Dissolving Ag from Au-Ag Alloy Nanoboxes with H(2)O(2): A Method for Both Tailoring the Optical Properties and Measuring the H(2)O(2) Concentration.
Dissolving Ag from Au-Ag Alloy Nanoboxes with H(2)O(2): A Method for Both Tailoring the Optical Properties and Measuring the H(2)O(2) Concentration.
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DOI:
10.1021/jp100354z
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发表时间:
2010-03-05
影响因子:
3.7
通讯作者:
Xia, Younan
中科院分区:
文献类型:
--
作者:
Zhang, Qiang;Cobley, Claire M.;Zeng, Jie;Wen, Long-Ping;Chen, Jingyi;Xia, Younan
This article describes a method for generating Au-based nanocages with controlled wall thickness, porosity, and optical properties by dissolving Ag from Au-Ag alloy nanoboxes with H2O2. It involves two steps: i) formation of Au-Ag alloy nanoboxes with some pure Ag left behind by titrating Ag nanocubes with aqueous HAuCl4; and ii) removal of Ag atoms from both the pure Ag remaining in the nanoboxes and the alloy walls via H2O2 etching. The optical properties of the resultant Au-Ag nanocages can be easily tailored by controlling the amount of H2O2 added into the reaction system. Due to the changes to the optical spectra, the Au-Ag alloy nanoboxes can also be employed to detect H2O2 with a more or less linear readout in the range of concentration from 5×10−2 M down to 5×10−7 M.
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