期刊
ANALYTICAL CHEMISTRY
卷 87, 期 13, 页码 6703-6708出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.analchem.5b00844
关键词
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资金
- National Key Basic Research Program of China [2013CB934104]
- Natural Science Foundation of China [21322311, 21473038]
- Science and Technology Commission of Shanghai Municipality [14JC1490500]
- Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning
- Collaborative Innovation Center of Chemistry for Energy Materials [2011-iChem]
- Hui-Chun Chin and Tsung-Dao Lee Chinese Undergraduate Research Endowment
- Wang-Dao Undergraduate Research Funding
- Student's Academic Science and Technology Innovation Action Support Program of Fudan University
- Deanship of Scientific Research at King Saud University (RG) [1435-010]
A three-dimensional (3D) mesoporous Fe2O3-CdS nanopyramid heterostructure is developed for solar-driven, real-time, and selective photoelectrochemical sensing of Cu2+ in the living cells. Fabrication of the mesoporous Fe2O3 nanopyramids is realized by an interfacial aligned growth and self-assembly process, based on the van der drift model and subsequent selective in situ growth of CdS nanocrystals. The as-prepared mesoporous Fe2O3-CdS heterostructures achieve significant enhancement (similar to 3-fold) in the photocurrent density compared to pristine mesoporous Fe2O3, which is attributed to the unique mesoporous heterostructures with multiple features including excellent flexibility, high surface area (similar to 87 m(2)/g), and large pore size (similar to 20 nm), enabling the PEC performance enhancement by facilitating ion transport and providing more active electrochemical reaction sites. In addition, the introduction of Cu2+ enables the activation of quenching the charge transfer efficiency, thus leading to sensitive photoelectrochemical recording of Cu2+ level in buffer and cellular environments. Furthermore, real-time monitoring (similar to 0.5 nM) of Cu2+ released from apoptotic HeLa cell is performed using the as-prepared 3D mesoporous Fe2O3 CdS sensor, suggesting the capability of studying the nanomaterial cell interfaces and illuminating the role of Cu2+ as trace element.
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