广西师范大学学报（自然科学版） ›› 2014, Vol. 32 ›› Issue (2): 106-110.

• • 上一篇    下一篇

水溶性CdTe量子点在金属离子检测中的尺寸效应

焦杭州1,2, 梁振华1,2, 彭桂花1,2, 周黄歆1,2   

  1. 1.广西师范大学化学与药学学院,广西桂林541004;
    2.广西师范大学药用资源化学与药物分子工程教育部重点实验室,广西桂林541004
  • 收稿日期:2014-02-27 出版日期:2014-06-25 发布日期:2018-09-25
  • 通讯作者: 梁振华(1978—),男,广西柳州人,广西师范大学研究员,博士。E-mail:liangzh@mailbox.gxnu.edu.cn
  • 基金资助:
    国家自然科学基金资助项目(51102053)

Size Effects of Water-Soluble CdTe Quantum Dot in Metal Ion Detection Applications

JIAO Hang-zhou1,2, LIANG Zhen-hua1,2, PENG Gui-hua1,2, ZHOU Huang-xin1,2   

  1. 1. College of Chemistry and Pharmacy, Guangxi Normal University, Guilin Guangxi 541004, China;
    2. Key Laboratory for the Chemistry and Molecular Engineering of Medicinal Resources of State Education Ministry, Guangxi Normal University, Guilin Guangxi 541004, China
  • Received:2014-02-27 Online:2014-06-25 Published:2018-09-25

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摘要： 以巯基乙酸作为修饰剂,控制原料比例、pH值、反应时间,合成了不同粒径的荧光CdTe量子点,通过对各个金属离子的响应测试发现:小粒径量子点均对汞离子表现出淬灭的现象,其他金属离子则无明显响应;而大粒径量子点则对银离子表现出明显的淬灭现象,其他金属离子则无明显响应,两种粒径的量子点对Hg2+和Ag+的检测限分别为8.7 nmol/L和9.9 nmol/L。Hg2+与大小粒径量子点作用的不同现象可能是由于小粒径量子点具有较大淬灭半径所引起,而Ag+与大小粒径量子点作用的不同现象可能是由于大粒径量子点与银离子作用后发生了电子转移过程。证明量子点对金属离子的响应不仅与量子点的修饰剂有关,还与其粒径大小有关。利用这种方法,实现了对Hg2+和Ag+良好的灵敏性和选择性检测。

关键词: 水溶性, 量子点, 金属离子, 检测, 尺寸效应

Abstract: Different sizes of thioglycolic acid capped CdTe quantum dots were synthesized in aqueous solution, the effects of their size on the sensitivity and selectivity in the fluorometric determination of metal ion were studied. It was found that the small sizes of QDs displayed no significant quenching or enhancement responses to most of the observed metal ions except Hg2+, while the QDs with large size displayed no significant quenching or enhancement responses to most of the observed metal ions except Ag+. The detection limits of Hg2+ and Ag+ were 8.7 nmol/L and 9.9 nmol/L, respectively. The different phenomena that different size of QDs function with Hg2+ may be due to the small size of QDs has a larger radius caused by quenching, and the phenomena of Ag+ may be due to occurring transfer processes after the large size of the QDs function with Ag+. This study illuminated unambiguously that improvement of sensing performance by the use of QDs could be achieved readily through fine-tuning their particle sizes and should be considered as an important factor for the development of QDs based probes.

Key words: water-soluble, quantum dot, metal ion, detection, size effect

中图分类号: 

  • O657.39
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