Hu, Ziyi (2022) Spectroscopy of single-walled carbon nanotubes with atomic nanowire filling. PhD thesis, University of Warwick.
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Abstract
The tight nanopore of single-walled carbon nanotube (SWCNT) offer atomically smooth templates for the growth of ultrathin one-dimensional (1D) nanocrystals. Although filling of various types of compounds or molecules inside carbon nanotubes has been reported over the last 20 years or so, a comprehensive understand on the physics behind such a coupling between the 1D nanomaterials is far from satisfactory. In this thesis, the optical properties of chirality-refined SWCNTs filled by ultrathin nanowire-shaped crystals were studied by means of steady-state and timeresolved spectroscopy. By encapsulating mercury telluride (HgTe), a narrow band gap semiconductor in the bulk form, the excitonic properties, phonon features and transient dynamics of nanotubes were found to be noticeably changed. Additionally, it was revealed that the performance of carbon nanotubes was determined by both the geometry of nanowire and SWCNT parameters such as chirality or tube diameter. Later in this thesis, the influence of environment on the optical properties of SWCNTs was investigated. By means of photoluminescence characterization, it was demonstrated that a change of the suspending medium from water to gelatin matrix can lead to a modified many-body interactions in nanotubes. Based on the subsequent temperature-dependent photoluminescence and Raman measurements, it was found that the encapsulated nanowires can alter both the intratube stiffness and the intertube interactions of carbon nanotubes.
| Item Type: | Thesis [via Doctoral College] (PhD) |
|---|---|
| Subjects: | Q Science > QC Physics |
| Library of Congress Subject Headings (LCSH): | Carbon nanotubes -- Optical properties, Carbon nanofibers, Nanowires, Nanocrystals -- Synthesis |
| Official Date: | December 2022 |
| Dates: | Date Event December 2022 UNSPECIFIED |
| Institution: | University of Warwick |
| Theses Department: | Department of Physics |
| Thesis Type: | PhD |
| Publication Status: | Unpublished |
| Supervisor(s)/Advisor: | Lloyd-Hughes, James ; Sloan, Jeremy |
| Sponsors: | China Scholarship Council |
| Format of File: | |
| Extent: | xiii, 145 pages : colour illustrations |
| Language: | eng |
| URI: | https://wrap.warwick.ac.uk/180349/ |
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