Аннотация:Nanosized BaSnO3 was obtained by peroxide sol-gel and hydrothermal methods.Doped BaSnO3 with uniform La-distribution was synthesized by sol-gel method.Sol-gel prepared BaSnO3 has high sensitivity and selectivity to H2S.The sensitivity to H2S improved with La-doping of sol-gel obtained BaSnO3.It was due to less surface contamination by CO32- in contrast to hydrothermal BaSnO3.