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Microchimica Acta

, Volume 183, Issue 6, pp 1899–1907 | Cite as

Synthesis of yellow fluorescent carbon dots and their application to the determination of chromium(III) with selectivity improved by pH tuning

  • Melissa May Fung Chang
  • Irine Runnie Ginjom
  • Maria Ngu-Schwemlein
  • Sing Muk Ng
Original Paper

Abstract

Carbon dots with yellow fluorescence (y-CDs) were synthesized from sucrose by acid carbonization with phosphoric acid as the dehydrating agent. Optimal yield was obtained by heating sucrose in concentrated phosphoric acid to 85 °C for 30 min. The resulting y-CDs under the photo-excitation at 360 nm display an emission band peaking at 560 nm. The fluorescence is independent of pH values in the range from pH 4.0 to 11.4, and at ionic strengths of up to 4.7 M of potassium chloride. We also show that these y-CDs are viable fluorescent probes for the detection of chromium(III). At near neutral pH conditions, several metal ions quench the emission of the y-CDs, but under acidic conditions (pH 4), fluorescence is strongly affected by Cr(III) only. Quenching depends on the concentration of Cr(III) in the range up to 200 μM, and the limit of detection is 24.6 μM.

Graphical Abstract

Yellow fluorescent carbon dots, denoted as y-CDs, were synthesised through acid carbonisation of sucrose with concentrated phosphoric acid. The y-CDs, if excited at 360 nm, display an emission band peaking at 560 nm. These y-CDs are viable fluorescent probes for determination of chromium(III) with better selectivity under acidic conditions.

Keywords

Optical probe Nanoprobe Fluorescence Quenching Water analysis Carbonization 

Notes

Acknowledgments

We would like to extend our gratitude to the laboratory technicians and colleagues of Swinburne University of Technology Sarawak Campus for their continuous support and guidance. Special thanks to Ms. Jessica Fong and Ms. Ng Yann Huey for their valuable help and contribution in the experimental study of this work. Financial support was provided by Swinburne University of Technology Sarawak Campus through the Swinburne Sarawak Research Grant, Phase 1/2013 (2-5509).

Compliance with ethical standards

The author(s) declare that they have no competing interests.

Supplementary material

604_2016_1819_MOESM1_ESM.docx (228 kb)
ESM 1 (DOCX 228 kb)

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Copyright information

© Springer-Verlag Wien 2016

Authors and Affiliations

  • Melissa May Fung Chang
    • 1
    • 2
  • Irine Runnie Ginjom
    • 1
    • 2
  • Maria Ngu-Schwemlein
    • 3
  • Sing Muk Ng
    • 1
    • 2
  1. 1.Faculty of Engineering, Computing and ScienceSwinburne University of Technology Sarawak CampusKuchingMalaysia
  2. 2.Swinburne Sarawak Research Centre for Sustainable TechnologiesSwinburne University of Technology Sarawak CampusKuchingMalaysia
  3. 3.Chemistry DepartmentWinston-Salem State UniversityWinston-SalemUSA

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