Issue 36, 2015

Formation of Rh frame nanorods using Au nanorods as sacrificial templates

Abstract

This report describes a new formation process of Rh frame structures using Au nanorods (NRs) as sacrificial templates. Initially, Au@Rh NRs were prepared by reducing Rh3+ in the presence of Au NRs, ascorbic acid, and cetyl trimethyl ammonium bromide (CTAB) in aqueous solution. After formation of Au@Rh NRs having an island-type of Rh shell, Rh NR frames, which consist of four side edges and top and bottom edges of NRs, were formed in one step through selective oxidative etching of an Au NR core and Rh shells over unstable facets such as {2 5 0} or {5 12 0} by X (X = Br, Cl) + O2. An alternative method for the formation of Rh NR frames was the separation between the formation process of Au@Rh NRs and Rh NR frames by oxidative etching. In this two-step process, after formation of Au@Rh NRs, a similar shape of Rh NR frames having {100} facets as major planes was prepared by the addition of HCl. No Rh frame structure was formed from decahedral Au@Rh particles because smooth Rh shells without interspace were formed; Rh shells over low-index {111} facets were not etched by X (X = Br, Cl) + O2. The results obtained from this study suggest a novel method for the formation of frame structures and constitute new information related to their formation mechanism.

Graphical abstract: Formation of Rh frame nanorods using Au nanorods as sacrificial templates

Supplementary files

Article information

Article type
Paper
Submitted
18 feb 2015
Accepted
14 maj 2015
First published
14 maj 2015

CrystEngComm, 2015,17, 6955-6961

Author version available

Formation of Rh frame nanorods using Au nanorods as sacrificial templates

M. Tsuji, Y. Nakashima, A. Yajima and M. Hattori, CrystEngComm, 2015, 17, 6955 DOI: 10.1039/C5CE00357A

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