Journal
ACS NANO
Volume 15, Issue 3, Pages 4380-4393Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.0c07847
Keywords
MXene; lithium sulfonamides; ionic nanofibrous membrane; capacitive pressure sensor; e-skin; wearable medical device
Categories
Funding
- Ministry of Trade, Industry & Energy (MI, Korea) [20000773]
- Bio & Medical Technology Development Program of the NRF - Korean government (MSIT) [NRF-2017M3A9F1031270]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20000773] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [4299990114056] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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A novel method involving a hybrid ionic nanofibrous membrane sensing layer was proposed to enhance the sensitivity and linearity range of a capacitive pressure sensor. The sensor exhibited high sensitivity, short response time, and excellent durability, making it potentially useful for mobile medical monitoring devices and next-generation artificial e-skin.
Recently, flexible capacitive pressure sensors have received significant attention in the field of wearable electronics. The high sensitivity over a wide linear range combined with long-term durability is a critical requirement for the fabrication of reliable pressure sensors for versatile applications. Herein, we propose a special approach to enhance the sensitivity and linearity range of a capacitive pressure sensor by fabricating a hybrid ionic nanofibrous membrane as a sensing layer composed of Ti3C2Tx MXene and an ionic salt of lithium sulfonamides in a poly(vinyl alcohol) elastomer matrix. The reversible ion pumping triggered by a hydrogen bond in the hybrid sensing layer leads to high sensitivities of 5.5 and 1.5 kPa(-1) in the wide linear ranges of 0-30 and 30-250 kPa, respectively, and a fast response time of 70.4 ms. In addition, the fabricated sensor exhibits a minimum detection limit of 2 Pa and high durability over 20 000 continuous cycles even under a high pressure of 45 kPa. These results indicate that the proposed sensor can be potentially used in mobile medical monitoring devices and next-generation artificial e-skin.
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