Abstract
This work presents the successful noncovalent attachment of similar to 5 nm diameter cadmium-sulfur-selenium (CdSSe) quantum dots on strips of anatase TiO2 nanobelts. The TiO2 nanobelts were hydrothermally synthesized from a strong alkaline solution and subsequently heat-treated to achieve the anatase phase. The self-assembled-monolayer (SAM) technique was employed to attach the quantum dots onto the nanobelts. Due to the hydrophobic nature of the quantum dots, the surface of the nanobelts was first self-assembled with a layer of hydrophobic organic layer before both mixtures were added together. The resulting nanostructure assembly and composition was confirmed via transmission-electron-microscopy (TEM) imaging, Raman spectroscopy, UV-visible absorption spectroscopy (UV-vis), and X-ray photoelectron spectroscopy (XPS). Both Raman and UV-vis spectroscopies indicate evidence of interactions between the quantum dots and nanobelts. The visible-light sensitizing effect of the quantum dots was demonstrated in photocurrent experiments.
Original language | English |
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Pages (from-to) | 10389-10393 |
Number of pages | 5 |
Journal | The Journal of Physical Chemistry C |
Volume | 111 |
Issue number | 28 |
Early online date | 27 Jun 2007 |
DOIs | |
Publication status | Published - 19 Jul 2007 |
Keywords
- photocatalytic properties
- nanocrystalline TIO2
- titanate nanotubes
- solar-cells
- nanowires
- electrodes
- raman
- CDSE
- films
- photosensitization