| 초록 |
Transparent heater is one of the promising devices because of its versatile applications such as smart window, thermotherapy, and defrosting, etc. Indium tin oxide is widely used for transparent heater sources due to its high electronic conductivity and visible light transmittance. However, the cost of iridium is too high, and its fabrication needs sophisticated processes, so many studies are focused on alternative materials which are inexpensive, easy-to-synthesize. Graphene is a two-dimensional material in which carbon atoms bond to form a hexagonal structure, and it can be an alternative source due to its superior electronic and thermal conductivity, low-cost, and facile synthesis. Herein, we treated graphite chemically to synthesize graphene oxide, and coated it on the glass substrate, followed by chemical reduction to fabricate large-size reduced graphene oxide on glass (LrGO/glass). Surface characterizations confirm that graphene sheets which size is over 50 μm are synthesized and attached to the glass uniformly, resulting in minimizing intersheet contact resistance on the film. Structural characterizations and XPS spectra demonstrate that LGO sheets are totally reduced to be LrGO, and LrGO sheets on glass showed the transmittance of 76.2 % at 550 nm and the sheet resistance of 0.98 kΩ. Furthermore, the temperature of the substrate increases up to 30 °C when applied 30 V of voltage for 3 min, and the frost on the glass surface vanished within 1 min. From these results, we expect that these graphene sheets can be utilized in our all lives and industries using transparent heater technologies. |
