Enhanced Peroxidase-Like Performance of Gold Nanoparticles by Hot Electrons
| Autor: | Xing-Guo Nie, Yi Shi, Xing-Hua Xia, Chen Wang, Yuan-Yuan Dan, Jian Li |
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| Rok vydání: | 2016 |
| Předmět: |
Light
Metal Nanoparticles Biocompatible Materials Electrons 02 engineering and technology Biosensing Techniques 010402 general chemistry Photochemistry 01 natural sciences Catalysis Reaction rate chemistry.chemical_compound Oxidizing agent Organic chemistry Hydrogen peroxide Peroxidase Chemistry Organic Chemistry Substrate (chemistry) General Chemistry Hydrogen Peroxide Surface Plasmon Resonance 021001 nanoscience & nanotechnology 0104 chemical sciences Kinetics Colloidal gold Biocatalysis Spectrophotometry Gold 0210 nano-technology Biosensor |
| Zdroj: | Chemistry (Weinheim an der Bergstrasse, Germany). 23(28) |
| ISSN: | 1521-3765 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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