Concentration specific detection of hydrogen at room temperature using palladium nanoparticles-nafion film

Abstract

H2 sensing behaviour of Palladium nanoparticles (PdNP) mixed with nafion has been demonstrated as a function of H2 concentration. PdNP (15 nm diameter) were mixed with nafion (5% solution) in varying concentrations and cast over interdigitated μ-electrodes (IDμE′s). Measurements were carried out at room temperature and change in resistance of the PdNPnafion film upon exposure to hydrogen was recorded. Resistance response studies revealed a unique concentration specific response, exhibiting a pulsed effect (above 1%) and a saturated response (upto 1%), for films cast with solution strength of 2.5 mg PdNPs in 10 μl nafion. The characteristic change in the sensing behaviour can be used to develop a sensor to determine the H2 concentration level with high sensitivity and fast response.