of an organic micro pattern decreases with the increase of the direct-writing height and the moving velocity of the flexible substrate, respectively. The fabricated organic microcircuit patterns of the natural drying in air at room temperature were tested by a thin film thermoelectric tester at a detection temperature. The results show that the conductivity of a fabricated organic micro pattern decreases with the increase of the electric field intensity, while the effect of moving velocity and the flow rate on the conductivity is small under the condition where the three other process parameters remained constant.
微图案是各种功能器件的关键组成部分。在本研究中，以聚（3,4-乙撑二氧噻吩）：聚（苯乙烯磺酸盐）（PEDOT:PSS）混合材料作为直写溶液，以相纸作为柔性绝缘基板，采用近场电流体动力学直写方法在柔性绝缘基板上制备了各种形状的有机微图案，如二阶自相似结构曲线、螺旋曲线和波浪曲线。研究了近场电流体动力学直写过程中工艺参数，如施加电压、直写高度、注射系统流速和基板移动速度对有机微图案宽度和电导率的影响。结果表明，在其他三个工艺参数分别保持不变的条件下，有机微图案的宽度分别随着高压电源施加电压和注射系统流速的增加而增大，而有机微图案的宽度分别随着直写高度和柔性基板移动速度的增加而减小。通过薄膜热电测试仪在检测温度下对在室温空气中自然干燥的制备有机微电路图案进行测试。结果表明，制备的有机微图案的电导率随着电场强度的增加而降低，而在其他三个工艺参数保持不变的条件下，移动速度和流速对电导率的影响较小。
