In this study, lead(II) sulfide (PbS) nanocrystals were modified on nickel(II)oxide nanosheets (NiO NSs) via the chemical bath method. Afterwards, Au nanoparticles (NPs) were also modified successfully. A photoelectrochemical (PEC) self-powered platform for detecting sarcosine with high PEC activity was constructed. The capacity of NiO NSs to be loaded with other sensitizing materials was mainly attributed to its porous structure and large specific surface area. Under optimum conditions, the constructed PEC self-powered cathodic sensor for detecting sarcosine exhibited a linear range in 5.0 × 10^-8−5.0 × 10^-2 mol/L with a detection limit (LOD) of 1.7 × 10^-8 mol/L. The biosensor demonstrated good reproducibility, acceptable stability and high specificity, thus confirming its potential application in the detection of other similar substances.

在这项研究中，通过化学浴法在氧化镍 (II) 纳米片 (NiO NSs) 上修饰了硫化铅 (PbS) 纳米晶体。之后，金纳米粒子（NPs）也被成功修饰。构建了用于检测具有高PEC活性的肌氨酸的光电化学（PEC）自供电平台。NiO NSs 负载其他敏化材料的能力主要归功于其多孔结构和大比表面积。在最佳条件下，构建的用于检测肌氨酸的PEC自供电阴极传感器的线性范围为5.0×10 ^-8 -5.0×10 ^-2  mol/L，检测限（LOD）为1.7×10 ^-8 摩尔/升。该生物传感器表现出良好的重现性、可接受的稳定性和高特异性，从而证实了其在其他类似物质检测中的潜在应用。