Mingyu Song
Inha Universitiy, South Korea
Title: MOF based Fe2O3 hollow Nano cube @ Graphene oxide-Ni for toxic gas sensor
Biography
Biography: Mingyu Song
Abstract
Graphene has been considered as a promising candidate for gas sensor since its high surface area, conductivity and sensitivity to its surroundings which are attributed to its unique 2D structure and conjugated carbon system. However, graphene should be functionalized to assign selectivity and higher response to bare graphene. On the contrary, metal oxide gas sensors have been reported as high responsive and selective sensors, but its operating temperature is usually higher than 150º C which is not suitable for our daily lives. In this regard, our research groups convert graphene oxide into nickel functionalized graphene oxide composite with Fe2O3 hollow nano-cube for toxic gas sensor at room temperature for synergistic effect of them. As prepared materials were characterized by scanning electron microscope, transmission electron microscope, X-ray diffractometer and gas sensor test system. We found that functionalized graphene oxide has better selectivity and response to formaldehyde gas among ammonia, trimethyl ammonia and formaldehyde gas. Consequently, response of as-prepared sensors is improved by adding iron oxide hollow nano cube. Also, it shows optimum annealing temperature at 300º C in terms sensor performance. The enhanced performance is attributed to the characteristics of nano cubes which have superb adsorption property and ability to prevent aggregation of graphene. Among three toxic gases, the sensor showed the highest response to formaldehyde gas.