Development of Diamond-Carbon Nanotube Hybrid Materials

金刚石-碳纳米管杂化材料的研制

基本信息

批准号：
14350429
负责人：
SUZUKI Toshimitsu
金额：
$ 9.54万
依托单位：
Kansai University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-14350429/
关键词：
Diamond Methane Ethane Nickel Palladium TEM Carbon Fiber Carbon nanotube エチレンシリカ CVD

项目摘要

Diamond has unique physical properties and recent progress in CVD diamond process provided semi-conductor diamond thin films. We have first discovered that several metals or metal oxide loaded on powdered diamonds surface exhibited very high catalytic activities in several reactions involving methane and lower hydrocarbons. This research is extent ion of diamond catalyzed reactions of hydrocarbons on metal loaded oxidized diamond to give diamond and carbon nanotube hybrid materials. Diamond is composed of sp3 carbons whereas carbon nanotube is composed of sp2 carbons. If diamond and carbon nanotube hybrid materials could be synthesized, unique physical properties would be expected. From these perspectives, this research was planned and synthesis of diamond-carbon nanotube hybrid material was successfully achieved.Several iron group metal loaded diamond powder was hydrogen reduced and reacted with methane and ethane at an elevated temperature of 400 to 800 ℃. Ni and Pd loaded diamond af … More forded a large amount of carbon nanofibers. On Ni-loaded case the maximum rate of carbon was obtained at 500 ℃ with methane and 600 ℃ with ethane, and from both hydrocarbons no nanofiber formation was observed at 650 ℃. Very small amount of carbon nanofibers were obtained on Co and Fe loaded diamond irrespective of the reaction temperature. On Fe-loaded diamond at 1000 ℃, very small amount of single wall carbon nanotube directly bonded to diamond surface was obtained by TEM observation.On the contrary, with Pd-loaded case carbon nanofibers were produced at higher temperature of 500 to 800 ℃, and even at 800 ℃ a large amount of carbon nanofibers were produced both from methane and ethane. In addition, at 800 ℃ with ethane as a carbon source over Pd-loaded diamond catalyst, very thick carbon fibers were produced by the combinations of initially produced thin carbon fibers.Metal catalyzed carbon nanofiber growth mechanism by the decomposition of hydrocarbon was clarified and this shed light to the design of the catalyst and growth conditions. Less

金刚石具有独特的物理性质，CVD金刚石工艺的最新进展提供了半导体金刚石薄膜，我们首次发现负载在粉末金刚石表面上的几种金属或金属氧化物在涉及甲烷和低级烃的多种反应中表现出非常高的催化活性。研究范围是金刚石催化碳氢化合物在负载金属的氧化金刚石上的反应，以产生金刚石和碳纳米管杂化材料。金刚石由sp3碳组成，而碳纳米管由sp2组成。如果能够合成金刚石和碳纳米管杂化材料，将有望获得独特的物理性能，本研究计划成功合成金刚石-碳纳米管杂化材料。几种铁族金属负载的金刚石粉末是氢。负载Ni和Pd的金刚石在400至800℃的高温下与甲烷和乙烷发生还原反应，在负载Ni的情况下生成大量的碳纳米纤维。在 500 ℃ 下用甲烷和 600 ℃ 下用乙烷获得碳，无论反应温度如何，在 650 ℃ 下都没有观察到在负载 Co 和 Fe 的金刚石上形成极少量的碳纳米纤维。 -在1000℃负载金刚石时，通过TEM观察得到极少量直接键合在金刚石表面的单壁碳纳米管。负载Pd的碳纳米纤维在500至800℃的较高温度下制备，甚至在800℃下，甲烷和乙烷都可以产生大量的碳纳米纤维。此外，在800℃下，以乙烷作为碳源，比Pd还多。 -负载金刚石催化剂，通过组合生产的细碳纤维来生产非常粗的碳纤维。金属催化的碳纳米纤维生长机理碳氢化合物的分解得到了澄清，这为催化剂和生长条件的设计提供了线索。