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Studying of Surfactant Excess Separation from Non-aqueous Quantum Dots Solution on its Monolayer Formation Process

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Abstract

Controlled purification of non-aqueous solution of CdSe/CdS/ZnS quantum dots (QD) (dispersed in toluene or chloroform) from an excess of surfactant (oleic acid) was studied. The separation of unbound oleic acid from QD solution was carried out by using high-density polyethylene (HDPE) membrane. The secondary solution with a separated surfactant as well as initial QD solution was spread over the water surface to obtain a monolayer with its compression isotherms studied using Langmuir-Blodgett (LB) technique. This approach allowed us to determine the concentration of surfactant at a level of 10−5 mol/l or less for CdSe/CdS/ZnS QD. For better understanding of the influence of purification on the properties of QD, the monolayer of QD was transferred onto solid substrate and its morphology was studied. Atomic force microscopy showed that removal of oleic acid excess results in a more uniform and dense packing of quantum dots.

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Funding

The work was supported by Saratov State University and by the Program of the Ministry of Education and Science of the Russian Federation in the framework of the state task for Ivanovo State University to carry out research work in 2017-2019 (Grant No 16.1037.2017/PP) and partially supported by the RFBR Grants No 16-07-00093 and 16-07-00185.

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Authors and Affiliations

  1. Educational and Research Institute of Nanostructures and Biosystems, Saratov State University, Astrakhanskaya Str. 83, Saratov, Russia, 410012

    Ammar J. Al-Alwani, K. I. Kosolapova, A. S. Chumakov, V. O. Lukyanova, I. A. Gorbachev & E. G. Glukhovskoy

  2. Faculty of Nano- and Biomedical Technologies, Saratov State University, Astrakhanskaya Str. 83, Saratov, Russia, 410012

    Ammar J. Al-Alwani, A. S. Chumakov, V. O. Lukyanova, I. A. Gorbachev & E. G. Glukhovskoy

  3. Babylon University, Babylon, Hilla, Iraq

    Ammar J. Al-Alwani

  4. Nanomaterials Research Institute, Ivanovo State University, Ermak Str. 39, Ivanovo, Russia, 153025

    А. V. Kazak, А. I. Smirnova & N. V. Usol’tseva

  5. Department of Analytical Chemistry and Chemical Ecology, Institute of Chemistry, Saratov State University, Astrakhanskaya Str. 83, Saratov, Russia, 410012

    S. N. Shtykov

Authors
  1. Ammar J. Al-Alwani
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  2. K. I. Kosolapova
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  3. A. S. Chumakov
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  4. V. O. Lukyanova
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  5. I. A. Gorbachev
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  6. А. V. Kazak
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  7. А. I. Smirnova
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  8. S. N. Shtykov
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  9. N. V. Usol’tseva
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  10. E. G. Glukhovskoy
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Correspondence to Ammar J. Al-Alwani.

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Al-Alwani, A.J., Kosolapova, K.I., Chumakov, A.S. et al. Studying of Surfactant Excess Separation from Non-aqueous Quantum Dots Solution on its Monolayer Formation Process. BioNanoSci. 8, 1081–1086 (2018). https://doi.org/10.1007/s12668-018-0537-0

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  • DOI: https://doi.org/10.1007/s12668-018-0537-0

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