Mechanical responses of single-crystal ZnO

Jian, Sheng-Rui

doi:10.1016/j.jallcom.2009.11.142

Cited by 17 publications

(6 citation statements)

References 31 publications

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“…Therefore, it is clear that not only the first pop-in event may reflect the onset of plasticity as described in the previous paragraphs, but even with much higher maximum applied loading the deformation behaviors in the present GaN/AlN multilayers are still dominated by pressure-induced nucleation and propagation of dislocations. This is in fact quite consistent with what were observed in many materials with hexagonal structures such as sapphire, 27 GaN films [19][20] and single crystal ZnO 24 and is in contrast to the cubic structured InP and GaAs, 28 in that only single pop-in event signifying the onset of plasticity was observed. As mentioned previously, the multiple slipping systems inherent to the hexagonal structured materials are believed to be the primary reason giving rise to the multiple pop-ins characteristics.…”

Section: Resultssupporting

confidence: 90%

Nanoindentation-Induced Structural Deformation in GaN/AlN Multilayers

Juang¹,

Chen²,

Jang³

et al. 2010

Nanosci Nanotechnol Lett

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The mechanical responses of GaN/AlN multilayers grown on Si(111) substrates by using the metalorganic vapor phase epitaxy (MOVPE) were investigated by combining the Berkovich nanoindentation and the cross-sectional transmission electron microscopy (XTEM) techniques. The prominent mechanical parameters such as the hardness and Young's modulus of GaN/AlN multilayers were obtained to be 21.6 ± 0.8 GPa and 285.7 ± 12.1 GPa, respectively by operating the Berkovich nanoindenter with the continuous contact stiffness measurements (CSM) mode. The structural deformation behaviors were delineated by XTEM observations taken in the vicinity regions just underneath the indenter tip. It was revealed that the "pop-ins" observed in the load-displacement curve during loading are due primarily to the activities of dislocation nucleation and propagation. There is no evidence of either phase transformation or micro-crack formation observed in XTEM images of GaN/AlN multilayers, which is consistent with no distinct "pop-out" event displayed in unloading curves.

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Section: Resultssupporting

confidence: 90%

Nanoindentation-Induced Structural Deformation in GaN/AlN Multilayers

Juang¹,

Chen²,

Jang³

et al. 2010

Nanosci Nanotechnol Lett

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“…Mechanical results are collected in Fig. 6, notice the high mechanical response of the ZnO100G2 sample, which yields mechanical values comparable to those reported by other techniques in the literature [39]. The decrement of mechanical properties observed for 3, 5 and 6 bilayers is attributed to in-homogeneity of the interfaces and the pseudo delimitative behavior promoted by the indenter.…”

Section: Nanointendation Testssupporting

confidence: 81%

Influence of ZnO/graphene nanolaminate periodicity on their structural and mechanical properties

Iatsunskyi

Baitimirova

Coy

et al. 2018

Journal of Materials Science & Technology

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Structural, electronic and mechanical properties of ZnO/Graphene (ZnO/G) nanolaminates fabricated by low temperature atomic layer deposition (ALD) and chemical vapor deposition (CVD) were investigated. We performed scanning and transmission electron microscopy (SEM/TEM), X-ray diffraction (XRD), electron energy loss spectroscopy (EELS), Raman spectroscopy, X-Ray photoelectron spectroscopy (XPS) and nanoindentation to characterize the ZnO/G nanolaminates. The main structural and mechanical parameters of ZnO/G nanolaminates were calculated. The obtained results were analyzed and interpreted taking into account mechanical interaction and charge effects occurring at the G-ZnO interface. The influence of graphene sublayers number on the mechanical behavior of the ZnO/G nanolaminates was studied. By reducing the bilayer thickness, the mechanical parameters of the films can be tuned 2 (Young's modulus 100-200 GPa, hardness 3-9 GPa). The softer response of the multilayers as compared to the single layers of ZnO and graphene was attributed to the structural changes in the ZnO layer and the interfaces. This study shows the mechanical behavior of ZnO/G nanolaminates and their influence on the development of novel electro-optical devices based on these structures.

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“…The multiple "pop-ins" have been reported previously in hexagonal structured sapphire [19], GaN thin films [20][21] and single crystal bulk ZnO [22], while for materials like GaAs and InP with the cubic structure only single "pop-in" event was found [23]. However, different from the spherical tip used in Ref.…”

Section: Xtem Observations In Indented Hmo Thin Filmmentioning

confidence: 77%