Citation
Alkhabet, Mohammed M. and Girei, Saad H. and Al-Isawi, Zaid Khalaf and Shareef, Omar Salah F. and Farhan, Ammar Hatem and Altalebi, Omar and Khalaf, Ahmed L. and Jaafar, Jaafar A. and Yaacob, Mohd H.
(2024)
Palladium (Pd) coated fiber optic hydrogen sensors: a review.
Materials Science in Semiconductor Processing, 188.
art. no. 109204.
pp. 1-31.
ISSN 1369-8001
Abstract
Detecting hydrogen (H₂) at low concentrations (10–100 ppm) over extended periods requires a sensor with high stability and sensitivity. Palladium (Pd) is among the most commonly used materials for H₂ sensing due to its strong affinity for hydrogen. When exposed to H₂, Pd undergoes volumetric expansion proportional to the concentration of H₂ in the environment. Optical sensing technology is particularly suited for H₂ detection, offering a safer alternative to conventional electrical methods in potentially hazardous settings. This review examines the mechanism of palladium hydride (PdHx) formation, a key process in Pd-based H₂ sensing. It provides a comparative analysis of existing technologies for H₂ detection, with a focus on available contact point H₂ sensors, and highlights critical knowledge gaps that impact the performance of Pd-based H₂ optical sensors.
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