title: Mesoporous Fe2O3-CdS Heterostructures for Real-Time Photoelectrochemical Dynamic Probing of Cu(2+).
abstract: A three-dimensional (3D) mesoporous Fe2O3-CdS nanopyramid heterostructure is developed for solar-driven, real-time, and selective photoelectrochemical sensing of Cu(2+) 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 (∼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 (∼87 m(2)/g), and large pore size (∼20 nm), enabling the PEC performance enhancement by facilitating ion transport and providing more active electrochemical reaction sites. In addition, the introduction of Cu(2+) enables the activation of quenching the charge transfer efficiency, thus leading to sensitive photoelectrochemical recording of Cu(2+) level in buffer and cellular environments. Furthermore, real-time monitoring (∼0.5 nM) of Cu(2+) 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 Cu(2+) as trace element.
authors.affiliation: †Laboratory of Advanced Materials, Department of Chemistry, Collaborative Innovation Center of Chemistry for Energy Materials, Fudan University, Shanghai 200433, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Tang
authors.affiliation: †Laboratory of Advanced Materials, Department of Chemistry, Collaborative Innovation Center of Chemistry for Energy Materials, Fudan University, Shanghai 200433, China.
authors.forename: Jun
authors.initials: J
authors.lastname: Li
authors.affiliation: ‡Center for Key Laboratory of Computational Physical Sciences, Ministry of Education, State Key Laboratory of Surface Physics, and Department of Physics, Fudan University, Shanghai 200433, China.
authors.forename: Yueyu
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: †Laboratory of Advanced Materials, Department of Chemistry, Collaborative Innovation Center of Chemistry for Energy Materials, Fudan University, Shanghai 200433, China.
authors.forename: Biao
authors.initials: B
authors.lastname: Kong
authors.affiliation: †Laboratory of Advanced Materials, Department of Chemistry, Collaborative Innovation Center of Chemistry for Energy Materials, Fudan University, Shanghai 200433, China.
authors.lastname: Yiliguma
authors.affiliation: †Laboratory of Advanced Materials, Department of Chemistry, Collaborative Innovation Center of Chemistry for Energy Materials, Fudan University, Shanghai 200433, China.
authors.forename: Yang
authors.initials: Y
authors.lastname: Wang
authors.affiliation: †Laboratory of Advanced Materials, Department of Chemistry, Collaborative Innovation Center of Chemistry for Energy Materials, Fudan University, Shanghai 200433, China.
authors.forename: Yingzhou
authors.initials: Y
authors.lastname: Quan
authors.affiliation: †Laboratory of Advanced Materials, Department of Chemistry, Collaborative Innovation Center of Chemistry for Energy Materials, Fudan University, Shanghai 200433, China.
authors.forename: Hao
authors.initials: H
authors.lastname: Cheng
authors.affiliation: §Department of Chemistry-College of Science, King Saud University, Riyadh 11451, Saudi Arabia.
authors.forename: Abdullah M
authors.initials: AM
authors.lastname: Al-Enizi
authors.affiliation: ‡Center for Key Laboratory of Computational Physical Sciences, Ministry of Education, State Key Laboratory of Surface Physics, and Department of Physics, Fudan University, Shanghai 200433, China.
authors.forename: Xingao
authors.initials: X
authors.lastname: Gong
authors.affiliation: †Laboratory of Advanced Materials, Department of Chemistry, Collaborative Innovation Center of Chemistry for Energy Materials, Fudan University, Shanghai 200433, China.
authors.forename: Gengfeng
authors.initials: G
authors.lastname: Zheng
mesh_terms: D019187:Cadmium Compounds / Q000737:chemistry*; D003300:Copper / Q000737:chemistry*; D005290:Ferric Compounds / Q000737:chemistry*; D015335:Molecular Probes; D013440:Sulfides / Q000737:chemistry*
chemical_list: D019187:Cadmium Compounds; D005290:Ferric Compounds; D015335:Molecular Probes; D013440:Sulfides; C034939:cadmium sulfide; C000499:ferric oxide; D003300:Copper