Mesoporous polycrystalline SnO2 framework synthesized by direct soft templating method for highly selective detection of NO2.

摘要: SnO2 is one of the most studied oxide materials for gas sensing applications. Investigations have shown that sensitive to a wide range gaseous compounds. However, its lack selectivity remains an issue. Here, mesoporous polycrystalline framework was successfully synthesized using soft templating method at ambient temperature and pressure. The prepared were characterized x-ray diffraction analysis, high-resolution transmission electron microscopy, energy-dispersive spectroscopy, N2 sorption tests, photoelectron spectroscopy. Gas analyses performed on two batches material calcined 400 °C 500 °C. resultant highly conductive relatively low operating temperatures. thermal annealing temperatures had significant effects their response selectivity. structure showed very selective 407 1 ppm NO2. superior performance obtained attributed small crystal size 4-5 nm-less than double thickness critical depletion layer-as well as high surface area 89 m2 g-1 pore volume 0.12 cm3 g-1.