Preparation and fluorescent chemosensory propertiesof surface-modified conjugated polymer/CdSe quantum dot hybrid composites
| Autor: | Ren-Yi Su, 蘇仁毅 |
|---|---|
| Rok vydání: | 2016 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 104 In recent years, the development of quantum dots (QDs) for use in detecting metal ions and biological species has attracted increasing attention because of their excellent optoelectronic properties. However, the applications of QDs were limited base on their poor solubility in the aqueous phase. In order to improve aggregation of nanoparticles, surface modifications using low molecular-weight compound and polymer-modified QDs are required to permit mono-dispersion of materials and further functionalization is necessary to facilitate specific biological and chemical interactions. In this study, we synthesized the tetrathiafulvalene (TTF)-modified conjugated polymer-nanocrystal nanocomposites (CdSe-DMFe), consisting of a TTF-modified CdSe nanocrystal (CdSe-DMIT) and fluorene monomer, through Suzuki coupling polymerization. Their applications in chemosensor using TTF-modified nanocomposites will be studied. The mean diameter of particle size of CdSe-HTTF-1 was approximately 199.64 nm, and is shown in TEM images. The absorption wavelengths of CdSe-HTTF-1 and CdSe-HTTF-2 were at 421 nm and 422 nm ; and fluorescence wavelengths of were at 477 nm and 496 nm, respectively. CdSe-HTTF-2 showed higher sensitivities toward Fe3+ with Ksv value of 4.32 × 104 M-1. CdSe-HTTF-2 showed fluorescence quenching when pH value changed from 7 to 1, however; pH value at 8–13 showed little effect on the fluorescence intensity. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
| Externí odkaz: |
|