Laser direct writing of reduced graphene oxide micropatterns and sensor applications

Akira Watanabe, Jinguang Cai

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

Micropatterns consisting of reduced graphene oxide (rGO) and graphene oxide (GO) were fabricated via laser direct writing where an insulating GO was converted to a conductive rGO by laser-induced reduction. The rGO/GO microinterdigitated electrode showed humidity sensing behaviors. The influence of the shape and size of the rGO/GO microinterdigitated electrode was studied to discuss the sensing mechanism and to improve the sensitivity. Three kinds of rGO(w)/GO(g) micropatterns were prepared by laser direct writing on a GO-coated PET (polyethylene terephthalate) substrate using a CW 405 nm semiconductor laser, where w and g are the rGO electrode width and the GO gap width between rGO electrodes in micrometer unit, respectively. The humidity sensing properties of rGO(400)/GO(100), rGO(160)/GO(40), and rGO(80)/GO(20) were studied by monitoring the output voltage waveform from an electronic circuit consisting an rGO/GO interdigitated electrode and resistors in AC mode operation. The sensitivity enhancement induced by charging property of an rGO/GO interdigitated electrodes was observed accompanying transient decay of the output voltage. The shape and size of an rGO/GO interdigitated electrode remarkably influenced the humidity sensing behaviors depending on the contribution ratio of C and R parameters.

Original languageEnglish
Title of host publicationLaser-Based Micro- and Nanoprocessing XII
EditorsKunihiko Washio, Rainer Kling, Udo Klotzbach
PublisherSPIE
ISBN (Electronic)9781510615250
DOIs
Publication statusPublished - 2018
EventLaser-Based Micro- and Nanoprocessing XII 2018 - San Francisco, United States
Duration: 2018 Jan 302018 Feb 1

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume10520
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Other

OtherLaser-Based Micro- and Nanoprocessing XII 2018
CountryUnited States
CitySan Francisco
Period18/1/3018/2/1

Keywords

  • graphene oxide
  • humidity sensor flexible electronics
  • in-plane micro-supercapacitor
  • laser direct writing
  • micro-interdigitated electrode
  • reduced graphene oxide

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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