Photochromism and two-photon luminescence of Ag-TiO(2) granular composite films activated by near infrared ps/fs pulses.
Opt Express
; 15(21): 13924-9, 2007 Oct 17.
Article
em En
| MEDLINE
| ID: mdl-19550664
ABSTRACT
We reported photochromism and largely enhanced visible two-photon luminescence (TPL) of Ag-TiO(2) granular composite films by using ps/fs laser at the wavelength of 800 nm. Three types of photochromism spectra were observed when the Ag atom fraction are less than, comparable to and larger than the percolation threshold. The strong surface-plasmon-resonance enhanced visible TPL emissions near Ag(2)O transition band from the photoactivated Ag-TiO(2) samples were also observed. Furthermore, we found that the TPL intensity saturatedly increased while the absorbance at 800 nm exponentially decreased with the same rate as the increasing of photoactivation time, which means that both photochromism and TPL of Ag-TiO(2) composite films are originated from the photo-oxidation of Ag to Ag(+). These observations exhibit the multifunctional features of Ag nanoparticle materials.
Buscar no Google
Base de dados:
MEDLINE
Idioma:
En
Ano de publicação:
2007
Tipo de documento:
Article