Details

Autor(en) / Beteiligte

• Liu, Zhenyu
• Mo, Zunli
• Niu, Xiaohui
• Yang, Xing
• Jiang, Yangyang
• Zhao, Pan
• Liu, Nijuan
• Guo, Ruibin

Titel

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

Link zum Volltext

Quelle

Alma/SFX Local Collection

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. [Display omitted] •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.