凯发_Yunqi Liu

Speaker-Yunqi Liu

Yunqi Liu
Researcher of Institute of Chemistry, CAS, China

Yunqi Liu is a professor in the Institute of Chemistry, CAS, China. He was born in 1949 in Jiangsu province, China. He graduated from the Department of Chemistry, Nanjing University in 1975, and received a doctorate from the Tokyo Institute of Technology, Japan in 1991.

His research interests cover the synthesis of molecular materials, including p-conjugated small molecules, polymers, and graphene; fabrication of related devices, including field-effect transistors and molecular electronics; and investigation of their electronic properties. He has published over 500 peer-reviewed papers with more than 11,000 citations and an h-index of 62. He edits one book and also is co-author of 18 book chapters and co-inventor on over 60 patents. His achievements have been recognized with several awards including the 2007 National Natural Prize.

Title：Controllable Growth of Single-crystal Graphene Domains by Chemistry Vapor Deposition

SymposiumGrowth of Large-Size Single-Crystal Graphene Domains

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Abstract

The final goal for the control synthesis of graphene is to get large-size, single-crystal and monolayer (or the number of layers can be controlled) graphene. For this end, a lot of synthetic methods have been developed. Among them, chemical vapor deposition (CVD) has been recognized as a promising one since it combines high quality and large quantity of the product. A typical CVD process of graphene synthesis processes two basic stages, nucleation and growth, in which the randomly distributed graphene nuclei would continue to grow and eventually merge into film. Compared with the graphene film composed of numerous grain boundaries, single-crystal graphene domain is more important for electronic applications and could exhibit more outstanding device performance due to the absence of defects.

Here, I report the controllable synthesis of graphene by CVD and investigation of its electronic properties.[1-15] A large scale synthesis of equiangular hexagon-shaped single or multilayer graphene by methane CVD on solid Cu surface at ambient pressure. A new method of using liquid Cu as a catalyst to synthesize graphene flakes and uniform film was developed (Figure 1). The liquid characteristic of the liquid Cu allows the control of graphene nucleation due to the less grain boundary comparing to solid Cu surface, thus leads to large single-crystal graphene domains. The single-layered and single-crystalline graphene flakes with highly regular and hexagonal symmetric patterns can be grown on a liquid copper surface (Figure 2).

References:

[1] Jianyi Chen, Yunlong Guo, Lili Jiang, Zhiping Xu, Liping Huang, Yunzhou Xue, Dechao Geng, Bin Wu, Wenping Hu, Gui Yu, and Yunqi Liu, Adv. Mater., 2014, 26(9), 1348-1353.

[2] Lifeng Wang, Bin Wu, Jisi Chen, Hongtao Liu, Pingan Hu, and Yunqi Liu, Adv. Mater., 2014, 26(10), 1559-1564.

[3] Birong Luo, Bingyan Chen, Lan Meng, Dechao Geng, Hongtao Liu, Jie Xu, Zhiyong Zhang, Hantang Zhang, Lianmao Peng, Lin He, Wenping Hu, Yunqi Liu, and Gui Yu, Adv. Mater., 2014, 26(20), 3218-3224.

[4] Dechao Geng, Birong Luo, Jie Xu, Yunlong Guo, Bin Wu, Wenping Hu, Yunqi Liu, and Gui Yu, Adv. Funct.Mater., 2014, 24(12), 1664-1670.

[5] Lili Jiang, Tianzhong Yang, Fei Liu, Chengmin Shen, Shaozhi Deng, Ningsheng Xu, Yunqi Liu, and Hong-junGao, Adv. Mater., 2013, 25(2), 250-255.

[6] Dacheng Wei, Bin Wu, Yunlong Guo, Gui Yu, and Yunqi Liu, Acc. Chem. Res., 2013, 46(1), 106-115.

[7] Dacheng Wei, Lanfei Xie, Kian Keat Lee, Zhibin Hu, Shihua Tan, Wei Chen, Chorng Haur Sow, Keqiu Chen, Yunqi Liu, and Andrew Thye Shen Wee, Nature. Commun., 2013, 4, 1374.

[8] Bin Wu, Dechao Geng, Zhiping Xu, Yunlong Guo, Liping Huang, Yunzhou Xue, Jianyi Chen, Gui Yu and Yunqi Liu, NPG Asia Mater., 2013, 5, e36.

[9] Jianyi Chen, Yunlong Guo, Yugeng Wen, Liping Huang, Yunzhou Xue, Dechao Geng, Bin Wu, Birong Luo, Gui Yu, Yunqi Liu, Adv. Mater., 2013, 25(7), 992–997.

[10] Dechao Geng, Bin Wu, Yunlong Guo, Birong Luo, Yunzhou Xue, Jianyi Chen, Gui Yu, Yunqi Liu, J. Am. Chem. Soc., 2013, 135(17), 6431–6434.

[11] Lang Jiang, Tianchao Niu, Xiuqiang Lu, Huanli Dong, Wei Chen, Yunqi Liu, Wenping Hu, and Daoben Zhu, J.Am. Chem. Soc., 2013, 135(24), 9050–9054.

[12] Lili Jiang, Bin Wu, Hongtao Liu, Yuan Huang, Jianyi Chen, Dechao Geng, Hongjun Gao, and Yunqi Liu, Adv. Mater., 2013, 25(48), 7015-7019.

[13] Dechao Geng, Bin Wu, Yunlong Guo, Liping Huang, Yunzhou Xue, Jianyi Chen, Gui Yu, Lang Jiang, Wenping Hu, Yunqi Liu, Proc. Natl. Acad. Sci. USA, 2012, 109(21), 7992–7996.

[14] Yunzhou Xue, Bin Wu, Lang Jiang, Yunlong Guo, Liping Huang, Jianyi Chen, Jiahui Tan, Dechao Geng, Birong Luo, Wenping Hu, Gui Yu, and Yunqi Liu, J. Am. Chem. Soc., 2012, 134(27), 11060–11063.

[15] Lei Zhang, Hongtao Liu, Yan Zhao, Xiangnan Sun, Yugeng Wen, Yunlong Guo, Xike Gao, Chong-an Di, Gui Yu, and Yunqi Liu, Adv. Mater., 2012, 24(3), 436-440.