Supramolecular Microfibrils of O-Phenylenediamine Dimers: Oxidation-induced Formation of Au Nanoparticle-decorated Nanoplates for H₂O₂ Detection

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.

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