| Synthesis of SnO2-reduced graphene oxide nano hybrid for methane gas detection |
| Paper ID : 1625-UFGNSM-FULL |
| Authors: |
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Shiva Navazani *1, ali shokuhfar2, Mostafa Hassani Saadi3 1west unit-4th floor- secnond enetrance- 5th block-banafshe alley-Shaharake Apadana-Tehran-Iran 2Advanced Materials and Nanotechnology Research Lab, Faculty of Mechanical Engineering, K.N. Toosi University of Technology, Tehran, 1999143344, Iran 3Carbon and Nano department, Research Institute of Petroleum Industry |
| Abstract: |
| SnO2 and SnO2/reduced graphene oxide (rGO) nano hybrid were synthesized and used for fabrication of chemiresistive gas sensors for methane (CH4) detection at relatively low temperatures. SnO2 nano particles were dispersed in rGO sheets through one pot hydrothermal method. The nano structured hybrid materials were characterized by X-ray diffractometer (XRD) and Field Emission Scanning Electron Microscope (FESEM). The sensors response to 1000ppm CH4 were measured at temperature range of 50-250C. Our results indicate that rGO significantly increases the response of SnO2-based sensor to methane gas from 9.8% to 45.3%. Presence of rGO sheets in the hybrid, hindered the agglomeration of SnO2 nano particles and on the other hand, SnO2 nano partilces inhibited restacking of rGO sheets, so nano hybrid with high specific surface area for adsorption of oxygen molecules and sensing reaction with methane gas was prepared. In addition, p-n junctions between SnO2 nano particles and reduced graphene oxide sheets, causes a new depletion layer and enhanced the sensing response. Moreover sensor optimum operating temperature for methane detection, reduced from 300 C for pure SnO2 to 150 C for SnO2-rGO, since addition of reduced graphene oxide, lowered the electrical resistance of the sensing material and makes it work at lower temperatures. |
| Keywords: |
| SnO2-rGO nano hybrid- Gas sensor- Methane |
| Status : Paper Accepted (Oral Presentation) |
