Approaching the ideal elastic strain limit in silicon nanowires

Zhang, Hongti; Tersoff, J.; Xu, Shenglong; Chen, Huixin; Zhang, Qiaobao; Zhang, Kaili; Yang, Yong; Lee, Chun‐Sing; Tu, King‐Ning; Li, Ju; Lü, Yang

doi:10.1126/sciadv.1501382

Cited by 200 publications

(143 citation statements)

References 56 publications

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“…No hardening phenomenon is observed after it yields. The fracture stress is the same as the yield stress (14.25 GPa) which is also consistent with the experimental value (~20 GPa) [29]. However, as the KSiNWs are more spring-like, their fracture strain increases 35.58 to 0.141%, and a small hardening is observed after it yields.…”

Section: Resultssupporting

confidence: 87%

Effects of Defects on the Mechanical Properties of Kinked Silicon Nanowires

Chen

Zhang

et al. 2017

Nanoscale Res Lett

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Kinked silicon nanowires (KSiNWs) have many special properties that make them attractive for a number of applications. The mechanical properties of KSiNWs play important roles in the performance of sensors. In this work, the effects of defects on the mechanical properties of KSiNWs are studied using molecular dynamics simulations and indirectly validated by experiments. It is found that kinks are weak points in the nanowire (NW) because of inharmonious deformation, resulting in a smaller elastic modulus than that of straight NWs. In addition, surface defects have more significant effects on the mechanical properties of KSiNWs than internal defects. The effects of the width or the diameter of the defects are larger than those of the length of the defects. Overall, the elastic modulus of KSiNWs is not sensitive to defects; therefore, KSiNWs have a great potential as strain or stress sensors in special applications.Electronic supplementary materialThe online version of this article (doi:10.1186/s11671-017-1970-7) contains supplementary material, which is available to authorized users.

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Section: Resultssupporting

confidence: 87%

Effects of Defects on the Mechanical Properties of Kinked Silicon Nanowires

Chen

Zhang

et al. 2017

Nanoscale Res Lett

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“…Comparison of the present data with the previous reports on different materials (Au, Ag, Cu, Al, Pt, and W nanowires, CNTs, BNNTs, and SiNW) in terms of elastic moduli and electrical resistivities at room temperature (different characteristic regions are marked).…”

supporting

confidence: 69%

Tunable Mechanical and Electrical Properties of Coaxial BN‐C Nanotubes

Zhou

Hsia

Tang

et al. 2018

Physica Rapid Research Ltrs

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Heterostructures provide a great chance to tune the properties and functions of a nanomaterial, e.g., its mechanical and electrical properties, and thus allowing for the design and realization of novel nanoelectromechanical devices. Boron nitride and carbon nanotubes, with similar structure and mechanical properties but dramatically different electrical properties, are ideal candidates for investigating nanoscale heterostructured materials. In this work, graphitic C‐coated BN nanotubes (BN‐C NTs) were synthesized and their mechanical and electrical properties were simultaneously measured using in situ high‐resolution transmission electron microscopy (TEM). As a function of the coated carbon content, the elastic modulus obtained from second order harmonic resonance of heterostructured nanotubes could be tuned from ∼140 to ∼700 GPa, and their electrical resistivity could be adjusted within three orders of magnitude from ∼0.16 to ∼2.5×10−4 Ω · m. This work opens the way for making custom‐designed heterostructures for the requirements of specific applications.

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“…MD simulations based on different interatomic potential models showed that the elastic stain of Si NWs was greater than 15% 185. Experimental measurements showed different elastic strains for Si NWs, such as 16% from the in situ TEM tensile test,217 12% from the in situ SEM tensile test,86 1.5% from the in situ SEM bending test,231 ≈5% from the nanoindentation31 and AFM bending tests,22, 31 and 4.6% and 14.7% from the respective in situ TEM tensile and bending tests 101. For SiC NWs, a maximum elastic stain of 10% was observed in an early AFM‐bending test 15.…”

Section: Mechanical Characterization Of Nwsmentioning

confidence: 99%

The Mechanical Properties of Nanowires

2017

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Applications of nanowires into future generation nanodevices require a complete understanding of the mechanical properties of the nanowires. A great research effort has been made in the past two decades to understand the deformation physics and mechanical behaviors of nanowires, and to interpret the discrepancies between experimental measurements and theoretical predictions. This review focused on the characterization and understanding of the mechanical properties of nanowires, including elasticity, plasticity, anelasticity and strength. As the results from the previous literature in this area appear inconsistent, a critical evaluation of the characterization techniques and methodologies were presented. In particular, the size effects of nanowires on the mechanical properties and their deformation mechanisms were discussed.

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Approaching the ideal elastic strain limit in silicon nanowires

Abstract: Single-crystalline silicon nanowires can be reversibly stretched above 10% elastic strain at room temperature.

Cited by 200 publications

References 56 publications

Effects of Defects on the Mechanical Properties of Kinked Silicon Nanowires

Effects of Defects on the Mechanical Properties of Kinked Silicon Nanowires

Tunable Mechanical and Electrical Properties of Coaxial BN‐C Nanotubes

The Mechanical Properties of Nanowires

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