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Inkjet Printing of Highly Sensitive, Transparent, Flexible Linear Piezoresistive Strain Sensors

机译:喷墨印花高敏感,透明,柔性线性压阻式应变传感器

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摘要

Flexible strain sensors are fabricated by using a simple and low-cost inkjet printing technology of graphene-PEDOT:PSS (poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate)) conductive ink. The inkjet-printed thin-film resistors on a polyethylene terephthalate (PET) substrate exhibit an excellent optical transmittance of about 90% over a visible wavelength range from 400 to 800 nm. While an external mechanical strain is applied to thin-film resistors as strain sensors, a gauge factor (GF) of the piezoresistive (PR) strain sensors can be evaluated. To improve the GF value of the PR strain sensors, a high resistive (HR) path caused by the phase segregation of the PEDOT:PSS polymer material is, for the first time, proposed to be perpendicular to the PR strain sensing direction. The increase in the GF with the increase in the HR number of the PR strain sensors without a marked hysteresis is found. The result can be explained by the tunneling effect with varied initial tunneling distances and tunneling barriers due to the increase in the number of HR. Finally, a high GF value of approximately 165 of three HR paths is obtained with a linear output signal at the strain range from 0% to 0.33%, further achieving for the inkjet printing of highly sensitive, transparent, and flexible linear PR strain sensors.
机译:通过使用石墨烯 - PEDOT的简单和低成本的喷墨印刷技术制造柔性应变传感器:PSS(聚(苯乙烯酸酯))导电油墨。在聚对苯二甲酸乙二醇酯(PET)底物上的喷墨印刷的薄膜电阻在400至800nm的可见波长范围内具有约90%的优异光学透射率。虽然外部机械应变被施加到薄膜电阻器作为应变传感器,但可以评估压阻(PR)应变传感器的量因子(GF)。为了改善Pr菌株传感器的GF值,由PEDOT的相位分离引起的高电阻(HR)路径:PSS聚合物材料是第一次提出垂直于PR应变感测方向。发现GF的增加随着没有标记滞后的PR菌株传感器的HR数量的增加。由于HR数量的增加,可以通过具有变化的初始隧道距离和隧道障碍的隧道效应来解释结果。最后,在应变的线性输出信号范围为0%至0.33%的线性输出信号,进一步实现高度敏感,透明和柔性线性PR应变传感器的线性输出信号,获得大约165个HR路径的高GF值。

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