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Breathable Nanomesh Humidity Sensor for Real-Time Skin Humidity Monitoring

  • Wooseong Jeong
    Wooseong Jeong
    Department of Emerging Materials Science, Daegu Gyeongbuk Institute of Science & Technology (DGIST), 333, Techno Jungang-daero, Hyeonpung-myeon, Dalseong-gun, Daegu 711-873, Republic of Korea
  • Jinkyu Song
    Jinkyu Song
    Department of Emerging Materials Science, Daegu Gyeongbuk Institute of Science & Technology (DGIST), 333, Techno Jungang-daero, Hyeonpung-myeon, Dalseong-gun, Daegu 711-873, Republic of Korea
    More by Jinkyu Song
  • Jihoon Bae
    Jihoon Bae
    Department of Emerging Materials Science, Daegu Gyeongbuk Institute of Science & Technology (DGIST), 333, Techno Jungang-daero, Hyeonpung-myeon, Dalseong-gun, Daegu 711-873, Republic of Korea
    More by Jihoon Bae
  • Koteeswara Reddy Nandanapalli
    Koteeswara Reddy Nandanapalli
    Department of Emerging Materials Science, Daegu Gyeongbuk Institute of Science & Technology (DGIST), 333, Techno Jungang-daero, Hyeonpung-myeon, Dalseong-gun, Daegu 711-873, Republic of Korea
  • , and 
  • Sungwon Lee*
    Sungwon Lee
    Department of Emerging Materials Science, Daegu Gyeongbuk Institute of Science & Technology (DGIST), 333, Techno Jungang-daero, Hyeonpung-myeon, Dalseong-gun, Daegu 711-873, Republic of Korea
    *E-mail: [email protected]
    More by Sungwon Lee
Cite this: ACS Appl. Mater. Interfaces 2019, 11, 47, 44758–44763
Publication Date (Web):November 6, 2019
https://doi.org/10.1021/acsami.9b17584
Copyright © 2019 American Chemical Society

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    Abstract

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    The importance of monitoring the condition of skin is increasing as its relevance to health is becoming more well understood. Inappropriate humidity levels can cause atopic dermatitis or hair loss. However, conventional film substrates used in electronic skin monitoring devices cause accumulation of sweat or gas between the device and biological tissue, leading to negative effects in long-term humidity measurements. Thus, real-time measurements of skin humidity over long periods are difficult using conventional film devices. Here, a breathable nanomesh humidity sensor that can monitor skin humidity for a long time is developed by using biocompatible materials such as gold, poly(vinyl alcohol), and Parylene C. The sensor presents excellent gas and sweat permeability and precisely detects the humidity level of an object for a long time. This study demonstrates the successful real-time detection of the humidity level from human skin and also detects the relative humidity of a plant surface over a prolonged period. This sensor is expected to have wide applicability for cultivating delicate plants as well as to reveal correlations between skin humidity and disease for biomedical applications.

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    The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acsami.9b17584.

    • Field-emission scanning electron micrographs of the PVA nanofibers; optical image of the sensor layer that was deposited by gold onto the PVA nanofiber; fabrication method of PVA nanomesh humidity sensor; SEM images of single Parylene C-coated PVA nanofibers; normalized resistance changes in response to relative humidity (RH) depending on the substrate; pore radius of capillary condensation (Kelvin equation); comparison of response and relaxation times of nanomesh humidity sensor and commercially available humidity sensor; resistance changes of the PVA nanomesh humidity sensor under six cycles ranging from 30 RH% to 98 RH%; sensor images at different bending radii; SEM images of gold surface on nanofibers and PVA film; gas permeability of the sensor; sensor image attached to the surface of Epipremnum aureum leaf (PDF)

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