Journal
MATERIALS SCIENCE & ENGINEERING C-MATERIALS FOR BIOLOGICAL APPLICATIONS
Volume 90, Issue -, Pages 610-620Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.msec.2018.05.004
Keywords
FePt/GO; Peroxidase; Colorimetric; Sensor; H2O2
Categories
Funding
- National Natural Science Foundation of China [21271119]
- Innovation Fund of Science & Technology of Graduate Students [SDKDYC170110, SDKDYC180239]
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Bimetallic-based nanoparticles usually display improved catalytic performance compared to monometallic counterparts. Herein, the well-dispersed FePt nanoparticles decorated on the surface of graphene oxide (GO) nanosheets have been successfully synthesized by a simple polyol protocol method. The FePt/GO nanocomposites were characterized by powder X-ray diffraction (XRD), transmission electron microscopy (TEM), energy dispersive spectrometer (EDS), magnetic property measurement system (MPMS), and Fourier transform infrared spectra (FT-IR), respectively. Interestingly, FePt/GO nanocomposites demonstrated the highly intrinsic peroxidase-like activity and can rapidly catalyze to oxidize the substrate 3,3',5,5'-tetramethylbenzidine (TMB) into a blue product oxidized TMB (oxTMB), in the presence of H2O2 only in 30 s observed by the naked eye. Electron spin resonance (ESR) revealed that the underlying catalytic mechanism of FePt/GO nanocomposites was attributed to the generation of hydroxyl radicals (center dot OH) from decomposing of H2O2, due to the synergistic effect between FePt nanoparticles and GO nanosheets. Moreover, H2O2 can be detected over a wide linear detection range of 0.03-0.5 mM with a detection limit of 2.2 x 10(-5)M. Based on the mimic enzyme FePt/GO, a colorimetric ultrasensitive H2O2 sensor was constructed with the help of TMB in buffer solution.
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