Micropatterned elastic ionic polyacrylamide hydrogel for low-voltage capacitive and organic thin-film transistor pressure sensors

By M. Yin, Z. Yin, Yangxi Zhang, Q. Zheng, A. P. Zhang. Nano Energy, 2019

136 citations recorded by the source corpus.

Abstract Electronic skins (E-skins) have attracted great research interest because of their promising applications in stretchable optoelectronics, soft robotics, and personalized healthcare devices. However, it remains a great challenge to fabricate E-skin devices that meet strict practical requirements such as high sensitivity, low-power operation and noise-proof ability. Here, we developed a novel elastic ionic polyacrylamide hydrogel (EIPH) with a high capacitance for the development of low-voltage organic thin-film transistor (OTFT) pressure sensors. The EIPH was prepared by photopolymerization of an acrylamide monomer in an aqueous solution of poly (acrylic acid) and CaCl2 and was then in situ micropatterned on an indium-tin oxide electrode. The fabricated capacitive sensor with 10-µm-wide EIPH micropillar structures achieved a high sensitivity of 2.33 kPa−1 with a capacitance sensitivity of 103.8 nF/kPa. This capacitance sensitivity is more than 100 times higher than that of conventional capacitive pressure sensors due to the formation of an electrical double layer. The micropatterned EIPH was adopted as a dielectric layer in the fabrication of the OTFT-based pressure sensors. Such an EIPH-based OTFT pressure sensor not only greatly enhanced the sensitivity, i.e., 7.7 times higher than its capacitive counterparts, but also largely reduced the operation voltage to 2 V.

Subfields: Biomedical Engineering, Cognitive Neuroscience, Polymers and Plastics

View Paper: https://www.semanticscholar.org/paper/6ff1c2015e8b4df404b37e5cb32e6ed58777b111

How researchers see this paper

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In Biomedical Engineering

1. Chengkuo Lee
2. Tianyiyi He
3. Zixuan Zhang
4. Zhongda Sun
5. Qiongfeng Shi
6. Bowei Dong
7. Jianxiong Zhu
8. Xinge Guo

In Cognitive Neuroscience

1. Chengkuo Lee
2. Tianyiyi He
3. Zixuan Zhang
4. Qiongfeng Shi
5. Jianxiong Zhu
6. Bowei Dong
7. Zhongda Sun
8. Xinge Guo

In Polymers and Plastics

1. Chengkuo Lee
2. Tianyiyi He
3. Zixuan Zhang
4. Qiongfeng Shi
5. Zhongda Sun
6. Jianxiong Zhu
7. Bowei Dong
8. Xinge Guo

Citations in the corpus

• Progress in wearable electronics/photonics—Moving toward the era of artificial intelligence and internet of things (2020, background): “88 As the applied pressure varies, the resulting deformation of the microstructures induces a change in the capacitance of the device, through which the applied pressure can be accurately monitored.”