Synthesis of noble-metal doped tin dioxide nanohybrid and its application in the chemiresistive sensors

SnO2 quantum dots and doped SnO2 nanohybrid were synthesized and evaluated as chemiresistive gas sensors for methane detection at moderate temperatures. SnO2-QDs were synthesized through one pot hydrothermal method and doped with noble metal catalyst. The sensors response to 1000ppm CH4 were measured at the temperature range of 100-300oC. Our experiments demonstrated that presence of the dopants increased the response of SnO2-QD sensor toward methane gas from 12.5% to 52% at 200oC. On the other hand, sensing optimum operating temperature for methane, reduced from 300oC for SnO2-QD to 200oC for the hybrid SnO2; addition of the catalysts improved the sensing characteristics of gas sensor and the device could operate at lower temperatures. The nanostructured hybrid materials were characterized by X-ray diffractometer (XRD) and Field Emission Scanning Electron Microscope (FESEM).

کلیدواژه ها:

SnO2 ، sensor ، chemiresistive ، noble-metal doped tin dioxide