Journal
ANALYST
Volume 140, Issue 15, Pages 5251-5256Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5an00809c
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Funding
- National Natural Science Foundation of China [21175023]
- Program for New Century Excellent Talents in University [NCET-12-0618]
- Natural Science Foundation of Fujian Province [2012J06019, 2014J07009]
- Medical Elite Cultivation Program of Fujian Province [2013-ZQN-ZD-25]
- Medical Innovation Project of Fujian Province [2014-CX-6]
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A facile approach is proposed for the growth of platinum nanoparticles on graphene oxide (PtNPs/GO). The resulting PtNPs/GO hybrid has been proved to function as peroxidase mimics that can catalyze the oxidation of peroxidase substrates in the presence of hydrogen peroxide (H2O2). Kinetic studies indicate that the PtNPs/GO nanocomposite has a considerably higher affinity for both 3,3', 5,5'-tetramethyl-benzidine (TMB) and H2O2 than those of other platinum-based peroxidase mimics. Furthermore, colorimetric recognition and sensing of L-cysteine with high sensitivity and selectivity is presented based on target-induced shielding against the peroxidase-like activity of PtNPs/GO. We envision that this material will be an ideal candidate for a wide range of potential applications in the fields of biomedicine and environmental chemistry.
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