13-19 June 2015
University of Alberta
America/Edmonton timezone
Welcome to the 2015 CAP Congress! / Bienvenue au congrès de l'ACP 2015!

You don't know what you've got 'till it's gone: ambient surface degradation of ZnO powders

16 Jun 2015, 09:15
15m
CCIS L2-190 (University of Alberta)

CCIS L2-190

University of Alberta

Oral (Non-Student) / orale (non-étudiant) Surface Science / Science des surfaces (DSS) T1-9 Nanostructured Surfaces and Thin Films (DSS-DCMMP) / Surfaces et couches minces nanostructurées (DSS-DPMCM)

Speaker

Kristin Poduska (Memorial University of Newfoundland)

Description

ZnO has rich electronic and optical properties that are influenced by surface structure and composition, which in turn are strongly affected by interactions with water and carbon dioxide. We correlated the effects of particle size, surface area, and crystal habit with data from X-ray photoelectron spectroscopy and zeta potential measurements to compare the degradation of ZnO powders prepared by several different synthesis methods. Neither surface polarity nor surface area, on their own, can account for the differences in the extent of carbonation among differently synthesized ZnO samples, and dissolution is a very significant in some samples [1]. Furthermore, ambient surface carbonation appears to be self-limiting for some ZnO powders (solvothermal synthesis), while ZnO produced by other synthesis methods (solid-state metathesis) can be completely converted to hydrozincite, Zn$_5$(OH)$_6$(CO$_3$)$_2$ in a matter of weeks. We show how these differences in surface carbonation correlate with frequency-dependent electrical properties, emphasizing the impact of ambient humidity variations. [1] J. Cheng and K.M. Poduska, ECS Journal of Solid State Science and Technology, 3 (5) P133-P137 (2014).

Primary authors

Jiaqi Cheng (Memorial University of Newfoundland) Kristin Poduska (Memorial University of Newfoundland)

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