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 Chen, Yi Chun Yeh*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

45 Citations (Scopus)


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. [Figure not available: see fulltext.].

Original languageEnglish
Article number227
JournalMicrochimica Acta
Issue number4
Publication statusPublished - 2019 Apr 1


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

ASJC Scopus subject areas

  • Analytical Chemistry


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