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【答案】应助回帖
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Mally89(金币+1): 谢谢交流！~ 2011-05-12 19:11:49
huikityy(金币+20, 翻译EPI+1): 2011-05-12 20:09:16
The electrochemical behaviour of silver nanoparticles in water solution was also analysed. Stripping voltammetry of silver nanoparticles, in dissolution in an electrolyte solution,was carried out using a 25 µmdiameter platinum ultramicroelectrode. To detect silver (I) electrochemically at low concentrations, it is necessary to electrodeposit silver onto the electrode surface in a pre-concentration step by holding the potential of the electrode at −0.3Vversus for 60 s [18]. This procedure reduces Ag+ to Ag0,which plates onto the electrode surface. When the potential is swept positively from −0.3to+0.35 V, the deposited silver is oxidized to Ag+ and stripped from the electrode, giving a characteristic stripping peak with a
height proportional to the concentration of Ag+ in the solution.
我们对银纳米颗粒在水溶液中的电化学行为也进行了分析。溶出电极测试使用直径为25mm的铂超微电极，纳米粒子溶解在电解质溶液中。为检测低浓度Ag+的电化学性质，需要将电极电势为-0.3VAg/AgCl 预浓缩60S[18]，使电极表面镀上一层银。于是银离子从+1价还原为0价的银单质，富集在电极表面。 当电势差变化范围-0.3v至+0.35v时，富集在电极上的的银单质又被氧化为Ag+进入溶液，由此给出溶液中峰高与Ag+浓度成比例的特征峰。 |
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