Various pesticides employed in modern agriculture result in large amounts of pesticide residues in agricultural production, greatly threatening human health. Herein, we report a facile approach to fabricate a reduced graphene oxide/cyclodextrin modified glassy carbon electrode (rGO/CD/GCE) for the sensitive electrochemical sensing of imidacloprid (IDP). Three different modified electrodes using CDs (α-, β-, γ-CD) were fabricated, and their electrochemical performance was further studied. The results demonstrate that α-CD possesses the best signal amplification for IDP. Compared with wet-chemical synthesis of rGO/CDs (W-rGO/CDs), the electrochemical synthesis of rGO/CDs (E-rGO/CDs) produced sensors that showed better performance for IDP sensing. Taking advantage of prepared E-rGO/α-CD nanocomposite, the fabricated sensor offered a low detection limit (0.02 μM) with a wider linear range (0.5–40 μM) and long-term stability. The new sensor was successfully applied for the detection of IDP in brown rice, providing a new technique for efficient and convenient monitoring of pesticide residues in food.

现代农业中使用的各种农药会在农业生产中产生大量农药残留，极大地威胁着人类健康。在这里，我们报告了一种简便的方法来制造还原的氧化石墨烯/环糊精修饰的玻碳电极（rGO / CD / GCE），用于吡虫啉（IDP）的灵敏电化学感应。制备了三种不同的使用CDs的修饰电极（α-，β-，γ -CD），并对其电化学性能进行了进一步研究。结果表明，α-CD具有IDP最佳的信号放大能力。与rGO / CD的湿化学合成（W-rGO / CDs）相比，rGO / CD的电化学合成（E-rGO / CDs）产生的传感器表现出更好的IDP感测性能。利用制备的E-rGO / α -CD纳米复合材料，所制造的传感器具有较低的检测限（0.02μM），较宽的线性范围（0.5–40μM）和长期稳定性。该新型传感器已成功应用于糙米中IDP的检测，为高效，便捷地监测食品中农药残留提供了新技术。