基于高度互联金纳米粒子网络的柔性透明呼吸传感器和导电电极

IF 3.5 Q2 CHEMISTRY, ANALYTICAL
Namuni Sneha and S. Kiruthika
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引用次数: 0

摘要

在这项研究中,通过一种简单的溶液方法,利用高度互连的金纳米粒子网络(金纳米网络)制造出了透明湿度传感器和导电电极(TCE)。在这种方法中,在较低温度(5 °C)下直接还原金属阴离子,然后加入非极性溶剂,可促进纳米粒子在连接处的冷焊接,并在液-液界面上形成相互连接的金纳米网络。形成的金纳米网络可谨慎地转移到所需的柔性、可拉伸和透明基底上,用于各种应用。由于合成过程不涉及封端剂,制备出的纳米网络无需进一步的化学或热处理即可提供高导电性。制备的金纳米网络具有高度的结晶性和热稳定性,对各种变形具有出色的机械稳健性。利用 Au-1L(1 层)纳米网络,制备出了一种高透明度(85%)湿度传感器,其响应时间和恢复时间都很短(1.1 秒和 1.3 秒)。对 Au-1L 传感器在各种湿度变化(40% 至 90%)和呼吸条件(正常/深呼吸、水合/脱水、呼吸/吹气等)下的性能进行了系统研究,结果表明该传感器对湿度具有高选择性。值得注意的是,该传感设备在一年多的时间里都能提供稳定的响应,这表明它具有长期使用的稳定性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Flexible & transparent breath sensor and conducting electrodes based on a highly interconnected Au nanoparticle network†

Flexible & transparent breath sensor and conducting electrodes based on a highly interconnected Au nanoparticle network†

Flexible & transparent breath sensor and conducting electrodes based on a highly interconnected Au nanoparticle network†

In this study, transparent humidity sensors and conducting electrodes (TCEs) were fabricated using a highly interconnected gold nanoparticle network (Au nanonetwork) via a simple solution approach. Here, the direct reduction of metal anions at lower temperatures (5 °C) followed by the addition of a non-polar solvent facilitates the cold welding of nanoparticles at junctions and yields an interconnected Au nanonetwork at the liquid–liquid interface. The formed Au nanonetwork is cautiously transferred to the desired flexible, stretchable, and transparent substrates for various applications. As the synthesis involves no capping agents, the prepared nanonetworks offer high conductivity without further chemical or thermal treatments. The fabricated Au nanonetwork is highly crystalline and thermally stable, with excellent mechanical robustness towards various deformations. Using an Au-1L (1-layer) nanonetwork, a highly transparent (>85%) humidity sensor is fabricated with short response and recovery times (1.1 s and 1.3 s). The Au-1L sensor is studied systematically for various humidity changes (40% to 90%) and breath conditions (normal/deep, hydrated/dehydrated, breathing/blowing, etc.) and exhibits high selectivity toward humidity. Notably, the sensing device offered a stable response for more than a year demonstrating its robustness for prolonged use.

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