Enhanced luminescence of silver nanoclusters in mesoporous film

• Published in: Physics letters. A Vol. 372; no. 31; pp. 5193 - 5197
• Main Authors: Aiboushev, A.V., Astafiev, A.A., Lozovik, Yu.E., Merkulova, S.P., Nadtochenko, V.A., Sarkisov, O.M.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 28-07-2008
• ISSN: 0375-9601; 1873-2429
• DOI: 10.1016/j.physleta.2008.05.083

Luminescence of silver nanoparticles photodeposited on titan dioxide nanoparticles of mesoporous film is studied. Luminescence was registered under the two-photon excitation by femtosecond laser pulses of
Ti
:
sapphire laser
. It occurs that Ag/TiO
2 mesoporous films have high concentration of bright luminescence spots which reveal stability to degradation under long illumination. Various configurations of silver nanoparticles are analyzed to explain the physics of bright luminescence spots (“hot spots”). Luminescence intensity reveals “hot spots” dependence on excitation laser pulse polarization. Properties of Ag/TiO
2 system show its promising usage for single molecule spectroscopy and biological objects visualization.