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化学学报
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化学学报 ›› 2010, Vol. 68 ›› Issue (08): 793-797. 上一篇    下一篇

研究论文

磁性纳米氧化铁与CdTe量子点相互作用的光谱学研究

刘欣，郑成志，杨逸仙，梁建功，韩鹤友*   

  1. (华中农业大学理学院 农业微生物学国家重点实验室 武汉 430070)
  • 投稿日期:2009-08-19 修回日期:2009-11-23 发布日期:2009-12-23
  • 通讯作者: 韩鹤友 E-mail:hyhan@mail.hzau.edu.cn
  • 基金资助:

    200735；A08099；2007XCX003；200851430484；2008CDA080

Spectral Analysis on the Interaction between Magnetic Iron Oxide Nanoparticles and CdTe Quantum Dots

LIU Xin, ZHENG Cheng-Zhi, YANG Yi-Xian, LIANG Jian-Gong, HAN He-You   

  1. (State Key Laboratory of Agricultural Microbiology, College of Science, Huazhong Agricultural University, Wuhan 430070)
  • Received:2009-08-19 Revised:2009-11-23 Published:2009-12-23

PDF

1867

被引次数

12 | 5

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Stern-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(?H?)值为21.6 kJ•mol－1、熵变(?S?)值为210.3 J• mol－1•K－1和自由能变(?G?)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.

关键词: 磁性纳米氧化铁, CdTe量子点, 相互作用, 热力学参数

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 (?H?＝21.6 kJ•mol－1, ?S?＝210.3 J•mol－1•K－1 and ?G?＝－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.

Key words: magnetic iron oxide nanoparticle, CdTe quantum dot, interaction, thermodynamic parameter