Discrete plasticity in sub-10-nm-sized gold crystals

He, Zheng; Cao, Ajing; Weinberger, Christopher R.; Huang, Jianyu; Du, Kui; Wang, Jianbo; Ma, Yanyun; Xia, Younan; Mao, Scott X.

doi:10.1038/ncomms1149

Cited by 310 publications

(297 citation statements)

References 37 publications

(75 reference statements)

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“…[44][45][46] But recent experiments and simulations suggested that in single-crystalline nanopillars or NWs (with diameters typically less than ~200 nm), dislocations are relatively easily annihilated at free surfaces before they have the opportunity to interact (e.g., the gliding dislocations travel only very short distances before annihilating at a free surface), leading to no strain hardening. 24,[47][48][49] Nevertheless, our results clearly show the strain hardening in five-fold twinned Ag NWs (Figure 2a). MD simulations of five-fold twinned NWs predicted that partial dislocations are nucleated from surfaces and glide towards the NW center following a {111}/<112> slip system.…”

Section: Resultsmentioning

confidence: 82%

Size effects on elasticity, yielding, and fracture of silver nanowires:In situexperiments

et al. 2012

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This paper reports the first quantitative measurement of a full spectrum of mechanical properties of five-fold twinned silver (Ag) nanowires (NWs) including Young's modulus, yield strength and ultimate tensile strength. In situ tensile testing of Ag NWs with diameters between 34 and 130 nm was carried out inside a scanning electron microscope (SEM). Young's modulus, yield strength and ultimate tensile strength all increased as the NW diameter decreased. The maximum yield strength in our tests was found to be 2.64 GPa, which is about 50 times the bulk value and close to the theoretical value of Ag in the <110> orientation. The size effect in the yield strength is attributed to the increase in the Young's modulus. Yield strain scales reasonably well with the NW surface area, which reveals that yielding of Ag NWs is due to dislocation nucleation from surface sources. Pronounced strain hardening was observed for most NWs in our study. The strain hardening, which has not previously been reported for NWs, is mainly attributed to the presence of internal twin boundaries. KEYWORDSfive-fold twin, size effect, Young's modulus, yield strength, ultimate tensile strength, strain hardening

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Section: Resultsmentioning

confidence: 82%

Size effects on elasticity, yielding, and fracture of silver nanowires:In situexperiments

et al. 2012

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“…W elding and sintering of various metal nanoparticles (NPs) were intensively investigated during the last decade [1][2][3][4][5][6] . The main driving force for that research is the challenge to form electrical contacts between nanoscale metal particles in nanoelectronic devices and nanoelectromechanical systems, particularly in printed electronics 7,8 .…”

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confidence: 99%

Merging of metal nanoparticles driven by selective wettability of silver nanostructures

et al. 2014

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The welding and sintering of nanomaterials is relevant, for example, to form electrical contacts between metallic particles in printed electronic devices. Usually the welding of nanoparticles is achieved at high temperatures. Here we find that merging of two different metals, silver and gold nanoparticles, occurs on contact at room temperature. The merging process was investigated by experimental and molecular dynamics simulations. We discovered that the merging of these particles is driven by selective wettability of silver nanoparticles, independent of their size and shape (spheres or rods); silver behaves as a soft matter, whereas gold as a hard surface being wetted and retaining its original morphology. During that process, the silver atoms move towards the surface of the Au nanoparticles and wrap the Au nanoparticles in a pulling up-like process, leading to the wetting of Au nanoparticles.

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“…The plastic deformation of the Au NWs is apparently mediated by partial dislocations. In situ TEM demonstrated that the plastic deformation of Au NWs of below 10 nm in diameter is dominated by partial dislocations emitted from the free surface,259 while the plastic deformation of Au nanocrystal of 6 and 3 nm in particle size seems to be controlled by lattice slip 260, 261. Apparently the plastic deformation patterns are influenced by the geometric size of Au NWs.…”

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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Discrete plasticity in sub-10-nm-sized gold crystals

Cited by 310 publications

References 37 publications

Size effects on elasticity, yielding, and fracture of silver nanowires:In situexperiments

Size effects on elasticity, yielding, and fracture of silver nanowires:In situexperiments

Merging of metal nanoparticles driven by selective wettability of silver nanostructures

The Mechanical Properties of Nanowires

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