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A soft chemical method has been developed for the synthesis of nano-crystalline powders of silver molybdates including Ag 6 Mo 10 O 33 and Ag 2 Mo 2 O 7 . Electrical conductivity, silver ion transport number and gas sensing characteristics of Ag 6 Mo 10 O 33 were measured. This compound was found to sense selectively ammonia at 503 K. Above 503 K, it has significant cross sensitivity to petroleum gas (PG). Ag 2 Mo 2 O 7 showed sensitivity of about 46 % towards 100 vppm of ammonia at 623 K whose detailed results are reported in this paper.

A soft-chemical method has been developed for the synthesis of nano-crystalline powders of silver decamolybdate. Gas sensing characteristics of this composition both in porous pellet and thin film configurations were investigated. The compound Ag 6 Mo 10 O 33 was found to sense selectively ammonia at 503 K. Above 503 K it has significant cross sensitivity to petroleum gas (PG). Spin coated thin films exhibited selective sensing towards PG.