為了有效利用植物體木質纖維素結構中的碳元素，而不以焚燒的方式讓二氧化碳的氣體排出進而增加大自然的溫室效應，本研究利用農業植物廢棄物，透過碳熱還原法直接生長出奈米碳化矽，由X射線繞射儀分析可觀察到在2θ值為35.7 o、60.0 o、71.8 o為β-SiC結晶特徵繞射峰，也藉由傅立葉轉換紅外線光譜儀(FTIR)分析在797cm-1位置有Si-C吸收峰，顯示本研究已成功製備出奈米碳化矽材料，也有效將植物體結構中的碳元素轉換成可應用的材料。
另一方面，本文藉由額外添加的Fumed silica來增加碳化矽的產量，藉由熱重分析儀(TGA)顯示植物體由無添加及分別添加5wt.% silica、10wt.% silica、15wt.% silica、20wt.% silica之樣本，最後剩下的重量百分比分別為25wt.%、40wt.%、52wt.%、66wt.%、72wt.%，隨著Fumed silica添加量越高，剩下重量百分比越大，經由質量平衡公式計算結果以添加10wt.% Fumed silica的轉化率最高。以掃描式電子顯微鏡(SEM)觀察到農業廢棄物惰性氣氛下高溫鍛燒後會形成顆粒狀、不規則纖維和鬚晶的碳化矽材料，另由高解析度穿透式電子顯微鏡(HRTEM)顯示顆粒狀碳化矽外圍包覆一層碳形成核殼式結構，不規則纖維是成長方向不固定而隨機成長的，鬚晶狀是最主要以成長需最小能量形成，進一步發現利用物質親水性和疏水性的特性，利用有機相和水相來分離出親水性的鬚晶、不規則纖維的碳化矽以及疏水性被包覆在碳裡面的顆粒狀的碳化矽。

In order to use lignocellulose of plant effectively rather than increasing carbon dioxide gas emissions by incineration.In the study, agricultural wastes were used for fabricating nano silicon carbide through carbothermal reduction method .The surface morphologies of nano silicon carbide materials were characterized by scanning electron microscopy (SEM), the results show that there are many flaky and linear part,further through X-ray diffraction (XRD) ,the results indicate successfully synthesis of silicon carbide. Moreover, extra Fumed silica could be added to increase the yield of nano silicon carbide,the study concluded that adding 10wt.% Fumed silica has the highest conversion rate.Through the way, the agricultural waste could effectively reuse and further produce the high value silicon carbide.From high-resolution transmission electron microscopy(HRTEM) results,the growth of silicon carbide structure can be divided into whiskers,nanofiber and particle.The silicon carbide particles were embedded in the amorphous carbon.As a result, The morphology of nano silicon carbide can be separated by characteristic of hydrophilic and hydrophobic.

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