Zhang Ruilong, Zheng Delun, Chen Jianqiao, Zhang Caiyun, Wang Chengwen
Department of Natural Sciences, Shantou Polytechnic, Shantou, Guangdong 515078, PR China.
Department of Natural Sciences, Shantou Polytechnic, Shantou, Guangdong 515078, PR China.
Food Chem. 2023 Aug 30;418:136028. doi: 10.1016/j.foodchem.2023.136028. Epub 2023 Mar 24.
Owing to their internal electric field effect and abundant photo-induced carriers, photoactive heterostructured materials are considered a feasible approach to improve the sensitivity of a photoelectrochemical (PEC) sensor. Herein, a novel NiS@NiS/CdS heterostructure composite is derived from Ni-loaded zeolitic imidazolate framework (Ni-ZIF). The PEC experiments showed the NiS@NiS/CdS composite exhibits superior photocurrent response than NiS@NiS and CdS. This is attributed to the fact that the type II heterojunction of NiS@NiS/CdS with a tightly connected interface reduces the transport distance of carriers and facilitates electron-hole separation. Next, using the NiS@NiS/CdS modified electrode, an aptamer/glutaraldehyde/chitosan/NiS@NiS/CdS/ITO PEC biosensor is developed, which exhibits excellent sensitivity for lincomycin (Lin) detection with a wide linear range (0.0001 ∼ 1.25 nM) and a low detection limit of 0.067 pM. The prepared sensor is further employed to monitor Lin in the actual milk. The results confirm that the prepared sensing electrode displays good selectivity, repeatability and stability.
由于其内部电场效应和丰富的光生载流子，光活性异质结构材料被认为是提高光电化学（PEC）传感器灵敏度的一种可行方法。在此，一种新型的NiS@NiS/CdS异质结构复合材料由负载镍的沸石咪唑酯骨架（Ni-ZIF）衍生而来。PEC实验表明，NiS@NiS/CdS复合材料比NiS@NiS和CdS表现出更优异的光电流响应。这归因于NiS@NiS/CdS具有紧密连接界面的II型异质结减少了载流子的传输距离并促进了电子-空穴分离。接下来，使用NiS@NiS/CdS修饰电极，开发了一种适体/戊二醛/壳聚糖/NiS@NiS/CdS/ITO PEC生物传感器，该传感器对林可霉素（Lin）检测具有优异的灵敏度，线性范围宽（0.0001 ∼ 1.25 nM），检测限低至0.067 pM。所制备的传感器进一步用于监测实际牛奶中的林可霉素。结果证实，所制备的传感电极具有良好的选择性、重复性和稳定性。
