Abstract
The direct mix of aqueous FeCl3 and o-phenylenediamine (OPD) solutions at room temperature leads to supramolecular microfibrils of OPD dimers generated by the oxidation of OPD monomers by FeCl3. In this paper, we demonstrate that the subsequent treatment of such microfibrils with a HAuCl4 aqueous solution leads to Au nanoparticle (AuNP)-decorated nanoplates. The possible formation mechanism involved is also discussed. It is found that such nanocomposites can effectively catalyze both oxidization and reduction of H2O2. The sensor constructed with these nanocomposites exhibits a fast amperometric response time of less than 4 s. The linear detection range is estimated to be from 100 μM to 170 mM (r=0.997), and the detection limit is estimated to be 8 μM at a signal-to-noise ratio of 3.
Keywords: Supramolecular microfibril, Au nanoparticle, nanoplate, H2O2 detection
Current Nanoscience
Title:Supramolecular Microfibrils of O-Phenylenediamine Dimers: Oxidation-induced Formation of Au Nanoparticle-decorated Nanoplates for H2O2 Detection
Volume: 8 Issue: 2
Author(s): Wenbo Lu, Yonglan Luo, Guohui Chang, Abdullah M. Asiri, Abdulrahman O. Al-Youbi and Xuping Sun
Affiliation:
Keywords: Supramolecular microfibril, Au nanoparticle, nanoplate, H2O2 detection
Abstract: The direct mix of aqueous FeCl3 and o-phenylenediamine (OPD) solutions at room temperature leads to supramolecular microfibrils of OPD dimers generated by the oxidation of OPD monomers by FeCl3. In this paper, we demonstrate that the subsequent treatment of such microfibrils with a HAuCl4 aqueous solution leads to Au nanoparticle (AuNP)-decorated nanoplates. The possible formation mechanism involved is also discussed. It is found that such nanocomposites can effectively catalyze both oxidization and reduction of H2O2. The sensor constructed with these nanocomposites exhibits a fast amperometric response time of less than 4 s. The linear detection range is estimated to be from 100 μM to 170 mM (r=0.997), and the detection limit is estimated to be 8 μM at a signal-to-noise ratio of 3.
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Cite this article as:
Lu Wenbo, Luo Yonglan, Chang Guohui, M. Asiri Abdullah, O. Al-Youbi Abdulrahman and Sun Xuping, Supramolecular Microfibrils of O-Phenylenediamine Dimers: Oxidation-induced Formation of Au Nanoparticle-decorated Nanoplates for H2O2 Detection, Current Nanoscience 2012; 8 (2) . https://dx.doi.org/10.2174/157341312800167696
DOI https://dx.doi.org/10.2174/157341312800167696 |
Print ISSN 1573-4137 |
Publisher Name Bentham Science Publisher |
Online ISSN 1875-6786 |
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