快速大氣噴射電漿燒結氧化鐵/奈米碳管製程開發: 應用於超級電容

Abstract

本研究藉由使用有機溶劑混合奈米碳管、氧化鐵、乙基纖維素(黏著劑)調製而成奈米碳管和氧化鐵的複合膠狀溶液。再利用網印製程成膜並以大氣電漿進行表面處理，研究碳管/氧化鐵複合薄膜性質。經過大氣電漿噴射過的薄膜，表面會呈現多孔性結構，且碳成分和有機鍵結及成分會隨著大氣電漿的處理時間變長而變少，這是因為乙基纖維素受大氣電漿反應並被噴流帶走。1wt%奈米碳管摻雜的氧化鐵薄膜電阻率高達108(Ω-cm)，經過大氣電漿表面處理後降到106(Ω-cm)，添加5wt%碳管量電阻率為104(Ω-cm)，經過大氣電漿表面處理後降到102(Ω-cm)。 第二部分的實驗我們藉由大氣電漿分散裝置進行大面積大氣電漿處理，我們藉由不銹鋼製成的T型夾具安裝在大氣電漿的噴管。在噴管正下方處所受到的電漿處理最劇烈，電漿溫度也越高，隨著距離噴管正下方越遠，電漿處理的溫度越弱，但長時間下來也能達到400°C左右。從水接觸角和表面型態來看，最外圍的試片仍能受大氣電漿影響反應，但效果不如正中心點劇烈。

An iron oxide/carbon nanotube mixture pastes were prepared by dissolving Fe2O3 nano-powder and carbon nanotubes in ethanol and terpineol with ethyl cellulose as a binder. The pastes were then screen-printed on the glass substrates, followed by a sintering process using atmospheric pressure plasma jet (APPJ.) The resultant films revealed nanoporous feature. The carbon content decreased as the APPJ sintering time increased and the resistivity decreased by two orders of magnitude. 5 wt% CNT doped Fe2O3 nanoporous films revealed a better conductivity. The sintered Fe2O3/CNT composites were then used as the electrodes of a supercapacitor. A rapid charging/discharging was demonstrated. In the second part of the experiment, an APPJ T-shape expander was installed at the exit of the jet to expand the effective APPJ treatment area. The APPJ treatment area can be extended to an area with a diameter of 4 inches. The steady state temperature at the outer rim of the expander can reach 400 °C. The effectiveness of the plasma influence decreased as the distance increased from the center line of the plasma jet.