Abstract
A novel all-polymer fiber-optic pH sensor using a UV-cured pH-sensitive hydrogel, poly(ethylene glycol) diacrylate (PEGDA), coated on a polymer fiber Bragg grating was developed. The PEGDA increased in volume according to the pH value of the surrounding fluid, which subsequently induced a lateral stress in the polymer fiber Bragg grating. The proposed pH sensor exhibits a pH sensitivity of up to -0.41 nm/pH and a fast response time of 30 s.
Highlights
PH measurement is crucial for many industries, such as, biological, ecological, environmental science, clinical medicine, and civil engineering
We demonstrate a novel all-polymer pH sensor consisting of a UV-cured poly(ethylene glycol) diacrylate (PEGDA) coating on a single-mode polymer optical fiber inscribed with a Bragg grating
The POFBG pH sensor was evaluated by immersing it in aqueous solutions of hydrochloric acid with pH values between 0 and 6.5
Summary
PH measurement is crucial for many industries, such as, biological, ecological, environmental science, clinical medicine, and civil engineering. The reported pH indicators include both single organic molecules [2,3] and mixture components [4] Optical properties, such as, absorbance [1,5,6] and fluorescence [4,7,8], can be utilized to determine the pH of tested solutions. Zhao et al reported a pH sensor with high sensitivity and a fast response time of 5 s based on a modal interferometer fabricated from thin-core fibers coated with poly(ionic liquid)s and PAA [16]. R. et al demonstrated a pH sensor based on a micro structured POF by detecting dye-doped fluorescence intensity [22] These methods are not stable since the absorbance can be affected by changes in light intensity, temperature, and concentration of indicators. As the sensor was developed toward bio-medical application, only acidic range was considered [24]
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