Journal
APPLIED SURFACE SCIENCE
Volume 473, Issue -, Pages 564-570Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2018.12.183
Keywords
Selenium nanoribbons; Semiconductor-metallic transition; High pressure; Phase transition; Laser ablation
Categories
Funding
- National Basic Research Program of China [2014CB931704]
- National Natural Science Foundation of China [51571186, 11504375, 11604320, 11674321]
- Anhui Provincial Natural Science Foundation [1508085QA21]
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Single crystalline Selenium (Se) nanoribbons with large length-diameter ratio was catalytically synthesized by laser ablation in liquids. In this study, the unique growth, pressure-dependent phase evolution and superconducting transition of Se nanoribbons are systematically investigated. Importantly, we first found that the semiconductor-metal transition pressure of such Se nanoribbons located at 11.1 GPa at room temperature, which was extremely close to the theoretically predicated value of 11.16 GPa of hexagonal Se. The structure evolution of Se nanoribbons revealed via in situ Raman spectrum indicated three subsequent phase transition stages. The temperature dependence of resistance measurements revealed the occurrence of superconducting state of monoclinic Se at 11.8 GPa, which is markedly lower than reported pressures to date. The phase transition barrier attenuation originating from the volumetric contraction of Se lattice is assumed to offset the influences of temperature and surface energy in low-dimensional Se nanoribbons with large length-diameter ratios, resulting in a transition pressure approaching the predicted value.
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