CVD method of producing and doping fullerenes
First Claim
1. A method of producing fullerenes using an electrically heated metal filament to deposit soot containing fullerenes on a substrate within a Chemical Vapor Deposition chamber, comprising the steps of:
- (a) feeding and mixing, under fullerene growth conditions to increase the yield of fullerenes-containing soot, approximately 0.5 to 2% CH4 gas with approximately 98 to 99.5% H2 gas into a Chemical Vapor Deposition chamber containing a substrate and a metal filament;
(b) raising the temperature of the metal filament in the chamber to approximately 2200 degrees C.;
(c) maintaining the temperature of the substrate to be between approximately 900 to 950 degrees C.;
(d) collecting soot from the substrate in the chamber; and
(e) extracting fullerenes from the collected soot.
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Abstract
Methods of producing fullerenes in large-macroscopic quantities inexpensively is disclosed without using solid carbon material such as graphite. In a preferred embodiment, fullerenes are formed by a hot filament CVD procedure. The fullerenes occur in the soot that forms as a by-product on the edges of the substrate holder. Mass spectrum of soot deposits shows lines corresponding to C60. From the typical concentrations of gaseous species in the diamond-growing CVD chamber, hydrocarbon species including CH3 or C2 H2 can be the precursors for the formation of fullerenes in the CVD chamber. A method of using fullerenes to enhance the properties of rubber composites is also described.
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Citations
15 Claims
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1. A method of producing fullerenes using an electrically heated metal filament to deposit soot containing fullerenes on a substrate within a Chemical Vapor Deposition chamber, comprising the steps of:
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(a) feeding and mixing, under fullerene growth conditions to increase the yield of fullerenes-containing soot, approximately 0.5 to 2% CH4 gas with approximately 98 to 99.5% H2 gas into a Chemical Vapor Deposition chamber containing a substrate and a metal filament; (b) raising the temperature of the metal filament in the chamber to approximately 2200 degrees C.; (c) maintaining the temperature of the substrate to be between approximately 900 to 950 degrees C.; (d) collecting soot from the substrate in the chamber; and (e) extracting fullerenes from the collected soot. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of producing fullerenes using an electrically heated metal filament and a substrate within a Chemical Vapor Deposition chamber, comprising the steps of:
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(a) providing a current maintained at approximately 30 to 100 A to a tungsten filament within a Chemical Vapor Deposition chamber; (b) feeding and mixing, under fullerene growth conditions to increase the yield of fullerenes-containing soot, approximately 0.5 to 2% CH4 gas and approximately 98 to 99.5% H2 gas to the chamber; (c) maintaining the temperature of a silicon substrate in the chamber to be approximately 900 to 950 degrees C.; (d) collecting soot from the substrate in the chamber; and (e) extracting fullerenes from the collected soot. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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Specification