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Article Dans Une Revue Sensors and Actuators B: Chemical Année : 2021

Fluorescent molecular probe based optical fiber sensor dedicated to pH measurement of concrete

Résumé

An optical fiber sensor based on a fluorescent molecular probe has been developed to measure the pH of cementitious materials, from the early stages of the material hydration. A fluorescent molecular probe, Naphth-AlkyneOMe is en-trapped in a cross-linked polyvinyl alcohol-glutaraldehyde matrix to synthesize thin films with pKa values increasing with glutaraldehyde ratio. The obtained sensing films with an average thickness of 150µm show reversible responses to pH change. The developed optode has the required characteristics for the study of concrete, with a response time of 100 s and a precision of ±0.1 pH units. Measurements of pH were performed on the surface of low-pH cement paste samples after 4, 6, 7 and 8 days of hydration.

Domaines

Chimie
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Dates et versions

hal-03221236 , version 1 (07-05-2021)

Identifiants

Citer

Ayedah Tariq, Jalal Baydoun, Charlotte Rémy, Rasta Ghasemi, Jean-Pierre Lefevre, et al.. Fluorescent molecular probe based optical fiber sensor dedicated to pH measurement of concrete. Sensors and Actuators B: Chemical, 2021, 327, pp.128906. ⟨10.1016/j.snb.2020.128906⟩. ⟨hal-03221236⟩
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