Jump to main content
Jump to site search


One-step microwave synthesis of carbon dots for highly sensitive and selective detection of copper ion in aqueous solution

Abstract

Highly fluorescent carbon dots (CDs) are prepared by a one-step microwave heating method using citric acid, L-cysteine and dextrin as the precursors. The average size of the CDs is 2.61 nm with good water dispersibility and photostability. Compared with undoped CDs, a small amount of nitrogen (N) and sulfur atom (S) co-doped CDs exhibit the red shift of absorption spectra to visible region and a high quantum yield of 22 %. Due to a large amount of carboxyl and hydroxyl groups (-COOH and -OH) on the surface of the CDs, Cu2+ is selectively detected in aqueous solution at pH 7.0 with a detection limit as low as 20 nM, which is much lower than the maximum concentration of Cu2+ in drinking water (~20 μM) permitted by the US Environmental Protection Agency (EPA). Moreover, the application in tap water samples further demonstrates that the as-synthesized CDs are a good candidate for monitoring of Cu2+ in environmental water samples.

Back to tab navigation

Supplementary files

Publication details

The article was received on 17 Dec 2017, accepted on 12 Jan 2018 and first published on 12 Jan 2018


Article type: Paper
DOI: 10.1039/C7NJ05000C
Citation: New J. Chem., 2018, Accepted Manuscript
  •   Request permissions

    One-step microwave synthesis of carbon dots for highly sensitive and selective detection of copper ion in aqueous solution

    Q. Liu, N. Zhang, H. Shi, W. Ji, X. Guo, W. Yuan and Q. Hu, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C7NJ05000C

Search articles by author

Spotlight

Advertisements