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標題: 以商用紙質電木板作為碳源利用裂解法及化學氣相沉積法合成奈米碳材
Utilizing the commercial paper phenolic board to synthesize carbon nanomaterials by thermal pyrolysis and chemical vapor deposition
作者: 林易緯
Lin, Yi-Wei
關鍵字: Carbon nanomaterials
Printed circuit board
Green technology
出版社: 化學工程學系所
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摘要: 印刷電路板(printed circuit board, PCB)是由絕緣材料與導體所組成,依據結構、製程、材質、外觀、物理特性、應用等可以分成多種種類。印刷電路板的主要功能為電器連接及承載元件,故其需具備耐熱、剛強度、低電阻等等特性。隨著電子產品的迅速進步,設計變更以及零件更新都需要重新訂製所需的電路板。相對的,將會有大量的電子產品遭到淘汰,這些淘汰掉的電路板將會對環境造成一定量的破壞。由於電路板上層的金屬價格貴重,通常會以特定蝕刻液回收貴金屬,並還原再利用。而下層的高分子基板由於價格低廉,一般都是送至回收場銷毀並無太大的利用價值。本研究中使用三種不同方式的觸媒,並搭配化學氣相沉積法以即熱裂解法合成奈米碳材,提供一電路板回收再利用之綠色技術。 在熱裂解合成奈米碳材的方法中,利用氯化鎳水溶液作為觸媒前驅物,可以順利的在800-1000℃間合成奈米碳材,在800℃合成出管狀奈米碳管以及片狀的奈米碳纖維,900℃時合成類似鯡魚骨狀的奈米碳纖維、奈米碳球以及鯡魚骨狀的奈米碳纖維,1000℃時則可合成出石墨層為兩種結構的奈米碳管以及片狀的奈米碳纖維,並且可發現ID/IG隨著溫度的升高而下降。 在使用NiMg合金合成奈米碳材時,可發現在低溫的合成條件時,所得到的產物大部份是以無定形的碳為主以及非晶型的奈米碳纖維,當溫度超過750℃之後可發現開始有竹節狀及管狀的奈米碳管生成,並探討流速、碳源量、含氫比的影響,進而尋找碳管生成的最佳條件。另外,利用電木板、酚醛樹酯、廢棄的電路板合成奈米碳管,可發現不同種類的碳源會導致所生成的產物、純度、產量有極大的影響,使用酚醛樹酯時,由於無添加任何不純的成份在其中,可得到純度極純、結晶性佳、直徑分佈均勻的奈米碳管。 使用沸石擔載不同觸媒並以電木板作為碳源合成奈米碳管時,由於擔載在沸石表面的觸媒顆粒較小,使得所合成出的奈米碳纖維與奈米碳管的尺度也較小,在Ni與NiMg觸媒時可得到大部份由碳纖維所組成的產物,利用Co觸媒則可以在1000℃的高溫底下合成奈米碳管,而使用Fe觸媒則可在800-1000℃之間得到非常筆直的奈米碳管與奈米碳纖維。
A bilayer copper (Cu)/polymer laminate is the prototype of printed circuit board (PCB). Owing to possess the characteristics of low cost and easy fabrication, PCBs have been widely manufactured and used in a variety of electronic products. But the lifetime of consumer electronic products is usually very short. They become out-of-date very quickly and then are abandoned. Unfortunately, this produces large amounts of waste electronic products including PCBs which might have detrimental effects on the environment. To reduce the detrimental effects, some metallic components, such as Cu used in conductive traces on PCBs, are recycled and reused. Polymer materials, such as the insulating substrates of PCBs, are also widely used in consumer electronic products. However, the recycling of polymer materials is not currently put into practice. Therefore, development of a suitable recycling technique for the polymer component is urgent. This study demonstrates that the polymer component might be a good carbon source for the synthesis of carbon nanomaterials. Different kinds of catalysts were used to synthesize valuable carbon nanomaterials from the commercial paper phenolic (PP) board. First of all, we used NiCl2(aq) as the catalyst precursor and PP board as the carbon source. Carbon nanomaterials were produced by pyrolyzing PP board and NiCl2¬ at temperatures 800, 900 and 1000℃, respectively, under N2 atmosphere. The tubular and platelet-like nanofibers were synthesized at 800℃, while the herringbone-like nanofibers and carbon nanospheres were found at 900℃. Other than the above, we synthesized two different nanofibers, one is platelet-like and the other is with two graphite staked tubewalls at 1000℃. With increase the temperature, the graphitization degree gets better. Second, the nano-Ni/Mg alloy has been used to grow carbon nanomaterials under various reaction conditions such as reaction temperature, gas flow rate, hydrogen addition, amount of PP board, and carbon source, in order to obtain the optimum growth condition. We could get highest yield and well graphite at 750℃, 100sccm, 100% hydrogen with 10g PP board. Finally, we used zeolite-supported catalysts (such as Ni, Co, Fe, Ni/Mg, and Cu) to synthesize carbon nanomaterials in order to observe the influence of the catalyst size. The CNTs and CNFs were synthesized at 800℃ using nickel as the catalyst, while the CNFs were found at all the temperatures with Ni-Mg. When we used Co as the catalyst, we just could get few carbon nanotubes at 1000℃. Fe as catalyst can synthesize straight CNTs, CNFs, and bamboo-like carbon nanotube between 800℃ and 1000℃.
其他識別: U0005-0607201017365400
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