Electrical, surface, chemical, tensile, and respiratory signal properties of non-oxidized graphene/polyurethane nanoweb according to heat, ethanol, and polydimethylsiloxane treatments

Hyo Cheol Lee, Eugene Lee, Gilsoo Cho

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

In this study, polyurethane (PU) nanoweb was treated with non-oxidized graphene (nOG)/polydimethylsiloxane (PDMS) using heat, ethanol, and PDMS treatments to fabricate a textile-based strain sensor for respiration measurement. To fabricate wearable strain sensors, PU nanoweb was treated with 1 wt% nOG dispersion and dried at room temperature (21 °C) for 24 hours, and the specimen was named specimen G. PU nanoweb treated with nOG and dried at 50 °C for 1 hour in a vacuum oven chamber was named specimen GH. PU nanoweb immersed in ethanol for 15 minutes, then treated with nOG, and dried at room temperature for 24 hours, was named specimen GE. The specimen treated with both heat and ethanol treatments shrunk and was damaged and even melted. To evaluate the electrical property of the specimens, electrical linear resistance was measured using a multimeter device. To characterize the surface, chemical, and tensile properties, a field emission scanning electron microscopy, fourier transform infrared spectroscopy, and an universal tensile machine were utilized. To acquire and analyze the respiratory signals, MP150 (Biopac system Inc., USA) and Acqknowledge (ver. 4.2, Biopac system Inc., USA) were used. All signals were obtained in real time. The results showed that specimen GE had the lowest resistance (8.6 Ω cm-2) when unstrained. Specimen GHP had the least difference (104.6 Ω cm-1 to 451.2 Ω cm-1) when strained at 5% and 10%. The surface of the treated specimens were coated with the nOG and PDMS. Specimens GP, GHP, and GEP were more durable and stretchable due to the PDMS treatment. Also, the specimens showed repetitive and stable signals corresponding to inhalation and exhalation. This study, therefore, is a meaningful research in the development of ultra-thin and ultra-lightweight textile-based strain sensors for respiration measurement using nOG/PDMS/PU nanoweb.

Original languageEnglish
Article number075028
JournalSmart Materials and Structures
Volume29
Issue number7
DOIs
Publication statusPublished - 2020 Jul

Bibliographical note

Publisher Copyright:
© 2020 IOP Publishing Ltd.

All Science Journal Classification (ASJC) codes

  • Signal Processing
  • Civil and Structural Engineering
  • Atomic and Molecular Physics, and Optics
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Electrical and Electronic Engineering

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