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17 results on '"Masarapu, Charan"'

16. In-SituFormation of Sandwiched Structures of Nanotube/CuxOy/Cu Composites for Lithium Battery Applications

Author

Venkatachalam, Subramanian, Zhu, Hongwei, Masarapu, Charan, Hung, KaiHsuan, Liu, Z., Suenaga, K., and Wei, Bingqing

Abstract

Development of materials and structures leading to lithium ion batteries with high energy and power density is a major requirement for catering to the power needs of present day electronic industry. Here, we report an in situformation of a sandwiched structure involving single-walled carbon nanotube film, copper oxide, and copper during the direct synthesis of nanotube macrofilms over copper foils and their electrochemical performance in lithium ion batteries. The sandwiched structure showed a remarkably high reversible capacity of 220 mAh/g at a high cycling current of 18.6 A/g (50 C), leading to a significantly improved electrochemical performance which is extremely high compared to pure carbon nanotube and any other carbon based materials.

Published
2009
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17. Super-small energy gaps of single-walled carbon nanotube strands.

Author

Hongwei Zhu, Guang-Lin Zhao, Masarapu, Charan, Young, David P., and Bingqing Wei

Subjects
TEMPERATURE, CARBON, NANOTUBES, FULLERENES, INVESTIGATIONS, LIGHT elements
Abstract

The temperature dependence of the resistance measured on long single-walled carbon nanotube (SWNT) strands has been investigated. By applying a simple model to the detailed analysis of our experimental results, we discovered a super-small energy gap of 1–3 meV, which is an intrinsic property of the “metallic” SWNT bundles in long SWNT strands. [ABSTRACT FROM AUTHOR]

Published
2005
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