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Immobilization of polyynes adsorbed on Ag nanoparticle aggregates into poly(vinyl alcohol) films

✍ Scribed by Shu Okada; Minoru Fujii; Shinji Hayashi

Publisher
Elsevier Science
Year
2011
Tongue
English
Weight
463 KB
Volume
49
Category
Article
ISSN
0008-6223

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✦ Synopsis

Composite films of poly(vinyl alcohol) containing polyynes adsorbed on aggregates of Ag nanoparticles were prepared and the stability of the Ag aggregates and polyynes was investigated by measuring the time evolution of absorption and surface-enhanced Raman spectra. The results indicate that the embedded aggregates of Ag nanoparticles and adsorbed polyynes are stable for a month. The high stability of the composite films made it possible to obtain an excitation profile of the surface-enhanced Raman spectrum. The excitation profile could be well reproduced by a theoretical calculation based on the electromagnetic mechanism of surface-enhanced Raman scattering.

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Thermal- and Sun-Promoted Generation of
Thermal- and Sun-Promoted Generation of Silver Nanoparticles Embedded into Poly(vinyl alcohol) Films
✍ Marco BernabΓ²; Andrea Pucci; Fernando Galembeck; Carlos Alberto de Paula Leite; πŸ“‚ Article πŸ“… 2009 πŸ› John Wiley and Sons 🌐 English βš– 543 KB

## Abstract Nanocomposites based on poly(vinyl alcohol) and silver nanoparticles were efficiently prepared by sun‐ and thermal‐promoted reduction processes. Uniaxial drawing of the Ag/PVA nanocomposites favoured the anisotropic distribution of silver particles, providing oriented films with polaris