| 초록 |
Graphite fibers(GF) is a promising material for heating element due to its low resistivity and excellent heat conductivity. However, pristine GF is insufficient properties for applying the conventional application, compared to metal elements such as nickel-chrome wire. In this study, nitrogen functional groups known to affect electrical conductivity were introduced into GF surface by urea treatment in order to improve the heating properties. The temperature on the surface of nitrogen doped GF increased with increasing added urea content. On the contrary, specific resistance exhibited decreasing trend depending on the increased the contents of urea. These results suggest that the introduced nitrogen functional groups on GF surface facilitate the electron transfer in the GF and thus the surface heating temperature is improved as the amount of applied current increases. Therefore, the urea treatment is an effective method for the improvement of thermal and electrical properties of GF. |
