Synthesis of Two Different Sizes of CdTe Quantum Dots for Detection of Copper(II) in Seawater

Abstract:

The use of CdTe quantum dots (QDs) as fluorescent probes for detection of copper(II) in seawater was evaluated, and the relationship between the size of CdTe QDs and fluorescent response in seawater was investigated. The fluorescence intensity of CdTe QDs was quenched linearly as the concentration of copper(II) increased, and the quenching efficiency increased as the size of the CdTe QDs decreased. The smaller CdTe QDs (emission peak at 518 nm, average diameter of ~2.1 nm) achieved a detection limit of copper(II) of 0.48 μg L−1 under optimal experimental conditions. No significant influence was found for pH in the range from 7.0 to 9.0 in seawater. In contrast, the emission maxima of the CdTe QDs exhibited a slight red shift and the intensity of fluorescence decreased significantly as salinity was increased. Based on the performance of CdTe QDs in this study, small CdTe QDs display enormous potential for detection of copper(II) in seawater.

• Periodical: Advanced Materials Research (Volumes 610-613)
• Pages: 1060-1065
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.610-613.1060
• Online since: December 2012
• Authors: Hua Wang, Yan Su, Wei Wang, Lijun Wang, Feng Yang
• Keywords: CdTe Quantum Dots, Copper(II), Detection, Seawater

References

[1] J.Y. Uriu-Adams and C.L. Keen: Mol. Aspects. Med. Vol. 26 (2005), p.268

[2] H.H. Zeng, R.B. Thompson, B.P. Maliwal, G.R. Fones, J.W. Moffett and C.A. Fierke: Anal. Chem. Vol. 75 (2003), p.6807

[3] Y.J. Song, K.G. Qu, C. Xu, J.S. Ren and X.G. Qu: Chem. Commun. Vol. 46 (2010), p.6572

[4] Y.F. Chen and Z. Rosenzweig: Anal. Chem. Vol. 74 (2002), p.5132

[5] Y.H. Chan, J.X. Chen, Q.S. Liu, S.E. Wark, D.H. Son and J.D. Batteas: Anal. Chem. Vol. 82 (2010), p.3671

[6] Y.S. Xia and C.Q. Zhu: Analyst Vol. 133 (2008), p.928

[7] L. Shang, L.H. Zhang and S.J. Dong: Analyst Vol. 134 (2009), p.107

[8] W.Y. Zhong, J.R. Liang and J.S. Yu: Spectrochim. Acta Vol. 74 (2009), p.603

[9] A. Mandal, J. Nakayama, N. Tamai, V. Biju and M. Isikawa: J. Phys. Chem. B Vol. 111 (2007), p.12765

[10] L.J. Hua, H.Y. Han and X.J. Zhang: Talanta Vol. 77 (2009), p.1654

[11] A.V. Isarov and J. Chrysochoos: Langmuir Vol. 13 (1997), p.3142

[12] H. Borchert, D.V. Talapin, N. Gaponik, C. McGinley, S. Adam, A. Lobo, T. Mo1ller and H. Weller: J. Phys. Chem. B Vol. 107 (2003), p.9662

DOI: 10.1021/jp0352884