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Production and characterisation of phosphorene nanoribbons

Watts, Mitchell C.; (2020) Production and characterisation of phosphorene nanoribbons. Doctoral thesis (Ph.D), UCL (University College London). Green open access

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Abstract

Phosphorene is a mono-elemental two-dimensional (2D) material with highly anisotropic and tunable properties. Phosphorene nanoribbons (PNRs) present opportunities for additional control over the properties of phosphorene such as electronic & optical band structure and mobilities, as well as the emergence of novel phenomena for applications. Discrete PNRs have previously not been produced. Here a method of production of PNRs is presented by ionic scissoring of macroscopic black phosphorus (BP) crystals. This scalable and top-down method results in stable solutions of PNRs with typical widths of 4-50 nm, predominantly single layer thicknesses, and lengths up to 75 μm and aspect ratios of up to 1000. The PNRs are atomically flat single crystals exclusively aligned in the zigzag (ZZ) crystallographic direction, have uniform width and extreme flexibility. In this thesis, the production methods for PNRs are fully characterised at each stage, as well as a stability study which suggests improved stability v phosphorene sheets. A mechanism is suggested and future experiments are outlined which will allow finer control over the properties of PNRs. This work forms the basis of the current PNR experimental literature and will guide future PNR researchers to create high-quality PNRs and explore their exciting predicted properties and applications.

Type: Thesis (Doctoral)
Qualification: Ph.D
Title: Production and characterisation of phosphorene nanoribbons
Event: UCL (University College London)
Open access status: An open access version is available from UCL Discovery
Language: English
Additional information: Copyright © The Author 2020. Original content in this thesis is licensed under the terms of the Creative Commons Attribution 4.0 International (CC BY 4.0) Licence (https://creativecommons.org/licenses/by/4.0/). Any third-party copyright material present remains the property of its respective owner(s) and is licensed under its existing terms. Access may initially be restricted at the author’s request.
Keywords: phosphorene, nanoribbons, phosphorene nanoribbons, liquid phase exfoliation
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
URI: https://discovery.ucl.ac.uk/id/eprint/10098216
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