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Highly Transparent and Flexible Iontronic Pressure Sensors Based on an Opaque to Transparent Transition

机译：基于不透明到透明过渡的高度透明和灵活的电子压力传感器

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摘要

Human–computer interfaces, smart glasses, touch screens, and some electronic skins require highly transparent and flexible pressure‐sensing elements. Flexible pressure sensors often apply a microstructured or porous active material to improve their sensitivity and response speed. However, the microstructures or small pores will result in high haze and low transparency of the device, and thus it is challenging to balance the sensitivity and transparency simultaneously in flexible pressure sensors or electronic skins. Here, for a capacitive‐type sensor that consists of a porous polyvinylidene fluoride (PVDF) film sandwiched between two transparent electrodes, the challenge is addressed by filling the pores with ionic liquid that has the same refractive index with PVDF, and the transmittance of the film dramatically boosts from 0 to 94.8% in the visible range. Apart from optical matching, the ionic liquid also significantly improves the signal intensity as well as the sensitivity due to the formation of an electric double layer at the dielectric‐electrode interfaces, and improves the toughness and stretchability of the active material benefiting from a plasticization effect. Such transparent and flexible sensors will be useful in smart windows, invisible bands, and so forth.
机译：人机界面，智能眼镜，触摸屏和某些电子皮肤需要高度透明和灵活的压力感应元件。柔性压力传感器通常使用微结构或多孔活性材料来提高其灵敏度和响应速度。然而，微结构或小孔将导致装置的高雾度和低透明性，因此在柔性压力传感器或电子皮肤中同时平衡灵敏度和透明性具有挑战性。在此，对于由多孔聚偏二氟乙烯（PVDF）膜夹在两个透明电极之间的电容式传感器，通过用与PVDF折射率相同的离子液体填充孔来解决挑战，在可见光范围内，胶卷从0大幅提升至94.8％。除了光学匹配以外，由于在介电电极界面上形成了双电层，离子液体还显着提高了信号强度和灵敏度，并受益于塑化效果，提高了活性材料的韧性和可拉伸性。这种透明而灵活的传感器将在智能窗户，不可见的条带等中有用。

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