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'Sticky electrodes' for the detection of silver nanoparticles

机译：用于检测纳米银颗粒的“粘性电极”

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摘要

Detection and quantification of nanoparticles in environmental systems is a task that requires reliable and affordable analytical methods. Here an approach using a cysteine-modified 'sticky' glassy carbon electrode is presented. The electrode is immersed in a silver nanoparticle containing electrolyte and left in this suspension without an applied potential, i.e. under open circuit condition, for a variable amount of time. The amount of silver nanoparticles immobilized on the electrode within this sticking time is then determined by oxidative stripping, yielding the anodic charge and thus the amount of Ag nanoparticles sticking to the electrode surface. When using a cysteine-modified glassy carbon electrode, significant and reproducible amounts of silver nanoparticles stick to the surface, which is not the case for unmodified glassy carbon surfaces. Additionally, proof-of-concept experiments are performed on real seawater samples. These demonstrate that also under simulated environmental conditions an increased immobilization and hence improved detection of silver nanoparticles on cysteine-modified glassy carbon electrodes is achieved, while no inhibitive interference with this complex matrix is observed.
机译：环境系统中纳米颗粒的检测和定量是一项需要可靠且负担得起的分析方法的任务。这里提出了一种使用半胱氨酸修饰的“粘性”玻璃碳电极的方法。将该电极浸入含有电解质的银纳米颗粒中，并在无施加电势的情况下（即在开路条件下）将该可变的时间留在该悬浮液中。然后通过氧化剥离，确定在此粘附时间内固定在电极上的银纳米颗粒的量，产生阳极电荷，从而粘附在电极表面的Ag纳米颗粒的量。当使用半胱氨酸修饰的玻碳电极时，大量且可重现的银纳米颗粒会粘附在表面上，而未修饰的玻碳表面则并非如此。此外，对真实的海水样本进行了概念验证实验。这些证明了在模拟环境条件下，在半胱氨酸修饰的玻碳电极上也实现了固定化的提高，从而提高了对银纳米颗粒的检测，同时未观察到对该复合基质的抑制性干扰。

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