Use this URL to cite or link to this record in EThOS: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.599266
Title: The synthesis of novel organic materials for radiation detection
Author: Fung, Y. W. F.
Awarding Body: University of Cambridge
Current Institution: University of Cambridge
Date of Award: 2000
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Abstract:
The aim of the project is to synthesise organic materials to allow for efficient and reproducible quantification of radiation doses. The measurement should be simple, and be able to be read out immediately. In one approach, highly fluorescent organic materials, especially conjugated materials, would be used as radiation detectors. The polymer films will be designed to produce quenching centres upon irradiation; therefore the loss of fluorescence will give an accurate measurement of the total radiation dose received. Another method is to measure the conductivity of the material before and after radiation exposure. A sensitiser or radiaolabile dopant to enhance response may also be necessary. Here, iodine-containing compounds and onium salts were used. Iodine-containing compounds are expected to produce iodine upon irradiation. Onium salts are used as photoinitiators for polymerisations, producing acid species upon irradiation. Both acids and iodine can then act as dopants for conjugated polymers, resulting in quenching of fluorescence and increases in conductivity. A wide variety of materials were synthesised for evaluation. These included iodinated conjugated polymers, sulphonium and iodonium salts. A novel fluorescent diacetylene was also synthesised as well as several known polymers such as MEH-PPV, PHT and poly(3-BCMU). The effects of visible light on these materials, as well as blends were looked at, and some novel effects found. In particular, the photosensitisation and subsequent doping of MEH-PPV with onium salts was discovered.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.599266  DOI: Not available
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