S5-6 Optical[U1] fiber pH sensor based on self-assembled PDDA/PAA nanocoating

Bobo Gu, Ming Jie Yin, Aping Zhang, Jin Wen Qian

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review


A new fiber-optic pH sensor based on a thin-core fiber modal interferometer (TCFMI) with electrostatic self-assembled nanocoating is presented in this paper. By using layer-by-layer (LBL) electrostatic self-assembly technique, polydiallyldimethylammonium chloride (PDDA) and poly(acrylic acid) (PAA) are deposited on the side surface of TCFMI for pH sensing. Quartz crystal microbalance (QCM) is employed to monitor the thickness growth, and the morphology of the nanocoating is characterized by using atomic force microscopy (AFM). A linear, fast, and monotonic response of the sensor in both acidic and alkaline solutions (pH range: 2~10) with resolution of 0.0082 pH unit was experimentally demonstrated. OCIS codes: 060.2310, 060.2370, 060.2340.
Original languageEnglish
Title of host publicationIMEKO TC2 Symposium on Photonics in Measurements 2010
Number of pages10
Publication statusPublished - 1 Dec 2010
Externally publishedYes
EventIMEKO TC2 Symposium on Photonics in Measurements 2010 - Hangzhou, China
Duration: 13 Sep 201014 Sep 2010


ConferenceIMEKO TC2 Symposium on Photonics in Measurements 2010


  • Electrostatic self-assembly
  • Fiber modal interferometer
  • Fiber-optic pH sensor

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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