Journal
JOURNAL OF INORGANIC MATERIALS
Volume 35, Issue 10, Pages 1169-+Publisher
SCIENCE PRESS
DOI: 10.15541/jim20200005
Keywords
Pt-Au dendritic nanostructure; oxidase-like activity; colorimetric method; ascorbic acid
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Funding
- National Key Research and Development Project [2017YFB0310600]
- Shanghai International Science and Technology Cooperation Fund [17520711700, 18520744200]
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Due to high stability and sensitivity, inorganic nanomaterials with enzyme-like activity have brilliant application prospects. Tuning the enzyme-like activity plays great significance for promoting the development of nanozymes. In this work, Pt-Au dendritic nanoparticles (Pt-Au DNPs) with good uniformity and stability were synthe-sized by a simple liquid phase reduction method, and used to colorimetrically detect ascorbic acid (AA) by using their oxidase-like activity to catalyze the oxidation of TMB (3,3',5,5'-tetramethylbenzidine). The oxidase-like activity was found to be highly influenced by the composition and structure of Pt-Au dendritic nanoparticles, and the relationship between kinetic parameters and nanoparticle structure was investigated. Quantitative analysis of ascorbic acid in the 1-15 mu mol/L range was performed with good linear relationship, and the detection limit was 78 nmol/L. At the same time, it's found that continuous reaction would reduce the catalytic performance of Pt-Au DNPs, but still has the potential to be reused, which is not common. Data from this research not only suggests a method for synthesizing Pt-Au DNPs, but also shows its potential for AA analysis in biological samples.
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