Graphite Electrodes Containing Nanometer-Sized Metal Particles and Their Use in the Synthesis of Single-Walled Carbon Nanotube Composites
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- 作者：Alan M. Cassell ; Walter A. Scrivens ; and James M. Tour
- 刊名：Chemistry of Materials
- 出版年：1996
- 出版时间：July 1996
- 年：1996
- 卷：8
- 期：7
- 页码：1545 - 1549
- 全文大小：205K
- 年卷期：v.8,no.7(July 1996)
- ISSN：1520-5002
文摘
Composite graphite/metal(0) electrodes wereprepared by the absorbtion of organic solutionsof metal carbonyls or aqueous solutions of metal salts into high-purityporous graphite rods.The metal carbonyls were converted to the CO-free metal(0)species by heating the compositesunder an atmosphere of N2 and then under reduced pressureat 1000 
deg.gif">C. The metal-salt-containing graphite rods were heated under an atmosphere ofH2 at 1000 deg.gif">C to reduce thesalts to the corresponding metal(0) species. This procedurepermitted dispersion of metal(0) throughout the graphite rod with average metal particle sizes in therange 6.2-11.6 nmby transmission electron microscopy (TEM) analysis. Metals usedwere Ag, Co, Cu, Fe, La,Ni, and Pt. The composite graphite/metal(0) electrodes werevaporized in a plasma dischargeapparatus under a helium atmosphere. The Co, Fe, Ni, and Pt allcatalyzed single-wallednanotubule (bucky tube) growth. The soot material from the Co, Fe,and Ni-containing rodshad a foam-rubber-like texture. All the metal-containing soots,except for the La-derivedmaterial, could be press molded into pellets, without the use of abinder. Data from thetrace remaining ligand analyses, powder X-ray diffraction, TEM,conductivity measurements,and surface area analyses are presented. The properties of thearc-derived soots preparedby this method are compared to the soots prepared by standard coredrod/metal(0) methods.
deg.gif">C. The metal-salt-containing graphite rods were heated under an atmosphere ofH2 at 1000 deg.gif">C to reduce thesalts to the corresponding metal(0) species. This procedurepermitted dispersion of metal(0) throughout the graphite rod with average metal particle sizes in therange 6.2-11.6 nmby transmission electron microscopy (TEM) analysis. Metals usedwere Ag, Co, Cu, Fe, La,Ni, and Pt. The composite graphite/metal(0) electrodes werevaporized in a plasma dischargeapparatus under a helium atmosphere. The Co, Fe, Ni, and Pt allcatalyzed single-wallednanotubule (bucky tube) growth. The soot material from the Co, Fe,and Ni-containing rodshad a foam-rubber-like texture. All the metal-containing soots,except for the La-derivedmaterial, could be press molded into pellets, without the use of abinder. Data from thetrace remaining ligand analyses, powder X-ray diffraction, TEM,conductivity measurements,and surface area analyses are presented. The properties of thearc-derived soots preparedby this method are compared to the soots prepared by standard coredrod/metal(0) methods.