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The Influence of Temperature and Stoichiometry on the Optical Properties of CdSe Nanoplatelets.

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Title: The Influence of Temperature and Stoichiometry on the Optical Properties of CdSe Nanoplatelets.
Authors: Koshkinbayev, Yerkebulan1 (AUTHOR) koshkinbayev17@gmail.com, Ospanova, Aigerim1 (AUTHOR), Akhmetova, Aizhan1 (AUTHOR), Nurakhmetov, Turlybek1 (AUTHOR), Kainarbay, Asset1 (AUTHOR), Zhangylyssov, Keleshek1 (AUTHOR), Dorofeev, Sergey2 (AUTHOR), Vinokurov, Alexander2 (AUTHOR), Bubenov, Sergei2 (AUTHOR) bubenovss@my.msu.ru, Daurenbekov, Dulat1 (AUTHOR) bubenovss@my.msu.ru
Source: Nanomaterials (2079-4991). Nov2024, Vol. 14 Issue 22, p1794. 10p.
Subjects: X-ray reflection, Semiconductor synthesis, Optical properties, Transmission electron microscopy, Ultraviolet-visible spectroscopy
Abstract: Colloidal quasi-two-dimensional cadmium chalcogenide nanoplatelets have attracted considerable interest due to their narrow excitonic emission and absorption bands, making them promising candidates for advanced optical applications. In this study, the synthesis of quasi-two-dimensional CdSe NPLs with a thickness of 3.5 monolayers was investigated to understand the effects of synthesis temperature on their stoichiometry, morphology, and optical properties. The NPLs were synthesized using a colloidal method with temperatures ranging from 170 °C to 210 °C and optimized precursor ratios. Total reflection X-ray fluorescence (TXRF) analysis was employed to determine stoichiometry, while high-resolution transmission electron microscopy (HRTEM) and UV-Vis spectroscopy and photoluminescence spectroscopy were used to analyze the structural and optical characteristics. The results showed a strong correlation between increasing synthesis temperature and the enlargement of nanoscroll diameters, indicating dynamic growth. The best results in terms of uniformity, stoichiometry, and optical properties were achieved at a growth temperature of 200 °C. At this temperature, no additional optical bands associated with secondary populations or hetero-confinement were observed, indicating the high purity of the sample. Samples synthesized at lower temperatures exhibited deviations in stoichiometry and optical performance, suggesting the presence of residual organic compounds. [ABSTRACT FROM AUTHOR]
Copyright of Nanomaterials (2079-4991) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: The Influence of Temperature and Stoichiometry on the Optical Properties of CdSe Nanoplatelets.
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  Data: <searchLink fieldCode="JN" term="%22Nanomaterials+%282079-4991%29%22">Nanomaterials (2079-4991)</searchLink>. Nov2024, Vol. 14 Issue 22, p1794. 10p.
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  Data: <searchLink fieldCode="DE" term="%22X-ray+reflection%22">X-ray reflection</searchLink><br /><searchLink fieldCode="DE" term="%22Semiconductor+synthesis%22">Semiconductor synthesis</searchLink><br /><searchLink fieldCode="DE" term="%22Optical+properties%22">Optical properties</searchLink><br /><searchLink fieldCode="DE" term="%22Transmission+electron+microscopy%22">Transmission electron microscopy</searchLink><br /><searchLink fieldCode="DE" term="%22Ultraviolet-visible+spectroscopy%22">Ultraviolet-visible spectroscopy</searchLink>
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  Data: Colloidal quasi-two-dimensional cadmium chalcogenide nanoplatelets have attracted considerable interest due to their narrow excitonic emission and absorption bands, making them promising candidates for advanced optical applications. In this study, the synthesis of quasi-two-dimensional CdSe NPLs with a thickness of 3.5 monolayers was investigated to understand the effects of synthesis temperature on their stoichiometry, morphology, and optical properties. The NPLs were synthesized using a colloidal method with temperatures ranging from 170 °C to 210 °C and optimized precursor ratios. Total reflection X-ray fluorescence (TXRF) analysis was employed to determine stoichiometry, while high-resolution transmission electron microscopy (HRTEM) and UV-Vis spectroscopy and photoluminescence spectroscopy were used to analyze the structural and optical characteristics. The results showed a strong correlation between increasing synthesis temperature and the enlargement of nanoscroll diameters, indicating dynamic growth. The best results in terms of uniformity, stoichiometry, and optical properties were achieved at a growth temperature of 200 °C. At this temperature, no additional optical bands associated with secondary populations or hetero-confinement were observed, indicating the high purity of the sample. Samples synthesized at lower temperatures exhibited deviations in stoichiometry and optical performance, suggesting the presence of residual organic compounds. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
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  Data: <i>Copyright of Nanomaterials (2079-4991) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.3390/nano14221794
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        Text: English
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        Type: general
      – SubjectFull: Semiconductor synthesis
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      – SubjectFull: Optical properties
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              Text: Nov2024
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