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All-inorganic Perovskite Quantum Dots/TiO2 Inverse Opal Electrode Platform: A Stable and Efficient Photoelectrochemical Sensing for Dopamine under Visible Irradiation

Abstract

CsPbX3 (X = Cl, Br or I) perovskite quantum dots (PQDs) have attracted tremendous attentions due to their extraordinary excellent optical properties. However, it is still an obstacle for bio-application limited by their water-instability. In this work, we designed a novel visible light triggered photoelectrochemical (PEC) sensor based on CsPbBr1.5I1.5 PQDs immobilized three-dimensional (3D) TiO2 inverse opal photonic crystals (IOPCs) for dopamine (DA). Supported by the TiO2 IOPCs, the water-stability of PQDs as well as the PEC sensor was considerably improved. And more, employed as a photoactive material in PEC sensor, CsPbBr1.5I1.5 PQDs can expand the photocurrent response of PEC senor to the whole visible regions. In addition, the modulation of photonic stop band effect of TiO2 IOPCs on the incident light and the emission of PQDs could further enhance the photocurrent response. Such a PEC sensor demonstrates a sensitive detection for DA in phosphate buffer saline solution and serum, with a good linear range from 0.1 μM to 250 μM and a low detection limit of approximate 0.012 μM. Our strategy opens an alternative horizon for PQDs based PEC sensing, which could be more sensitive, convenient and inexpensive for clinical and biological analysis.

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Publication details

The article was received on 14 Mar 2018, accepted on 14 May 2018 and first published on 15 May 2018


Article type: Paper
DOI: 10.1039/C8NR02115E
Citation: Nanoscale, 2018, Accepted Manuscript
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    All-inorganic Perovskite Quantum Dots/TiO2 Inverse Opal Electrode Platform: A Stable and Efficient Photoelectrochemical Sensing for Dopamine under Visible Irradiation

    X. Chen, D. Li, G. Pan, D. Zhou, W. Xu, J. Zhu, H. Wang, C. Chen and H. Song, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C8NR02115E

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