Room-temperature NH

3

sensors are fabricated by vacuum thermal evaporation of CuBr on a ceramic substrate in an Ar environment.The crystal structure and morphological feature of the CuBr sensitive material are analyzed by XRD

SEM characterization methods.The results show that the fabricated CuBr is pure phase material with three-dimensional and porous network architectures.The real-time response properties of CuBr sensor are evaluated when exposed to 0.5～10×10

-6

NH

3

at room temperature.The evaluating results show that porous CuBr sensor exhibits higher sensitivity than some semiconductor and polymeric compound sensors.The response time of porous CuB

r sensor is about 2～3 orders of magnitude higher than that of CuBr sensors prepared by other different methods.The excellent sensitive properties and enhanced response time of porous CuBr sensor are ascribed to the specific interactions between Cu

+

and NH

3

as well as three-dimensional and porous network architectures.