Gas sensing properties of nanocrystalline metal oxide powders prepared by sol-gel method

摘要

SnO2 nonopowders were prepared by sol-gel method and exposed to different thermal decomposition. The XRD and TEM analysis have been carried out. At higher temperature X-ray diffraction peaks are sharper with more intensified peaks. AlsoTEM micrograph reveals that the grain size of nanopowders changed from 10 nm to 80 nm regarding to different thermal treatment. The gas response shows characteristic dependence on dm (grain size). Responses to H2 and LPG gas as a function of operation temperature in dry air for the analyzed sensors with different nano powders show that smaller grain size are more sensitive to H2 and LPG gas.