O2 adsorption dependent photoluminescence emission from metal oxide nanoparticles
Gheisi A, Neygandhi C, Sternig A, Carrasco E, Marbach H, Thomele D, Diwald O (2014)
Publication Type: Journal article, Original article
Publication year: 2014
Journal
Book Volume: 16
Pages Range: 23922-23929
Journal Issue: 43
DOI: 10.1039/c4cp03080j
Abstract
Optical properties of metal oxide nanoparticles are subject to synthesis related defects and impurities. Using photoluminescence spectroscopy and UV diffuse reflectance in conjunction with Auger electron spectroscopic surface analysis we investigated the effect of surface composition and oxygen adsorption on the photoluminescence properties of vapor phase grown ZnO and MgO nanoparticles. On hydroxylated MgO nanoparticles as a reference system, intense photoluminescence features exclusively originate from surface excitons, the radiative deactivation of which results in collisional quenching in an O2 atmosphere. Conversely, on as-prepared ZnO nanoparticles a broad yellow emission feature centered at h\textgreeknEm = 2.1 eV exhibits an O2 induced intensity increase. Attributed to oxygen interstitials as recombination centers this enhancement effect originates from adsorbate-induced band bending, which is pertinent to the photoluminescence active region of the nanoparticles. Annealing induced trends in the optical properties of the two prototypical metal oxide nanoparticle systems, ZnO and MgO, are explained by changes in the surface composition and underline that particle surface and interface changes that result from handling and processing of nanoparticles critically affect luminescence.
Authors with CRIS profile
Amirreza Gheisi
Professur für Katalyse
Chris Neygandhi
Lehrstuhl für Feststoff- und Grenzflächenverfahrenstechnik
Andreas Sternig
Professur für Partikelsynthese
Hubertus Marbach
Lehrstuhl für Physikalische Chemie II
Additional Organisation(s)
Involved external institutions
Austria (AT)How to cite
APA:
Gheisi, A., Neygandhi, C., Sternig, A., Carrasco, E., Marbach, H., Thomele, D., & Diwald, O. (2014). O2 adsorption dependent photoluminescence emission from metal oxide nanoparticles. Physical Chemistry Chemical Physics, 16(43), 23922-23929. https://dx.doi.org/10.1039/c4cp03080j
MLA:
Gheisi, Amirreza, et al. "O2 adsorption dependent photoluminescence emission from metal oxide nanoparticles." Physical Chemistry Chemical Physics 16.43 (2014): 23922-23929.
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