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Two-dimensional nanoplates of Bi2Te3 and Bi2Se3 with reduced thermal stability

Title
Two-dimensional nanoplates of Bi2Te3 and Bi2Se3 with reduced thermal stability
Authors
Kang, Sung MinHa, Sung-SooJung, Wan-GilPark, MansooSong, Hyon-SeokKim, Bong-JoongHong, Jung-Il
DGIST Authors
Hong, Jung-Il
Issue Date
2016-02
Citation
AIP Advances, 6(2)
Type
Article
Article Type
Article
Keywords
Anisotropic GrowthCrystal StructureHexagonal Crystal StructureHexagonal CrystalsHigh Resolution Transmission Electron MicroscopyMelting PointNano-StructuresNanoparticlesPolyvinyl PyrrolidoneSolvothermal MethodSynthesis ReactionTemperature DecreaseThermodynamic StabilityTransmission Electron MicroscopyWidth-to-Thickness Ratio
ISSN
2158-3226
Abstract
Free-standing thin nanoplates of Bi2Te3 and Bi2Se3 were synthesized by solvothermal method. It was demonstrated that the thickness of the nanoplates can be controlled by introducing a controlled amount of polyvinylpyrrolidone (PVP) in the synthesis reaction. PVP bonds to the polar basal planes of hexagonal crystal structure of Bi2Te3 and Bi2Se3, and they suppress the growth (speed) of the hexagonal crystals in the c-axis direction. Highly anisotropic growth yielded the formation of 2-dimensional nanostructures of nanoplates. The plates were examined directly with transmission electron microscopy (TEM) with in-situ heating. These crystalline nanoplates with extremely high width to thickness ratios were found to exhibit much lower thermal stability compared to the bulk counterpart or the conventional nanoparticles as represented by the reduced melting temperature. The melting temperature of a nanoplate decreased by more than 100°C compared to the melting temperature of the bulk material. While it is widely known that the meting temperature decreases for nanoparticles with reduced sizees in all three spatial dimensions, we demonstrate that the reduction in one dimension, i.e. thickness of the platelets in the present study, is effective enough to induce much greater decrease of the melting point than the decrease as observed for the case of nanoparticles. © 2016 Author(s).
URI
http://hdl.handle.net/20.500.11750/5123
DOI
10.1063/1.4942113
Publisher
American Institute of Physics Publishing
Related Researcher
  • Author Hong, Jung-Il Quantum Electric & Magnetic Materials Laboratory
  • Research Interests Electric and Magnetic Properties of Nanostructured Materials; Spintronics
Files:
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Collection:
Department of Emerging Materials ScienceQuantum Electric & Magnetic Materials Laboratory1. Journal Articles


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