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Catalytic and peroxidase-like activity of carbon based-AuPd bimetallic nanocomposite produced using carbon dots as the reductant

Author:
Yang, Liuqing, Liu, Xiaoying, Lu, Qiujun, Huang, Na, Liu, Meiling, Zhang, Youyu, Yao, Shouzhuo
Source:
Analytica chimica acta 2016 v.930 pp. 23-30
ISSN:
0003-2670
Subject:
X-ray photoelectron spectroscopy, analytical chemistry, carbon, catalysts, catalytic activity, colorimetry, detection limit, gold, hydrogen peroxide, nanocomposites, nanogold, nanoparticles, p-nitrophenol, palladium, reducing agents, transmission electron microscopy
Abstract:
In this report, carbon-based AuPd bimetallic nanocomposite (AuPd/C NC) was synthesized using carbon dots (C-dots) as the reducing agent and stabilizer by a simple green sequential reduction strategy, without adding other agents. The as synthesized AuPd/C NC showed good catalytic activity and peroxidase-like property. The structure and morphology of these nanoparticles were clearly characterized by UV–Vis spectroscopy, X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM). The AuPd/C NC catalyst exhibits noticeably higher catalytic activity than Pd and Au nanoparticles in catalysis reduction of 4-nitrophenol (4-NP). Moreover, based on the high peroxidase-like property of AuPd/C NC, a new colorimetric detection method for hydrogen peroxide (H2O2) has been designed using 3,3′,5,5′-tetramethyl-benzidine (TMB) as the substrate, which provides a simple and sensitive means to detect H2O2 in wide linear range of 5 μM–500 μM and 500 μM–4 mM with low detection limit of 1.6 μM (S/N = 3). Therefore, the facile synthesis strategy for bimetallic nanoparticles by the mild reductant of carbon dot will provide some new thoughts for preparing of carbon-based metal nanomaterials and expand their application in catalysis and analytical chemistry areas.
Agid:
5285577