Wall-thickness-dependent strength of nanotubular ZnO

Collection with item attached
2017
Item details URL
http://open-repository.kisti.re.kr/cube/handle/open_repository/486957.do
DOI
10.1038/s41598-017-04696-4
Title
Wall-thickness-dependent strength of nanotubular ZnO
Description
This work was supported by the National Research Foundation of Korea(NRF) grant funded by the Ministry of Science, ICT & Future Planning(MSIP) (NO. NRF-2015R1A15A1037627), by the KIST-UNIST partnershipprogram (1.160097.01/2.160482.01), and by the Global Frontier R&DProgram on Center for Multiscale Energy System funded by the NationalResearch Foundation under the Ministry of Science, ICT & FuturePlanning, Korea (2012M3A6A7054855).
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.
provenance
Made available in Cube on 2018-09-28T16:21:27Z (GMT). No. of bitstreams: 0
language
English
author
Kang, Na-Ri
Kim, Young-Cheon
Jeon, Hansol
Kim, Seong Keun
Jang, Jae-il
Han, Heung Nam
Kim, Ju-Young
orcid
Kim, Seong Keun/0000-0001-8712-7167; Han, Heung Nam/0000-0001-5271-9023;
Jang, Jae-il/0000-0003-4526-5355
accessioned
2018-09-28T16:21:27Z
available
2018-09-28T16:21:27Z
issued
2017
citation
SCIENTIFIC REPORTS(7)
issn
2045-2322
uri
http://open-repository.kisti.re.kr/cube/handle/open_repository/486957.do
Funder
과학기술정보통신부
Funding Program
울산과학기술원연구운영비지원(0.5)
Project ID
1711063307
Jurisdiction
Rep.of Korea
Project Name
미래선도형특성화사업
rights
openAccess
type
article


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