Journal
MATERIALS LETTERS
Volume 65, Issue 15-16, Pages 2326-2329Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.matlet.2011.05.036
Keywords
Nanocrystalline materials; Metals and alloys; Dendritic gold; Porous films; Gold nanoparticles; Oxidation-reduction cycles
Funding
- NSF of Zhejiang Province of China [Y4090658]
- Open Foundation of Key Laboratory of the Education Ministry of China for Advanced Catalysis Materials [DH201001]
- Ph. D. Programs Foundation of the Education Ministry of China [20104306110003]
- NNSF of China [20673103, 21003045]
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Dendritic gold was facilely fabricated here via a simple two-step method by treating a pure gold electrode sequentially in two blank solutions for very short periods of time. The electrode surface was firstly roughened in 2 M HCl by a step potential for 50s to form a three-dimensional (3D) nanoporous film consisting of randomly aggregated gold nanoparticles, and was then treated with square wave potential pulses for 500 s in 2 M H(2)SO(4) to fulfill the transformation of the aggregated nanoparticles into dendritic structures. The influence of potential range, square wave frequency, electrolyte, and potential waves on the dendrite formation was investigated. A one-step method was also explored for mechanism comparison by treating the polished gold instead in the presence or absence of HAuCl(4). (C) 2011 Elsevier B.V. All rights reserved.
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