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Dong, Jichen
다차원 탄소재료 연구단
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Insights into the Mechanism for Vertical Graphene Growth by Plasma-Enhanced Chemical Vapor Deposition

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Title
Insights into the Mechanism for Vertical Graphene Growth by Plasma-Enhanced Chemical Vapor Deposition
Author(s)
Sun, Jie; Rattanasawatesun, Tanupong; Tang, Penghao; Bi, Zhaoxia; Pandit, Santosh; Lam, Lisa; Wasén, Caroline; Erlandsson, Malin; Bokarewa, Maria; Jichen Dong; Feng Ding; Xiong, Fangzhu; Mijakovic, Ivan
Publication Date
2022-02
Journal
ACS Applied Materials and Interfaces, v.14, no.5, pp.7152 - 7160
Publisher
American Chemical Society
Abstract
© 2021 American Chemical Society. All rights reserved.Vertically oriented graphene (VG) has attracted attention for years, but the growth mechanism is still not fully revealed. The electric field may play a role, but the direct evidence and exactly what role it plays remains unclear. Here, we conduct a systematic study and find that in plasma-enhanced chemical vapor deposition, the VG growth preferably occurs at spots where the local field is stronger, for example, at GaN nanowire tips. On almost round-shaped nanoparticles, instead of being perpendicular to the substrate, the VG grows along the field direction, that is, perpendicular to the particles' local surfaces. Even more convincingly, the sheath field is screened to different degrees, and a direct correlation between the field strength and the VG growth is observed. Numerical calculation suggests that during the growth, the field helps accumulate charges on graphene, which eventually changes the cohesive graphene layers into separate three-dimensional VG flakes. Furthermore, the field helps attract charged precursors to places sticking out from the substrate and makes them even sharper and turn into VG. Finally, we demonstrate that the VG-covered nanoparticles are benign to human blood leukocytes and could be considered for drug delivery. Our research may serve as a starting point for further vertical two-dimensional material growth mechanism studies.
URI
https://pr.ibs.re.kr/handle/8788114/11237
DOI
10.1021/acsami.1c21640
ISSN
1944-8244
Appears in Collections:
Center for Multidimensional Carbon Materials(다차원 탄소재료 연구단) > 1. Journal Papers (저널논문)
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