Optical humidity sensing, proton-conducting sol-gel glass monolith

▶ Optical humidity sensing, proton-conducting sol-gel glass monolith is prepared. ▶ The glass monolith exhibits proton conductivities of of ca. 10−1 S cm−1. ▶ The transmittance of the glass monolith changes with humidity. ▶ This glass monolith is utilized for optical humidity measurements.