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Communication

Epitaxial Growth of Diamond-Shaped Au1/2Ag1/2CN Nanocrystals on Graphene

by 1,†, 1,†, 2,* and 1,*
1
Department of Mechanical Engineering, BK21 FOUR ERICA-ACE Center, Hanyang University, 55 Hanyangdaehak-ro, Sangnok-gu, Ansan 15588, Korea
2
Department of Mechanical Engineering and Integrated Education Institute for Frontier Science & Technology, Kyung Hee University, 1732 Deokyoungdae-ro, Giheung-gu, Yongin 17104, Korea
*
Authors to whom correspondence should be addressed.
Equally contributed authors.
Academic Editor: Giorgio Biasiol
Materials 2021, 14(24), 7569; https://doi.org/10.3390/ma14247569
Received: 28 October 2021 / Revised: 29 November 2021 / Accepted: 7 December 2021 / Published: 9 December 2021
Epitaxial synthesis of inorganic nanomaterials on pristine 2D materials is of interest in the development of nanostructured devices and nanocomposite materials, but is quite difficult because pristine surfaces of 2D materials are chemically inert. Previous studies found a few exceptions including AuCN, AgCN, CuCN, and Cu0.5Au0.5CN, which can be preferentially synthesized and epitaxially aligned onto various 2D materials. Here, we discover that Au1/2Ag1/2CN forms diamond-shaped nanocrystals epitaxially grown on pristine graphene surfaces. The nanocrystals synthesized by a simple drop-casting method are crystallographically aligned to lattice structures of the underlying graphene. Our experimental investigations on 3D structures and the synthesis conditions of the nanocrystals imply that the rhombic 2D geometries originate from different growth rates depending on orientations along and perpendicular to 1D molecular chains of Au1/2Ag1/2CN. We also perform in situ TEM observations showing that Au1/2Ag1/2CN nanocrystals are decomposed to Au and Ag alloy nanocrystals under electron beam irradiation. Our experimental results provide an additional example of 1D cyanide chain families that form ordered nanocrystals epitaxially aligned on 2D materials, and reveal basic physical characteristics of this rarely investigated nanomaterial. View Full-Text
Keywords: metal cyanide; Au1/2Ag1/2CN; rhombic nanocrystal; van der Waals epitaxy; graphene; epitaxial alignment metal cyanide; Au1/2Ag1/2CN; rhombic nanocrystal; van der Waals epitaxy; graphene; epitaxial alignment
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MDPI and ACS Style

Park, C.; Ham, J.; Heo, Y.J.; Lee, W.C. Epitaxial Growth of Diamond-Shaped Au1/2Ag1/2CN Nanocrystals on Graphene. Materials 2021, 14, 7569. https://doi.org/10.3390/ma14247569

AMA Style

Park C, Ham J, Heo YJ, Lee WC. Epitaxial Growth of Diamond-Shaped Au1/2Ag1/2CN Nanocrystals on Graphene. Materials. 2021; 14(24):7569. https://doi.org/10.3390/ma14247569

Chicago/Turabian Style

Park, Chunggeun, Jimin Ham, Yun J. Heo, and Won C. Lee. 2021. "Epitaxial Growth of Diamond-Shaped Au1/2Ag1/2CN Nanocrystals on Graphene" Materials 14, no. 24: 7569. https://doi.org/10.3390/ma14247569

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