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
Xia, Younan
中科院分区:
化学3区
文献类型:
--
作者:
Zhang, Qiang;Cobley, Claire M.;Zeng, Jie;Wen, Long-Ping;Chen, Jingyi;Xia, Younan

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本文描述了一种用过氧化氢溶解Au-Ag合金纳米盒中的银来制备具有可控壁厚、孔隙率和光学性质的Au基纳米笼的方法。它包括两个步骤:i)用HAuCl4溶液滴定Ag纳米立方体,形成含少量纯Ag的Au-Ag合金纳米盒;ii)通过H_2O_2刻蚀去除残留在纳米盒中的纯Ag和合金壁上的Ag原子。通过控制反应体系中加入的过氧化氢的量,可以很容易地调整所得到的Au-Ag纳米笼的光学性质。由于光谱的变化,Au-Ag合金纳米盒也可以用来检测过氧化氢,在5×10−2 M到5×10−7 M的浓度范围内有或多或少的线性读数。
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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发表时间: 2003-11-01
期刊: NANO LETTERS
影响因子: 10.8
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