Effects of Zn (II) on the Optical Properties of CdTe Quantum Dots and Their Photoluminescence Response to Lead Ion
Main Article Content
Abstract
Water-soluble CdTe quantum dots (QDs) have been utilized as photoluminescence probes for the detection of metal ions such as Pb2+, Hg2+, Cd2+, etc. We initially developed highly photoluminescence (PL) Zn-doped CdTe for toxic ions detection. A study on the changes of optical properties of Zn-doped CdTe and CdTe QDs when exposed to Pb2+ suggested that Pb2+ could act as a surface passivating agent to reduce Te2- dangling bonds while Zn2+ dopant stabilizes the QDs surface against ambient oxidation. The results demonstrated herein provide useful understandings of the interactions between water-soluble QDs and metal ions. These results suggest further applications of QDs in sensing metal ions.
Keywords:
CdTe quantum dots, sensing, photoluminescence, metal ions, doping.
References
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[6] J. Du, X. Li, S. Wang, Y. Wu, X. Hao, C. Xu, X. Zhao, Microwave-assisted Synthesis of Highly Luminescent Glutathione-capped Zn 1-xCd xTe Alloyed Quantum Dots with Excellent Biocompatibility, J. Mater, Chem, Vol. 22, 2012, pp. 11390-11395, https://doi.org/10.1039/c2jm30882g.
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pp. 3853-3859, https://doi.org/10.1021/cm049172b.
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[15] A. Samanta, Z. Deng, Y. Liu, Aqueous Synthesis of Glutathione-capped CdTe/CdS/ZnS and CdTe/CdSe/ZnS Core/shell/shell Nanocrystal Heterostructures, Langmuir, Vol. 28, 2012, pp. 8205-8215, https://doi.org/10.1021/la300515a.
[16] M. Ulusoy, J. G. Walter, A. Lavrentieva, I. Kretschmer, L. Sandiford, A. Le Marois, R. Bongartz, P. Aliuos, K. Suhling, F. Stahl, M. Green, T. Scheper, One-pot Aqueous Synthesis of Highly Strained CdTe/CdS/ZnS Nanocrystals and Their Interactions with Cells, RSC Adv, Vol. 5, 2015, pp. 7485-7494, ttps://doi.org/10.1039/c4ra13386b.
[17] J. Jasieniak, M. Califano, S. E. Watkins, Size-dependent Valence and Conduction Band-edge Energies of Semiconductor Nanocrystals, ACS Nano, Vol. 5, 2011, pp. 5888-5902, https://doi.org/10.1021/nn201681s.
[18] J. Chang, H. Xia, S. Wu, S. Zhang, Prolonging the Lifetime of Excited Electrons of QDs by Capping them with π-conjugated Thiol Ligands, J. Mater, Chem. C, Vol. 2, 2014, pp. 2939-2943, https://doi.org/10.1039/c3tc32523g.
[19] J. S. Kamal, A. Omari, K. Van Hoecke, Q. Zhao, A. Vantomme, F. Vanhaecke, R. K. Capek, Z. Hens, Size-Dependent Optical Properties of Zinc Blende Cadmium Telluride.pdf, 2012.
[20] M. Boucharef, S. Benalia, D. Rached, M. Merabet, L. Djoudi, B. Abidri, N. Benkhettou, First-principles Study of the Electronic and Structural Properties of (CdTe)n/(ZnTe)n Superlattices, Superlattices Microstruct, Vol. 75, 2014, pp. 818-830, https://doi.org/10.1016/j.spmi.2014.09.014.
[21] Y. R. Luo, Comprehensive Handbook of Chemical Bond Energies, Compr, Handb, Chem, Bond Energies, 2007, pp. 1-1656, https://doi.org/10.1201/9781420007282.
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[23] O. Adegoke, E. Y. Park, Size-confined Fixed-composition and Composition-dependent Engineered Band Gap Alloying Induces Different Internal Structures in L-cysteine-capped Alloyed Quaternary CdZnTeS Quantum Dots, Sci, Rep, Vol. 6, 2016, pp.1-9, https://doi.org/10.1038/srep27288.
[24] J. L. Gautier, J. P. Monrás, I. O. Osorio-Román, C.C. Vásquez, D. Bravo, T. Herranz, J. F. Marco, J. M. Pérez-Donoso, Surface Characterization of GSH-CdTe Quantum Dots, Mater, Chem, Phys, Vol. 140, 2013, pp. 113-118,
https://doi.org/10.1016/j.matchemphys.2013.03.008.
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[26] S. Taniguchi, M. Green, The Room-temperature Structural and Optical Transformation of Cadmium Chalcogenide Quantum Dots Triggered by Reactive Cations, J. Mater, Chem, Vol. 21, 2011, pp. 11592-11598,
https://doi.org/10.1039/c1jm10248f.
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