Formation of graphene hybrid structures by laser direct writing and sensor applications

Akira Watanabe, Ashiqur Rahman, Jinguang Cai, Mohammod Aminuzzaman

研究成果: Conference contribution

1 被引用数 (Scopus)

抄録

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.

本文言語English
ホスト出版物のタイトルLaser-Based Micro- and Nanoprocessing XIV
編集者Udo Klotzbach, Akira Watanabe, Rainer Kling
出版社SPIE
ISBN(電子版)9781510632998
DOI
出版ステータスPublished - 2020
イベントLaser-Based Micro- and Nanoprocessing XIV 2020 - San Francisco, United States
継続期間: 2020 2 32020 2 6

出版物シリーズ

名前Proceedings of SPIE - The International Society for Optical Engineering
11268
ISSN(印刷版)0277-786X
ISSN(電子版)1996-756X

Conference

ConferenceLaser-Based Micro- and Nanoprocessing XIV 2020
国/地域United States
CitySan Francisco
Period20/2/320/2/6

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学
  • コンピュータ サイエンスの応用
  • 応用数学
  • 電子工学および電気工学

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