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Light-induced high-spin state in ZnO nanoparticles
Aix Marseille Univ, France.
Aix Marseille Univ, France.
Aix Marseille Univ, France.
Linköping University, Department of Science and Technology, Physics, Electronics and Mathematics. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0001-8150-729X
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2020 (English)In: Nanotechnology, ISSN 0957-4484, E-ISSN 1361-6528, Vol. 31, no 9, article id 095707Article in journal (Refereed) Published
Abstract [en]

The effects of white-light irradiation on similar to 15.nm diameter ZnO nanoparticles are investigated by means of electron paramagnetic resonance, near liquid-nitrogen and liquid-helium temperatures. Under dark conditions, usual core- and surface-defects are detected, respectively, at g = 1.960 and g = 2.003. Under white-light illumination, the core-defect signal intensity is strongly increased, which is to be correlated to the light-induced conductivitys augmentation. Beside, a four-lines structure appears, with the same gravity center as that of the surface defects. Simulations and intensity power-dependence measurements show that this four-line-structure is very likely to arise from a localized high spin S = 2, induced by light irradiation, and subjected to a weak axial anisotropy. At 85K, this high-spin state can last several hours after the light-irradiation removal, probably due to highly spin-forbidden recombination process. The possible excited resonant complexes at the origin of this signal are discussed. Other light-induced S = 1/2-like centers are detected as well, which depend on the nanoparticles growth conditions.

Place, publisher, year, edition, pages
IOP PUBLISHING LTD , 2020. Vol. 31, no 9, article id 095707
Keywords [en]
ZnO nanoparticle; EPR; light-matter interaction; high spin
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:liu:diva-164376DOI: 10.1088/1361-6528/ab57f1ISI: 000515092900007PubMedID: 31726431OAI: oai:DiVA.org:liu-164376DiVA, id: diva2:1415870
Note

Funding Agencies| [CNRS-FR3443]

Available from: 2020-03-20 Created: 2020-03-20 Last updated: 2024-01-08

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