Pressure-conductive rubber sensor based on liquid-metal-PDMS composite

Jun Ho Oh, Ju Yeon Woo, Sunghwan Jo, Chang-Soo Han

Research output: Contribution to journalArticle

Abstract

We present a pressure-conductive rubber sensor using a liquid-metal-polydimethylsiloxane (PDMS) composite suitable for incorporation onto surfaces with a complex curvature such as the human body. The composite is synthesized by physical mixing of Galinstan and PDMS based on magnetic stirring. This composite is conductive only when a mechanical pressure exceeding the threshold value or strain is applied; the pristine state of the composite is not conductive. The threshold value can be controlled by adjusting the mixing ratio of liquid metal and PDMS. This material is mechanically robust, allowing it to operate reliably under various elastic deformations such as pressing, stretching, and bending without structural failure and performance degradation. Moreover, a fabricated sensor array can detect the distribution of the applied pressure in plane. As a feasibility study, we demonstrate a pressure-conductive rubber sensor for detecting finger movements and bio-signals such as blood pressure and respiration rate. Our results reveal that our rubber sensor is practical as a wearable sensor because of its mechanical robustness and electrical reliability.

Original languageEnglish
Article number111610
JournalSensors and Actuators, A: Physical
Volume299
DOIs
Publication statusPublished - 2019 Nov 1

Fingerprint

Rubber
Polydimethylsiloxane
liquid metals
Liquid metals
rubber
composite materials
sensors
Sensors
Composite materials
Pressing (forming)
Bending (forming)
Bending (deformation)
structural failure
Blood pressure
Sensor arrays
Elastic deformation
blood pressure
thresholds
Stretching
elastic deformation

Keywords

  • Composite
  • Electrical conductivity
  • Liquid metal
  • Pressure conductive rubber
  • Sensor

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering

Cite this

Pressure-conductive rubber sensor based on liquid-metal-PDMS composite. / Oh, Jun Ho; Woo, Ju Yeon; Jo, Sunghwan; Han, Chang-Soo.

In: Sensors and Actuators, A: Physical, Vol. 299, 111610, 01.11.2019.

Research output: Contribution to journalArticle

@article{2d1fe4a4776e4c1d941b8e0071b8c9ce,
title = "Pressure-conductive rubber sensor based on liquid-metal-PDMS composite",
abstract = "We present a pressure-conductive rubber sensor using a liquid-metal-polydimethylsiloxane (PDMS) composite suitable for incorporation onto surfaces with a complex curvature such as the human body. The composite is synthesized by physical mixing of Galinstan and PDMS based on magnetic stirring. This composite is conductive only when a mechanical pressure exceeding the threshold value or strain is applied; the pristine state of the composite is not conductive. The threshold value can be controlled by adjusting the mixing ratio of liquid metal and PDMS. This material is mechanically robust, allowing it to operate reliably under various elastic deformations such as pressing, stretching, and bending without structural failure and performance degradation. Moreover, a fabricated sensor array can detect the distribution of the applied pressure in plane. As a feasibility study, we demonstrate a pressure-conductive rubber sensor for detecting finger movements and bio-signals such as blood pressure and respiration rate. Our results reveal that our rubber sensor is practical as a wearable sensor because of its mechanical robustness and electrical reliability.",
keywords = "Composite, Electrical conductivity, Liquid metal, Pressure conductive rubber, Sensor",
author = "Oh, {Jun Ho} and Woo, {Ju Yeon} and Sunghwan Jo and Chang-Soo Han",
year = "2019",
month = "11",
day = "1",
doi = "10.1016/j.sna.2019.111610",
language = "English",
volume = "299",
journal = "Sensors and Actuators, A: Physical",
issn = "0924-4247",
publisher = "Elsevier",

}

TY - JOUR

T1 - Pressure-conductive rubber sensor based on liquid-metal-PDMS composite

AU - Oh, Jun Ho

AU - Woo, Ju Yeon

AU - Jo, Sunghwan

AU - Han, Chang-Soo

PY - 2019/11/1

Y1 - 2019/11/1

N2 - We present a pressure-conductive rubber sensor using a liquid-metal-polydimethylsiloxane (PDMS) composite suitable for incorporation onto surfaces with a complex curvature such as the human body. The composite is synthesized by physical mixing of Galinstan and PDMS based on magnetic stirring. This composite is conductive only when a mechanical pressure exceeding the threshold value or strain is applied; the pristine state of the composite is not conductive. The threshold value can be controlled by adjusting the mixing ratio of liquid metal and PDMS. This material is mechanically robust, allowing it to operate reliably under various elastic deformations such as pressing, stretching, and bending without structural failure and performance degradation. Moreover, a fabricated sensor array can detect the distribution of the applied pressure in plane. As a feasibility study, we demonstrate a pressure-conductive rubber sensor for detecting finger movements and bio-signals such as blood pressure and respiration rate. Our results reveal that our rubber sensor is practical as a wearable sensor because of its mechanical robustness and electrical reliability.

AB - We present a pressure-conductive rubber sensor using a liquid-metal-polydimethylsiloxane (PDMS) composite suitable for incorporation onto surfaces with a complex curvature such as the human body. The composite is synthesized by physical mixing of Galinstan and PDMS based on magnetic stirring. This composite is conductive only when a mechanical pressure exceeding the threshold value or strain is applied; the pristine state of the composite is not conductive. The threshold value can be controlled by adjusting the mixing ratio of liquid metal and PDMS. This material is mechanically robust, allowing it to operate reliably under various elastic deformations such as pressing, stretching, and bending without structural failure and performance degradation. Moreover, a fabricated sensor array can detect the distribution of the applied pressure in plane. As a feasibility study, we demonstrate a pressure-conductive rubber sensor for detecting finger movements and bio-signals such as blood pressure and respiration rate. Our results reveal that our rubber sensor is practical as a wearable sensor because of its mechanical robustness and electrical reliability.

KW - Composite

KW - Electrical conductivity

KW - Liquid metal

KW - Pressure conductive rubber

KW - Sensor

UR - http://www.scopus.com/inward/record.url?scp=85072315783&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85072315783&partnerID=8YFLogxK

U2 - 10.1016/j.sna.2019.111610

DO - 10.1016/j.sna.2019.111610

M3 - Article

AN - SCOPUS:85072315783

VL - 299

JO - Sensors and Actuators, A: Physical

JF - Sensors and Actuators, A: Physical

SN - 0924-4247

M1 - 111610

ER -