Journal
NANOSCALE
Volume 4, Issue 11, Pages 3501-3506Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2nr30310h
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Funding
- National Natural Science Foundation of China [20873118, 20574058]
- Program for New Century Excellent Talents in University [NCET-08-0665]
- Program for Science & Technology Innovation Talents in Universities of Henan Province [2008 HASTIT016]
- Innovation Scientists and Technicians Troop Construction Projects of Henan Province [104100510001, 094300510064]
- Henan Province Science and Technology Key Project [082102230036]
- Research Project of Basic and Advanced Technology of Henan Province [112300410106]
- Natural Science Foundation of Henan Province, China [2009B150024, 2011B150035]
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Copper sulfide (CuS) concave polyhedral superstructures (CPSs) have been successfully prepared in an ethanolic solution by a simple solvothermal reaction without the use of surfactants or templates. Two typical well defined, high symmetry CuS concave polyhedrons, forming a concave truncated cuboctahedron and icosahedron were prepared. The effect of the reaction time, temperature and different Cu ion and sulfur sources on the formation of CuS CPSs were investigated and a possible formation mechanism was proposed and discussed based on gas chromatography-mass spectrometry. More importantly, we found, for the first time, that the CuS CPSs exhibit intrinsic peroxidase-like activity, as they can quickly catalyze the oxidation of typical horseradish peroxidase (HRP) substrates, 3,3', 5,5'-tetramethylbenzidine (TMB) and o-phenylenediamine (OPD), in the presence of hydrogen peroxide. In addition to the recent discoveries regarding peroxidase mimetics on Fe3O4 NPs and carbon nanostructures, our findings suggest a new kind of candidate for peroxidase mimics. This may open up a new application field of CuS micro-nano structures in biodetection, biocatalysis and environmental monitoring.
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