本文選題：碳納米管 + 定向生長��； 參考：《西北大學》2015年碩士論文

【摘要】：碳納米管陣列(CNTs array)具有獨特的拓撲結(jié)構(gòu)及優(yōu)異的物理化學性能,在很多領(lǐng)域都有廣泛的應用。目前,將碳納米管陣列作為減小反射、增強吸收的涂層材料方面的應用具有巨大的潛在價值,并且可以很快的實現(xiàn)工業(yè)化應用。但對于碳納米管陣列反射性質(zhì)方面的研究仍然是不足的,實驗得到的反射率結(jié)果與理論計算仍然有一定的差距,且反射率隨入射角度變化規(guī)律的研究不夠詳細。為了系統(tǒng)地研究碳納米管陣列的反射性質(zhì),我們制備了不同厚度的定向碳納米管陣列并對其在可見-近紅外波段變角度的反射性進行了研究,得到了小角度入射下極低的反射率以及在不同入射角度下的反射率變化規(guī)律。本論文的主要工作如下：(1)實驗中基于改進的無需預先處理襯底的熱CVD法系統(tǒng)地研究了反應溫度、氫氣比例、催化劑濃度及生長時間四個反應條件對垂直定向碳納米管陣列組織形貌的影響,實現(xiàn)了高質(zhì)量定向碳納米管陣列的可控制備：生長時間一定時,碳管陣列的長度在溫度700℃,催化劑濃度0.05g/ml,氫氣與氬氣濃度之比為2/8時達到頂峰；碳納米管陣列的生長速率分為兩個階段,前25 min基本是線性增長的,之后變得平緩；適宜碳納米管定向生長的溫度范圍是700-740℃,催化劑濃度范圍是0.05～0.06 g/ml,生長時間范圍是5～25 min,氫氣與氬氣濃度之比為1/9～3.5/6/5。(2)通過對本實驗得到的定向碳納米管陣列進行可見一近紅外波段變角度反射率的測量,系統(tǒng)地研究了波長、入射角度及碳管陣列厚度對反射率的影響,并且實驗觀察到拐角θ0會隨著波長的增加而減��；入射角度在拐角θ0之前其反射率極低,入射角度在拐角θ0之后其反射率呈指數(shù)增長；從實驗研究中還得到輕微的不定向性不會對反射率有太大的影響,并且在波長一定的情況下,厚度和反射率及拐角θ0之間并無明顯規(guī)律,,但總體上長的碳管比短的碳管反射率更低。
[Abstract]:CNTs array (CNTs array) has been widely used in many fields due to its unique topological structure and excellent physical and chemical properties. At present, the application of carbon nanotube arrays as a coating material to reduce reflection and enhance absorption has great potential value, and can be applied to industrial applications very quickly. However, the research on the reflection properties of carbon nanotube arrays is still insufficient, the experimental results of reflectivity are still far from the theoretical calculation, and the variation of reflectivity with incident angle is not enough detailed. In order to systematically study the reflective properties of carbon nanotube arrays, we have prepared directional carbon nanotube arrays with different thickness and studied their reflectivity at different angles in the visible and near infrared band. The very low reflectivity and the variation of reflectivity at different incident angles are obtained. The main work of this thesis is as follows: (1) in the experiment, the reaction temperature and hydrogen ratio are systematically studied based on the improved thermal CVD method, which does not need to preprocess the substrate. The effects of catalyst concentration and growth time on the morphology of vertical aligned carbon nanotube arrays were investigated. The controllable fabrication of high quality oriented carbon nanotube arrays was achieved. The length of carbon nanotube arrays was 700 鈩，

本文編號：1778339