A fluorometric paper test for chromium(VI) based on the use of N-doped carbon dots
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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.
KeywordsCarbon dots Three-dimensional paper analytical devices Chromium(VI) Origami Paper microfluidic Fluorescence Environmental analysis
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.
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