SYNTHESIS SNO2 GRAPHENE NANOMATERIAL WITH POLYOL METHOD AND BAND GAP TEST FOR CO GAS SENSOR

• Main Author: Andika - Nim: 13312044, Richard
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/30418
• Institution: Institut Teknologi Bandung

<p align="justify">Environmental pollution is one of the major problems in the world today. Environmental pollution in the form of the largest air pollution produced by fossil fuels, and industry. Many researchers look for gas sensors to prevent the increase of air pollution in the world, so before being released into the air, the waste can be processed first before disposal. Semiconductor material is one of the best choice to become a gas sensor. <br /> <br /> <br /> Metal oxide semiconductor material is chosen as a gas sensor because of its easy to modify metal oxide properties as needed. In this final project, the metal oxide selected is SnO2 because it has higher chemical and physical resistance than others. <br /> <br /> <br /> To increase its low selectivity and lower operating temperature, SnO2 semiconductor doped with Graphene at 1: 1 molar ratio, synthesized by polyol method using a solvent of ethylene glycol at 197 oC for 12 hours. SnO2 Graphene is then settled, and calcined at a temperature of 550 oC. After that, it was characterized by SEM, TEM, EDS, UV-Vis spectrophotometers and tested their performance with a CO gas test. Band Gap SnO2 Graphene is 2.94 eV with particle size of 5 - 15 nm and has the highest sensitivity of 59% when detecting CO gas in 20 ppm for 10 min at 300 oC. <p align="justify"> <br />