Carbon chain inserted carbon nanotubes (CNTs) have been experimentally proven having undergone pronounced property change in terms of electrical conductivity compared with pure CNTs. This paper simulates the geometry of carbon chain inserted CNTs and analyzes the mechanism for conductivity change after insertion of carbon chain. The geometric simulation of Pt doped CNT was also implemented for comparison with the inserted one. The results indicate that both modification by Pt atom on the surface of CNT and addition of carbon chain in the channel of the tube are effective methods for transforming the electrical properties of the CNT, leading to the redistribution of electron and thereby causing the conductivity change in obtained configurations. All the calculations were obtained based on density functional theory method.

Abstract
 1. Introduction
 2. Experimental
 3. Results and Discussion
 4. Conclusions
 Conflict of Interest
 Acknowledgements
 References

• Hao Cui(State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University)
• Xiaoxing Zhang(State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, School of Electrical Engineering, Wuhan University) Corresponding Author
• Hanyan Xiao(State Key Laboratory of Power Transmission Equipment & System Security and New Technology)
• Ju Tang(School of Electrical Engineering, Wuhan University)