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Tailoring properties of polythiophene-based electrochromic displays

Yang, Shufan 2021. Tailoring properties of polythiophene-based electrochromic displays. MPhil Thesis, Cardiff University.
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The synthesis of sixteen thiophene-based copolymers was achieved, using four known 3,4-bis(alkyloxy)thiophene monomers copolymerised with four novel alkoxybenzyl/alkoxynaphthyl thiophene (3 and 4 position) monomers respectively. The polymerisation was performed using a ratio of known monomer to novel monomer of 10 to 1, using iron (III) chloride as catalyst. The steric hindrance of these copolymers can be changed marginally by varying the different positions of the substituent in the alkoxy thiophene (3 and 4 position) monomers. The colour and the properties of copolymers are also changed through the modulation of the steric hindrance. All synthesised copolymers were used to fabricate prototype electrochromic devices and subjected to spectroelectrochemical analysis. In particular, copolymer 75 exhibited excellent electrochromic properties which can be fully oxidised at very low applied voltage (+ 1.5 V) and exhibited fast switching times (0.6 s). It switched between a purple colour in the neutral state and a highly transparent colour in its oxidised state.

Item Type: Thesis (MPhil)
Date Type: Completion
Status: Unpublished
Schools: Chemistry
Date of First Compliant Deposit: 22 July 2021
Last Modified: 02 Aug 2022 01:15

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