Pressure and Photoinduced Phase Transitions of Elemental Sulfur Confined by Open-End Single-Wall Carbon Nanohorns
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2018-03-09 |
| Journal | The Journal of Physical Chemistry C |
| Authors | Bo Li, Yanli Nan, Yun Hu, Xiang Zhao, Xiaolong Song |
| Institutions | Xiāan Jiaotong University, Institute of Chemistry |
| Citations | 2 |
Abstract
Section titled āAbstractāConfined molecules in tubular nanospaces of nanocarbons, for example, carbon nanotubes and nanohorns (CNHs), lead to extraordinary behavior and properties different from their bulk analogues. Here, we investigated the confinement effect of CNHs on high-pressure elastic and vibrational properties of sulfur via the diamond anvil cell technique. X-ray diffraction measurements up to 40 GPa demonstrate two phase transitions of S-I ā amorphous ā S-II. A fit of equation of state yields a bulk modulus of ā¼24.8 GPa, about 70% higher than that of soft sulfur. Different from previous Raman studies, laser with red light wavelength (694.8 nm) and high laser density (ā¼2 mW Ī¼m-2) was employed under the threshold for generating C-S bonds. We observed a similar photoinduced transition of S-I to amorphous sulfur at 4-6 GPa compared to the results taken from blue and green light excitation and low laser density (e.g., <28 Ī¼W Ī¼m-2), showing enhanced photothermal stability of sulfur by the aid of single-wall CNHs.