Anelasticity of twinned CuO nanowires

Sheng, Huaping; He, Zheng; Cao, Fan; Wu, Sung‐Mao; Li, Lei; Liu, Chun; Zhao, Dan; Wang, Jianbo

doi:10.1007/s12274-015-0868-x

Cited by 29 publications

(34 citation statements)

References 37 publications

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“…Figure a is a pristine CuO−Pt NW with a total diameter of ∼32 nm (the diameter of CuO‐core NW is estimated to be 20 nm excluding 12 nm Pt‐shell) and Figure b is the corresponding enlarged view from the dashed white box. The NW can be bent to a maximum strain of 11.34% (Figure c), much higher than the results of uncoated CuO NWs (6.18%), which could be attributed to the protection of Pt‐shell . The strain of the CuO‐core is obtained based on the formula ϵ = D /2 ρ , where D denotes the diameter of the NW and ρ represents the curvature radius .…”

Section: Resultsmentioning

confidence: 90%

“…The NW can be bent to a maximum strain of 11.34% (Figure c), much higher than the results of uncoated CuO NWs (6.18%), which could be attributed to the protection of Pt‐shell . The strain of the CuO‐core is obtained based on the formula ϵ = D /2 ρ , where D denotes the diameter of the NW and ρ represents the curvature radius . Subsequently, the W tip was retracted as fast as possible to guarantee free recovery of the NW (see Movie 1 in the SI), and there exists a much higher residual strain (3.94%, as presented in Figure d and the corresponding enlarged view in Figure e) compared with that of CuO NW (0.51%) with similar diameter (17 nm) .…”

Section: Resultsmentioning

confidence: 99%

“…Then the bending process was performed inside the TEM via the in situ technique as described in our previous work ,. Figure a is a pristine CuO−Pt NW with a total diameter of ∼32 nm (the diameter of CuO‐core NW is estimated to be 20 nm excluding 12 nm Pt‐shell) and Figure b is the corresponding enlarged view from the dashed white box.…”

Section: Resultsmentioning

confidence: 99%

“…The strain of the CuO‐core is obtained based on the formula ϵ = D /2 ρ , where D denotes the diameter of the NW and ρ represents the curvature radius . Subsequently, the W tip was retracted as fast as possible to guarantee free recovery of the NW (see Movie 1 in the SI), and there exists a much higher residual strain (3.94%, as presented in Figure d and the corresponding enlarged view in Figure e) compared with that of CuO NW (0.51%) with similar diameter (17 nm) . Moreover, in contrast to the fast shape restoration of uncoated CuO NWs, the NW nearly maintains its shape after 10 min (Figure f), implying a plastic behavior in current situation.…”

Section: Resultsmentioning

confidence: 99%

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Controllable Elasticity Storage and Release in CuO−Pt Core‐Shell Nanowires

Cao

et al. 2018

ChemNanoMat

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One‐dimensional (1D) core‐shell heterostructures can exhibit novel and flexible properties when two different materials are combined. In this work, Pt nanoparticles are directly deposited onto CuO nanowires (NWs), forming 1D CuO−Pt core‐shell heterostructures with elastic and plastic behaviors dominating in the CuO‐core and Pt‐shell, respectively, under bending deformation. Interestingly, the plastically deformed Pt‐shell leads to a delayed or even terminated elasticity restoration of the CuO‐core NWs after unloading. Moreover, the release of the elasticity in CuO NW can be easily regulated not only via controlling the diameter of the CuO−Pt NWs, but also by thermal heating. The result shows a flexible 1D nanostructure with potential applications in micro/nano electro‐mechanical systems, such as mechanical energy storage and thermal sensors.

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Section: Resultsmentioning

confidence: 90%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Controllable Elasticity Storage and Release in CuO−Pt Core‐Shell Nanowires

Cao

et al. 2018

ChemNanoMat

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“…[35] A study conducted by Huaping et al also concluded that the magnitude of anelasticity is highly dependent on the diameter metal nanowires as thicker surface amorphous layer would result in a higher driving force compared to that of a thinner one. [18] The largest room for error would be the measuring of the deflection of and dimensions of the nanowire. For the deflections, pixel distances would be the contribution.…”

Section: Figure 30: Experiments Conducted By Nc State University [35]mentioning

confidence: 99%

The friction between nanowires and highly oriented pyrolytic graphite

Leong¹

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the opportunity to take up one of his Nanotechnology projects as a thesis student.Next I would express my deepest appreciation to Dr Shiliang Wang for his continuous support and guidance through the course of this thesis. Though he is always busy with his own work, he would find time for meetings to discuss matters regarding the experiments. I am also thankful for the help he provided with the manipulation of nanowires under the Micro System Analyser and processing of images under the Scanning Electron Microscope. His accumulated experience and steady hands ensured the experiments were completed smoothly. AbstractThe study of friction has been on-going from centuries ago till date yet the fundamental relations between macro-, micro-and nano-scale friction have not been fully grasped. Friction is present in everyday and everywhere, from engineering systems to geophysical occurrences around the world. In the world of engineering friction plays two extremely different roles. On one had you have friction forces that are beneficial for example the traction of automobile tires and on the other u have detrimental effects of friction like wear and tear.This study investigates the effects of friction on a nanoscale by studying the effects of friction between nanowires and substrates. This study aims to bridge the gap between nanoscale friction and macroscale friction. Currently, results showed that the frictional forces calculated tend towards a common idea that local asperities on both substrate and nanowires are the key causes of friction. There is also an argument that plastic deformation of the local asperities would contributed to the frictional forces occurring in two surfaces.Further research is recommended to access the actual cause of friction and its origin. In order to attain these results, the experiments will have to be repeated across different types of nanowires and substrates and hopefully a conclusion can be drawn when the results are compared to each other.

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Coating‐Mediated Nanomechanical Behaviors of CuO Electrodes in Li‐ and Na‐Ion Batteries

Liu

et al. 2020

Adv Materials Inter

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Surface coating strategy has been proved essential for mitigating the large volume change in the electrodes for lithium‐ion batteries (LIBs) and sodium‐ion batteries (SIBs), thus improving the cyclability and working efficiency of batteries. However, the mechanical instability of electrode generated by incorporating heterostructure interface between the coating and core materials remains largely unexplored. Here, the effects of carbon and gold coatings on the nanomechanical properties of CuO nanowires (NWs) are investigated based on the in situ experiments during the electrochemical reactions. It is found that the NW deformability is mediated by the coating materials as well as the reaction speed. Besides, the inhomogeneity between coating and core materials can promote the crack propagation in the lithiated/sodiated CuO/C NWs and sodiated CuO/Au NWs. Further study indicates that the namomechanical behaviors also depend on the different reaction stages, e.g., lithiation/sodiation or delithiation/desodiation. This work serves as a guidance for building better ion batteries not only with improved electrochemical properties but enhanced mechanical stabilities.

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Anelasticity of twinned CuO nanowires

Cited by 29 publications

References 37 publications

Controllable Elasticity Storage and Release in CuO−Pt Core‐Shell Nanowires

Controllable Elasticity Storage and Release in CuO−Pt Core‐Shell Nanowires

The friction between nanowires and highly oriented pyrolytic graphite

Coating‐Mediated Nanomechanical Behaviors of CuO Electrodes in Li‐ and Na‐Ion Batteries

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