This work proposes the conventional sonochemical synthesis of nanoparticles of tin (IV) oxide on reduced graphene oxide (rGOS@SnO2) influencing the formation of a composite with enhanced properties. The combination of SnO2 nanoparticles with rGOS weakens the accumulation in layered structures of the latter system, which leads to better exposure of SnO2 active sites and thus increases the conductivity of rGOS@SnO2 composite. This validates the improved electro-catalytic activity of the composite based on previous reports for its successful utilization in the electrochemical determination of toxic contaminants. The quantitative determination of mercury ions, through the use of the electrochemical sensor based on rGOS@SnO2 manifests several advantages such as simple operator, promptness, cost effectiveness and time independency when compared to other traditional techniques. The fabricated sensor displays two wide linear responses in the range of 0.25-705.3 μM for mercury ions, with a rapid response time about 1 s, and with a high sensitivity of 10.18 μA μM-1 cm-2 under optimized conditions. The accumulation of traces of mercury in the bodies of fish in the marine eco system marks the significance of its detection in real samples. The satisfactory results of the proposed sensor establish the supreme efficacy of layered nanomaterials in conjunction with nanoparticles for the simple, rapid and efficient detection of pollutants in food and biological samples.

中文翻译：

---

基于绿色和坚固的合成氧化锡纳米颗粒装饰的还原氧化石墨烯片，高灵敏度测定生物和人类食物样品中的致癌毒性汞离子

这项工作提出了在还原氧化石墨烯 (rGOS@SnO2) 上常规声化学合成氧化锡 (IV) 纳米颗粒，影响具有增强性能的复合材料的形成。SnO2 纳米粒子与 rGOS 的结合减弱了后者系统层状结构中的积累，从而导致 SnO2 活性位点的更好暴露，从而提高了 rGOS@SnO2 复合材料的导电性。这证实了基于先前报告的复合材料在电化学测定有毒污染物中的成功应用，其电催化活性得到改善。使用基于rGOS@SnO2的电化学传感器对汞离子进行定量测定，具有操作简单、迅速、与其他传统技术相比，具有成本效益和时间独立性。制造的传感器对汞离子显示出 0.25-705.3 μM 范围内的两个宽线性响应，响应时间约为 1 s，在优化条件下具有 10.18 μA μM-1 cm-2 的高灵敏度。海洋生态系统中鱼类体内微量汞的积累标志着其在实际样本中检测的意义。所提出的传感器的令人满意的结果确立了层状纳米材料与纳米颗粒相结合的最高功效，用于简单、快速和有效地检测食品和生物样品中的污染物。并在优化条件下具有 10.18 μA μM-1 cm-2 的高灵敏度。海洋生态系统中鱼类体内微量汞的积累标志着其在实际样本中检测的意义。所提出的传感器的令人满意的结果确立了层状纳米材料与纳米颗粒相结合的最高功效，用于简单、快速和有效地检测食品和生物样品中的污染物。并在优化条件下具有 10.18 μA μM-1 cm-2 的高灵敏度。海洋生态系统中鱼类体内微量汞的积累标志着其在实际样本中检测的意义。所提出的传感器的令人满意的结果确立了层状纳米材料与纳米颗粒相结合的最高功效，用于简单、快速和有效地检测食品和生物样品中的污染物。