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Synthesis and Characterization of Potassium-doped Multilayer Graphene Prepared by Wet Process Using Potassium Hydroxide by Tomoaki Masuzawa; Yuki Okigawa; Shuichi Ogawa; Yuji Takakuwa; Kazuto Hatakeyama; Takatoshi Yamada is a scholarly article available to read on EtoBox.

What is Synthesis and Characterization of Potassium-doped Multilayer Graphene Prepared by Wet Process Using Potassium Hydroxide about?

## Abstract Potassium (K) doping of multilayer graphene was demonstrated by means of a wet chemical process using potassium hydroxide (KOH) aqueous solution (KOH treatment). The presence of K atoms along the stacking direction was confirmed from depth profiles of ^41^K^+^ ions obtained by time-of-flight secondary ion mass spectroscopy (TOF-SIMS). The intensity images of ^41^K^+^ ions obtained by TOF-SIMS suggested that the K atoms existed throughout the whole area. For the KOH-treated multilayer graphene, no peak due to K intercalation between graphene layers was obtained by x-ray diffraction (XRD); in Raman spectra, splitting of the G-band peak and disappearance of the 2D-band peak were not observed. A graphite intercalation compound structure was not determined by either XRD or Raman results. However, the up-shift in the G-band peak position in the Raman spectra suggested that K atoms were doped in the graphene. X-ray photoelectron spectroscopy carbon 1s spectra implied that KOH treatment resulted in K-termination at the edges and/or domains of graphene. In addition, a C1s shoulder peak appeared at 1 eV higher binding energy compared to the C1s peak of pristine graphene. Temperat

Author

Tomoaki Masuzawa; Yuki Okigawa; Shuichi Ogawa; Yuji Takakuwa; Kazuto Hatakeyama; Takatoshi Yamada

Publisher

IOP Publishing

Published

2021

Language

EN