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Two types of carbon nanotubes [single walled nanotubes (SWCNTs) and multi walled carbon nanotubes (MWCNTs)] are deposited on porous silicon by the drop casting technique.Upon exposure to test gas mixing ratio 3% NO2,the sensitivity response results show that the SWCNTs’ sensitivity reaches to 79.8%,where MWCNTs’ is 59.6%.The study shows that sensitivity response of the films increases with an increase in the operating temperature up to 200℃ and 150℃ for MWCNTs and SWCNTs.The response and recovery time is about 19s and 54s at 200℃ for MWCNTs,respectively,and 20s and 56s at 150℃ for SWCNTs.