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Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2013

Role of temperature in the formation and growth of gold monoatomic chains: A molecular dynamics study

Résumé

The effect of temperature on the formation and growth of monoatomic chains is investigated by extensive molecular dynamics simulations using a semiempirical potential based on the second-moment approximation to the tight-binding Hamiltonian. Gold nanowires, with an aspect ratio of similar to 13 and a cross section of similar to 1 nm(2), are stretched at a rate of 3 m/s in the range of temperatures 5-600 K with 50 initial configurations per temperature. A detailed study on the probability to form monoatomic chains (MACs) is presented. Two domains are apparent in our simulations: one at T < 100 K, where MACs develop from crystalline disorder at the constriction, and the other at T > 100 K, where MACs form as a consequence of plastic deformation of the nanowire. Our results show that the average length of the formed MACs maximizes at T = 150 K, which is supported by simple energy arguments.

Dates et versions

hal-01243108 , version 1 (14-12-2015)

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R. Cortes-Huerto, T. Sondon, A. Saul. Role of temperature in the formation and growth of gold monoatomic chains: A molecular dynamics study. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2013, 88 (23), pp.235438. ⟨10.1103/PhysRevB.88.235438⟩. ⟨hal-01243108⟩
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