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Low concentration hydrogen gas detection is of paramount importance both inspace applications as well as medical applications. It is also criticallyimportant for safe handling of hydrogen below the explosive limit. Here, wereport a novel hybrid Pd metal-polymer chemiresistive sensor that can sense0.5% hydrogen ($H_2$) gas in ambient conditions of temperature and pressurewith the highest reported sensitivity($\sim$30%) obtained earlier by a physicaldeposition technique, making it an extremely good sensor for real life lowconcentration hydrogen gas detection. The sensor is easy to fabricate and isalso extremely cost-effective for commercial applications. The obtained hybridchemiresistive sensor comprises palladium (Pd) nanocrystals bound by oxygen andnitrogen atoms of a stabilizer Polyvinylepyrollidone (PVP), grown on top of aselfassembled monolayer. The exceptional rise time-constant is proposed toarise from hydrogen loading at the (111) surface of the palladium nanocrystalwhich is a very fast process and subsequent fast diffusion of the H atoms fromthe surface into the bulk. An effort to increase the number of available sitesby UV-ozone cleaning, resulted in a degradation of the sensing device due tothe poisoning of the available sites by oxygen.

Metal-polymer hybrid chemiresistive sensor for low concentration fast hydrogen detection