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One-step large-scale synthesis of micrometer-sized silver nanosheets by a template-free electrochemical method

Sun Hwa Park1, Jin Gyeong Son2, Tae Geol Lee13, Hyun Min Park13 and Jae Yong Song13*

Author Affiliations

1 University of Science and Technology, Daejeon 305-350, Republic of Korea

2 Korea Advanced Institute of Science and Technology, Daejeon 305-701, Republic of Korea

3 Korea Research Institute of Standard and Science, Daejeon 305-340, Republic of Korea

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Nanoscale Research Letters 2013, 8:248  doi:10.1186/1556-276X-8-248

Published: 22 May 2013

Abstract

We have synthesized micrometer-sized Ag nanosheets via a facile, one-step, template-free electrochemical deposition in an ultra-dilute silver nitrate aqueous electrolyte. The nanosheet growth was revealed to occur in three stages: (1) formation of polygonal Ag nuclei on a substrate, (2) growth of {112}-faceted nanowire from the nuclei, and (3) anisotropic growth of (111)-planar nanosheets, approximately 20 to 50 nm in thickness and 10 μm in width, in the <112>−direction. The vertical growth of the facet nanowire was induced by the strong interface anisotropy between the deposit and electrolyte due to the ultra-dilute concentration of electrolyte and high reduction potential. The thickness of Ag nanosheets was controllable by the adjustment of the reduction/oxidation potential and frequency of the reverse-pulse potentiodynamic mode.

Keywords:
Silver; Nanosheets; Template free; Electrochemical deposition