Author/Authors :
Campos-Delgado، نويسنده , , J. and Kim، نويسنده , , Y.A. and Hayashi، نويسنده , , T. and Morelos-Gَmez، نويسنده , , A. and Hofmann، نويسنده , , M. and Muramatsu، نويسنده , , H. and Endo، نويسنده , , Sofia M. and Terrones، نويسنده , , H. and Shull، نويسنده , , R.D. and Dresselhaus، نويسنده , , M.S. and Terrones، نويسنده , , M.، نويسنده ,
Abstract :
We present a high temperature heat treatment study of CVD-grown graphene nanoribbons annealed up to 2800 °C, demonstrating a progressive annihilation of lattice defects as the heat treatment temperature is raised. Starting at 1500 °C, single and multiple loop formation were observed on the ribbons edges as the temperature was increased. The structural changes of the samples are documented by X-ray diffraction, Raman spectroscopy, TGA, SEM, and HRTEM. This work indicates that nanoribbon annealing eventually leads to defect-free samples, through graphitization and edge loop formation. The annealed material exhibits structural differences that could be tailored for a variety of specific applications.
