Fabrication and optical study of Ag@SnO2 core-shell structure nanoparticle thin films

• Published in: Applied physics. A, Materials science & processing Materials science & processing, 2011-08, Vol.104 (2), p.601-607
• Main Authors: Tripathy, Suraj Kumar, Jo, Jin-Nyoung, Song, Hyeon-Min, Yu, Yeon-Tae
• Format: Article
• Language: English
• Subjects: Characterization and Evaluation of Materials; Collective excitations (including excitons, polarons, plasmons and other charge-density excitations); Condensed Matter Physics; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures; Exact sciences and technology; Machines; Manufacturing; Nanocrystals and nanoparticles; Nanotechnology; Optical and Electronic Materials; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures; Physics; Physics and Astronomy; Processes; Surface and interface electron states; Surfaces and Interfaces; Thin Films
• ISSN: 0947-8396; 1432-0630
• DOI: 10.1007/s00339-011-6338-8

Ag@SnO 2 core-shell nanoparticles dispersed in poly-(vinyl) alcohol films were fabricated on glass substrate by employing a dip-coating technique. Synthesis of Ag@SnO 2 nanoparticles with core-shell morphology is carried out by a soft-chemical technique in aqueous phase at 60°C. Formation of core-shell structure is monitored by the red-shift of the surface plasmon band of Ag nanoparticles (from 390 to 410 nm) in the UV-visible spectrum. These nanoparticles are deposited on the glass substrate. The structure and morphology of these films were investigated by X-ray diffraction technique and field-emission transmission electron microscopy, respectively. Optical properties of these pseudo-solids were studied by UV-visible spectroscopy. Surface plasmon spectrum of the core-shell nanoparticles film remained unaltered with increase in the number of layers. However, silver nanoparticles films have shown peak broadening and development of additional peaks with increase in the number of layers. Our investigations showed that the surface plasmon band of the silver nanoparticles could be preserved by controlled deposition of the tin dioxide shell.