Nanostructured titania films sensitized by quantum dot chalcogenides
| Autor: | C. Raptis, Ioanna Kapogianni, Polycarpos Falaras, Eleni Vassalou, Yannis S. Raptis, Athanassios G. Kontos, Vlassis Likodimos |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2011 |
| Předmět: |
Photoluminescence
Materials science Band gap Nanochemistry Nanotechnology 02 engineering and technology 010402 general chemistry 01 natural sciences chemistry.chemical_compound Materials Science(all) lcsh:TA401-492 Transmittance General Materials Science Lead sulfide Nano Express business.industry 021001 nanoscience & nanotechnology Condensed Matter Physics 0104 chemical sciences Nanocrystal chemistry Quantum dot Optoelectronics lcsh:Materials of engineering and construction. Mechanics of materials 0210 nano-technology business Visible spectrum |
| Zdroj: | Nanoscale Research Letters Nanoscale Research Letters, Vol 6, Iss 1, p 266 (2011) |
| ISSN: | 1556-276X |
| DOI: | 10.1186/1556-276X-6-266 |
| Popis: | The optical and structural properties of cadmium and lead sulfide nanocrystals deposited on mesoporous TiO2 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 TiO2 through the marked quenching of their excitonic emission. The optical absorbance of CdS/TiO2 can be tuned over a narrow spectral range. On the other side PbS/TiO2 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/TiO2 suffers from severe degradation upon air exposure. Degradation effects are much less pronounced for CdS/TiO2 that is appreciably more stable, though it degrades readily upon visible light illumination. |
| Databáze: | OpenAIRE |
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