A graphitic C 3 N 4 nanocomposite-based fluorescence platform for label-free analysis of trace mercury ions.
Xinrong GuoWen YaoSilan BaiJunhui XiaoYubo WeiLishi WangJie YangPublished in: Analytical methods : advancing methods and applications (2024)
In this study, a nanocomposite consisting of graphitic carbon nitride nanosheets loaded with graphitic carbon nitride quantum dots (CNQDs/CNNNs) was synthesized via a one-step pyrolysis method. This nanocomposite exhibited excellent thermal stability, photobleaching and salt resistance. Then a new fluorescence sensing platform based on CNQDs/CNNNs was constructed, which showed high sensitivity and selectivity towards trace mercury ions (Hg 2+ ). By using X-ray photoelectron spectroscopy, UV-vis diffuse reflectance spectra and density functional theory, the fluorescence response mechanism was elucidated where Hg 2+ could interact with CNQDs/CNNNs, causing a structural change in the nanocomposite, further affecting its bandgap structure, and finally leading to fluorescence quenching. The linear range for detecting Hg 2+ was found to be 0.025-4.0 μmol L -1 , with a detection limit of 7.82 nmol L -1 . This strategy provided the advantages of a rapid response and a broad detection range, making it suitable for quantitative detection of Hg 2+ in environmental water.
Keyphrases
- quantum dots
- energy transfer
- label free
- loop mediated isothermal amplification
- visible light
- aqueous solution
- sensitive detection
- density functional theory
- single molecule
- reduced graphene oxide
- fluorescent probe
- high resolution
- living cells
- molecular dynamics
- high throughput
- real time pcr
- drug delivery
- heavy metals
- wastewater treatment
- risk assessment
- magnetic resonance imaging
- human health
- sewage sludge
- climate change