Effect of annealing on Raman spectra of monolayer graphene samples gradually disordered by ion irradiation : научное издание

Описание

Тип публикации: статья из журнала

Год издания: 2017

Идентификатор DOI: 10.1063/1.4978312

Аннотация: Raman scattering spectra (RS) of two series of monolayer graphene samples irradiated with various doses of C+ and Xe+ ions were measured after annealing in a high vacuum and in forming gas (95%Ar + 5%H2). It is shown that annealing below 500 °C leads to a significant decrease in both the D-line, associated with defects, and the 2D-Показать полностьюline, associated with the intact lattice structure. This can be explained by annealing-induced enhanced doping. Further annealing in a vacuum up to 1000 °C leads to a significant increase in the 2D-line together with a continuous decrease in the D-line. This gives evidence for the partial removal of the defects and restoration of the damaged lattice. Annealing in forming gas is less effective in this sense. A blue shift of all lines is observed after annealing. It is shown that below 500 °C, unintentional doping is the main origin of the shift. At higher annealing temperatures, the blue shift is mainly due to lattice strain arising because of mismatch between the thermal expansion coefficients of graphene and the substrate. Inhomogeneous distribution of stress and doping across the samples lead to the correlated variation of the height and peak position of RS lines.

Ссылки на полный текст

Издание

Журнал: Journal of Applied Physics

Выпуск журнала: Т. 121, 11

Номера страниц: 114301

ISSN журнала: 00218979

Издатель: American Institute of Physics

Авторы

  • Zion E. (Institute of Nanotechnology and Advanced Materials,Bar-Ilan University)
  • Butenko A. (Institute of Nanotechnology and Advanced Materials,Bar-Ilan University)
  • Richter V. (Institute of Nanotechnology and Advanced Materials,Bar-Ilan University)
  • Sharoni A. (Institute of Nanotechnology and Advanced Materials,Bar-Ilan University)
  • Kaganovskii Y. (Jack and Pearl Resnick Institute,Department of Physics,Bar-Ilan University)
  • Wolfson L. (Jack and Pearl Resnick Institute,Department of Physics,Bar-Ilan University)
  • Kogan E. (Jack and Pearl Resnick Institute,Department of Physics,Bar-Ilan University)
  • Kaveh M. (Jack and Pearl Resnick Institute,Department of Physics,Bar-Ilan University)
  • Shlimak I. (Jack and Pearl Resnick Institute,Department of Physics,Bar-Ilan University)

Вхождение в базы данных