Research article

Application of hybrid SiO2-coated CdTe nanocrystals for sensitive sensing of Cu2+ and Ag+ ions

  1. Yongqiang Cao,
  2. Aiyu Zhang,
  3. Qian Ma,
  4. Ning Liu,
  5. Ping Yang*

Article first published online: 22 JUN 2012

DOI: 10.1002/bio.2379

Additional Information

How to Cite

Cao, Y., Zhang, A., Ma, Q., Liu, N. and Yang, P. (2012), Application of hybrid SiO2-coated CdTe nanocrystals for sensitive sensing of Cu2+ and Ag+ ions. Luminescence. doi: 10.1002/bio.2379

Author Information

  1. School of Material Science and Engineering, University of Jinan, Jinan, China

*Ping Yang, School of Material Science and Engineering, University of Jinan, 250022, Jinan, China. Tel: 86- 531–89736225; Fax: 86-531-87974453. E-mail: mse_yangp@ujn.edu.cn

Publication History

  1. Article first published online: 22 JUN 2012
  2. Manuscript Accepted: 3 APR 2012
  3. Manuscript Revised: 9 MAR 2012
  4. Manuscript Received: 31 JAN 2012

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Keywords:

  • hybrid SiO2;
  • CdTe NCs;
  • copper ion;
  • silver ion;
  • ion sensor

ABSTRACT

A new ion sensor based on hybrid SiO2-coated CdTe nanocrystals (NCs) was prepared and applied for sensitive sensing of Cu2+ and Ag+ for the selective quenching of photoluminescence (PL) of NCs in the presence of ions. As shown by ion detection experiments conducted in pure water rather than buffer solution, PL responses of NCs were linearly proportional to concentrations of Cu2+ and Ag+ ions < 3 and 7 uM, respectively. Much lower detection limits of 42.37 nM for Cu2+ and 39.40 nM for Ag+ were also observed. In addition, the NC quenching mechanism was discussed in terms of the characterization of static and transient optical spectra. The transfer and trapping of photoinduced charges in NCs by surface energy levels of CuS and Ag2S clusters as well as surface defects generated by the exchange of Cu2+ and Ag+ ions with Cd2+ ion in NCs, resulted in PL quenching and other optical spectra changes, including steady-state absorption and transient PL spectra. It is our hope that these results will be helpful in the future preparation of new ion sensors. Copyright © 2012 John Wiley & Sons, Ltd.

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