Abstract
Nanoparticles made of “pure” and Ni-“doped” Bi2Se3 prototype topological insulators were successfully prepared using the chemical hot-injection method. In both cases, the reaction is kept for a relatively long period, where samples are taken from the reaction flask at successive time steps. High resolution transmission electron microscopy revealed significant morphology differences for the pure and Ni-doped samples at all reaction times. The pure Bi2Se3 samples exhibit spiral-like shapes turning into large sheets with wires-like features at very long reaction times, whereas the Ni-doped samples evolve, with the reaction time, from highly spherical, partially elongated, and finally well-defined nanorods. In addition, Co-doped Bi2Se3 samples, prepared under the same conditions, exhibit large non-uniform flakes at long reaction time. The crystallinity of all pure and magnetic-doped samples was ensured from electron diffraction, and quantitatively obtained from X-ray diffraction measurements. The latter justified the same rhombohedral crystal structure for both the pure and magnetically doped samples, and the absence of other phases. The energy dispersive X-ray spectroscopy was used to quantify the present elements, where the Bi, Se, Ni, and Co peaks were identified. The present study provides a way for tuning the nanoparticles size/morphology of Bi2Se3 and related-compounds by the slight addition of magnetic dopants, which subsequently allows the engineering of various Bi2Se3-based nanoarchitectures.
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This work is supported by the Centre for Special Studies and Programs (BA/CSSP) through the 2013 research Grant.
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Abd El-Fattah, Z.M., Ashoush, M.A. Structural characterization of pure and magnetic-doped Bi2Se3 nanoparticles. J Mater Sci: Mater Electron 29, 2593–2599 (2018). https://doi.org/10.1007/s10854-017-8183-9
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DOI: https://doi.org/10.1007/s10854-017-8183-9