Hydrothermally prepared porous 3D SnO2 microstructures for methane sensing at lower operating temperature.

Highlights • Porous 3D SnO 2 are synthesized via a facile hydrothermal method. • Compared with some previous studies, 3D SnO 2 has improved gas sensitivity to CH 4. • The CH 4 sensor has good linear relationship in a wider range of gas concentration. Abstract Porous three-dimensional (3D) hierarchical flower-like SnO 2 nanomaterials were successfully synthesized via facile hydrothermal method combined with subsequent annealing process. Characterization analysis shows that the porous 3D SnO 2 consists of a number of thin nanosheets with pores. Gas sensing properties indicate that the porous 3D SnO 2 sensor has lower initial response temperature and optimal working temperature, better linearity in a certain range of gas concentration, better stability and selectivity to methane. Implies that porous 3D SnO 2 nanomaterials will be promising candidates for methane sensors. [ABSTRACT FROM AUTHOR]