A Low-Energy Electron Beam Does Not Damage Single-Walled Carbon Nanotubes and Graphene

Citation data:

The Journal of Physical Chemistry Letters, ISSN: 1948-7185, Vol: 7, Issue: 22, Page: 4739-4743

Publication Year:
2016
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Repository URL:
http://scholarworks.unist.ac.kr/handle/201301/21028
DOI:
10.1021/acs.jpclett.6b02185
Author(s):
Choi, Jae Hong, Lee, Junghyun, Moon, Seung Min, Kim, Yun-Tae, Park, Hyesung, Lee, Chang Young
Publisher(s):
American Chemical Society (ACS), AMER CHEMICAL SOC
Tags:
Materials Science
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article description
Scanning electron microscopy (SEM) is a principal tool for studying nanomaterials, including carbon nanotubes and graphene. Imaging carbon nanomaterials by SEM, however, increases the disorder mode (D-mode) in their Raman spectra. Early studies, which relied on ambiguous ensemble measurements, claimed that the D-mode indicates damage to the specimens by a low-energy electron beam (e-beam). This claim has been accepted by the nanomaterials community for more than a decade without thorough examination. Here we demonstrate that a low-energy e-beam does not damage carbon nanomaterials. By performing measurements on single nanotubes, we independently examined the following factors: (1) the e-beam irradiation itself, (2) the e-beam-deposited hydrocarbon, and (3) the amorphous carbon deposited during synthesis of the material. We concluded that the e-beam-induced D-mode of both carbon nanotubes and graphene originates solely from the irradiated amorphous carbon and not from the e-beam itself or the hydrocarbon. The results of this study should help minimize potential ambiguities for researchers imaging a broad range of nanomaterials by electron microscopy.