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Interaction of hydrogen with ZnO nanopowders—evidence of hydroxyl group formation

Authors :
Kester W J Wong
Michelle J. S. Spencer
Matthew R. Field
Jian Zhen Ou
Kay Latham
Kourosh Kalantar-zadeh
Irene Yarovsky
Source :
Nanotechnology. 23:015705
Publication Year :
2011
Publisher :
IOP Publishing, 2011.

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.

Details

ISSN :
13616528 and 09574484
Volume :
23
Database :
OpenAIRE
Journal :
Nanotechnology
Accession number :
edsair.doi.dedup.....71d44be4b58c126f2c61d984f7d3536c
Full Text :
https://doi.org/10.1088/0957-4484/23/1/015705