Nanostructured titania films sensitized by quantum dot chalcogenides

The optical and structural properties of cadmium and lead sulfide nanocrystals deposited on mesoporous TiO 2 substrates via the successive ionic layer adsorption and reaction method were comparatively investigated by reflectance, transmittance, micro-Raman and photoluminescence measurements. Enhance...

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Bibliographic Details
Published in:Nanoscale research letters 2011-03, Vol.6 (1), p.266-266, Article 266
Main Authors: Kontos, Athanassios G, Likodimos, Vlassis, Vassalou, Eleni, Kapogianni, Ioanna, Raptis, Yannis S, Raptis, Costas, Falaras, Polycarpos
Format: Article
Language:English
Subjects:
Chemistry and Materials Science
Materials Science
Molecular Medicine
Nano Express
Nanochemistry
Nanoscale Science and Technology
Nanotechnology
Nanotechnology and Microengineering
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Summary:The optical and structural properties of cadmium and lead sulfide nanocrystals deposited on mesoporous TiO 2 substrates via the successive ionic layer adsorption and reaction method were comparatively investigated by reflectance, transmittance, micro-Raman and photoluminescence measurements. Enhanced interfacial electron transfer is evidenced upon direct growth of both CdS and PbS on TiO 2 through the marked quenching of their excitonic emission. The optical absorbance of CdS/TiO 2 can be tuned over a narrow spectral range. On the other side PbS/TiO 2 exhibits a remarkable band gap tunability extending from the visible to the near infrared range, due to the distinct quantum size effects of PbS quantum dots. However, PbS/TiO 2 suffers from severe degradation upon air exposure. Degradation effects are much less pronounced for CdS/TiO 2 that is appreciably more stable, though it degrades readily upon visible light illumination.
ISSN:1556-276X
1931-7573
1556-276X
DOI:10.1186/1556-276X-6-266