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The fluorescent and colorimetric dual-response sensor based on carbon dots doped with nitrogen and sulfur for detecting copper ions

  • Carbon Letters
  • Abbr : Carbon Lett.
  • 2024, 34(4), pp.1155-1164
  • DOI : 10.1007/s42823-023-00682-1
  • Publisher : Korean Carbon Society
  • Research Area : Natural Science > Natural Science General > Other Natural Sciences General
  • Received : November 6, 2023
  • Accepted : December 21, 2023
  • Published : June 14, 2024

Zhang Mengxue 1 Yin Hongna 1 Wan Libin 1 Gao Haidong 1 Liu Song 2 Liu Yeru 1

1Institute of Business Scientific, Henan Academy of Sciences,
2Hunan University

Accredited

ABSTRACT

Heavy metal ions pollution has become of worldwide critical concern, thus, it is particularly important to monitor it in the environment and food for ensuring human health. In this study, p-phenylenediamine and 2-mercaptothiazoline were used to prepare nitrogen (N) and sulfur (S) co-doped carbon dots (N/SCDs) for fluorescent and colorimetric detection of Cu2+. The fabricated N/SCDs with bright green fluorescence showed excellent optical characteristics and favorable water solubility. In an aqueous system, a significant fluorescence quenching of N/SCDs at 512 nm is obtained in the presence of Cu2+. It also caused a significant colorimetric response with the color of prepared N/SCDs solution changed from colorless to yellow. Under optimal conditions, the analytical results showed that the linear range spanning from 5 to 400 μM, with a detection limit of 0.215 μM in fluorescence and 0.225 μM in colorimetric detection. In addition, N/SCDs displayed high selectivity toward Cu2+. No obvious interference was observed over other metal ions. Furthermore, we have also used N/SCDs to monitor Cu2+ in tap and lake water. The recovery of Cu2+ ranged between 89.6% and 113.1%. Exhibiting remarkable sensitivity and selectivity, the designed sensor offers a promising detection method for Cu2+ detection in the real sample.

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