Changing interfaces: Photoluminescent ZnO nanoparticle powders in different aqueous environments.

ABSTRACT: We transformed vapor phase grown ZnO nanoparticle powders into aqueous ZnO nanoparticle dispersions and studied the impact of associated microstructure and interface property changes on their spectroscopic properties. With photoluminescence (PL) spectroscopy, we probed oxygen interstitials Oi2- in the near surface region and tracked their specific PL emission response at hv_EM = 2.1 eV during the controlled conversion of the solid-vacuum into the solid-liquid interface. While oxygen adsorption via the gas phase does affect the intensity of the PL emission bands, the O₂ contact with ZnO nanoparticles across the solid-liquid interface does not. Moreover, we found that the near band edge emission feature at hv_EM = 3.2 eV gains relative intensity with regard to

SUBMITTER: Kocsis K 

PROVIDER: S-EPMC7116034 | biostudies-literature | 2016 Oct

REPOSITORIES: biostudies-literature