1. Interaction of hydrogen with ZnO nanopowders—evidence of hydroxyl group formation
- Author
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Kester W J Wong, Michelle J. S. Spencer, Matthew R. Field, Jian Zhen Ou, Kay Latham, Kourosh Kalantar-zadeh, and Irene Yarovsky
- Subjects
Diffraction ,Materials science ,Spectrophotometry, Infrared ,Hydrogen ,Analytical chemistry ,chemistry.chemical_element ,Infrared spectroscopy ,Bioengineering ,Spectrum Analysis, Raman ,symbols.namesake ,Crystallinity ,X-Ray Diffraction ,Group (periodic table) ,General Materials Science ,Electrical and Electronic Engineering ,Thin film ,Hydroxyl Radical ,Mechanical Engineering ,General Chemistry ,Nanostructures ,chemistry ,Mechanics of Materials ,symbols ,Physical chemistry ,Zinc Oxide ,Crystallization ,Raman spectroscopy - Abstract
There have been many investigations to reveal the nature of the hydrogen gas and ZnO nanopowder interaction at elevated temperatures, while at present no conclusive description of such an interaction has been confidently reported. In this work, we demonstrate that a hydroxyl group is formed during this interaction, depending on size and relative crystallinity of nanopowders. Our in situ Raman spectroscopy investigations show that the interaction directly affects the intensity of the Raman signal at 483 cm(-1), relative to the peak at 519 cm(-1). Ex situ x-ray diffraction (XRD) and infrared spectroscopy also show extra peaks at 44° and 1618 cm(-1), respectively, after hydrogenation. These peaks were all identified as surface hydroxyl groups, which can be related to the formation of water on the ZnO nanopowder surfaces.
- Published
- 2011