Tip-enhanced Raman spectroscopy of nanostructures on epitaxial graphene and graphene microisland

Sanpon Vantasin; Toshiaki Suzuki; Yoshito Tanaka; Yasutaka Kitahama; Shohei Uemura; Doujima Daichi; Tadaaki Kaneko; Yukihiro Ozaki

doi:10.1117/12.2237536

15 September 2016 Tip-enhanced Raman spectroscopy of nanostructures on epitaxial graphene and graphene microisland

Sanpon Vantasin, Toshiaki Suzuki, Yoshito Tanaka, Yasutaka Kitahama, Shohei Uemura, Doujima Daichi, Tadaaki Kaneko, Yukihiro Ozaki

Author Affiliations +

Proceedings Volume 9925, Nanoimaging and Nanospectroscopy IV; 99250Q (2016) https://doi.org/10.1117/12.2237536
Event: SPIE Nanoscience + Engineering, 2016, San Diego, California, United States

Abstract

Despite often illustrated as a perfect two-dimensional sheet, real graphene sample is not always flat. Nanostructures can be occurred on graphene sheet, especially for epitaxial graphene. The nanostructures alter the electrical and mechanical properties of graphene. This is crucial for epitaxial graphene since its main potential is in the electronics and optics application. This study investigates nanostructures on epitaxial graphene by tip-enhanced Raman spectroscopy, which is a technique that can provide Raman spectra with great spatial resolution, exceeding the diffraction limit of light. The results suggest that the compressive strain on nanoridges is weaker compared to neighbor flat area, supporting the ‘ridge as compressive strain relaxation’ mechanism. TERS measurement of nanoridges on epitaxial graphene microisland also indicates that the ‘Si vapor trapping’ mechanism for ridge formation is unlikely to occur.

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Citation Download Citation

Sanpon Vantasin, Toshiaki Suzuki, Yoshito Tanaka, Yasutaka Kitahama, Shohei Uemura, Doujima Daichi, Tadaaki Kaneko, and Yukihiro Ozaki "Tip-enhanced Raman spectroscopy of nanostructures on epitaxial graphene and graphene microisland", Proc. SPIE 9925, Nanoimaging and Nanospectroscopy IV, 99250Q (15 September 2016); https://doi.org/10.1117/12.2237536

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