Change search
ReferencesLink to record
Permanent link

Direct link
Photoreactivity of ZnO nanoparticles in visible light: Effect of surface states on electron transfer reaction
Show others and affiliations
2009 (English)In: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 105, no 7Article in journal (Refereed) Published
Abstract [en]

Wide band gap metal oxide semiconductors such as zinc oxide (ZnO) show visible band photolysis that has been employed, among others, to degrade harmful organic contaminants into harmless mineral acids. Metal oxides show enhanced photocatalytic activity with the increase in electronic defects in the crystallites. By introducing defects into the crystal lattice of ZnO nanoparticles, we observe a redshift in the optical absorption shifting from the ultraviolet region to the visible region (400-700 nm), which is due to the creation of intermediate defect states that inhibit the electron hole recombination process. The defects were introduced by fast nucleation and growth of the nanoparticles by rapid heating using microwave irradiation and subsequent quenching during the precipitation reaction. To elucidate the nature of the photodegradation process, picosecond resolved time correlated single photon count (TCSPC) spectroscopy was carried out to record the electronic transitions resulting from the de-excitation of the electrons to their stable states. Photodegradation and TCSPC studies showed that defect engineered ZnO nanoparticles obtained through fast crystallization during growth lead to a faster initial degradation rate of methylene blue as compared to the conventionally synthesized nanoparticles.

Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2009. Vol. 105, no 7
National Category
Nano Technology
URN: urn:nbn:se:kth:diva-175245DOI: 10.1063/1.3100221ISI: 000266633500076ScopusID: 2-s2.0-65249127396OAI: diva2:918237

QC 20160412

Available from: 2016-04-11 Created: 2015-10-10 Last updated: 2016-04-12Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full textScopus

Search in DiVA

By author/editor
Dutta, Joydeep
In the same journal
Journal of Applied Physics
Nano Technology

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 20 hits
ReferencesLink to record
Permanent link

Direct link