Proceedings of SPIE - the International Society for Optical Engineering
Results of a hydrogen sensor based on light scattering from a porous silicon surface coated with a thin palladium film are discussed. Reflected light scattered from the rough surface of porous silicon surface with a thin palladium film is compared before and after exposure to hydrogen gas. After exposure to hydrogen gas the sensor's optical reflectance is decreased indicating the presence of hydrogen.
Lowrie, C., Earles, S., & De Fernandez, M. (2008). Hydrogen sensor using optical reflectance from porous silicon with a palladium thin film. Paper presented at the Proceedings of SPIE - the International Society for Optical Engineering, 6898 doi:10.1117/12.759198