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Mark Hermann Rummeli
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Synthesis and characterization of carbon nanowalls on different substrates by radio frequency plasma enhanced chemical vapor deposition

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Title
Synthesis and characterization of carbon nanowalls on different substrates by radio frequency plasma enhanced chemical vapor deposition
Author(s)
Keivan Davami; Mehrdad Shaygan; Nazli Kheirabi; Jiong Zhao; Daria A. Kovalenko; Mark H. Rummeli; Joerg Opitz; Gianaurelio Cuniberti; Jeong-Soo Lee; M. Meyyappan
Publication Date
2014-06
Journal
CARBON, v.72, no., pp.372 - 380
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Abstract
A radio frequency plasma enhanced chemical vapor deposition system was used for the successful growth of thin vertical carbon nanowalls, also known as vertical graphene, on various substrates. Transmission electron microscopy studies confirmed the presence of vertical graphene walls, which are tapered, typically consisting of 10 layers at the base tapering off to 2 or 3 layers at the top. The sides of the walls are facetted at quantized angles of 30 and the facetted sides are usually seamless. Growth occurs at the top open edge which is not facetted. Hydrogen induced etching allows for nucleation of branch walls apparently involving a carbon onion-like structure at the root base. Characterization by a superconducting quantum interference device showed magnetic hysteresis loops and weak ferromagnetic responses from the samples at room temperature and below. Temperature dependence of the magnetization revealed a magnetic phase transition around T = 50 K highlighting the coexistence of antiferromagnetic interactions as well as ferromagnetic order.
URI
https://pr.ibs.re.kr/handle/8788114/999
ISSN
0008-6223
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > Journal Papers (저널논문)
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