Forming water-soluble CdSe/ZnS QDs using amphiphilic polymers, stearyl methacrylate/methylacrylate copolymers with different hydrophobic moiety ratios and their optical properties and stability |
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Authors: | Zhanyu Wu Yili Zhao Fangping Qiu Yapeng Li Shuwei Wang Bohan Yang Liang Chen Jinghui Sun Jingyuan Wang |
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Affiliation: | aAlan G. MacDiarmid Institute of Jilin University, Changchun 130023, People's Republic of China;bSchool of Chemistry and Life Science, Changchun University of Technology, Changchun 130012, People's Republic of China;cFirst Hospital of Jilin University, Changchun 130023, People's Republic of China |
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Abstract: | The amphiphilic stearyl methacrylate/methylacrylic acid copolymers (PSMs) were used as phase transfer reagents to convert CdSe/ZnS core-shell quantum dots (QDs) in chloroform to water-soluble PSMs-coated quantum dots (PSM-QDs). The optical properties and stability of PSM-QDs were influenced by the hydrophobic moiety ratios of PSMs, the PSM/QDs mass/volume ratio and the reaction time. The resulting PSM-QDs on optimum reaction conditions retained 60% of the photoluminescence value of the original CdSe/ZnS QDs in chloroform. The carboxylate-based PSM-QDs survived UV irradiation in air for at least 15 days. Upon UV irradiation, the PSM-QDs became about 2 times brighter than the original CdSe/ZnS QDs in chloroform, and the UV-brightened PL can retain the brightness for at least several months. Experimental results further confirmed the stability of PSM-QDs against strong acid, photochemical and thermal treatments. In addition to good performance of PSM-QDs, the synthesis of PSM and the corresponding water-soluble QDs is relatively simple. |
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Keywords: | CdSe/ZnS PSM Water-soluble Phase transfer |
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