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United States Patent 5,457,343
Ajayan, et. al.Oct. 10, 1995

Carbon nanotubule enclosing a foreign material

Inventors: Ajayan; Pulickel M. (Tokyo, JP); Iijima; Sumio (Tokyo, JP).
Assignee: NEC Corporation (Tokyo, JP).
Appl. No.: 170,806
Filed: Dec. 21, 1993

Foreign Application Priority Data
Dec. 22, 1992 [JP]4-341747
Intl. Cl.:H01L 29/41; H01L 29/43; D01F 9/12
U.S. Cl.:257/734; 257/741; 257/746; 423/447.2; 423/DIG.39; 423/DIG.40
Field of Search:257/734, 741-742, 1-4, 746; 422/312; 423/447.2, DIG. 39, DIG. 40; 428/367, 371, 376, 377

References Cited

U.S. Patent Documents
5,346,683Sept., 1994Green et al. 423/447.2

Other References

Primary Examiner: Mintel; William
Assistant Examiner: Brown; Peter Toby
Attorney, Agent or Firm: Young & Thompson

Abstract

The invention provides a nanometer sized carbon tubule enclosing a foreign material except for carbon. The carbon tubule comprises a plurality of tubular graphite monoatomic sheets coaxially arranged. The foreign material is introduced through a top portion of the carbon tubule. The introduction of the foreign material is accomplished after forming an opening at the top portion of the carbon tubule either by contacting the foreign material with the top portion of the carbon tubule together with a heat treatment or by an evaporation of the foreign material on the top portion of the carbon tubule together with the heat treatment. The foreign material is introduced only in a center hollow space defined by an internal surface of the most inner tubular graphite monoatomic sheet.

2 Claims, 3 Drawing Figures


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