View : 97 Download: 0

Remote homoepitaxy of ZnO microrods across graphene layers

Title
Remote homoepitaxy of ZnO microrods across graphene layers
Authors
Jeong J.Min K.-A.Shin D.H.Yang W.S.Yoo J.Lee S.W.Hong S.Hong Y.J.
Ewha Authors
이상욱신동훈
SCOPUS Author ID
이상욱scopus; 신동훈scopus
Issue Date
2018
Journal Title
Nanoscale
ISSN
2040-3364JCR Link
Citation
Nanoscale vol. 10, no. 48, pp. 22970 - 22980
Publisher
Royal Society of Chemistry
Indexed
SCI; SCIE; SCOPUS WOS scopus
Document Type
Article
Abstract
Two-dimensional atomic layered materials (2d-ALMs) are emerging candidates for use as epitaxial seed substrates for transferrable epilayers. However, the micrometer-sized domains of 2d-ALMs preclude their practical use in epitaxy because they cause crystallographically in-plane disordering of the overlayer. Ultrathin graphene can penetrate the electric dipole momentum from an underlying crystal layer to the graphene surface, which then drives it to crystallize the overlayer during the initial growth stage, thus resulting in substantial energy saving. This study demonstrates the remote homoepitaxy of ZnO microrods (MRs) on ZnO substrates across graphene layers via a hydrothermal method. Despite the presence of poly-domain graphene in between the ZnO substrate and ZnO MRs, the MRs were epitaxially grown on a- and c-plane ZnO substrates, whose in-plane alignments were homogeneous within the wafer's size. Transmission electron microscopy revealed a homoepitaxial relationship between the overlayer MRs and the substrate. Density-functional theory calculations suggested that the charge redistribution occurring near graphene induces the electric dipole formation, so the attracted adatoms led to the formation of the remote homoepitaxial overlayer. Due to a strong potential field caused by long-range charge transfer given from the substrate, even the use of bi-layer and tri-layer graphene resulted in remote homoepitaxial ZnO MRs. The effects of substrate crystal planes were also theoretically and empirically investigated. The ability of graphene, which can be released from the mother substrate without covalent bonds, was utilized to transfer the overlayer MR arrays. This method opens a way for producing well aligned, transferrable epitaxial nano/microstructure arrays while regenerating the substrate for cost-saving device manufacturing. © 2018 The Royal Society of Chemistry.
DOI
10.1039/c8nr08084d
Appears in Collections:
자연과학대학 > 물리학전공 > Journal papers
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE