Galvanic replacement of semiconductor phase I CuTCNQ microrods with KAuBr4 to fabricate CuTCNQ/Au nanocomposites with photocatalytic properties.
Galvanic replacement of semiconductor phase I CuTCNQ microrods with KAuBr4 to fabricate CuTCNQ/Au nanocomposites with photocatalytic properties.
复制标题
用 KAuBr4 电取代半导体 I 相 CuTCNQ 微棒，制备具有光催化性能的 CuTCNQ/Au 纳米复合材料。
DOI：
10.1021/ic1021752
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发表时间：
2011
影响因子：
4.6
通讯作者：
S. Bhargava
中科院分区：
文献类型：
--
作者：
A. Pearson;A. O’Mullane;V. Bansal;S. Bhargava
本文报道了I相铜7,7,8,8-四氰喹诺二甲烷（cucnq）半导体微棒与KAuBr(4)在乙腈中的反应。研究发现，该反应本质上是氧化还原反应，并通过电替换机制进行，其中cucnq表面被金属金纳米颗粒取代。考虑到CuTCNQ在乙腈中的溶解度较低，两个相互竞争的反应，即CuTCNQ的溶解和与KAuBr的氧化还原反应(4)，被发现是平行发生的。随着乙腈中KAuBr(4)浓度的增加，cucnq微棒表面的金纳米颗粒覆盖率增加，这也抑制了cucnq的溶解。采用uv -可见、FT-IR、拉曼光谱、XRD、EDX分析、SEM成像等方法监测反应过程随时间的变化。研究了cucnq /Au纳米复合材料的光催化性能，发现模拟太阳光对刚果红（一种有机染料）的破坏依赖于cucnq微棒上金纳米颗粒的表面覆盖。这种修饰CuTCNQ的方法可能会打开用许多其他金属修饰这种和其他金属- tcnq电荷转移配合物的可能性，这些配合物可能具有重要的应用价值。
In this study, the reaction of semiconductor microrods of phase I copper 7,7,8,8-tetracyanoquinodimethane (CuTCNQ) with KAuBr(4) in acetonitrile is reported. It was found that the reaction is redox in nature and proceeds via a galvanic replacement mechanism in which the surface of CuTCNQ is replaced with metallic gold nanoparticles. Given the slight solubility of CuTCNQ in acetonitrile, two competing reactions, namely CuTCNQ dissolution and the redox reaction with KAuBr(4), were found to operate in parallel. An increase in the surface coverage of CuTCNQ microrods with gold nanoparticles occurred with an increased KAuBr(4) concentration in acetonitrile, which also inhibited CuTCNQ dissolution. The reaction progress with time was monitored using UV-visible, FT-IR, and Raman spectroscopy as well as XRD and EDX analysis, and SEM imaging. The CuTCNQ/Au nanocomposites were investigated for their photocatalytic properties, wherein the destruction of Congo red, an organic dye, by simulated solar light was found dependent on the surface coverage of gold nanoparticles on the CuTCNQ microrods. This method of decorating CuTCNQ may open the possibility of modifying this and other metal-TCNQ charge transfer complexes with a host of other metals which may have significant applications.