Department of Chemistry, Faculty of Science, Universidad de Burgos, Plaza Misael Bañuelos s/n, 09001 Burgos, Spain.
Department of Chemistry, Faculty of Science, Universidad de Burgos, Plaza Misael Bañuelos s/n, 09001 Burgos, Spain.
Talanta. 2018 May 15;182:549-557. doi: 10.1016/j.talanta.2018.02.005. Epub 2018 Feb 7.
An anodic stripping voltammetric method is reported in this study for the determination of sub-nanomolar Pb concentration using disposable sensors, each consisting of three (counter, working and reference) screen-printed electrodes. Sensor performance was optimized for the determination of Pb through several surface modifications, by using single-walled carbon nanotubes, electro-reduced graphene oxide and gold nanoparticles. A scanning electron microscopy study of the deposition of electrogenerated gold nanoparticles of various sizes on the working electrode surface showed that spherical nanoparticles of around 100 nm provided the best results. The modification of working electrodes with graphene and gold nanoparticles permitted the determination of Pb in seawater (Detection Limit: 3.21·10 M) without modifying the pH of the sample. The electrode systems were printed on both rigid and textile backing materials, to observe the influence of those materials on the final performance of the sensor.
本研究报道了一种使用一次性传感器通过阳极溶出伏安法测定亚纳摩尔级 Pb 浓度的方法，每个传感器由三个（对电极、工作电极和参比电极）丝网印刷电极组成。通过使用单壁碳纳米管、电化学还原氧化石墨烯和金纳米粒子对传感器进行了多种表面修饰，以优化其对 Pb 的测定性能。通过扫描电子显微镜研究了不同尺寸的电生成金纳米粒子在工作电极表面的沉积情况，结果表明，约 100nm 的球形纳米粒子提供了最佳的结果。通过将石墨烯和金纳米粒子修饰工作电极，可以在不调节样品 pH 值的情况下测定海水中的 Pb（检出限：3.21·10 M）。电极系统被打印在刚性和纺织品衬底材料上，以观察这些材料对传感器最终性能的影响。
