Abstract
Bi2Te3 nanotubes covered with nanoplates have been synthesized by a single-step, surfactant assisted hydrothermal method and the effects of different reaction conditions including reaction time and temperature have been investigated. Nanotubes with circular, pentagonal and hexagonal cross sections are formed at 180 °C at a minimum reaction time of 8 h. The Bi2Te3 nanostructure characterizations were investigated using X-ray diffraction crystallography, Field Emission Scanning Electron Microscopy, high resolution transmission electron microscopy, selected area diffraction pattern and Raman measurements. The morphological evolution of Bi2Te3 nanostructures through different reaction times have been observed and possible reaction mechanism is suggested. It is identified that an imperfect oriented attachment mechanism of primary Bi2Te3 particles leads to formation of Bi2Te3 nanotubes. The high energy defect sites formed by the lattice imperfections in Bi2Te3 nanotubes act as a substrate for the emergence of secondary Bi2Te3 nanoplates.
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