Thermal anealing effects on Ag/TiO2 thin films prepared by ink-jet printing
(English)Manuscript (preprint) (Other academic)
The effects of heat treatment on both the phase structure and the electronic band structure were studied for Ag/TiO2 composite films prepared by inkjet printing. Ag nanoparticles can form ‘metal-bridge’ to link TiO2 particles in the mesoporous structured films and improve the transport properties of the films. The distribution of Ag in the composite films shows dependence on the annealing conditions: Ag clusters were observed at high annealing temperature (>600 °C), and they can be annihilated by a longer time annealing. Comparing with pure TiO2 films, the decreased intensity of the photoluminescence (PL) emission spectra of Ag/TiO2 composite films indicates that the doped Ag atoms could act as traps to capture electron and inhabit the recombination of electron-hole pairs. From the identifiable PL emission peaks, the band structure of the films is deduced.
Ink-jet printing, annealing, microstructure, photoluminescence
Composite Science and Engineering
IdentifiersURN: urn:nbn:se:kth:diva-102012OAI: oai:DiVA.org:kth-102012DiVA: diva2:550324
QS 20122012-09-062012-09-062012-09-07Bibliographically approved