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采用荧光光谱及紫外-可见吸收光谱研究了不同条件下磁性纳米氧化铁(MION)与CdTe量子点的相互作用,发 现MION对CdTe量子点荧光有猝灭作用.由Stem-Volmer方程分析得到MION与CdTe量子点结合反应的荧光猝灭速 率常数Kq值为7.68×1015 mol·L-1·s-1,结合紫外-可见吸收光谱进一步证实此过程为静态猝灭过程.并由 Lineweaver-Burk方程得到MION与CdTe量子点结合的热力学焓变(△HΘ)值为21.6 kJ·mol-1、熵变(△SΘ)值为210.3 J· mol-1·K-1和自由能变(△GΘ)值为-41.1 kJ·mol-1(298 K).对其相互作用机理进行探讨,结果表明MION对CdTe量子点 作用为自发过程.主要存在静电作用.“,”The interaction between magnetic iron oxide nanoparticles (MION) and CdTe quantum dots (QDs) was studied by fluorescence and UV-visible absorption spectra. The results showed that the fluorescence of CdTe QDs was strongly quenched by MION. The quenching mechanism was discussed to be a static quenching process, which was proved by the quenching rate constant (Kq=7.68× 1015 mol·L-1·s-1) and UV-vis absorption spectra. According to Lineweaver-Burk equations at different temperatures, the thermodynamic parameters (△HΘ=21.6 kJ·mol-1, △SΘ=210.3 J·mol-1·K-1 and △GΘ=-41.1 kJ·mol-1, 298 K) were obtained. It was found that the process of binding was a spontaneous process with an electrostatic interaction.