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Abstract. Electrical and gas sensing properties of Ag6Mo10033 are investigated for the first time. Wagner's polarization experiment carried out on this material shows that it is a good silver ion conductor in the temperature range of 533 to 657 K. Studies show that it possesses good selectivity and sensitivity towards ammonia with fast response and retrace times indicating its potential as a sensor material for this gas below its TLV value. Morphological changes associated with this compound when exposed to ammonia are studied by using SEM and the corresponding compositional changes associated with each grain is studied by using EDAX. The results indicate that the compound breaks down when exposed to ammonia. When equilibrated with air the reaction products recombine fast to form the original compound.

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Hydrogen sensing ability of anatase TiO 2 nanotubes powder loaded with nanoparticles of Pt is presented. The nanotubes powder of TiO 2 with 5-6 μm length and 15-20 nm diameter, and a specific surface area of 130 m 2 /g was prepared by a novel rapid breakdown anodization technique in sodium chloride electrolyte. Pt nanoparticles with the chemisorption surface area of 97 m 2 /g were loaded over TiO 2 nanotubes by chemical reduction of chloroplatinic acid with sodium borohydride. The screen-printed Pt-TiO 2 nanotubes powder thick film exhibited a linear response to hydrogen concentration varying from 0 ppm to 1000 ppm in argon even at room temperature.