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The Effects of Aging on the Luminescence of PEG-Coated Water-Soluble ZnO Nanoparticle Solutions
- Source :
- The Journal of Physical Chemistry C. 112:14292-14296
- Publication Year :
- 2008
- Publisher :
- American Chemical Society (ACS), 2008.
-
Abstract
- Water-soluble ZnO nanoparticles coated with polyethylene glycol biscarboxymethyl (PEG(COOH)2) were prepared in ethanol/water solutions. The ZnO nanoparticles have a hexagonal structure with an average size of 10 nm. Three different luminescence bands are observed from the nanoparticle solutions: green emission at 530 nm from surface states or defects, UV emission at 380 nm from the ZnO exciton, and an emission band at around 338 nm from the PEG(COOH)2. The fresh as-prepared samples have very strong green emission at 530 nm from surface states or defects but very weak excitonic emission at 380 nm. After dilution with ethanol, the green emission decreases in intensity and the excitonic emission increases. In the diluted samples, the excitonic luminescence intensity increases with storage time. This intensity increase is attributed to surface passivation by CH3COO− ligands resulting from precursor reactions in the ethanol solvent.
- Subjects :
- Materials science
Passivation
Exciton
Inorganic chemistry
Nanoparticle
Polyethylene glycol
Photochemistry
Surfaces, Coatings and Films
Electronic, Optical and Magnetic Materials
Solvent
chemistry.chemical_compound
General Energy
chemistry
PEG ratio
Physical and Theoretical Chemistry
Luminescence
Surface states
Subjects
Details
- ISSN :
- 19327455 and 19327447
- Volume :
- 112
- Database :
- OpenAIRE
- Journal :
- The Journal of Physical Chemistry C
- Accession number :
- edsair.doi...........ed5d6ce802a9b42238851eb8d2d92518
- Full Text :
- https://doi.org/10.1021/jp803649k