Fig. 7. (a) Schematic diagram and (b) morphology of the as-fabricated sensor with the integration of microheater platform and macroporous SnO2 hollow spherical array. (c) Real-time sensor resistance transient to HCHO at 300 °C. (d) Sensor response versus HCHO concentration, and real-time sensor response and recovery behaviors to 0.5 ppm HCHO. Reproduced with permission.84 Copyright 2017, American Chemical Society.
