Volume 122, Number 4, May 2018
|Number of page(s)||5|
|Section||Condensed Matter: Structural, Mechanical and Thermal Properties|
|Published online||27 June 2018|
High intrinsic dissipation of graphyne nanotubes
State Key Lab of Digital Manufacturing Equipment and Technology, School of Mechanical Science and Engineering, Huazhong University of Science and Technology - Wuhan 430074, China
Received: 16 November 2017
Accepted: 8 June 2018
We utilize molecular-dynamics simulations to report the first investigation of energy dissipation of two different doubly clamped graphyne nanotubes (GNTs), where the point of emphasis is to compare their dissipation characteristics with those of carbon nanotube (CNT). The obtained results demonstrate that: (a) GNTs exhibit significantly higher energy dissipation, and thus lower quality (Q) factor which is generally five times lower than that of CNT; (b) the Q factor of GNT further reduces with the increasing percentage of acetylenic linkages, which originates from the larger vibrational mismatch between the acetylenic linkage (sp C-C bonds) and the hexagonal ring (sp2 C-C bonds); (c) the application of tensile strain is found to be highly beneficial to improving the Q factor of GNTs, especially for those with higher percentage of acetylenic linkages. These findings enable a first insight into the damping behavior of GNTs and also offer a significant guideline for the future design of GNT-based devices.
PACS: 63.22.Gh – Nanotubes and nanowires / 62.25.Fg – High-frequency properties, responses to resonant or transient (time-dependent) fields / 62.25.Jk – Mechanical modes of vibration
© EPLA, 2018
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