期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 288, 期 -, 页码 641-648出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2019.03.054
关键词
alpha-MoO3; Hierarchical porous structure; Graphene oxide; Electrochemical sensor; Hydrogen peroxide
资金
- National Natural Science Foundation of China [51302067]
- Interational Science & Technology Cooperation Program of China [2016YFE0115100]
- Scientific and Technological Innovation Talents of Harbin [2016RAQXJ005]
- Young Innovation Talents of college in Heilongjiang Province [UNPYSCT-2016074]
- Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, Heilongjiang University
The nonenzymatic electrochemical H2O2 sensor based on molybdenum oxides has been rarely reported. In this work, a nonenzymatic electrode, hierarchical porous alpha-MoO3 and graphene oxide decorated glass carbon electrode (alpha-MoO3/GO/GCE) used for H2O2 electrochemical detection, is firstly fabricated by simple layer-by-layer assemble method, in which the alpha-MoO3 is derived by one-step pyrolysis of the regular organic-inorganic hybrid [(H2L)(2)(Mo8O26)](n) [HL = N-(pyridin-3-ylmethyl)pyridine-3-amine] single crystal precursor. The wedge-shaped morphology of the material is accumulated by micro-slices which comprise of nanosheets and small particles with average size of 25 nm. Meanwhile, different types of meso-and macro-pores with the size distributions of 4-6, 20-35 and 100-150 nm are observed, respectively. The alpha-MoO3/GO/GCE sensor based on the optimal ratio of 1:1 shows excellent electrocatalytic H2O2 property at room temperature. It displays the broad linear detection from 0.92 mu M to 2.46 mM and the high sensitivity is calculated to be 391.39 mu A mM(-1) cm(-2) with a low detection limit of 0.31 mu M (S/N = 3). The sensor can achieve 95% steady state current within 5 s and present well stability, reproducibility and anti-interference during H2O2 detection. Furthermore, the sensor is applied for the determination of H2O2 in human serum samples. The excellent performances of this sensor are related to the hierarchical porous structure of alpha-MoO3 and its synergistic effect with GO.
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