Highly sensitive and selective fiber-optic modal interferometric sensor for detecting trace mercury ion in aqueous solution

Mingjie Yin, Bobo Gu, Jinwen Qian, Aping Zhang, Quanfu An, Sailing He

Research output: Journal article publicationJournal articleAcademic researchpeer-review

17 Citations (Scopus)


A novel type of fiber-optic mercury ion (Hg 2+) sensor was prepared by coating poly (N-ethyl-4-vinylpyridinium chloride) (P4VP·HCl) and poly (sodium-p-styrenesulfonate) (PSS) ultrathin film on the surface of a thin-core fiber modal interferometer (TCFMI) with layer-by-layer (LbL) electrostatic self-assembly method. The fabricated TCFMI Hg 2+ sensor exhibits a high selectivity to Hg 2+ and its detection limit and response time are 10 -9 M and 30 s, respectively. The LbL electrostatic self-assembly process is monitored with a quartz crystal microbalance (QCM) and UV-vis spectroscopy for film growth. Atomic force microscopy (AFM) and field emission scanning electron microscopy (FESEM) were used to characterize the morphology of the ultrathin film. Both demonstrated nanoporous film, which is helpful in shortening the response time of the TCFMI Hg 2+ sensor.
Original languageEnglish
Pages (from-to)1292-1297
Number of pages6
JournalAnalytical Methods
Issue number5
Publication statusPublished - 1 May 2012
Externally publishedYes

ASJC Scopus subject areas

  • Analytical Chemistry
  • Chemical Engineering(all)
  • Engineering(all)

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