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Synthesis of Luminescent Carbon Dots for Selectivity Study Towards Metal Ions

Ghasemi, Nazer Hossein | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 50070 (03)
  4. University: Sharif University of Technology
  5. Department: Chemistry
  6. Advisor(s): Hormozi-Nezhad, Mohammad Reza
  7. Abstract:
  8. Today, the use of graphene quantum dots has been very much considered due to easy synthesis methods, strong fluorescence emission, and many sources of synthesis. In this study, the effect of changing capping agent of graphene quantum dots toward iron (Ⅲ), copper (Ⅱ) and mercury (Ⅱ) ions was studied. The linear range of response of the graphene quantum dots synthesized with ethylenediamine for mercury (Ⅱ) and iron (Ⅲ) ions was 10-70 µM, and this sensor also responded to Cu (Ⅱ) ions. Urea synthesized graphene quantum dots also responded to all three ions. The linear range of the response for mercury (Ⅱ) , iron (Ⅲ) and copper (Ⅱ) ions was 5-25, 10-70 and 120-120 μM respectively. The linear range of the response for ethanolamine synthesized graphene quantum dots for iron (Ⅲ) was 10-100 μM, and also these graphene quantum dots responded to mercury ions (Ⅱ) and copper (Ⅱ) ions. These graphene quantum dots responded to nearly all three ions in the range of 10-80, linear discrimination analysis was used to differentiate the different concentrations of these three ions. linear discrimination analysis allowed for concentrations of 10-80 µM of these ions, which shows that although these graphene quantum dots are not special sensors for iron ions (Ⅲ), mercury (Ⅱ) and copper (Ⅱ), but they can be used as sensors element in sensor arrays approach
  9. Keywords:
  10. Graphene Quantum Dots (GQDs) ; Cupper (II) Ion ; Sensors Array ; Changing Capping Agent ; Mercury (II) Ions ; Iron (III) Ions

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