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Self-assembly directed synthesis of Au nanorices induced by polyaniline and their enhanced peroxidase-like catalytic properties

Abstract

The self-assembly of noble metal nanoparticles into new-fashioned one, two and three-dimensional structures is very important due to their superior properties in optics, electrics, catalysis, chemical sensing compared with the individual nanoparticles. Here, we first report a facile one-step approach that allows the fabrication of assembled Au nanorices induced by polyaniline (PANI). During the synthesis, a complex of HAuCl4-(3-aminopropyl)triethoxysilane (APTES) acts as both the soft template and oxidant, then the reduction of HAuCl4 is accompanied with the oxidation of aniline, resulting in Au nanorices within PANI matrix. The application of the prepared Au/PANI nanorices as the enzymatic mimic toward the oxidation of 3,3’,5,5’-tetramethylbenzidine (TMB) is demonstrated. The resultant Au/PANI nanorices display an enhanced peroxidase-like catalytic activity compared with individual Au nanospheres and PANI nanofibers alone, revealing a synergistic effect between Au and PANI components in Au/PANI nanorices. The Au/PANI nanorices are also used as an efficient surface-enhanced Raman scattering (SERS) substrate for in-situ monitoring the oxidation process of TMB during the peroxidase-like catalytic reaction. On the basis of the SERS technique, a discernible detection of H2O2 as low as 10-8 M is obtained. We envision that such a system may show more potential applications in biocatalysis, disease diagnosis and environmental monitoring.

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Publication details

The article was received on 22 Apr 2017, accepted on 08 Jun 2017 and first published on 08 Jun 2017


Article type: Paper
DOI: 10.1039/C7TC01761H
Citation: J. Mater. Chem. C, 2017, Accepted Manuscript
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    Self-assembly directed synthesis of Au nanorices induced by polyaniline and their enhanced peroxidase-like catalytic properties

    W. Song, M. Chi, M. Gao, B. Zhao, C. Wang and X. Lu, J. Mater. Chem. C, 2017, Accepted Manuscript , DOI: 10.1039/C7TC01761H

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