Influence of Defect Number, Distribution Continuity and Orientation on Tensile Strengths of the CNT-Based Networks: A Molecular Dynamics Study

Shi, Xian1; He, Xiaoqiao2,3; Sun, Ligang4; Liu, Xuefeng5

2022-01-15

10.1186/s11671-022-03656-w

Nanoscale Research Letters   影响因子和分区

1931-7573

1556-276X

Networks based on carbon nanotube (CNT) have been widely utilized to fabricate flexible electronic devices, but defects inevitably exist in these structures. In this study, we investigate the influence of the CNT-unit defects on the mechanical properties of a honeycomb CNT-based network, super carbon nanotube (SCNT), through molecular dynamics simulations. Results show that tensile strengths of the defective SCNTs are affected by the defect number, distribution continuity and orientation. Single-defect brings 0 similar to 25% reduction of the tensile strength with the dependency on defect position and the reduction is over 50% when the defect number increases to three. The distribution continuity induces up to 20% differences of tensile strengths for SCNTs with the same defect number. A smaller arranging angle of defects to the tensile direction leads to a higher tensile strength. Defective SCNTs possess various modes of stress concentration with different concentration degrees under the combined effect of defect number, arranging direction and continuity, for which the underlying mechanism can be explained by the effective crack length of the fracture mechanics. Fundamentally, the force transmission mode of the SCNT controls the influence of defects and the cases that breaking more force transmission paths cause larger decreases of tensile strengths. Defects are non-negligible factors of the mechanical properties of CNT-based networks and understanding the influence of defects on CNT-based networks is valuable to achieve the proper design of CNT-based electronic devices with better performances.

CNT-based network Molecular dynamics simulation Influence of defect Mechanical performance

SCI ; EI

英语

其他

National Natural Science Foundation of China[52108237] ; Suzhou University of Science and Technology Research Project for the introducing talents[332011102] ; Science and Technology Innovation Commission of Shenzhen Municipality[JCYJ20190808175607486]

Science & Technology - Other Topics ; Materials Science ; Physics

Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Physics, Applied

WOS:000743336500003

SPRINGER

20220411493751

Carbon nanotubes ; Defects ; Fracture mechanics ; Molecular orientation ; Tensile strength ; Thermoelectric equipment

Thermoelectric Energy:615.4 ; Nanotechnology:761 ; Physical Chemistry:801.4 ; Mechanics:931.1 ; Crystalline Solids:933.1 ; Electronic Structure of Solids:933.3 ; Materials Science:951

Web of Science

1.Suzhou Univ Sci & Technol, Sch Civil Engn, Suzhou 215009, Peoples R China
2.City Univ Hong Kong, Dept Architecture & Civil Engn, Kowloon Tong, Tat Chee Ave, Hong Kong 999077, Peoples R China
3.City Univ Hong Kong, Ctr Adv Struct Mat, Shenzhen Res Inst, Shenzhen 518057, Peoples R China
4.Harbin Inst Technol, Sch Sci, Shenzhen 518055, Peoples R China
5.Southern Univ Sci & Technol, Dept Mech & Aerosp Engn, Shenzhen 518055, Peoples R China

Shi, Xian,He, Xiaoqiao,Sun, Ligang,et al. Influence of Defect Number, Distribution Continuity and Orientation on Tensile Strengths of the CNT-Based Networks: A Molecular Dynamics Study[J]. Nanoscale Research Letters,2022,17(1).

Shi, Xian,He, Xiaoqiao,Sun, Ligang,&Liu, Xuefeng.(2022).Influence of Defect Number, Distribution Continuity and Orientation on Tensile Strengths of the CNT-Based Networks: A Molecular Dynamics Study.Nanoscale Research Letters,17(1).

Shi, Xian,et al."Influence of Defect Number, Distribution Continuity and Orientation on Tensile Strengths of the CNT-Based Networks: A Molecular Dynamics Study".Nanoscale Research Letters 17.1(2022).