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Cited by 354

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Highly Sensitive Capacitive Pressure Sensors over a Wide Pressure Range Enabled by the Hybrid Responses of a Highly Porous Nanocomposite

Open access
Ha, Kyoung‐Ho, Zhang, Weiyi, Jang, Hongwoo, Kang, Seungmin, Wang, Liu, Tan, Philip, Hwang, Hochul, Lu, Nanshu·2021·Advanced Materials

Abstract

Past research aimed at increasing the sensitivity of capacitive pressure sensors has mostly focused on developing dielectric layers with surface/porous structures or higher dielectric constants. However, such strategies have only been effective in improving sensitivities at low pressure ranges (e.g., up to 3 kPa). To overcome this well‐known obstacle, herein, a flexible hybrid‐response pressure sensor (HRPS) composed of an electrically conductive porous nanocomposite (PNC) laminated with an ultrathin dielectric layer is devised. Using a nickel foam template, the PNC is fabricated with carbon nanotubes (CNTs)‐doped Ecoflex to be 86% porous and electrically conductive. The PNC exhibits hybrid piezoresistive and piezocapacitive responses, resulting in significantly enhanced sensitivities (i.e., more than 400%) over wide pressure ranges, from 3.13 kPa−1 within 0–1 kPa to 0.43 kPa−1 within 30–50 kPa. The effect of the hybrid responses is differentiated from the effect of porosity or high dielectric constants by comparing the HRPS with its purely piezocapacitive counterparts. Fundamental understanding of the HRPS and the prediction of optimal CNT doping are achieved through simplified analytical models. The HRPS is able to measure pressures from as subtle as the temporal arterial pulse to as large as footsteps.

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Metadata

Authors
Ha, K., Zhang, W., Jang, H., Kang, S., Wang, L., Tan, P., Hwang, H., & Lu, N.
Venue
Advanced Materials
Publisher
Wiley
Published
2021-09-27
Volume
33
Issue
48
Pages
e2103320-e2103320
ISSN
  • 0935-9648 (ISSN-L)
  • 1521-4095
OpenAlex
W3202348803
Cited by
354
References
9
FWCI
16.94
Type
journal article
Language
en
Open access
bronze

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CoChat. (2026). Citation check: Highly Sensitive Capacitive Pressure Sensors over a Wide Pressure Range Enabled by the Hybrid Responses of a Highly Porous Nanocomposite. https://app.cochat.ai/papers/10.1002/adma.202103320
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Ha, K., Zhang, W., Jang, H., Kang, S., Wang, L., Tan, P., Hwang, H., & Lu, N. (2021). Highly Sensitive Capacitive Pressure Sensors over a Wide Pressure Range Enabled by the Hybrid Responses of a Highly Porous Nanocomposite. Advanced Materials. https://doi.org/10.1002/adma.202103320

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