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Highly sensitive fluorescence sensor for mercury(II) based on boron- and nitrogen-co-doped graphene quantum dots
Ist Teil von
Journal of colloid and interface science, 2020-04, Vol.566, p.357-368
Ort / Verlag
United States: Elsevier Inc
Erscheinungsjahr
2020
Quelle
Access via ScienceDirect (Elsevier)
Beschreibungen/Notizen
We propose a simple green one-pot hydrothermal method to synthesize boron and nitrogen co-doped graphene quantum dots (B, N-GQDs). The B, N-GQDs prepared by this method can detect Hg2+ very quickly and sensitively.
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•B, N-GQDs were synthesized by a one-pot hydrothermal method.•The invention had high novelty.•It had fast response and high sensitivity for the detection of Hg2+.•The minimum detection limit for Hg2+ was 6.4 nM.•B, N-GQDs as a fluorescence sensor can successfully detect Hg2+ in real water samples.
In this work, we invented a new method to synthesize boron- and nitrogen-co-doped graphene quantum dots (B, N-GQDs). This synthesis method was more reliable, simple, and environmentally friendly than the bottom-up methods reported in the current literature that use citric acid or other organic materials as the carbon source. Instead, B, N-GQDs were synthesized from graphene oxide (GO) by a top-down method. The obtained B, N-GQDs showed a bright blue luminescence under a UV lamp at 365 nm, and the absolute photoluminescence quantum yield (PLQY) was 5.13%. Because mercury(II) ions (Hg2+) are highly toxic and can seriously affect the ecological environment and human health, the detection of low-concentration Hg2+ and the establishment of rapid, accurate and sensitive methods for detecting Hg2+ are of great significance to the activities of life, including those of humans. Therefore, using the good luminescence properties of B, N-GQDs, we invented a new type of fluorescence sensor that can detect Hg2+. The sensor was very sensitive to Hg2+, had a good linear relationship in the concentration range of 0.2–1 μM, and exhibited a minimum limit of detection of 6.4 nM. Furthermore, this approach was successfully applied to the detection of Hg2+ in real environmental water samples.