Near-Infrared Photoluminescence Spectral Imaging of Chemically Oxidized Graphene Flakes

• Ueno Yuko

  NTT Microsystem Integration Laboratories, NTT Corporation, Japan

• Tamechika Emi

  NTT Microsystem Integration Laboratories, NTT Corporation, Japan

• Furukawa Kazuaki

  NTT Basic Research Laboratories, NTT Corporation, Japan

• Suzuki Satoru

  NTT Basic Research Laboratories, NTT Corporation, Japan

• Hibino Hiroki

  NTT Basic Research Laboratories, NTT Corporation, Japan

Abstract

In order to determine the local structure of carbon sp² clusters in chemically modified graphene oxide (GO) flakes, their luminescence was analyzed, using near-infrared photoluminescence (NIR PL) spectral imaging. GO flakes emit a broad PL spectrum of wavelengths of 800 to 1400 nm, indicating that they contain sp² clusters, whose size is theoretically estimated to be in the 1.3 to 2.3 nm region. The size distribution of such sp² clusters is fairly uniform at different positions and for different numbers of layers of GO, at the spatial resolution of NIR PL image (5μm). The analysis by transmission electron microscopy directly confirmed the existence of such sp² clusters and the estimated size of the sp² clusters was widely ranged from 0.5 to 4 nm. The effect of the GO reduction to the local structure of carbon sp² clusters was also studied and it was found that the NIR PL intensity decreased as the reduction progressed and that there was no large spectral shift. [DOI: 10.1380/ejssnt.2012.513]

Journal

• e-Journal of Surface Science and Nanotechnology

  e-Journal of Surface Science and Nanotechnology 10 (0), 513-517, 2012

  The Japan Society of Vacuum and Surface Science

Keywords

• Photoluminescence
• Raman scattering spectroscopy
• Surface structure, morphology, roughness, and topography

Details

• CRID: 1390001205186876672
• NII Article ID: 130004933754
• DOI: 10.1380/ejssnt.2012.513
• ISSN: 13480391
• Web Site: https://www.jstage.jst.go.jp/article/ejssnt/10/0/10_513/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed