Studies on the photocatalysis of core-shelled SiO2–Ag nanospheres by controlled surface plasmon resonance under visible light

• Published in: Applied surface science Vol. 311; pp. 399 - 404
• Main Authors: Pan, Ko-Ying, Liang, Yi-Fan, Pu, Ying-Chih, Hsu, Yung-Jung, Yeh, Jien-Wei, Shih, Han C.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 30.08.2014; Elsevier
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Core-shelled silica–silver nanospheres (SiO2@Ag NSs); Cross-disciplinary physics: materials science; rheology; Deposition; Exact sciences and technology; Infra-red region; Nanoparticles; Nanospheres; Physics; Plasmons; Pollutants; Red shift; Seed-mediated method; Silicon dioxide; Silver; Surface chemistry; Surface plasmon resonance (SPR); Seed-mediated method; Red shift; Surface plasmon resonance (SPR); Infra-red region; Core-shelled silica–silver nanospheres (SiO2@Ag NSs); Silver; @Ag NSs; Inorganic compounds; Silicon oxides; Core-shelled silica-silver nanospheres (SiO; Transition elements; Spectral line shift; Surface plasmons
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2014.05.074

•We successfully yield the core-shelled SiO2–Ag nanospheres.•Proof the Ag shell's size effect the SPR conditions.•Enhancing the degradation efficiency is controlled by Ag nanoparticles’ size.•We replaced the formaldehyde and ammonia with glucose as the reduction in seed-mediated process. Abundant core-shelled silica–silver nanospheres with uniform diameter and morphology were successfully synthesized by Stöber and seed-mediated method, in sequence. By the different additions of glucose, the silver nanoparticles were deposited on silica spheres by redox reaction, which well controlled in the range from 10 to 50nm. The surface plasmon resonance absorption band shifted toward infra-red region and became broader gradually during the dimensions of silver nanoparticles were increased in the growth range. The amazing data imply that using core-shelled silica–silver nanospheres efficiently enhances the degradation of the organic pollutants under solar energy, which means the core-shelled silica–silver nanospheres is not only a cost-effective route but an energy-saving way to our planet.