State Key Laboratory of Analytical Chemistry for Life Science and Collaborative Innovation Center of Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University , Nanjing 210023, China.
Department of Materials Science and Engineering, Stanford University , Stanford, California 94305, United States.
Anal Chem. 2017 Aug 1;89(15):8070-8078. doi: 10.1021/acs.analchem.7b01557. Epub 2017 Jul 19.
This work reports the first preparation and characterization of a hybrid PbS quantum dot (QD)/nanoporous NiO film nanostructure as well as its application for novel self-powered cathodic photoelectrochemical (PEC) sensing. Specifically, we synthesized the thioglycolic acid-capped PbS QDs and then assembled them onto the hydrothermally fabricated three-dimensional (3D) NiO nanostructured films on the transparent indium tin oxide-coated glass substrates, followed by the subsequent conjugation with the glucose oxidase as a model biocatalyst. Favorable alignment existed between the NiO and PbS QDs, and the as-obtained p-type heterostructure was characterized by various techniques and found to have good PEC activities. In the self-powered PEC biosensing of glucose, the system exhibited high sensitivity toward the presence of dissolved oxygen in the electrolyte, and thereby, a novel PEC enzymatic sensor was developed. With a PbS QD/3D NiO nanofilm, this work manifested the great promise of a heterostructure photocathode for a self-powered PEC biosensor that to the best of our knowledge has not been reported. We believe that it could inspire more interest in the design and development of numerous other p-type heterostructures for advanced self-powered PEC biosensors.
这项工作报道了首例 PbS 量子点（QD）/纳米多孔 NiO 薄膜纳米结构的制备和表征，以及其在新型自供电阴极光电化学（PEC）传感中的应用。具体来说，我们合成了巯基乙酸封端的 PbS QD，然后将其组装到在透明氧化铟锡涂覆的玻璃基底上通过水热法制备的三维（3D）NiO 纳米结构薄膜上，随后与葡萄糖氧化酶作为模型生物催化剂进行偶联。NiO 和 PbS QD 之间存在良好的对准，所获得的 p 型异质结通过各种技术进行了表征，并发现其具有良好的 PEC 活性。在葡萄糖的自供电 PEC 生物传感中，该系统对电解质中溶解氧的存在表现出高灵敏度，从而开发了一种新型的 PEC 酶传感器。使用 PbS QD/3D NiO 纳米薄膜，这项工作展示了异质结光阴极在自供电 PEC 生物传感器中的巨大应用潜力，据我们所知，目前尚未有相关报道。我们相信，这将激发更多人对设计和开发用于先进自供电 PEC 生物传感器的其他 p 型异质结的兴趣。
