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Construction of dentate bonded TiO2-CdSe heterostructures with enhanced photoelectrochemical properties: versatile labels toward photoelectrochemical and electrochemical sensing.

Dalton transactions (Cambridge, England : 2003) (2014-11-20)
Picheng Gao, Hongmin Ma, Tao Yan, Dan Wu, Xiang Ren, Jiaojiao Yang, Bin Du, Qin Wei
ABSTRACT

A facile synthetic route for TiO2-CdSe heterostructures was proposed based on dentate binding of TiO2 to carboxyl. Carboxyl functionalized CdSe quantum dots (CF-CdSe QDs) were successfully bonded onto TiO2 nanoparticles (NPs), which could significantly improve the photoelectrochemical (PEC) properties of TiO2 NPs. This is ascribed to the fact that CdSe QDs with a narrow band gap could be stimulated under visible light irradiation, and the energy levels of TiO2 NPs and CF-CdSe QDs are aligned with an electrolyte solution. High resolution transmission electron microscopy images revealed the heterostructures of the TiO2-CdSe composites. Ultraviolet visible spectroscopy, photoluminescence emission spectroscopy and electrochemical impedance spectroscopy analysis exhibited that the prepared TiO2-CdSe heterostructures have improved light absorption, charge separation efficiency and electron transfer ability in the visible light region. TiO2-CdSe heterostructures were used as versatile labels for fabrication of PEC and electrochemical immunosensors, and human immune globulin G (HIgG) was used as a model analyte. The immunosensor showed high sensitivity, a low detection limit and a wide linear range, which could be applied in practical serum sample analysis. The constructed TiO2-CdSe heterostructures would have potential applications in photocatalysis, aptasensors, cytosensors and other areas of nanotechnology.

MATERIALS
Product Number
Brand
Product Description

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(3-Aminopropyl)triethoxysilane, 99%
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N-Hydroxysuccinimide, 98%
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1,2-Dichloroethane, anhydrous, 99.8%
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Titanium(IV) butoxide, reagent grade, 97%
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(3-Aminopropyl)triethoxysilane, ≥98%
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Selenium, powder, −100 mesh, 99.99% trace metals basis
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1,2-Dichloroethane, ACS reagent, ≥99.0%
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Sodium sulfite, ACS reagent, ≥98.0%
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Sodium sulfite, BioXtra, ≥98%
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1,2-Dichloroethane, suitable for HPLC, ≥99.8%
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N-Hydroxysuccinimide, purum, ≥97.0% (T)
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Sodium sulfite, puriss. p.a., reag. Ph. Eur., anhydrous, 98-100.0% (iodometric)
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