Naveen Bommireddy, Lee Sang-Wha
Department of Chemical and Biological Engineering, Gachon University, 1342 Seongnam-daero, Seongnam-si 13120, Gyeonggi-do, Republic of Korea.
Molecules. 2024 Sep 26;29(19):4571. doi: 10.3390/molecules29194571.
In this study, we demonstrate the electrodeposition of copper nanoparticles (NPs) on pencil graphite electrodes (PGEs) utilizing sodium dodecyl sulphate (SDS) as a soft template. The utilization of the surfactant had an impact on both the physical arrangement and electrochemical characteristics of the modified electrodes. The prepared Cu-SDS/PGE electrodes had hierarchical dendritic structures of copper NPs, thereby increasing the surface area and electrochemical catalytic activity in comparison with Cu/PGE electrodes. The Cu-SDS/PGE electrode showed excellent catalytic activity in reducing hydrogen peroxide, resulting in the sensitive and selective detection of hydrogen peroxide. The electrode exhibited a good sensitivity of 21.42 µA/µM/cm, a lower limit of detection 0.35, and a response time of less than 2 s over a wide range spanning 1 µM to 1 mM of hydrogen peroxide concentrations. The electrodes were also highly selective for HO with minimal interference from other analytes even at concentrations higher than that of HO. The approach offers the benefit of electrode preparation in just 5 min, followed by analysis in 10 min, and enables for the quantitative determination of hydrogen peroxide within 30 min. This can be achieved utilizing a newly prepared, cost-effective electrode without the need for complex procedures.
在本研究中，我们展示了利用十二烷基硫酸钠（SDS）作为软模板在铅笔石墨电极（PGEs）上电沉积铜纳米颗粒（NPs）。表面活性剂的使用对修饰电极的物理排列和电化学特性均有影响。制备的Cu-SDS/PGE电极具有铜纳米颗粒的分级树枝状结构，因此与Cu/PGE电极相比，其表面积和电化学催化活性有所增加。Cu-SDS/PGE电极在还原过氧化氢方面表现出优异的催化活性，从而实现了对过氧化氢的灵敏且选择性检测。该电极在1 μM至1 mM的过氧化氢浓度范围内具有21.42 μA/μM/cm的良好灵敏度、0.35的较低检测限以及小于2 s的响应时间。即使在高于过氧化氢浓度的情况下，该电极对过氧化氢也具有高度选择性，受其他分析物的干扰极小。该方法具有在5分钟内制备电极、随后在10分钟内进行分析的优点，并能够在30分钟内对过氧化氢进行定量测定。这可以通过使用新制备的、具有成本效益的电极来实现，而无需复杂的程序。
