Fig. 4From: Facile Synthesis of Hierarchical Tin Oxide Nanoflowers with Ultra-High Methanol Gas Sensing at Low Working Temperaturea The XRD patterns of the HTONF annealed at different temperatures: 300 °C; 400 °C; 500 °C; 600 °C; 700 °C. b The XRD pattern of the HTONF annealed at 400 °C (step 0.02°, integration time 5 s/point)Back to article page