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Nano Research

Article Title

Effects of uniaxial compressive strain on the electronic-transport properties of zigzag carbon nanotubes

Keywords

carbon nanotube, strain, buckling deformation, Green’s function method, electronic-transportproperty

Abstract

Recently, substantial attention has been paid to the strain sensitivity of thecarbon nanotubes’ (CNTs’) electronic properties. In this study, the relationshipsbetween the geometric structures and electronic states of zigzag CNTs underuniaxial compressive strain were investigated. We found that different factorsdominate the electronic states of zigzag CNTs depending on the strain regions: theinitial stage of the strain loading, which lasts until column-buckling deformationbegins, and the strain regions corresponding to column- and shell-bucklingdeformations. Because shell-buckling deformation significantly increases theπ-orbital angle, the angle between the π orbital axis vectors of adjacent atoms,strong localization of the density of states (LDOS) occurs in the buckled area.We also analyzed the current able to pass through deformed CNTs using atight-binding-based Green’s function approach and determined that the currentcan be significantly suppressed by applying uniaxial compressive strain. Ourmethod of predicting the electronic state of a deformed CNT based on theπ-orbital angle is expected to be useful for predicting the electronic propertiesof CNT-based electronic devices and sensors.

Graphical Abstract

Publisher

Tsinghua University Press

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