Growth of umbrella-like millimeter-scale single-crystalline graphene on liquid copper

被引：12

作者：

Zhang, Chitengfei ^{[1
]}

Tu, Rong ^{[1
]}

Dong, Mingdong ^{[2
]}

Li, Jun ^{[3
]}

Yang, Meijun ^{[1
]}

Li, Qizhong ^{[4
]}

Shi, Ji ^{[1
,5
]}

Li, Haiwen ^{[1
,6
]}

Ohmori, Hitoshi ^{[1
,7
]}

Zhang, Song ^{[1
]}

Zhang, Lianmeng ^{[1
]}

Goto, Takashi ^{[1
]}

机构：

[1] Wuhan Univ Technol, State Key Lab Adv Technol Mat Synth & Proc, 122 Luoshi Rd, Wuhan 430070, Hubei, Peoples R China

[2] Aarhus Univ, Interdisciplinary Nanosci Ctr iNANO, DK-8000 Aarhus, Denmark

[3] Inst Fluid Phys, Natl Key Lab Shock Wave & Detonat Phys, POB 919-102, Mianyang 621900, Sichuan, Peoples R China

[4] Wuhan Univ Technol, Hubei Key Lab Adv Technol Automobile Parts, 122 Luoshi Rd, Wuhan 430070, Hubei, Peoples R China

[5] Tokyo Inst Technol, Sch Mat & Chem Technol, Tokyo 1528552, Japan

[6] Kyushu Univ, Int Res Ctr Hydrogen Energy, Fukuoka 8190395, Japan

[7] Inst Phys & Chem Res, 2-1 Hirosawa, Wako, Saitama 3510198, Japan

来源：

CARBON | 2019年 / 150卷

基金：

对外科技合作项目（国际科技项目）; 中国国家自然科学基金;

关键词：

CHEMICAL-VAPOR-DEPOSITION; MULTILAYER GRAPHENE; TRILAYER GRAPHENE; LAYER GRAPHENE; BILAYER; SIZE; TRANSISTORS; MORPHOLOGY; MONOLAYER; DOMAINS;

D O I：

10.1016/j.carbon.2019.05.013

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Novel single-crystalline umbrella-like graphene (ULG) domains with the diameter up to 0.6 mm were achieved on liquid copper by atmospheric pressure chemical vapor deposition (APCVD). ULG exhibits 6-fold symmetry with 6 ribs. Raman spectroscopy analysis revealed that the ULG was few-layer graphene with ultralow level of defects. Scanning Tunneling Microscope (STM) and selected area electron diffraction (SAED) results shown the single-crystalline nature of ULG. Transmission electron microscopy (TEM) shown the thickness of the panel was 3.5 nm and the thickness of the rib varied gradiently from 11.22 nm to 5.44 nm. The growth mechanism of the ULG was also explored by studying the influence of varied methane and hydrogen flow, which shows the ULG was formed during the nucleation stage. The larger flow of hydrogen supported decreasing the nucleation density of ULG, which was preferred for the formation of large domain ULG. Moreover, ULG partially immersed into liquid copper during the nucleation stage, thus, carbon atoms could reach each layer of ULG, leading to the continual growth of ULG graphene. (C) 2019 Elsevier Ltd. All rights reserved.

引用

页码：356 / 362

页数：7

共 56 条

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