Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 23, Issue 28, Pages 6717-+Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201605380
Keywords
enzyme mimics; gold nanoparticles; hot electrons; localized surface plasmon resonance; reaction mechanism
Categories
Funding
- National Natural Science Foundation of China [21327902, 21575163, 21635004]
- Natural Science Foundation of Jiangsu Province [BK20151437]
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Enzyme mimics have been widely used as alternatives to natural enzymes. However, the catalytic performances of enzyme mimics are often decreased due to different spatial structures or absence of functional groups compared to natural enzymes. Here, we report a highly efficient enzyme-like catalytic performance of gold nanoparticles (AuNPs) by visible-light stimulation. The enzyme-like reaction is evaluated by the catalytic reaction of AuNPs oxidizing a typical chromogenic substrate 3,3,5,5-tetramethylbenzydine (TMB) with hydrogen peroxide as an oxidant. From investigations of the wavelength-dependent reaction rate, radical capture, hole-donor addition, and dark-field scattering spectroscopy experiments, it is revealed that the strong plasmonic absorption of AuNPs facilitates generation of hot electrons, which are transfered from AuNPs to the adsorbed reactant molecule, greatly promoting the catalytic performance of the enzyme-like catalytic reaction. The present work provides a simple method for improving the performance of enzyme mimics, which is expected to find further application in the field of plasmon-enhanced biocatalysis and biosensors.
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