Fabrication and Highly Sensitive Gas Sensors Based on h-MoO₃/SnO₂ Hollow Nanostructures Operated at Low Temperatures

Simulated by the synthesis of one dimensional hollow nanostructures with significant sensing, electrical, and optical properties, we have successfully synthesized 1D hollow nanostructures of h-MoO₃/SnO₂ with well-defined multi-side walls. These hollow nanostructured materials synthesized via a hydrothermal method with SnCl₂ · 2H₂O as the precursor and h-MoO₃ as the template. SnO₂ nanoparticles grew on the surface of h-MoO₃ with preferential direction [001]. The morphological change was observed with variation of the growth conditions, such as HNO₃, and h-MoO₃ concentration. 1D hollow nanostructures of h-MoO₃/SnO₂ were studied and their growth mechanism was discussed. The result revealed that the existence of h-MoO₃ caused to increase the sensor response to ethanol gas and downshift the sensor operating temperature at low temperatures.