Laser direct writing of reduced graphene oxide micropatterns and sensor applications

Akira Watanabe; Jinguang Cai

doi:10.1117/12.2288355

19 February 2018 Laser direct writing of reduced graphene oxide micropatterns and sensor applications

Akira Watanabe, Jinguang Cai

Proceedings Volume 10520, Laser-based Micro- and Nanoprocessing XII; 105200P (2018) https://doi.org/10.1117/12.2288355
Event: SPIE LASE, 2018, San Francisco, California, United States

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.

Citation Download Citation

Akira Watanabe and Jinguang Cai "Laser direct writing of reduced graphene oxide micropatterns and sensor applications", Proc. SPIE 10520, Laser-based Micro- and Nanoprocessing XII, 105200P (19 February 2018); https://doi.org/10.1117/12.2288355

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