Highly Stretchable and Wearable Thermotherapy Pad with Micropatterned Thermochromic Display Based on Ag Nanowire–Single-Walled Carbon Nanotube Composite

Hyunmin Kim, Minjeong Seo, Jong Woo Kim, Do Kyun Kwon, Song Ee Choi, Jin Woong Kim, Jae Min Myoung

Research output: Contribution to journalArticle

Abstract

Due to the increasing interest in wearable devices, flexible and stretchable film heaters have been widely studied, as alternatives to heaters with conventional rigid shapes. Herein, a highly stretchable film heater (SFH) based on the silver nanowire (Ag NW)–single-walled carbon nanotube composite with a thermochromic display on a polydimethylsiloxane (PDMS) substrate is successfully fabricated. The SFH shows excellent electrical conductivity, high mechanical stretchability, and outstanding reliability, with no significant degradation after 10 000 stretching cycles under tensile strain. The SFH can be heated to the target temperature (≈60 °C) within 30 s at a low applied voltage. In addition, a thermochromic display is fabricated to help prevent the risk of low-temperature burns. Red (R), green (G), and blue (B) thermochromic microparticles (TMPs) are synthesized using drop-based microfluidic technology. The TMPs show RGB colors at room temperature but change to a white color above a certain temperature. The TMPs are arrayed into a PDMS stencil on the basis of their particle sizes using the rubbing technique. The micropatterned thermochromic display, which functions as a visual alarm, combined with the SFH can pave the way for the development of thermotherapy pads for next-generation wearable devices in the medical field.

Original languageEnglish
Article number1901061
JournalAdvanced Functional Materials
Volume29
Issue number24
DOIs
Publication statusPublished - 2019 Jun 13

Fingerprint

Carbon Nanotubes
heaters
Carbon nanotubes
carbon nanotubes
Display devices
composite materials
Composite materials
microparticles
Polydimethylsiloxane
Color
Temperature
Tensile strain
color
Single-walled carbon nanotubes (SWCN)
Silver
Microfluidics
warning systems
Stretching
Nanowires
low voltage

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Electrochemistry

Cite this

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title = "Highly Stretchable and Wearable Thermotherapy Pad with Micropatterned Thermochromic Display Based on Ag Nanowire–Single-Walled Carbon Nanotube Composite",
abstract = "Due to the increasing interest in wearable devices, flexible and stretchable film heaters have been widely studied, as alternatives to heaters with conventional rigid shapes. Herein, a highly stretchable film heater (SFH) based on the silver nanowire (Ag NW)–single-walled carbon nanotube composite with a thermochromic display on a polydimethylsiloxane (PDMS) substrate is successfully fabricated. The SFH shows excellent electrical conductivity, high mechanical stretchability, and outstanding reliability, with no significant degradation after 10 000 stretching cycles under tensile strain. The SFH can be heated to the target temperature (≈60 °C) within 30 s at a low applied voltage. In addition, a thermochromic display is fabricated to help prevent the risk of low-temperature burns. Red (R), green (G), and blue (B) thermochromic microparticles (TMPs) are synthesized using drop-based microfluidic technology. The TMPs show RGB colors at room temperature but change to a white color above a certain temperature. The TMPs are arrayed into a PDMS stencil on the basis of their particle sizes using the rubbing technique. The micropatterned thermochromic display, which functions as a visual alarm, combined with the SFH can pave the way for the development of thermotherapy pads for next-generation wearable devices in the medical field.",
author = "Hyunmin Kim and Minjeong Seo and Kim, {Jong Woo} and Kwon, {Do Kyun} and Choi, {Song Ee} and Kim, {Jin Woong} and Myoung, {Jae Min}",
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Highly Stretchable and Wearable Thermotherapy Pad with Micropatterned Thermochromic Display Based on Ag Nanowire–Single-Walled Carbon Nanotube Composite. / Kim, Hyunmin; Seo, Minjeong; Kim, Jong Woo; Kwon, Do Kyun; Choi, Song Ee; Kim, Jin Woong; Myoung, Jae Min.

In: Advanced Functional Materials, Vol. 29, No. 24, 1901061, 13.06.2019.

Research output: Contribution to journalArticle

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T1 - Highly Stretchable and Wearable Thermotherapy Pad with Micropatterned Thermochromic Display Based on Ag Nanowire–Single-Walled Carbon Nanotube Composite

AU - Kim, Hyunmin

AU - Seo, Minjeong

AU - Kim, Jong Woo

AU - Kwon, Do Kyun

AU - Choi, Song Ee

AU - Kim, Jin Woong

AU - Myoung, Jae Min

PY - 2019/6/13

Y1 - 2019/6/13

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