石墨烯/奈米碳管叢之機械性質研究

Mechanical Properties of Graphene/Carbon Nanotube Forests

10.6342/NTU.2014.01554

陳廷旭

石墨烯 ； 填鐵奈米碳管叢 ； 三維結構 ； 機械性質 ； 奈米壓痕法 ； graphene ； iron-filled carbon nanotube ； 3D structure ； mechanical properties ； nanoindentation

國立臺灣大學機械工程學系學位論文

2014年

碩士

張所鋐

繁體中文

石墨烯與奈米碳管這兩種特別的碳奈米材料，皆擁有相當優異的機械性質，然而目前對於石墨烯與奈米碳管叢兩者結合後擁有的機械性質研究並不多，本研究使用使用化學氣相沉積系統來成長這兩種碳奈米材料，將兩者結合後以奈米壓痕法量測這種三維結構的機械性質，討論石墨烯對填鐵奈米碳管叢與無填鐵奈米碳管叢兩者的機械性質影響，還有不同層數的石墨烯對無填鐵奈米碳管叢的機械性質影響。 本研究發現，少層石墨烯與填鐵奈米碳管叢作結合會造成其機械強度下降，彈性模數為一般填鐵奈米碳管叢的0.6倍，表層硬度則降為0.4倍。而石墨烯與無填鐵奈米碳管叢的結合方式會影響無填鐵奈米碳管叢的機械強度變化與外形，當石墨烯整片覆蓋在碳管叢上時，無填鐵奈米碳管叢機械強度降低；當石墨烯部分覆蓋在碳管叢而部份接觸矽基材作為固定端，則無填鐵奈米碳管叢會受到石墨烯的壓縮導致機械強度增加，當結合的石墨烯層數越多，則機械性質越好，成長的碳管叢高度越低，石墨烯/無填鐵奈米碳管叢的彈性模數最高可達一般無填鐵奈米碳管叢的6.6倍，表層硬度則為5.2倍，研究結果顯示能利用不同層數的石墨烯來控制無填鐵奈米碳管叢的機械強度與外形。

Graphene and carbon nanotube (CNT) are special carbon nanomaterials, both have amazing mechanical properties. However, there are few researches about the mechanical properties of the 3D structure which combined graphene and CNT forests. In this research, we fabricated graphene and CNT forests then used a nanoindentation system to measure reduced modulus (Er) and hardness (H) of graphene/CNT forests and graphene/iron-filled CNT forests, respectively. Additionally, we discussed the influence of different graphene layers on mechanical properties of graphene/CNT forests. Using nanoindentation system, the Er and H of graphene/iron-filled CNT forests is 0.6 times and 0.4 times of pure iron-filled CNT forests, respectively, few-layers graphene could reduce strength of iron-filled CNT forests. And mechanical properties of graphene/CNT forests was influenced by the combined methods of graphene, when graphene had fixed ends on substrate, CNT forests would be compressed by graphene and reinforced strength, we also found more graphene layers could make higher strength of CNT forests, the highest Er and H of graphene/CNT forests are 23.8 MPa and 912 KPa, which are 6.6 times and 5.2 times of pure CNT forests, respectively. In this research, we found a method to control the mechanical properties and geometry of CNT forests by the layers of graphene.

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