Sonochemical fabrication of Fe3O4 nanoparticles on reduced graphene oxide for biosensors

► Fe3O4 nanoparticles are fabricated uniformly on the surface of reduced graphene oxide by a sonochemical method. ► The particle size of Fe3O4 are controlled at around 30–40nm. ► The resultant Fe3O4/RGO composite shows a high biosensor performance. ► RGO promotes the electron transfer between the pe...

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Bibliographic Details
Published in:Ultrasonics sonochemistry 2013-05, Vol.20 (3), p.872-880
Main Authors: Zhu, Shenmin, Guo, Jingjing, Dong, Junping, Cui, Zhaowen, Lu, Tao, Zhu, Chenglin, Zhang, Di, Ma, Jun
Format: Article
Language:English
Subjects:
Biosensing Techniques - instrumentation
Biosensing Techniques - methods
Biosensor
Fe3O4 nanoparticles
Graphene
Graphite - chemistry
Hydrogen Peroxide - analysis
Magnetite Nanoparticles - chemistry
Microscopy, Electron, Scanning
Microscopy, Electron, Transmission
Oxidation-Reduction
Oxides - chemistry
Particle Size
Sonication - methods
Surface Properties
Ultrasonication
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Summary:► Fe3O4 nanoparticles are fabricated uniformly on the surface of reduced graphene oxide by a sonochemical method. ► The particle size of Fe3O4 are controlled at around 30–40nm. ► The resultant Fe3O4/RGO composite shows a high biosensor performance. ► RGO promotes the electron transfer between the peroxide and electrode surface. This study synthesized Fe3O4 nanoparticles of 30–40nm by a sonochemical method, and these particles were uniformly dispersed on the reduced graphene oxide sheets (Fe3O4/RGO). The superparamagnetic property of Fe3O4/RGO was evidenced from a saturated magnetization of 30emu/g tested by a sample-vibrating magnetometer. Based on the testing results, we proposed a mechanism of ultrasonic waves to explain the formation and dispersion of Fe3O4 nanoparticles on RGO. A biosensor was fabricated by modifying a glassy carbon electrode with the combination of Fe3O4/RGO and hemoglobin. The biosensor showed an excellent electrocatalytic reduction toward H2O2 at a wide, linear range from 4×10−6 to 1×10−3M (R2=0.994) as examined by amperometry, and with a detection limit of 2×10−6M. The high performance of H2O2 detection is attributed to the synergistic effect of the combination of Fe3O4 nanoparticles and RGO, promoting the electron transfer between the peroxide and electrode surface.
ISSN:1350-4177
1873-2828
DOI:10.1016/j.ultsonch.2012.12.001