Functional Nanomaterials for Phototherapies of Cancer

A Review on Size‐Dependent Mechanical Properties of Nanowires

The failure of the metallic nanowire has raised concerns due to its applied reliability in nanoelectromechanical system. In this article, the breaking failure is studied for the [100], [110], and [111] single-crystal copper nanowires at different strain rates. The statistical breaking position distributions of the nanowires have been investigated to give the effects of strain rate and crystallographic orientation on micro-atomic fluctuation in the symmetric stretching of the nanowires. When the strain rate is less than 0.26% ps-1, macro-breaking position distributions exhibit the anisotropy of micro-atomic fluctuation. However, when the strain rate is larger than 3.54% ps-1, the anisotropy is not obvious because of strong symmetric shocks.

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Shock-induced breaking of the nanowire with the dependence of crystallographic orientation and strain rate.

Investigation on the most probable breaking behaviors of copper nanowires with the dependence of temperature

Defects in metallic nanowires have raised concerns about the applied reliability of the nanowires in nanoelectromechanical systems. In this paper, molecular dynamics simulations are used to study the deformation and breaking failure of the [100] single-crystal gold nanowires containing defects at different strain rates. The statistical breaking position distributions of the nanowires show mechanical shocks play a critical role in the deformation of nanowires at different strain rates, and deformation mechanism of the nanowire containing defects is based on a competition between shocks and defects in the deformation process of the nanowire. At low strain rate of 1.0% ps−1, defect ratio of 2% has changed the deformation mechanism because micro-atomic fluctuation is in an equilibrium state. However, owing to strong symmetric shocks, the sensitivity of defects is not obvious before a defect ratio of 25% at high strain rate of 5.0% ps−1.

Shock-induced breaking in the gold nanowire with the influence of defects and strain rates.

Defects in metallic nanowires have raised concerns due to the influence on the properties of metallic nanowires in a nanoelectromechanical system. In this paper, the deformation and breaking of the [100] single-crystal gold nanowires containing vacancy defects are studied using molecular dynamics simulations at different temperatures. The statistical breaking position distributions show the deformation and breaking of the nanowires have a dependence on the applied temperature, and the sensitivity of the nanowire to vacancies is based on a competition between constructed vacancies and disordered crystalline structures induced by temperatures. At a low temperature of 100 K, a vacancy ratio of 25% has decided the breaking of the nanowire because microatomic fluctuation is in an equilibrium state. However, owing to acute atomic movements, the sensitivity of vacancies to breaking is not obvious before a vacancy ratio of 70% at a high temperature of 500 K.

Uniaxial tension-induced breaking in the gold nanowire with the influence of defects and temperatures

The failure of the nanoscale metallic interface has raised concerns owing to the effect interfacial amalgamation has on its application in nanoelectronic devices. Single crystal copper [110] and [100], which are set as two components of [110]‖[100] nanocrystalline copper, are used to simulate the interfacial properties using molecular dynamics simulations. Repeated tension and compression cycles show that the two components of the interface can come into contact and separate without interfacial amalgamation. The [110]‖[100] interface could withstand momentary shocks of compression and heat produced by the momentary shocks. This property of the [110]‖[100] interface is dominated by crystalline orientations of interfacial structure, in comparison with [111]‖[100] and [111]‖[110] interfaces under the same conditions.

Tiemin Zhu

Papers

Shock-induced breaking of the nanowire with the dependence of crystallographic orientation and strain rate.

Shock-induced breaking in the gold nanowire with the influence of defects and strain rates.

Uniaxial tension-induced breaking in the gold nanowire with the influence of defects and temperatures

Nanoscale interface of metals for withstanding momentary shocks of compression.