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Proceedings Paper

Formation of graphene hybrid structures by laser direct writing and sensor applications
Author(s): Akira Watanabe; Ashiqur Rahman; Jinguang Cai; Mohammod Aminuzzaman
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Paper Abstract

Laser direct writing based on a graphene hybrid material was studied to develop the on-demand fabrication of an antenna-type sensor device related to IoT technology. A few-layer graphene oxide (GO) water dispersion formed a gel-like fluid and worked as a binder for CuO nanorods (NRs). A Go/CuO NRs hybrid coated flexible polymer substrate was scanned by a 445 nm semiconductor laser through a Galvano-scanner. Optical microscope images showed the Cu grain growth with increasing the laser power although a laser scanning under excess laser power condition formed an inhomogeneous film with the formation of an isolated large Cu grain. The laser-reduction of CuO NRs was enhanced by the presence of GO, which is an effective reductive agent for metal oxide nano-materials. Raman spectroscopy showed the formation of a reduced graphene oxide (rGO) and the disappearance of CuO signals in the Raman spectrum of a laser-scanned GO/CuO NRs hybrid film. The formation of metallic Cu from CuO NRs was also confirmed by XPS Cu2p spectra, which showed the disappearance of satellite peaks assigned to CuO. A meander line antenna pattern was drawn by laser direct writing on a GO/CuO NRs hybrid film and then unirradiated area was removed by water etching. The antenna-type sensor showed resonance peaks in the region from 1 to 6 GHz. The changes of resonance frequency and return loss were studied by dropping various solvents on the antenna-type chemical sensor. A resonance peak at around 5.50 GHz was sensitive to the dielectric changes depending on the solvents. A remarkable enhancement of the return loss and resonance frequency shift was caused by a solvent with the higher dielectric constant. The return loss change and dielectric constant of solvent showed a clear relationship.

Paper Details

Date Published: 2 March 2020
PDF: 11 pages
Proc. SPIE 11268, Laser-based Micro- and Nanoprocessing XIV, 1126817 (2 March 2020); doi: 10.1117/12.2543768
Show Author Affiliations
Akira Watanabe, Tohoku Univ. (Japan)
Ashiqur Rahman, Tohoku Univ. (Japan)
American International Univ. Bangladesh (Bangladesh)
Jinguang Cai, China Academy of Engineering Physics (China)
Mohammod Aminuzzaman, Univ. Tunku Abdul Rahman (UTAR) (Malaysia)

Published in SPIE Proceedings Vol. 11268:
Laser-based Micro- and Nanoprocessing XIV
Udo Klotzbach; Akira Watanabe; Rainer Kling, Editor(s)

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