Dr. Matthew Duff Profile

Dr. Matthew Duff

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Proceedings Article | 12 April 2021 Presentation + Paper

Atomic layer deposited TiO2 on optical fiber for pH sensing at 80 °C

Fei Lu, Ruishu Wright, Ping Lu, Paul Ohodnicki, Matthew Duff, Jung-Kun Lee, Michael Buric

Proceedings Volume 11739, 117390B (2021) https://doi.org/10.1117/12.2587505

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Real-time pH monitoring of cement can improve maintenance schedules and predict early failures for wellbores, which is beneficial for wellbore integrity monitoring in oil and gas production and carbon dioxide sequestration. Metal oxideenabled fiber optic pH sensors offer a solution for real-time distributed pH monitoring at high temperature high pressure conditions in the wellbores, and such harsh conditions disable many other pH sensing techniques. Our previous investigation revealed that a fiber optic sensor with sol-gel coated titanium oxide (TiO₂) is capable of pH sensing in the high alkaline range at 80 °C, relevant for the wellbore cement conditions. Atomic layer deposition (ALD) approach provides uniform conformal films on complex surfaces, which could enhance the TiO₂ film stability on the optical fiber. This work presents detailed characterization and testing of ALD TiO₂ thin films for pH sensing by measuring the pHdependent transmission of the coated fiber optic sensors at room temperature and 80 °C. ALD TiO₂ has demonstrated enhanced sensing performance compared to sol-gel TiO₂ in terms of sensitivity, reversibility, and stability.

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