The study of nanosized zeolite films in sensor for DMMP gas detection

Nanosized ZSM-5 and Ag+ modified nanosized ZSM-5 as sensitive films to detect the nerve agent simulant dimethylmethylphosphonate(DMMP) at low concentration has been reported [1]. In order to find the relationship between pore size and sensitivity, larger pore size beta zeolite film was also used to detect the DMMP gas. Different types of zeolite films with specific sensitivity towards low concentration of acetone and ethanol gases were discussed. This observation demonstrates that sensitivity depended not only on the size of the molecules but also morphology of zeolite grains. The Ag+ modified nanosized ZSM-5 film has a high sorption capacity of acetone gas, while nanosized ZSM-5 has higher sorption capacity of DMMP gas. beta zeolite film had the worst absorption of the DMMP gas. The absorption and desorption condition of nanosized ZSM-5 film was also discussed in this paper. Based on these results it was concluded that nanosized ZSM-5 films could be used as effective DMMP gas sensor materials.