Wall-thickness-dependent strength of nanotubular ZnO

Title
Wall-thickness-dependent strength of nanotubular ZnO
Authors
김성근Na-Ri KangYoung-Cheon KimHansol JeonJae-il JangHeung Nam HanJu-Young Kim
Keywords
ZnO; mechanical properties
Issue Date
2017-06
Publisher
Scientific Reports
Citation
VOL 7-4327-10
Abstract
We fabricate nanotubular ZnO with wall thickness of 45, 92, 123 nm using nanoporous gold (np-Au) with ligament diameter at necks of 1.43 μm as sacrificial template. Through micro-tensile and microcompressive testing of nanotubular ZnO structures, we find that the exponent m in   m, where ¯ is the relative strength and ¯ is the relative density, for tension is 1.09 and for compression is 0.63. Both exponents are lower than the value of 1.5 in the Gibson-Ashby model that describes the relation between relative strength and relative density where the strength of constituent material is independent of external size, which indicates that strength of constituent ZnO increases as wall thickness decreases. We find, based on hole-nanoindentation and glazing incidence X-ray diffraction, that this wall-thickness-dependent strength of nanotubular ZnO is not caused by strengthening of constituent ZnO by size reduction at the nanoscale. Finite element analysis suggests that the wallthickness-dependent strength of nanotubular ZnO originates from nanotubular structures formed on ligaments of np-Au.
URI
http://pubs.kist.re.kr/handle/201004/65930
ISSN
2045-2322
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KIST Publication > Article
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