Growth and Selective Etching of Twinned Graphene on Liquid Copper Surface

Fengning Liu; Jichen Dong; Na Yeon Kim; Zonghoon Lee; Feng Ding

doi:10.1002/smll.202103484

Growth and Selective Etching of Twinned Graphene on Liquid Copper Surface

Fengning Liu, Jichen Dong, Na Yeon Kim, Zonghoon Lee, Feng Ding

Research output: Contribution to journal › Article › peer-review

9 Scopus citations

Abstract

Although grain boundaries (GBs) in two-dimensional (2D) materials have been extensively observed and characterized, their formation mechanism still remains unexplained. Here a general model has reported to elucidate the mechanism of formation of GBs during 2D materials growth. Based on our model, a general method is put forward to synthesize twinned 2D materials on a liquid substrate. Using graphene growth on liquid Cu surface as an example, the growth of twinned graphene has been demonstrated successfully, in which all the GBs are ultra-long straight twin boundaries. Furthermore, well-defined twin boundaries (TBs) are found in graphene that can be selectively etched by hydrogen gas due to the preferential adsorption of hydrogen atoms at high-energy twins. This study thus reveals the formation mechanism of GBs in 2D materials during growth and paves the way to grow various 2D nanostructures with controlled GBs.

Original language	English
Article number	2103484
Journal	Small
Volume	17
Issue number	40
DOIs	https://doi.org/10.1002/smll.202103484
State	Published - Oct 7 2021
Externally published	Yes

Funding

F.L., J.D., and N.K. contributed equally to this work. This work was supported by IBS‐R019‐D1 and the usage of IBS‐CMCM high performance computing system, Cimulator. The support from the Chinese Academy of Sciences was also acknowledged.

Funders	Funder number
Chinese Academy of Sciences

Keywords

2D materials
chemical vapor deposition
etching
grain boundaries
graphene

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10.1002/smll.202103484

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title = "Growth and Selective Etching of Twinned Graphene on Liquid Copper Surface",

abstract = "Although grain boundaries (GBs) in two-dimensional (2D) materials have been extensively observed and characterized, their formation mechanism still remains unexplained. Here a general model has reported to elucidate the mechanism of formation of GBs during 2D materials growth. Based on our model, a general method is put forward to synthesize twinned 2D materials on a liquid substrate. Using graphene growth on liquid Cu surface as an example, the growth of twinned graphene has been demonstrated successfully, in which all the GBs are ultra-long straight twin boundaries. Furthermore, well-defined twin boundaries (TBs) are found in graphene that can be selectively etched by hydrogen gas due to the preferential adsorption of hydrogen atoms at high-energy twins. This study thus reveals the formation mechanism of GBs in 2D materials during growth and paves the way to grow various 2D nanostructures with controlled GBs.",

keywords = "2D materials, chemical vapor deposition, etching, grain boundaries, graphene",

author = "Fengning Liu and Jichen Dong and Kim, {Na Yeon} and Zonghoon Lee and Feng Ding",

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T1 - Growth and Selective Etching of Twinned Graphene on Liquid Copper Surface

AU - Liu, Fengning

AU - Dong, Jichen

AU - Kim, Na Yeon

AU - Lee, Zonghoon

AU - Ding, Feng

PY - 2021/10/7

Y1 - 2021/10/7

N2 - Although grain boundaries (GBs) in two-dimensional (2D) materials have been extensively observed and characterized, their formation mechanism still remains unexplained. Here a general model has reported to elucidate the mechanism of formation of GBs during 2D materials growth. Based on our model, a general method is put forward to synthesize twinned 2D materials on a liquid substrate. Using graphene growth on liquid Cu surface as an example, the growth of twinned graphene has been demonstrated successfully, in which all the GBs are ultra-long straight twin boundaries. Furthermore, well-defined twin boundaries (TBs) are found in graphene that can be selectively etched by hydrogen gas due to the preferential adsorption of hydrogen atoms at high-energy twins. This study thus reveals the formation mechanism of GBs in 2D materials during growth and paves the way to grow various 2D nanostructures with controlled GBs.

AB - Although grain boundaries (GBs) in two-dimensional (2D) materials have been extensively observed and characterized, their formation mechanism still remains unexplained. Here a general model has reported to elucidate the mechanism of formation of GBs during 2D materials growth. Based on our model, a general method is put forward to synthesize twinned 2D materials on a liquid substrate. Using graphene growth on liquid Cu surface as an example, the growth of twinned graphene has been demonstrated successfully, in which all the GBs are ultra-long straight twin boundaries. Furthermore, well-defined twin boundaries (TBs) are found in graphene that can be selectively etched by hydrogen gas due to the preferential adsorption of hydrogen atoms at high-energy twins. This study thus reveals the formation mechanism of GBs in 2D materials during growth and paves the way to grow various 2D nanostructures with controlled GBs.

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Growth and Selective Etching of Twinned Graphene on Liquid Copper Surface

Abstract

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Keywords

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