Fig. 7From: Facile Synthesis of Hierarchical Tin Oxide Nanoflowers with Ultra-High Methanol Gas Sensing at Low Working TemperatureHRTEM images and corresponding SAED patterns of HTONF annealed at 300 °C and 400 °C, respectively. a SnO2—300 °C; b SnO2—400 °CBack to article page