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Browse Prior Art Database

Method for Producing Intercalated Fullerene Carbon Clusters

IP.com Disclosure Number: IPCOM000121695D
Original Publication Date: 1991-Sep-01
Included in the Prior Art Database: 2005-Apr-03
Document File: 2 page(s) / 58K

Publishing Venue

IBM

Related People

Bethune, DS: AUTHOR [+5]

Abstract

Disclosed is a method for producing the hollow carbon molecules known as fullerenes with internally caged atoms (intercalants). The intercalant is covaporized with the carbon and is incorporated in the fullerenes as the carbon condenses. The relative density of intercalant and carbon vapors can be adjusted to optimize the formation of intercalated species.

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Method for Producing Intercalated Fullerene Carbon Clusters

      Disclosed is a method for producing the hollow carbon
molecules known as fullerenes with internally caged atoms
(intercalants).  The intercalant is covaporized with the carbon and
is incorporated in the fullerenes as the carbon condenses.  The
relative density of intercalant and carbon vapors can be adjusted to
optimize the formation of intercalated species.

      Fullerenes form when carbon is vaporized in an inert atmosphere
[1-4].  In small quantities, intercalated fullerenes have been
produced using laser vaporization of intercalated graphite [5-7].  To
produce these species in larger quantities, it is necessary to
provide both high carbon densities (e.g., by arc, laser, or RF
induction heating of graphite) and a variable density of the desired
intercalant vapor.  This can be provided by feeding intercalant at a
controlled rate through a graphite tube or by packing a tube of
graphite with intercalant. Alternatively, the tubes could consist of
the intercalant with the carbon inside, or a heterogeneous rod could
be formed from a mixture of the two materials.  Separate adjacent
sources provide an additional means for achieving a mixed vapor.  In
all cases, the relative amounts of carbon and intercalant can be
varied either at the outset, or during vaporization, by controlling a
feed rate.  The rate of vapor cooling will also significantly affect
the probability of forming intercalated fuller...