title: Synthesis of ultrathin face-centered-cubic au@pt and au@pd core-shell nanoplates from hexagonal-close-packed au square sheets.
abstract: The synthesis of ultrathin face-centered-cubic (fcc) Au@Pt rhombic nanoplates is reported through the epitaxial growth of Pt on hexagonal-close-packed (hcp) Au square sheets (AuSSs). The Pt-layer growth results in a hcp-to-fcc phase transformation of the AuSSs under ambient conditions. Interestingly, the obtained fcc Au@Pt rhombic nanoplates demonstrate a unique (101)f orientation with the same atomic arrangement extending from the Au core to the Pt shell. Importantly, this method can be extended to the epitaxial growth of Pd on hcp AuSSs, resulting in the unprecedented formation of fcc Au@Pd rhombic nanoplates with (101)f orientation. Additionally, a small amount of fcc (100)f -oriented Au@Pt and Au@Pd square nanoplates are obtained with the Au@Pt and Au@Pd rhombic nanoplates, respectively. We believe that these findings will shed new light on the synthesis of novel noble bimetallic nanostructures.
authors.affiliation: School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798 (Singapore) http://www.ntu.edu.sg/home/hzhang/
authors.forename: Zhanxi
authors.initials: Z
authors.lastname: Fan
authors.forename: Yihan
authors.initials: Y
authors.lastname: Zhu
authors.forename: Xiao
authors.initials: X
authors.lastname: Huang
authors.forename: Yu
authors.initials: Y
authors.lastname: Han
authors.forename: Qingxiao
authors.initials: Q
authors.lastname: Wang
authors.forename: Qing
authors.initials: Q
authors.lastname: Liu
authors.forename: Ying
authors.initials: Y
authors.lastname: Huang
authors.forename: Chee Lip
authors.initials: CL
authors.lastname: Gan
authors.forename: Hua
authors.initials: H
authors.lastname: Zhang
keywords: electron microscopy; gold; nanostructures; noble metals; phase transformation