A Wearable Patch Based on Flexible Porous Reduced Graphene Oxide Paper Sensor for Real-Time and Continuous Ultraviolet Radiation Monitoring

Hyun Joo Lee, Won G. Hong, Hee Yeon Yang, Dong Han Ha, Yongseok Jun, Yong Ju Yun

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


Real-time and continuous monitoring of ultraviolet (UV) radiation in daily activity is critical in diverse fields ranging from personal fitness, cosmetics, to medical aspects. Here, a wearable UV monitoring patch that can be easily fixed/removed at desired locations and provide real-time and continuous UVA levels in daily life is developed. The wearable patch consists of a highly sensitive, flexible graphene sensor for UVA measurement and a multifunctional fabric patch integrated with commercial electronic components for signal processing, wireless transmission. To achieve a high sensitive UVA sensor with high flexibility and long-term stability, porous reduced graphene oxide (pRGO) papers are fabricated by simple solvent evaporation followed by thermochemical reduction. The flexible UVA sensors based on pRGO papers feature a high UVA photoresponsivity of 125 mA W−1, which is comparable to that of a commercial silicon-based UV sensor. Furthermore, the polydimethylsiloxane-encapsulated pRGO (PDMS-pRGO) sensors exhibit stable UVA photoresponse characteristics that is maintained under severe conditions, such as a large number of bending cycles, thermal heating, and high humidity. The use of wearable patches that enable real-time, wireless monitoring of personal UVA levels in various practical applications are demonstrated.

Original languageEnglish
Article number2100709
JournalAdvanced Materials Technologies
Issue number3
Publication statusPublished - 2022 Mar

Bibliographical note

Funding Information:
H.J.L., W.G.H., and H.Y.Y. contributed equally to this work. This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (Nos. 2018R1D1A1B07045581 and 2020R1I1A1A01067642) and by a Korea University Grant.

Publisher Copyright:
© 2021 Wiley-VCH GmbH.


  • PDMS encapsulation
  • flexible ultraviolet sensor
  • graphene paper
  • porous graphene
  • reduced graphene oxide
  • wearable ultraviolet patch

ASJC Scopus subject areas

  • General Materials Science
  • Mechanics of Materials
  • Industrial and Manufacturing Engineering


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