| 松树枝状双金属Ag-Cu颗粒的制备与电活性 |
| Fabrication and Electroactivity of Pine Branch-Like Binary Ag-Cu Nanoparticles |
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| 摘要: 利用恒电位电解技术，直接从无支持电解质的AgNO3和Cu(NO3)2混合溶液中，在钛片表面上沉积具有松树枝状结构的双金属Ag-Cu纳米颗粒。SEM图像表明，树枝长度随铜比例的增加而增加；随着电解的不断进行，双金属纳米颗粒直接沉积于树叶顶端，形成花蕊芯状结构。松树枝状结构的形成是Ag+和Cu2+的扩散过程与电迁移过程共同作用的结果。研究了肼在这种双金属Ag-Cu纳米颗粒上的循环伏安特性，结果表明，肼在这种以钛为基体的树枝状双金属Ag79Cu21，Ag71Cu29和Ag54Cu46纳米电极表面上的吸附为多层吸附，由此建立超低浓度肼的电化学检测法，在1 mol·L-1 NaOH溶液中的检测下限分别为0.094 1、0.036 9和0.264 μmol·L-1。 |
| 关键词: 松树枝状纳米颗粒 双金属Ag-Cu 肼检测 电沉积 |
| 基金项目: |
| Abstract: From the mixture of AgNO3 and Cu(NO3)2 without supporting electrolyte, pine branch-like binary Ag-Cu nanoparticles were deposited on the Ti surface using simple chronoamperometric technique. Their SEM images show that the length of pine branches increases with electro-deposition time and copper content in the mixture of AgNO3 and Cu(NO3)2. It was also observed that the increase of electro-deposition time resulted in the deposition of binary Ag-Cu nanoparticles on the top of pine leaves to form a pistil-like texture. The possible formation mechanism of the pine branch-like structure was related to both electro-migration and diffusion processes of metal ions (Ag+ + Cu2+). Therefore, it was possible to control both the length of branches and pine leaves by choosing appropriate compositions of the Ag+ to Cu2+ and electrodeposition time. A multi-layer adsorption mechanism of hydrazine on these Ti-supported binary Ag-Cu electrocatalysts was proposed according to the cyclic voltammograms in alkaline solutions. An electrochemical detection of ultra-low concentration of hydrazine was founded on the basis of cyclic voltammetric measurements. The detection limits of hydrazine in 1 mol·L-1 NaOH at Ag79Cu21, Ag71Cu29 and Ag54Cu46 were 0.094 1, 0.036 9 and 0.264 μmol·L-1 respectively. The prepared pine branch-like binary Ag-Cu nanoparticles presented high stability on the Ti substrate in alkaline solutions. |
| Keywords: pine branch-like nanoparticles binary Ag-Cu hydrazine detection electrodeposition |
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| 易清风,李 磊,宋李红,牛凤娟.松树枝状双金属Ag-Cu颗粒的制备与电活性[J].无机化学学报,2010,26(9):1600-1604. |
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