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

钻石具有独特的物理特性，CVD钻石工艺的最新进展提供了半导体钻石薄膜。我们首先发现，在涉及甲烷和较低碳氢化合物的几种反应中，几种金属或金属氧化物在粉末状钻石表面上暴露了很高的催化活性。这项研究是碳氢化合物在金属载氧化物钻石上的钻石催化反应的范围，以提供钻石和碳纳米管杂种材料。钻石由SP3碳组成，而碳纳米管由SP2碳组成。如果可以合成钻石和碳纳米管混合材料，则可以预期独特的物理特性。从这些角度来看，这项研究是计划的，并成功实现了钻石碳纳米管杂种材料的合成。几种铁基金属载有钻石粉还原并与甲烷和乙烷在400至800℃的升高中与甲烷和乙烷反应。 NI和PD装载了钻石AF…更多释放了大量碳纳米纤维。在Ni-Loaded情况下，用甲烷和600℃以相似性获得了最大的碳速率，并且在两个碳氢化合物中没有观察到650℃时观察到纳米纤维的形成。无论反应温度如何，在CO和FE装载的钻石上获得了非常少量的碳纳米纤维。在1000℃的Fe负载钻石上，通过TEM观察获得了很少的单壁碳纳米管直接粘合到钻石表面。在对比度中，在PD负载的碳纳米纤维下，在500至800℃的较高温度下产生了碳纳米纤维，即使以800 r量产生了大量的碳纳米纤维，也可以从800 cy中产生。此外，在800℃时，作为碳源在PD负载的钻石催化剂上，非常厚的碳纤维是由最初产生的薄碳纤维的组合产生的。金属催化的碳纳米纤维生长机制是通过澄清的氢碳含量分解的，并且这种降低的含水量和生长条件的降低了。较少的