In　this　paper,　the　TiO2　nanotubes　were　synthesized　by　hydrothermal　method　using　a　10　mol/L　NaOH　aqueous　solution　at　150　degrees　C.　The　structure　of　prepared　materials　was　characterized　by　X-ray　diffraction　(XRD),　transmission　electron　microscopy　(TEM),　scanning　electron　microscope　(SEM)　and　Brunauer　Emmett　Teller　(BET).　The　prepared　TiO2　nanotubes　were　used　to　prepare　thick　film　gas　sensors　and　the　gas　sensing　properties　to　various　gases　were　tested.　Results　show　the　prepared　TiO2　nanotube　gas　sensors　responses　to　ethanol　under　dry　condition　at　450　degrees　C.　This　could　be　attributed　to　the　fact　that　it　had　high　porous　morphology　and　a　higher　pore　volume,　which　can　promote　the　diffusion　of　ethanol　deep　inside　the　films　and　improve　the　sensor　response.　Moreover,　the　gas　sensor　made　with　nanotubes　exhibit　high　selective　response　towards　ethanol　gas　compared　with　H-2,　CO,　acetone.　(C)　2010　Ming　Hong　Wu.　Published　by　Elsevier　B.V.　on　behalf　of　Chinese　Chemical　Society.　All　rights　reserved.