Flowerlike submicrometer gold particles: Size- and surface roughness-controlled synthesis and electrochemical characteri
- PDF / 1,166,470 Bytes
- 6 Pages / 584.957 x 782.986 pts Page_size
- 88 Downloads / 279 Views
Dongxue Hana) State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, and Graduate University of the Chinese Academy of Sciences, Chinese Academy of Sciences, Changchun 130022, People’s Republic of China; and Laboratory of Analytical Chemistry, Process Chemistry Centre, A˚bo Akademi University, A˚bo-Turku, FI-20500, Finland
Jiangfeng Song State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, and Graduate University of the Chinese Academy of Sciences, Chinese Academy of Sciences, Changchun 130022, People’s Republic of China
Ari Ivaska Laboratory of Analytical Chemistry, Process Chemistry Centre, A˚bo Akademi University, A˚bo-Turku, FI-20500, Finland
Li Niu State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, and Graduate University of the Chinese Academy of Sciences, Chinese Academy of Sciences, Changchun 130022, People’s Republic of China; and Laboratory of Analytical Chemistry, Process Chemistry Centre, A˚bo Akademi University, A˚bo-Turku, FI-20500, Finland (Received 6 January 2010; accepted 31 March 2010)
Flowerlike submicrometer gold particles were synthesized through a simple one-step method using p-diaminobenzene as a reductant in the presence of poly(sodium 4-styrenesulfonate) in aqueous solution. The particle size with diameters ranging from 267 to 725 nm could be tuned by varying the molar ratio of poly(sodium 4-styrenesulfonate) to HAuCl4, which also resulted in tunable roughness. The gold particles were confirmed by scanning electron microscopy, energy dispersive x-ray spectroscopy, x-ray diffraction, and x-ray photoelectron spectroscopy. Cyclic voltammetry showed that the specific surface area of the flowerlike particles was larger than that of sphere particles. The obtained flowerlike particles with higher surface area also exhibited higher electrocatalytic activity toward H2O2 and O2. The increase of electrocatalytic activity could be attributed to the increase of the active surface area.
I. INTRODUCTION
Within the past decades, the morphological control of metal nanoparticles has been the focus of intensive research in view of the potential applications related to their unique optical, electronic, and catalytical properties, which tightly depended on their size, shape, and structure.1–6 A variety of approaches have been developed for the size- and shape-controlled synthesis of nanospheres,7–9 nanocubes,10,11 nanorods,12,13 nanowires,14,15 nanobelts,16 nanoplates,17–19 nanoprisms,20 and nanotetrahexahedral.21 a)
Address all correspondence to this author. e-mail: [email protected] DOI: 10.1557/JMR.2010.0242 J. Mater. Res., Vol. 25, No. 9, Sep 2010
http://journals.cambridge.org
Downloaded: 24 Mar 2015
Commonly used methods for the controlled synthesis used capping agents, such as ligands,7,22 surfactants,23,24 polymers,10,25–27 or dendrimers,28 to confine the growth in the nanometer regime. For example, one of the most widely used methods is the reduction of tetrachloroaurate i
Data Loading...
