A facile molecularly imprinted electrochemical sensor based on graphene: application to the selective determination of thiamethoxam in grain
A facile molecularly imprinted electrochemical sensor based on graphene: application to the selective determination of thiamethoxam in grain
复制标题
一种基于石墨烯的简便分子印迹电化学传感器：应用于选择性测定谷物中的噻虫嗪
DOI：
10.1039/c7ra05167k
复制
发表时间：
2017
期刊：
影响因子：
3.9
通讯作者：
Haitian Zhao
中科院分区：
文献类型：
--
作者：
Lei Yao;Haitian Zhao
在这项研究中，我们报道了一种简便的制备分子印迹聚合物石墨烯的方法，用于电化学检测甲氧西林残留量。我们选择对乙烯基苯甲酸作为功能单体，它可以通过π-π相互作用在石墨烯表面一步增加识别单元和烯基单元，有效地简化了反应过程。通过减少涉及烯基改性剂的加成步骤形成超薄印迹膜(2 Nm)。由于甲氧西林的不可逆电还原特性，利用循环伏安扫描可以很容易地去除模板，而不需要有机溶剂。对该传感器的性能进行了评价，结果表明该传感器对甲氧西林的检测具有良好的特异性识别能力，印迹因子为2.36。在0.5~2 0μM范围内，甲氧西林的峰电流与其浓度呈线性关系，检出限为0.0 4μM。该传感器还实现了对实际样品中甲氧西林的选择性检测。
In this study, we report a facile method for the preparation of molecularly imprinted polymer based graphene for the electrochemical detection of thiamethoxam residue. We choose p-vinylbenzoic acid as a functional monomer; it can be used to add recognition units and alkenyl units onto the surface of graphene via π–π interactions in just one step, effectively simplifying the reaction process. And an ultra-thin imprinting film (2 nm) is formed by reducing the addition step involving the alkenyl modifier. Due to the irreversible electrochemical reduction characteristics of thiamethoxam, the template can be removed easily using cyclic voltammetry scanning, without the need for organic solvents. The performance of the fabricated sensor was evaluated and the results indicated that the sensor exhibited excellent specific recognition abilities for thiamethoxam detection; the imprinting factor is 2.36. The peak current from thiamethoxam is linearly proportional to its concentration over the range from 0.5 to 20 μM, and the detection limit is 0.04 μM. The practical application of the sensor was also realized in the selective detection of thiamethoxam in real samples.