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Toward Clean Suspended CVD Graphene

Published

Author(s)

Alexander Yulaev, Guangjun Cheng, Angela R. Hight Walker, Ivan Vlassiouk, Alline F. Myers, Marina S. Leite, Andrei A. Kolmakov

Abstract

The application of suspended graphene as electron transparent supporting media in electron microscopy, vacuum electronics, and micromechanical devices requires the least destructive and maximally clean transfer from their original growth substrate to the target of interest. Here, we use thermally evaporated anthracene films as the sacrificial layer for graphene transfer onto an arbitrary substrate. We show that clean suspended graphene can be achieved via desorbing the anthracene layer at temperatures in the 100 oC to 150 oC range, followed by two sequential annealing steps for the final cleaning, using Pt catalyst and activated carbon. The cleanliness of the suspended graphene membranes was analyzed employing the high surface sensitivity of low energy scanning electron microscopy and x-ray photoelectron spectroscopy. A quantitative comparison with two other commonly used transfer methods revealed the superiority of the anthracene approach to obtain larger area of clean, suspended CVD graphene. Our solvent-free method of graphene transfer onto arbitrary substrates paves the way for integrating graphene in complex devices that are not compatible with wet treatments.
Citation
RSC Advances
Volume
6
Issue
87

Keywords

graphene transfer, anthracene, purity, scanning electron microscopy

Citation

Yulaev, A. , Cheng, G. , Hight, A. , Vlassiouk, I. , Myers, A. , Leite, M. and Kolmakov, A. (2016), Toward Clean Suspended CVD Graphene, RSC Advances, [online], https://doi.org/10.1039/C6RA17360H (Accessed July 31, 2021)
Created August 26, 2016, Updated November 10, 2018