期刊
NANO LETTERS
卷 21, 期 4, 页码 1879-1887出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.1c00076
关键词
photoelectrochemical sensors; single atoms; cadmium sulfide; photoanode; enzyme-linked immunosorbent assay
类别
资金
- National Natural Science Foundation of China [22074049, 22004042]
- Natural Science Foundation of Hubei Province [2020CFB276]
- self-determined research funds of CCNU from the colleges' basic research and operation of MOE [CCNU20QN007, CCNU20TS013]
- Program of Introducing Talents of Discipline to Universities of China (111 program) [B17019]
Single-atom catalysts, especially platinum single atoms (Pt SAs), show great potential in catalyst design, with Pt SAs supported by nanomaterials demonstrating superior performance, particularly in photoelectrochemical biosensing, enhancing detection sensitivity for specific analytes.
Benefiting from the maximum atom-utilization efficiency and distinct structural features, single-atom catalysts open a new avenue for the design of more functional catalysts, whereas their bioapplications are still in their infancy. Due to the advantages, platinum single atoms supported by cadmium sulfide nanorods (Pt SAs-CdS) are synthesized to build an ultrasensitive photoelectrochemical (PEC) biosensing platform. With the decoration of Pt SAs, the PEC signal of CdS is significantly boosted. Furthermore, theory calculations indicate the positively charged Pt SAs could change the charge distribution and increase the excited carrier density of CdS. Meanwhile, it also suggests that Cu2+ can severely hinder the photoexcitation and electron-hole separation of CdS. As a proof of concept, prostate-specific antigen is chosen as the target analyte to demonstrate the superiority of the Pt SAs-CdS-based PEC sensing system. As a result, the PEC biosensor based on Pt SAs-CdS exhibits outstanding detection sensitivity and promising applicability.
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