Document Type
Article
Publication Date
6-2020
Abstract
A composite sensor consisting of two separate inorganic layers of Prussian blue (PB) and a composite of cerium oxide nanoparticles (CeNPs) and graphene oxide (GO), is tested with •OH radicals. The signals from the interaction between the composite layers and •OH radicals are characterized using cyclic voltammetry (CV). The degradation of PB in the presence of H2O2 and •OH radicals is observed and its impact on the sensor efficiency is investigated. The results show that the composite sensor differentiates between the solutions with and without •OH radicals by the increase of electrochemical redox current in the presence of •OH radicals. The redox response shows a linear relation with the concentration of •OH radicals where the limit of detection, LOD, is found at 60 µM (100 µM without the PB layer). When additional composite layers are applied on the composite sensor to prevent the degradation of PB layer, the PB layer is still observed to be degraded. Furthermore, the sensor conductivity is found to decrease with the additional layers of composite. Although the CeNP/GO/PB composite sensor demonstrates high sensitivity with •OH radicals at low concentrations, it can only be used once due to the degradation of PB.
DOI
10.3390/nano10061136
Source Publication
Nanomaterials
Recommended Citation
Duanghathaipornsuk, S., Kanel, S., Haushalter, E. F., Ruetz, J. E., & Kim, D.-S. (2020). Detection of hydroxyl radicals using cerium oxide/graphene oxide composite on Prussian blue. Nanomaterials, 10(6), 1136. https://doi.org/10.3390/nano10061136
Comments
© 2020 The Authors. This is an open access article published by MDPI and distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. CC BY 4.0
Sourced from the published version of record cited below.