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Facile synthesis of laser-induced graphene oxide and its humidity sensing properties

  • Carbon Letters
  • Abbr : Carbon Lett.
  • 2024, 34(4), pp.1173-1185
  • DOI : 10.1007/s42823-023-00672-3
  • Publisher : Korean Carbon Society
  • Research Area : Natural Science > Natural Science General > Other Natural Sciences General
  • Received : October 3, 2023
  • Accepted : December 13, 2023
  • Published : June 14, 2024

An Jin Woo 1 Hyeong Seok-Ki 2 Kim Kang Min 2 Lee Hee Ra 1 Park Ji-won 3 Kim Tae-Wook 4 Bae Sukang 5 Lee Seoung-Ki ORD ID 1

1부산대학교
2한국과학기술연구원 기능성복합재료연구센터
3(주)JB랩 기업부설연구소
4전북대학교
5Department of JBNU, KIST Industry-Academia Convergence Research, Jeonbuk National University

Accredited

ABSTRACT

In this study, laser-induced graphene oxide (LIGO) was synthesized through a facile liquid-based process involving the introduction of deionized (DI) water onto polyimide (PI) film and subsequent direct laser irradiation using a CO2 laser (λ = 10.6 μm). The synthesized LIGO was then evaluated as a sensing material for monitoring changes in humidity levels. The synthesis conditions were optimized by precisely controlling the laser scribing speed, leading to the synthesis of LIGO with different structural characteristics and varying oxygen contents. The increased number of oxygen-containing functional groups contributed to the hydrophilic properties of LIGO, resulting in a superior humidity sensing capabilities compared with laser-induced graphene (LIG). The LIGO-based sensors outperformed LIG-based sensors, demonstrating approximately tenfold higher sensing responsivity when detecting changes at each humidity level, along with 1.25 to 1.75 times faster response/recovery times, making LIGO-based sensors more promising for humidity-monitoring applications. This study demonstrated laser ablation in a renewable and natural precursor as an eco-friendly and energy-efficient approach to directly synthesize LIGO with controllable oxidation levels.

Citation status

* References for papers published after 2022 are currently being built.

This paper was written with support from the National Research Foundation of Korea.