Facile synthesis of the SiO 2 /Au hybrid microspheres for excellent catalytic performance
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Bin-Bin Ding Department of Medical Materials and Rehabilitation Engineering, School of Medical Engineering, Hefei University of Technology, Hefei 230009, People’s Republic of China
Yan Zhu, Tai-Ya Wang, Bi-Cui Chen, and Yong Shaoa) Department of Chemistry, College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua 321004, People’s Republic of China
Ming-Qi Chen and Pan Zheng Department of Medical Materials and Rehabilitation Engineering, School of Medical Engineering, Hefei University of Technology, Hefei 230009, People’s Republic of China
Yu-Ling Zhao Department of Chemistry, College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua 321004, People’s Republic of China
Hai-Sheng Qianb) Department of Medical Materials and Rehabilitation Engineering, School of Medical Engineering, Hefei University of Technology, Hefei 230009, People’s Republic of China (Received 28 March 2014; accepted 18 June 2014)
Au nanoparticles (Au NPs) have attracted much interest owing to their unique optical properties. In this paper, a facile process has been successfully developed to synthesize the SiO2/Au hybrid microspheres with a diameter of 200 nm via the galvanic replacement of SiO2/Ag hybrid microspheres and chlorauric acid (HAuCl4) solution. The as-prepared products were investigated by x-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM, JEOL-6700F), and transmission electron microscopy (TEM, JEOL 3010), respectively. As expected, the as-prepared SiO2/Au hybrid microspheres show strong chemical stability and superior catalytic reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP). The SiO2/Au hybrid microspheres would be found widely used in wastewater treatment, catalytic reaction, bacteriostatic and bactericidal applications.
I. INTRODUCTION
Noble metal nanoparticles have attracted much interest owing to their unique properties, which has been widely used in various research fields, such as electrocatalysis,1,2 surface-enhanced roman scattering,3 sensing,4 information storage,5 antibacterial, cancer cell imaging, and photothermal therapy.6,7 Over the past decades, much effort has been made to fabricate gold nanoparticles (Au NPs) owing to Au nanoparticles with fascinating optical properties resulting in their important application in catalysis reaction with the characteristics of high reactivity and selectivity.8,9 Up to date, deposition–precipitation,10 chemical reduction,11,12 galvanic replacement,13 and
Address all correspondence to these authors. a) e-mail: [email protected] b) e-mail: [email protected] DOI: 10.1557/jmr.2014.146
seed-mediated growth14 for the synthesis of Au nanoparticles (Au NPs) have been achieved so far. In contrast to other preparation methods, solution approaches including chemical reduction methods are usually carried out in an easy and mild way, which generally involves the reduction reagents used, such as hydroxylamine hydrochloride,15 carboxylic acid,16 glucose,17 hydrazine hydrate,18 and so on. As is well known, the catalytic properties of
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