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Keywords:

  • nanoplates;
  • sensors;
  • tin oxides

Abstract

Direct conversion of single-layer SnO nanoplates to multi-layer SnO2 nanoplates is achieved by annealing in an O2 ambient at 700 °C. For 50 ppm ethanol, the sensitivities of the multi-layer SnO2 nanoplates are more than double that of single-layer SnO2 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 SnO2 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 SnO2 sensors.