Direct Conversion of Single‐Layer SnO Nanoplates to Multi‐Layer SnO₂ Nanoplates with Enhanced Ethanol Sensing Properties

Direct conversion of single‐layer SnO nanoplates to multi‐layer SnO 2 nanoplates is achieved by annealing in an O 2 ambient at 700 °C. For 50 ppm ethanol, the sensitivities of the multi‐layer SnO 2 nanoplates are more than double that of single‐layer SnO 2 nanoplates, which are also formed from the single‐layer SnO. The higher sensitivity of the multi‐layer nanoplates is attributed to their larger surface/volume ratio. The facile fabrication of interconnected multi‐layer SnO 2 nanoplates at low temperature directly on a Si substrate and sensing chip without the aid of catalysts offers vast advantages over competing methods for the fabrication of high‐sensitivity SnO 2 sensors.