The double-effect mechanism between Fe₃O₄ nanoparticles and MSA-capped CdTe QDs

详细信息	查看全文 | 推荐本文 |

• 作者：Guannan Wang^a ; Xingguang Su^b ; Shijing Yang^a ; Yunhong Jia^a ; ^{jiayunhong@tom.com} ; Donghui Li^a ; ^{lidonghuilx@sina.com}
• 关键词：Water-soluble mercaptosuccinic acid (MSA)-capped CdTe ; Superparamagnetic Fe3O4 nanoparticles ; Fluorescence enhancement ; Double-effect mechanism
• 刊名：Journal of Luminescence
• 出版年：2012
• 期刊代码：54_00222313
• 类别：ch
• 出版时间：September, 2012
• 卷：132
• 期：9
• 页码：2505-2511
• 文件大小：725 K

摘要

Water-soluble mercaptosuccinic acid (MSA)-capped CdTe quantum dots (QDs) of two sizes and superparamagnetic Fe₃O₄ nanoparticles have been synthesized and used to investigate the effect of the mechanism of Fe₃O₄ nanoparticles on the fluorescence intensity of QDs. In the presence of a low concentration of Fe₃O₄ nanoparticles, the CdTe QDs with smaller particle size exhibit fluorescence quenching while fluorescence enhancement of CdTe QDs with larger particle size was observed, and the fluorescence intensity changes with the excitation wavelength and the concentration of Fe₃O₄ nanoparticles. The mechanism study shows that there is a double-effect between the Fe₃O₄ and CdTe QDs: one is the fluorescence quenching effect due to Fe₃O₄ strong absorption of excitation and emission light, the other is the fluorescence enhancement effect resulting from a localized electromagnetic field caused by the absorption of exciting light. The fluorescence of CdTe QDs with lower concentration of Fe₃O₄ nanoparticles was determined via the synergy of the double-effect. To our best knowledge, this is the first systematic study on the interaction between Fe₃O₄ nanoparticles and CdTe QDs, which finds the fluorescence enhancement effect in the presence of low concentration of Fe₃O₄.