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Mechanical properties of nickel-coated single-walled carbon nanotubes and their embedded gold matrix composites
Authors:Hai-Yang Song  Xin-Wei Zha
Institution:Department of Applied Mathematics and Physics, Xi'an Institute of Posts and Telecommunications, Xi'an 710121, China
Abstract:The effects of nickel coating on the mechanical behaviors of armchair single-walled carbon nanotubes (SWCNTs) and their embedded gold matrix composites under axial tension are investigated using molecular dynamics (MD) simulation method. The results show that the Young's moduli and tensile strength of SWCNTs obviously decrease after nickel coating. For armchair SWCNTs, the decreased ratio of the Young's moduli of SWCNTs with smaller radius is larger than that of SWCNTs with larger radius. A comparison is made between the response to Young's modulus of a composite with parallel embedded nanotube and the response of a composite with vertically embedded nanotube. The results show that the uncoated SWCNT can enhance the Young's modulus of composite under the condition of parallel embedment, but such improvement disappears under the condition of vertical embedment because the interaction between SWCNT and gold matrix is too weak for effective load transfer. However, the nickel-coated SWCNT can indeed significantly improve the composite behavior.
Keywords:Nanocomposites  Mechanical properties  Carbon nanotubes  Molecular dynamics simulation
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