AI Article Synopsis
- This article explores how the catalytic activity of silver nanoparticles varies with the size of silica supports, focusing on nanoparticles that are 4 nm in diameter and silica spheres of different sizes (40, 78, 105 nm).
- The study finds that smaller silica supports (around 40 nm) enhance the catalytic activity of silver nanoparticles when reducing Rhodamine 6G using NaBH4.
- Analysis of UV-vis spectra indicates that the size and shape of the silver nanoparticles remain stable during the catalytic process, suggesting minimal loss of catalytic activity.
Article Abstract
The catalytic properties of silver nanoparticles supported on silica and the relation between catalytic activity of silver particles and the support (silica) size are investigated in the present article. The silver nanoparticles with 4 nm diameters were synthesized and were attached to silica spheres with sizes of 40, 78, 105 nm, respectively. The reduction of Rhodamine 6G (R6G) by NaBH4 was designed by using the SiO2/Ag core-shell nanocomposites as catalysts. The experimental results demonstrated that the catalytic activity of silica/silver nanoparticles depends on not only the concentration of catalysts (silver) but also the support silica size. Silver particles supported on small SiO2 spheres (approximately 40 nm) show high catalytic activity. Moreover, by making a comparison between the UV-vis spectra of the catalyst before and after the catalytic reaction, we found that the position of surface plasma resonance (SPR) peak of Ag nanoparticles changes little. The above results suggested that the size and morphology of silver particles were probably kept unchanged after the reduction of R6G and also implied that the catalytic activity of silver particles was hardly lost during the catalytic reaction.
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| http://dx.doi.org/10.1166/jnn.2006.320 | DOI Listing |
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