A Sensitive Reduced Graphene Oxide-Antimony Nanofilm Sensor for Simultaneous Determination of PGMs

Abstract:

Electrochemical kinetics of Platinum Group Metals was studied by cyclic voltammetry and the concentration of these metal ions was successfully detected by adsorptive differential pulse cathodic stripping voltammetry using a GCE/rGO-SbNPs sensor. The sensor constructed in this work consisted of a reduced graphene oxide film that was impregnated with antimony nanoparticles. The constructed nanosensor provided an excellent platform for the simultaneous determination of Pd (II), Pt (II) and Rh (III) metal ions. The analytical curve was linear in the concentration range from 0 - 0.40 ng L^-1, and 0 - 0.56 ng L^-1 for Pd (II)-Rh (III) and Pt (II)-Rh (III), respectively. The detection limits of Pd (II) and Rh (III) were found to be 0.46 ng L^-1and 0.55 ng L^-1, respectively while for Pt (II) and Rh (III) it was 0.52 ng L^-1and 0.48 ng L^-1, respectively. The relative standard deviation from 5 measurements for 0.4 ng L^-1 Pd (II)-Rh (III) and Pt (II)-Rh (III) by using the GCE/rGO-SbNPs sensor was found to be 6.21% and 3.96%, respectively. Interferences by other metal ions were also studied.

• Periodical: Journal of Nano Research (Volume 44)
• Pages: 134-141
• DOI: https://doi.org/10.4028/www.scientific.net/JNanoR.44.134
• Online since: November 2016
• Authors: Bongiwe Silwana, Charlton van der Horst, Emmanuel Iheanyichukwu Iwuoha, Vernon Somerset*
• Keywords: Adsorptive Stripping Voltammetry, Antimony Nanoparticles, Dimethylglyoxime, Platinum Group Metals, Reduced Graphene Oxide, Simultaneous Determination, Synthesis

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