Surface-induced structural transformation in nanowires

Ma, Fang; Xu, Ke; Chu, Paul K.

doi:10.1016/j.mser.2013.05.001

Cited by 25 publications

(23 citation statements)

References 201 publications

(440 reference statements)

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“…The mechanism of introducing oxygen vacancies by air annealing was discussed in detail in the previous articles. [45,46] The introduction of oxygen vacancies in the air-annealed samples can be further confirmed by EIS and UV-Vis absorbance spectra. The Nyquist arc radii of the airannealed samples are much smaller than the unannealed ones, suggesting a much better conductive (Fig.…”

Section: Structure and Morphologymentioning

confidence: 69%

Enhanced photocatalytic performance of tungsten oxide through tuning exposed facets and introducing oxygen vacancies

Tang

Zhang

et al. 2017

Journal of Alloys and Compounds

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It is known that the exposed facet and defect state are crucial to the photocatalytic performance. Here, we report that the exposed facets of the building blocks in the tungsten oxide hierarchical nanostructures could be controlled by adjusting the amount of formamide in the hydrothermal precursor solution and the oxygen vacancies were successfully introduced through the post-air annealing. It is found that exposing high percentage (020) facet is unbeneficial for the photocatalytic performance and (200) and (002) facets should be the photocatalytic active facets of the hexagonal tungsten oxide. The hexagonal tungsten oxide with oxygen vacancies and maximum (200) and (002) facets archives highest photocatalytic performance in degrading rhodamine B under simulated solar light irradiation, which the rate constant per specific surface area (k/SBET) is 7.3 times as high as the sample without oxygen vacancies and minimum (200) and (002) facets. Both introducing oxygen vacancies and exposing (200) and (002) facets can enhance the separation efficiency of photo-generated charges, thus improving the photocatalytic performance.

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Section: Structure and Morphologymentioning

confidence: 69%

Enhanced photocatalytic performance of tungsten oxide through tuning exposed facets and introducing oxygen vacancies

Tang

Zhang

et al. 2017

Journal of Alloys and Compounds

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“…After B is ascertained, it is shown that the activation energy increases with the increase of the lateral dimension of NWs (see figure 7(a)). This is not surprising since the increase of lateral dimension cuts down the cohesive energy of a material due to reduction of surface region [26]. Thus, the energy barrier between wurtzite and tetragonal structures grows as the lateral dimension of NWs increases.…”

Section: Wurtzite To Tetragonal Phase Transformationmentioning

confidence: 99%

On the wurtzite to tetragonal phase transformation in ZnO nanowires

et al. 2017

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Dynamic behaviour of silicon carbide nanowires under high and extreme strain rates: a molecular dynamics study H Tsuzuki, J P Rino and P S Branicio There is a long standing contradiction on the tensile response of zinc oxide nanowires between theoretical prediction and experimental observations. Although it is proposed that there is a ductile behavior dominated by phase transformation, only an elastic deformation and brittle fracture was witnessed in experiments. Using molecular dynamics simulations, we clarified that, as the lateral dimension of zinc oxide nanowires increases to a critical value, an unambiguous ductile-to-brittle transition occurs. The critical value increases with decreasing the strain rate. Factors including planar defects and surface contamination induce brittle fracture prior to the initiation of phase transformation. These findings are consistent with previous atomistic standpoints and experimental results.

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“…Both the phase transformation and diffusion-mediated liquid-like deformation can result in the pseudoelastic deformation in metallic nanostructures 3,33 . The reversible twinning-detwinning during cyclic loading was also observed to underlie the pseudoelastic deformation of metallic nanostructures, such as W and Ni 13,59 .…”

Section: Phase Transformation Liquid-like Behavior and Pseudoelasticitymentioning

confidence: 99%

“…Nanostructured materials possess excellent mechanical properties such as ultrahigh strength, large elastic strain limit and high deformation reversibility. They hold great promise for enabling the development of novel micro/nano electro-mechanical systems (MEMS/NEMS) [1][2][3][4][5] . The unique mechanical properties of nanostructured materials are also of technological importance for tuning their physical-chemical properties, such as band gap, electronic conductivity and catalytic performance, by the applied strain field 1,6,7 .…”

Section: Introductionmentioning

confidence: 99%

Atomistic perspective on in situ nanomechanics

Wang

Mao

2016

Extreme Mechanics Letters

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Nanostructured materials exhibit superior physical and mechanical properties, and they hold great promise for enabling the development of novel micro/nano electromechanical systems. A fundamental understanding of the mechanical deformation and degradation in nanostructured materials is critical for designing the damage-tolerant nanostructures and devices. The in situ transmission electron microscopy provides a novel approach to uncover the dynamic deformation mechanisms in nanostructured materials, especially at the atomic scale. This review presents an overview of recent progress in the atomic-scale study of mechanical properties, dynamic deformation and degradation in a variety of nanostructured materials. Experimental techniques for in situ nanomechanical testing are reviewed. New insights into the atomic-level mechanical behavior of nanostructured materials are described, including surface-mediated defect processes, size-dependent deformation mechanisms, plastic deformation of nanotwinned and nanocrystalline materials, phase transformation, liquid-like behavior and pseudoelasticity, bending and fatigue, etc. Future research on the in situ nanomechanics is also discussed. Ultimately, the in situ nanomechanics study will enable a complete understanding of the atomic-scale dynamic deformation, thereby providing a mechanistic basis of the rational design and fabrication of durable nanomaterials and nanodevices.

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Surface-induced structural transformation in nanowires

Cited by 25 publications

References 201 publications

Enhanced photocatalytic performance of tungsten oxide through tuning exposed facets and introducing oxygen vacancies

Enhanced photocatalytic performance of tungsten oxide through tuning exposed facets and introducing oxygen vacancies

On the wurtzite to tetragonal phase transformation in ZnO nanowires

Atomistic perspective on in situ nanomechanics

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