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Reductive determination of hydrogen peroxide with MWCNTs-Pd nanoparticles on a modified glassy carbon electrode

You, Jung-Min, Jeong, Yu Na, Ahmed, Mohammad Shamsuddin, Kim, Seul Ki, Choi, Hyun Chul, Jeon, Seungwon
Biosensors & bioelectronics 2011 v.26 no.5 pp. 2287-2291
X-ray photoelectron spectroscopy, biosensors, carbon nanotubes, detection limit, glassy carbon electrode, hydrogen peroxide, nanoparticles, palladium, transmission electron microscopy
This paper introduces the use of multi walled carbon nanotubes (MWCNTs) with palladium (Pd) nanoparticles in the electrocatalytic reduction of hydrogen peroxide (H₂O₂). We have developed and characterized a biosensor for H₂O₂ based on Nafion® coated MWCNTs-Pd nanoparticles on a glassy carbon electrode (GCE). The Nafion®/MWCNTs-Pd/GCE electrode was easily prepared in a rapid and simple procedure, and its application improves sensitive determination of H₂O₂. Characterization of the MWCNTs-Pd nanoparticle film was performed with transmission electron microscopy (TEM), Raman, and X-ray photoelectron spectroscopy (XPS). Cyclic voltammetry (CV) and amperometry (at an applied potential of −0.2V) measurements were used to study and optimize performance of the resulting peroxide biosensor. The proposed H₂O₂ biosensor exhibited a wide linear range from 1.0μM to 10mM and a low detection limit of 0.3μM (S/N=3), with a fast response time within 10s. Therefore, this biosensor could be a good candidate for H₂O₂ analysis.