پديدآورندگان :
Navazani Shiva shnavazani@mail.kntu.ac.ir Advanced materials and nanotechnology lab. Faculty of materials science and engineering, KNTU, Tehran, Iran;
, Hassanisadi Mostafa mhsaadi@ripi.ir Nanotechnology research center, Research institute of petroleum industry, Tehran, Iran; , Shokufar Ali shokuhfar@knt.ac.ir Advanced materials and nanotechnology lab, KNTU, Tehran, Iran; , Askarieh Mojtaba m.ask@aol.com Nanotechnology research center, Research institute of petroleum industry, Tehran, Iran;
كليدواژه :
SnO2 , sensor , chemiresistive , noble , metal doped tin dioxide
چكيده فارسي :
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).
