Carbon nanocapsules and single‐layered nanotubes produced with platinum‐group metals (Ru, Rh, Pd, Os, Ir, Pt) by arc discharge
Carbon nanocapsules and single‐layered nanotubes produced with platinum‐group metals (Ru, Rh, Pd, Os, Ir, Pt) by arc discharge
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DOI：
10.1063/1.363166
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发表时间：
1996-09
影响因子：
3.2
通讯作者：
Y. Saito;K. Nishikubo;K. Kawabata;Takehisa Matsumoto
中科院分区：
文献类型：
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作者：
Y. Saito;K. Nishikubo;K. Kawabata;Takehisa Matsumoto
研究了将铂族金属(Ru、Rh、Pd、Os、Ir、Pt)包覆在碳纳米胶囊中，并通过电弧蒸发金属/碳复合材料制备单层(SL)碳纳米管。透射电子显微镜显示，所有铂族金属都被包裹在多层石墨笼子中，形成了直径为10-200 nm的小颗粒。笼子中捕获的颗粒为正常金属相中的单畴微晶。Rh、Pd和Pt对生长SL碳管具有催化活性，而其他金属则没有。Rh和Pd的金属颗粒径向挤压出直径1.3~1.7 nm的致密SL管束，Rh和Pd的核心颗粒尺寸分别为20~30 nm和50~200 nm。在铂的情况下，一个或几个SL管(通常直径为1.32.0 nm，有时为∼3 nm)从微小的颗粒(∼10 nm)生长。
Encapsulation of platinum‐group metals (Ru, Rh, Pd, Os, Ir, Pt) within carbon nanocapsules and synthesis of single‐layered (SL) carbon nanotubes by arc evaporation of metal/carbon composites have been studied. Transmission electron microscopy revealed that all the platinum‐group metals, forming small particles (10–200 nm in diameter), were encapsulated within multilayered graphitic cages. Particles trapped in the cages were single‐domain crystallites in normal metallic phases. Rh, Pd, and Pt showed catalytic activity for growing SL carbon tubes, but the other metals did not. Bundles of dense SL tubes with diameter 1.3–1.7 nm were extruding radially from metal particles for Rh and Pd; the sizes of core particles were 20–30 nm for Rh, and 50–200 nm for Pd. In the case of Pt, one or a few SL tubes (typically 1.3–2.0 nm in diameter and sometimes ∼3 nm) grew from a tiny particle (∼10 nm).