Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 3, Pages 3438-3449Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b17765
Keywords
randomly distributed microstructures; iontronic film; electrical double layer; AgNWs/PDMS; solid electrolyte
Funding
- Technology Innovation Program - Ministry of Trade, Industry & Energy (MI, Korea) [20000773, 10053023]
- Bio & Medical Technology Development Program of the NRF grant - Korean government (MSIT) [NRF2017M3A9F1031270]
- Korea Evaluation Institute of Industrial Technology (KEIT) [10053023] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The rapid development of pressure sensors Conductive tape with distinct functionalities, notably, with increased sensitivity, fast response time, conformability, and a high degree of deformability, has increased the demand for wearable electronics. In particular, pressure sensors with an excellent sensitivity in the low-pressure range (<2 kPa) and a large working range simultaneously are strongly demanded for practical applications in wearable electronics. Here, we demonstrate an emerging class of solid polymer electrolyte obtained by incorporating a room-temperature ionic liquid, 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide with poly(vinylidene fluoride-co-hexafluoropropylene) as a high-capacitance dielectric layer for interfacial capacitive pressure sensing applications. The solid polymer electrolyte exhibits a very high interfacial capacitance by virtue of mobile ions that serve as an electrical double layer in response to an electric field. The randomly distributed microstructures created on the solid electrolyte help the material to elastically deform under pressure. Moreover, the interfacial capacitance is improved by utilizing a highly conductive porous percolated network of silver nanowires reinforced with poly(dimethylsiloxane) as the electrodes. An ultrahigh-pressure sensitivity of 131.5 kPa(-1), a low dynamic response time of similar to 43 ms, a low limit of detection of 1.12 Pa, and a high stability for over 7000 cycles are achieved. Finally, we demonstrate the application of the sensor for international Morse code detection, artery pulse detection, and eye blinking. Owing to the ultrahigh sensitivity, the as-fabricated sensor will have great potential for wearable devices in health status monitoring, motion detection, and electronic skin.
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