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  • Küçük Resim
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    Friction and wear characteristics of bismuth selenide topological insulator
    (Elsevier, 2023) Uzun, Utku; Lamuta, Caterina; Yetmez, Mehmet
    Single crystal Bi2Se3 was grown using the novel Bridgeman-Stockbarger method. Surface characteristics in terms of wear rate (W), wear coefficient (K), coefficient of friction (COF), and strain hardening exponent (n) were investigated using nanoindentation and nano scratch techniques. Our results revealed that the remarkable wear properties of single-crystal Bi2Se3 are promising for nanoscale design of topological insulators.
  • Küçük Resim
    Öğe
    Nanoindentation Creep Behavior of Single-Crystal Bi2Se3 Topological Insulator
    (Wiley, 2022) Uzun, Utku; Lamuta, Caterina; Yetmez, Mehmet
    A single-crystal Bi2Se3 topological insulator is fabricated using the Bridgman-Stockbarger method. The crystal structure and atomic lattice parameters are identified by X-ray diffraction analysis. The nanoindentation size effect on creep displacement, activation volume, and strain rate sensitivity (SRS) with different maximum holding loads between 1000 and 5000 mu N is investigated using depth-sensing nanoindentation. Furthermore, the effect of the loading rate on the steady-state creep displacement and SRS is analyzed and discussed. Results show Bi2Se3's low resistance to plastic deformation and a significant increase of creep displacement with increasing holding load and holding rate. Additionally, creep strain rate, activation volume, and SRS are also calculated from the secondary stage creep, and results are compared with those of other flexible electronic materials.