Kang, Na-Ri Kim, Young-Cheon Jeon, Hansol Kim, Seong Keun Jang, Jae-il Han, Heung Nam Kim, Ju-Young 2024-01-20T01:04:14Z 2024-01-20T01:04:14Z 2021-09-04 2017-06-28 2045-2322 https://pubs.kist.re.kr/handle/201004/122610 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. English NATURE PUBLISHING GROUP NANOPOROUS GOLD ELASTIC PROPERTIES ULTRA-STRONG NANOSTRUCTURES EVOLUTION BEHAVIOR TENSILE ENERGY FILMS Wall-thickness-dependent strength of nanotubular ZnO Article 10.1038/s41598-017-04696-4 1 SCIENTIFIC REPORTS, v.7 SCIENTIFIC REPORTS 7 scie scopus 000404268900015 2-s2.0-85021672025 Multidisciplinary Sciences Science & Technology - Other Topics Article NANOPOROUS GOLD ELASTIC PROPERTIES ULTRA-STRONG NANOSTRUCTURES EVOLUTION BEHAVIOR TENSILE ENERGY FILMS ZnO mechanical properties