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Wall-thickness-dependent strength of nanotubular ZnO

Title
Wall-thickness-dependent strength of nanotubular ZnO
Author
장재일
Keywords
NANOPOROUS GOLD; ELASTIC PROPERTIES; ULTRA-STRONG; NANOSTRUCTURES; EVOLUTION; BEHAVIOR; TENSILE; ENERGY; FILMS
Issue Date
2017-06
Publisher
NATURE PUBLISHING GROUP
Citation
SCIENTIFIC REPORTS, v. 7, Article no. 4327
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 mu m as sacrificial template. Through micro-tensile and micro-compressive testing of nanotubular ZnO structures, we find that the exponent m in (sigma) over bar proportional to (rho) over bar (m), where (sigma) over bar is the relative strength and (rho) over bar 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 wall-thickness-dependent strength of nanotubular ZnO originates from nanotubular structures formed on ligaments of np-Au.
URI
https://www.nature.com/articles/s41598-017-04696-4https://repository.hanyang.ac.kr/handle/20.500.11754/114362
ISSN
2045-2322
DOI
10.1038/s41598-017-04696-4
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MATERIALS SCIENCE AND ENGINEERING(신소재공학부) > Articles
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