(a)–(i) Types 1–9 of the SWCNT heterojunctions with diverse topological defects. It is noted that these structures remain the same total number of atoms. Spheres in blue represent the pentagonal and heptagonal defects.
Deformed structures of the SWCNT heterojunctions for groups I–III (a)–(c), corresponding to type 2–4, under compression processes. The left, middle, and right panels are the structure at 0% strain, first yielding, and second yielding points.
Stress distributions of the SWCNT heterojunctions for types 2–4 (a)–(c), corresponding to groups I–III on the yielding point. (d) Summarizes the bending axis of different groups of heterojunctions under buckling.
Mechanical properties of SWCNT and SWCNT heterojunctions. Y indicates the Young's modulus, and σ represents the yielding stress. Unit of Young's modulus and yielding stress is GPa.
Mechanical properties of SWCNT heterojunctions with different numbers of 5-7 pair defects. N, Y, and σ represent the number of 5 and 7 defects, Young's modulus and yielding stress. Groups I-III indicate the orientation of the two contacted heptagonal defects: vertical, tilted, and parallel to the axis direction. Unit of Young's modulus and yielding stress is GPa.
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