Selective synthesis of semiconducting carbon nanotubes

US7038299B2 · kind B2 · utility

Assignee

• International Business Machines Corporation · US

Inventors

• Toshiharu Furukawa · South Burlington, US
• Mark C. Hakey · Saint Albans, US
• Steven J. Holmes · Colchester, US
• David V. Horak · South Burlington, US
• Charles W. Koburger, III · Delmar, US
• Peter H. Mitchell · Jericho, US
• Larry Nesbit · Farmington, US

Key dates

• Filing date: Dec 11, 2003
• Grant date: May 2, 2006
• Expiry date: Oct 14, 2024

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S977/854
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

Methods for selecting semiconducting carbon nanotubes from a random collection of conducting and semiconducting carbon nanotubes synthesized on multiple synthesis sites carried by a substrate and structures formed thereby. After an initial growth stage, synthesis sites bearing conducting carbon nanotubes are altered to discontinue synthesis at these specific synthesis sites and, thereby, halt lengthening of the conducting carbon nanotubes. Synthesis sites bearing semiconducting carbon nanotubes are unaffected by the alteration so that semiconducting carbon nanotubes may be lengthened to a greater length than the conducting carbon nanotubes.