Detection of Ag+ using graphite carbon nitride nanosheets based on fluorescence quenching

Wei Bian*, Hao Zhang, Qing Yu, Meijuan Shi, Shaomin Shuang, Zongwei CAI, Martin M F CHOI

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

64 Citations (Scopus)


The graphite carbon nitride (g-C3N4) nanosheets were synthesized and applied for the detection of Ag+ ion in aqueous solutions. Transmission electron microscopy, Fourier infrared spectroscopy, x-ray diffraction, ultraviolet/visible and photoluminescence spectroscopy were used for characterization of g-C3N4 nanosheets. The fluorescence intensity of g-C3N4 nanosheets decreases with the increase in the concentration of Ag+. The fluorescence probe can be applied for detection of Ag+. The results show that it has high selectivity to Ag+ and exhibits a good linearity over the concentration range 0.020–2.0 μM with a detection limit of 27 nM. Most cations do not have any interference on the detection of Ag+. The quenching process is assessed and discussed. Finally, the g-C3N4 nanosheets have been successfully used for the detection of Ag+ in real water samples. The recoveries of spiked water samples are > 97%.

Original languageEnglish
Pages (from-to)122-127
Number of pages6
JournalSpectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy
Publication statusPublished - 5 Dec 2016

Scopus Subject Areas

  • Analytical Chemistry
  • Atomic and Molecular Physics, and Optics
  • Instrumentation
  • Spectroscopy

User-Defined Keywords

  • Fluorescence quenching
  • g-CN nanosheets
  • Silver ion


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