Journal
MICROCHIMICA ACTA
Volume 185, Issue 9, Pages -Publisher
SPRINGER WIEN
DOI: 10.1007/s00604-018-2981-5
Keywords
Laser; Local surface Plasmon resonance; Surface-enhanced Raman scattering; Au/Pt nanocomposite; Photothermal; Local electric field; Electron transfer; Nanozyme; Colorimetric determination; Hydrogen peroxide
Categories
Funding
- National Natural Science Foundation of China [11774048, 11374046]
- Key Laboratory for UV-Emitting Materials and Technology of Ministry of Education [130028723]
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Platinum nanoparticles (PtNPs) were uniformly grown on the surface of gold nanorods (AuNRs) by a laser irradiation procedure. Transmission electron microscopy confirmed that the PtNPs are uniformly grown on the surface of the AuNRs. The formation of PtNPs on the AuNRs leads to a red-shift of the absorption maximum from 734 nm to 766 nm. In addition, the efficiency of surface enhanced Raman scattering (SERS) is increased, but the photothermal conversion efficiency is decreased compared to pure AuNRs. The result indicates that electron transfer occurs between gold and platinum. The peroxidase mimicking effect of PtNPs, AuNRs and Au/Pt NRs by catalyzing the oxidation of colorless 3,3',5,5'-tetramethylbenzidine (TMB) to blue oxidized 3,3',5,5'-tetramethylbenzidine (oxTMB; a quinone) in the presence of H2O2. The catalytic activity of Au/Pt NRs is higher than that of sole AuNRs or PtNPs by factors of 4.2 and 2.1, respectively. Thus, Au/Pt NRs have been used for the detection of peroxide and the limit of detection is 0.04 mu M. This work provides an approach to integrate the peroxidase mimicking effect with SERS enhancement for potential application in detection.
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