期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 304, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2019.127389
关键词
CeO2@MnO2 core-shell hollow nanosphere; Glucose oxidase (GOx)-like photoenzyme property; Non-Enzymatic PEC sensor; Glucose
资金
- National Natural Science Foundation of China [21874042, 21977028]
Nanomaterial-based photoenzyme with bifunction is considered as promising mimetic enzyme in mimicking physiological processes. However, the synthesized design of the enzyme is still a significant challenge. Herein,CeO2@MnO2 core-shell hollow nanosphere was firstly fabricated by in situ growth of MnO2 nanolayer on the hollow CeO2 nanosphere. The prepared heterojunction exhibited excellent photoelectrochemical (PEC) performance because their two-phase interface could facilitate electron transfer under illumination. Meanwhile, the heterojunction had glucose oxidase (GOx)-like photoenzyme property and could catalyze the oxidation of glucose in O-2-saturated PBS (pH 7.0) buffer solution at the bias potential of 0.50 V under visible-light irradiation. The result resulted in the decrease of the photocurrent of CeO2@MnO2 heterojunction/FTO electrode. Therefore, a novel non-enzymatic PEC sensor was constructed to detect glucose based on the PEC performance and GOx-like photoenzyme property of CeO2@MnO2 heterojunction under visible-light irradiation. Under the optimized conditions, the detection limit was down to 0.07 mu M. Meanwhile, the proposed PEC sensor possessed acceptable selectivity, reproducibility and stability. Moreover, the non-enzymatic biosensor was successfully applied to detect glucose levels in human serum samples.
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