OPTICAL FIBER PH SENSOR BASED ON SELF-ASSEMBLED PDDA/PAA NANOCOATING
Bobo Gu, Ming-Jie Yin, A. Ping Zhang, Jin-Wen Qian
Abstract:
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.
Keywords:
Fiber-optic pH sensor, Fiber modal interferometer, Electrostatic self-assembly
Download:
IMEKO-TC2-2010-08.doc
DOI:
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Event details
IMEKO TC:
TC2
Event name:
TC2 Symposium 2010
Title:
19th Symposium on Photonic Measurements
Place:
Hangzhou, CHINA
Time:
11 September 2010 - 13 September 2010
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