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Photoluminescence Stability of Colloidal CdTe Quantum Dots in Various Buffer Solutions

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Abstract

Mercaptoacetic acid-capped CdTe quantum dots (QDs) are potential luminescent markers for biological analysis. The photoluminescence (PL) stability of the QDs in buffer solutions determines their practicability as markers in electrophoresis. The stability of the QDs was thus investigated in electrophoresis buffers including tris–borate–ethylenediaminetetraacetic acid (TBE) and tris–acetate–ethylenediaminetetraacetic acid (TAE). The QDs were completely unstable in high-concentrated buffers (≥0.1×). In the case of low concentrations (≤0.07× for TAE, ≤0.035× for TBE), the PL intensity of the QDs in two kinds of buffers decreased with increasing buffer concentrations. A red-shifted PL peak wavelength and PL intensity fluctuation were observed after dispersing the QDs in diluted TAE buffer solutions with concentrations of ≤0.07× for long time. According to the Stern–Volmer plots of PL degradation, the factors leading to the degradation were complicated, which was attributed to the actions of the components including tris, borate or acetic acid, and ethylenediaminetetraacetic acid as well as their mutual effects.

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Acknowledgments

This work was supported by the Program for Taishan Scholars, projects from National Science Foundation of China (21071061), Natural Science Foundation of Shandong Province (ZR2010EZ001 and ZR2011EL029), Outstanding Young Scientists Foundation Grant of Shandong Province (BS2010CL004 and BS2012CL004), the Research Foundation from University of Jinan (XKY0911 and XKY1006), and the Doctor Foundation from University of Jinan (XBS1015 and XBS1027).

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  1. School of Material Science and Engineering, University of Jinan, Jiwei Road 106, Jinan, 250022, People’s Republic of China

    Aiyu Zhang, Ning Liu, Yongqiang Cao, Ruixia Shi, Jianrong Wang, Yuanna Zhu & Ping Yang

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  1. Aiyu Zhang
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  2. Ning Liu
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Correspondence to Ping Yang.

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Zhang, A., Liu, N., Cao, Y. et al. Photoluminescence Stability of Colloidal CdTe Quantum Dots in Various Buffer Solutions. J Clust Sci 24, 427–437 (2013). https://doi.org/10.1007/s10876-013-0566-3

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