Method and Pd/V2 O5 device for H2 detection
View Patent ↗Methods and Pd/V 2 O 5 devices for hydrogen detection are disclosed. An exemplary method of preparing an improved sensor for chemochromic detection of hydrogen gas over a wide response range exhibits stability during repeated coloring/bleaching cycles upon exposure and removal of hydrogen gas. The method may include providing a substrate. The method may also include depositing a V 2 0 5 layer that functions as a H 2 insertion host in a Pd/V 2 0 5 hydrogen sensor to be formed on said substrate. The method may also include depositing a Pd layer onto said V 2 0 5 layer; said Pd layer functioning as an optical modulator.
1. An improved method of chemochromic detection of hydrogen gas over a wide range that exhibits stability during repeated coloring/bleaching cycles upon exposure and removal of hydrogen gas, comprising:
subjecting a sensor structure comprising a substrate, a layer of V 2 O 5 coated on said substrate, and about a 30 nm layer of palladium (Pd) coated on said layer of V 2 O 5 to an environment
comprising hydrogen to cause a reaction governed by the equation:
and an optical response governed by the equation:
Pd+XH 2 =PdH 2x ;
wherein said V 2 O 5 layer functions as a H 2 insertion host in the Pd/V 2 O 5 hydrogen sensor, and said Pd layer functions as an optical modulator.
2. The method of detection of claim 1 wherein the Pd/V 2 O 5 structure is not saturated at 2% H 2 or higher.
3. The method of claim 2 wherein hydrogen gas over a wide range that exhibits stability
during repeated coloring/bleaching cycles is between about 1 to about 100% H 2 concentration.
4. The method of claim 1 wherein said palladium layer is deposited by evaporation.