Enhanced electrochemical detection of heavy metals at heated graphite nanoparticle-based screen-printed electrodes
Enhanced electrochemical detection of heavy metals at heated graphite nanoparticle-based screen-printed electrodes
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DOI：
10.1039/c0jm03751f
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发表时间：
2011-01-01
影响因子：
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通讯作者：
Merkoci, Arben
中科院分区：
文献类型：
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作者：
Aragay, Gemma;Pons, Josefina;Merkoci, Arben
研究了温度对碳纳米颗粒重金属传感器电化学溶出性能的影响。用透射电子显微镜和扫描电子显微镜研究了Cd~(2+)、Pb~(2+)、Cu~(2+)、Hg~(2+)离子多重检测过程中传感表面的形态变化。温度对使用基于碳纳米颗粒的SPE的重金属沉积的影响也与不含碳纳米颗粒的传感器进行了比较。对于基于纳米颗粒的传感器来说，温度的影响似乎更加明显。电化学反应以及所用敏感材料的透射电子显微镜和扫描电子显微镜图像解释了这一现象。此外，还给出了基于纳米颗粒的传感器在具有实际应用潜力的单次和多次检测中对重金属浓度从5-100mgg·L-1(Cd~(2+)、Pb2+和Cu2+)和从1~10mgg·L~(-1)增加到Hg2+的响应性能。这种基于纳米颗粒的传感器在用于海水中重金属的连续监测时，似乎可以稳定长达一个月。
The effect of temperature upon the electrochemical stripping performance of a heavy metal sensor based on carbon nanoparticles is studied. The morphological changes of the sensing surface during the multidetection of Cd2+, Pb2+, Cu2+ and Hg2+ ions are studied by TEM and SEM. The effect of the temperature on the heavy metal deposition using carbon nanoparticle-based SPEs is also compared to a sensor that does not contain carbon nanoparticles. The effect of temperature seems to be more pronounced for the nanoparticle-based sensor. This phenomenon is clarified by the electrochemical response as well as the TEM and SEM images of the sensing materials used. In addition, the response performance of the nanoparticle-based sensors for increasing concentrations of heavy metals from 5-100 mg mu g L-1 for Cd2+, Pb2+ and Cu2+ and from 1 to 10 mu g L-1 for Hg2+, in both single and multiple detections with potential for real applications, is presented. The nanoparticle-based sensor seems to be stable for up to one month while being used in continuous monitoring of heavy metals in seawater.