Four kinds of SnS crystal are prepared by two methods which use H2S in gas phase and Na2S solution reacting with SnCl2 solution at room temperature and 50℃ respectively.The grain size and surface status of the four kinds of powder are characterized by the scanning electron microscopy(SEM).The gas sensitivity test at low temperature shows good response to NH3 and the sensitivity value is up to the maximum within the NH3 concentration range of 0.0148~0.148mmol/L at the working voltage of 10V especially.The shortest response time is 1.5min
and the shortest recovery time is 52s.The material of SnS as the gas sensing material has application prospect in developing energy-saving sensor and detecting the leakage of NH3.
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