Mesoporous Fe2O3鈥揅dS Heterostructures for Real-Time Photoelectrochemical Dynamic Probing of Cu2+

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• 作者：Jing Tang ; Jun Li ; Yueyu Zhang ; Biao Kong ; Yiliguma ; Yang Wang ; Yingzhou Quan ; Hao Cheng ; Abdullah M. Al-Enizi ; Xingao Gong ; Gengfeng Zheng
• 刊名：Analytical Chemistry
• 出版年：2015
• 出版时间：July 7, 2015
• 年：2015
• 卷：87
• 期：13
• 页码：6703-6708
• 全文大小：440K
• ISSN：1520-6882

文摘

A three-dimensional (3D) mesoporous Fe₂O₃鈥揅dS 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鈥揅dS heterostructures achieve significant enhancement (鈭?-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 (鈭?7 m²/g), and large pore size (鈭?0 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 (鈭?.5 nM) of Cu²⁺ released from apoptotic HeLa cell is performed using the as-prepared 3D mesoporous Fe₂O₃鈥揅dS sensor, suggesting the capability of studying the nanomaterial鈥揷ell interfaces and illuminating the role of Cu²⁺ as trace element.