The University of Southampton
University of Southampton Institutional Repository

Towards improvement of bismuth and tellurium as a thermoelectric material for energy harvesting through nanostructuring

Towards improvement of bismuth and tellurium as a thermoelectric material for energy harvesting through nanostructuring
Towards improvement of bismuth and tellurium as a thermoelectric material for energy harvesting through nanostructuring
It has been demonstrated that lyotropic liquid crystal templates (LLCT) with mesoporous structures can be used during electrodeposition of thin films to produce films with a mesoporous structure transferred from the LLCT. Here we report the electrodeposition of mesoporous bismuth telluride (Bi2Te3) films from hexagonal structured LLCTs formed from mixtures of Brij®C10 and electrolyte solution in ratios of (55:45, 50:50, 45:55). The introduction of a mesoporous nanostructure to the bismuth telluride films should improve the thermoelectric properties of the material. Optimisation of the electrolyte solutions has been carried out, studying the effects of using the metals bismuth (Bi) and tellurium (Te) and the metal salts bismuth citrate (C6H5BiO7), bismuth nitrate pentahydrate (Bi(NO3)3?5H2O and tellurium dioxide (TeO2) dissolved in nitric acid (HNO3) or citric acid (C6H8O7) in different ratios and concentrations. The addition of a buffer solution made of citric acid and sodium citrate (C6H5Na3O7) has also been investigated. The lyotropic liquid crystal phases present for mixtures containing different concentrations of Brij®C10 and these electrolyte solutions has been looked at, including the production of phase diagrams. The liquid crystal template mixtures have been characterised using a polarised optical microscope (POM) and wide and small angle X-ray Diffraction (XRD) and Cyclic Voltammetry (CV). The deposited thin films have been characterised using wide and small angle XRD, Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray spectroscopy (EDX), confirming that hexagonally nanostructured thin films in the (110) orientation with a composition close to Bi2Te3 have been produced.
Perkins, Stuart
4f29da1b-03c2-47f4-9df0-83a7de681650
Perkins, Stuart
4f29da1b-03c2-47f4-9df0-83a7de681650
Nandhakumar, Iris
e9850fe5-1152-4df8-8a26-ed44b5564b04

Perkins, Stuart (2014) Towards improvement of bismuth and tellurium as a thermoelectric material for energy harvesting through nanostructuring. University of Southampton, Chemistry, Doctoral Thesis, 172pp.

Record type: Thesis (Doctoral)

Abstract

It has been demonstrated that lyotropic liquid crystal templates (LLCT) with mesoporous structures can be used during electrodeposition of thin films to produce films with a mesoporous structure transferred from the LLCT. Here we report the electrodeposition of mesoporous bismuth telluride (Bi2Te3) films from hexagonal structured LLCTs formed from mixtures of Brij®C10 and electrolyte solution in ratios of (55:45, 50:50, 45:55). The introduction of a mesoporous nanostructure to the bismuth telluride films should improve the thermoelectric properties of the material. Optimisation of the electrolyte solutions has been carried out, studying the effects of using the metals bismuth (Bi) and tellurium (Te) and the metal salts bismuth citrate (C6H5BiO7), bismuth nitrate pentahydrate (Bi(NO3)3?5H2O and tellurium dioxide (TeO2) dissolved in nitric acid (HNO3) or citric acid (C6H8O7) in different ratios and concentrations. The addition of a buffer solution made of citric acid and sodium citrate (C6H5Na3O7) has also been investigated. The lyotropic liquid crystal phases present for mixtures containing different concentrations of Brij®C10 and these electrolyte solutions has been looked at, including the production of phase diagrams. The liquid crystal template mixtures have been characterised using a polarised optical microscope (POM) and wide and small angle X-ray Diffraction (XRD) and Cyclic Voltammetry (CV). The deposited thin films have been characterised using wide and small angle XRD, Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray spectroscopy (EDX), confirming that hexagonally nanostructured thin films in the (110) orientation with a composition close to Bi2Te3 have been produced.

PDF
__soton.ac.uk_UDE_PersonalFiles_Users_lp5_mydocuments_Theses PDF files_Stu P MPhil Thesis v3.1 Final.pdf - Other
Download (8MB)

More information

Published date: 1 September 2014
Organisations: University of Southampton, Chemistry

Identifiers

Local EPrints ID: 369338
URI: http://eprints.soton.ac.uk/id/eprint/369338
PURE UUID: 8d9fec8d-13b5-4103-900a-9d403601f204
ORCID for Iris Nandhakumar: ORCID iD orcid.org/0000-0002-9668-9126

Catalogue record

Date deposited: 27 Oct 2014 11:31
Last modified: 14 Jul 2018 00:35

Export record

Contributors

Author: Stuart Perkins
Thesis advisor: Iris Nandhakumar ORCID iD

University divisions

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×