One-pot size-controlled growth of graphene-encapsulated germanium nanocrystals

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Title
One-pot size-controlled growth of graphene-encapsulated germanium nanocrystals
Author(s)
Jae-Hyun Lee; Eun-Kyung Lee; Seong-Gyun Kang; Su-Ho Jung; Seok-Kyun Son; Woo Hyun Nam; Tae-Hoon Kim; Byong Lyong Choi; Dongmok Whang
Publication Date
2018-01
Journal
APPLIED SURFACE SCIENCE, v.440, no., pp.553 - 559
Publisher
ELSEVIER SCIENCE BV
Abstract
To realize graphene-encapsulated semiconductor nanocrystals (NCs), an additional graphene coating process, which causes shape destruction and chemical contamination, has so far been inevitable. We report herein one-pot growth of uniform graphene-germanium core–shell nanocrystals (Ge@G NCs) in gram scale by the addition of methane as a carbon source during the thermal pyrolysis of germane. The methane plays a critical role in the growth of the graphene shell, as well as in the determination of the nucleation density and diameter of the NCs, similar to a surfactant in the liquid-phase growth of monodisperse NCs. By adjusting the gas ratio of precursors, a mixture of germane and methane, we can control the size of the Ge@G NCs in the range of ∼5–180 nm. The Ge@G NCs were characterized by various microscopic and spectroscopic tools, which indicated that the Ge core is single crystalline, and is completely covered by the graphene shell. We further investigated the merits of the graphene shell, which can enhance the electrical conductivity of nanocrystalline materials. (c)2018 Elsevier B.V. All rights reserved
URI
https://pr.ibs.re.kr/handle/8788114/4701
ISSN
0169-4332
Appears in Collections:
Center for Nanomaterials and Chemical Reactions(나노물질 및 화학반응 연구단) > Journal Papers (저널논문)
Files in This Item:
Applied Surface Science 440 (2018) 553–559.pdfDownload

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