Surface modification-induced phase transformation of hexagonal close-packed gold square sheets

Zhanxi Fan, Xiao Huang, Yu Han, Michel Bosman, Qingxiao Wang, Yihan Zhu, Qing Liu, Bing Li, Zhiyuan Zeng, Jumiati Wu, Wenxiong Shi, Shuzhou Li, Chee Lip Gan and Hua Zhang ()
Additional contact information
Zhanxi Fan: School of Materials Science and Engineering, Nanyang Technological University
Xiao Huang: School of Materials Science and Engineering, Nanyang Technological University
Yu Han: Advanced Membranes and Porous Materials Center, King Abdullah University of Science and Technology
Michel Bosman: Institute of Materials Research and Engineering (IMRE), A*STAR (Agency for Science, Technology and Research)
Qingxiao Wang: Imaging and Characterization Core Lab, King Abdullah University of Science and Technology
Yihan Zhu: Advanced Membranes and Porous Materials Center, King Abdullah University of Science and Technology
Qing Liu: Nanyang Technological University, Temasek Laboratories@NTU, 9th Storey, BorderX Block, Research Techno Plaza 50 Nanyang Drive
Bing Li: Institute of Materials Research and Engineering (IMRE), A*STAR (Agency for Science, Technology and Research)
Zhiyuan Zeng: School of Materials Science and Engineering, Nanyang Technological University
Jumiati Wu: School of Materials Science and Engineering, Nanyang Technological University
Wenxiong Shi: School of Materials Science and Engineering, Nanyang Technological University
Shuzhou Li: School of Materials Science and Engineering, Nanyang Technological University
Chee Lip Gan: School of Materials Science and Engineering, Nanyang Technological University
Hua Zhang: School of Materials Science and Engineering, Nanyang Technological University

Nature Communications, 2015, vol. 6, issue 1, 1-9

Abstract: Abstract Conventionally, the phase transformation of inorganic nanocrystals is realized under extreme conditions (for example, high temperature or high pressure). Here we report the complete phase transformation of Au square sheets (AuSSs) from hexagonal close-packed (hcp) to face-centered cubic (fcc) structures at ambient conditions via surface ligand exchange, resulting in the formation of (100)f-oriented fcc AuSSs. Importantly, the phase transformation can also be realized through the coating of a thin metal film (for example, Ag) on hcp AuSSs. Depending on the surfactants used during the metal coating process, two transformation pathways are observed, leading to the formation of (100)f-oriented fcc Au@Ag core-shell square sheets and (110)h/(101)f-oriented hcp/fcc mixed Au@Ag nanosheets. Furthermore, monochromated electron energy loss spectroscopy reveals the strong surface plasmon resonance absorption of fcc AuSS and Au@Ag square sheet in the infrared region. Our findings may offer a new route for the crystal-phase and shape-controlled synthesis of inorganic nanocrystals.

Date: 2015
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DOI: 10.1038/ncomms7571

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