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Microchimica Acta

, 186:227 | Cite as

A fluorometric paper test for chromium(VI) based on the use of N-doped carbon dots

  • Kun-Hua Lu
  • Jia-Hui Lin
  • Cheng-Yu Lin
  • Chien-Fu ChenEmail author
  • Yi-Chun YehEmail author
Original Paper
  • 125 Downloads

Abstract

Water-soluble nitrogen-doped carbon quantum dots (C-dots) were fabricated by microwave-induced decomposition of the precursor materials citric acid and N,N′-bis(2-aminoethyl)-1,2-ethanediamine. The C-dots were placed on portable paper strips with novel origami designs to simplified user operations. The intensity of the blue fluorescence, best measured at excitation/emission wavelengths of 330/420 nm, depends on the pH value in the range from pH 2 to 12. The C-dots on the paper stripe are shown to be a sensitive fluorescent probe for chromium(VI) via an inner filter effect. Response is linear in the 0.08 to 1 mM concentration range, and the detection limit (at S/N = 3) is 0.14 mM. The test was applied to the determination of chromium(VI) in (spiked) environmental water samples.

Graphical abstract

Schematic presentation of the water-soluble nitrogen-doped carbon dots (C-dots) as a fluorescent probe for Cr6+ based on an inner filter effect. The three-dimensional paper analytical device integrating C-dots was applied to the determination of Cr6+ in (spiked) environmental water samples.

Keywords

Carbon dots Three-dimensional paper analytical devices Chromium(VI) Origami Paper microfluidic Fluorescence Environmental analysis 

Notes

Acknowledgements

This work was funded by the Ministry of Science and Technology of Taiwan under the project number 107-2113-M-003-013-MY3. We thank Yi-Ju Chou for helpful discussions.

Compliance with ethical standards

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

Supplementary material

604_2019_3337_MOESM1_ESM.pdf (1.1 mb)
ESM 1 (PDF 1.07 mb)

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Copyright information

© Springer-Verlag GmbH Austria, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of ChemistryNational Taiwan Normal UniversityTaipeiTaiwan
  2. 2.Institute of Applied MechanicsNational Taiwan UniversityTaipeiTaiwan

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