Process for the simultaneous and selective preparation of single-walled and multi-walled carbon nanotubes

US7955663B2 · kind B2 · utility

Assignee

• COUNCIL OF SCIENTIFIC AND INDUSTRIAL RESEARCH · IN

Inventors

• Rakesh Mathur · Seattle, US
• Chhotey Lal Nil · New Delhi, IN
• Tersem Lal Dhami · New Delhi, IN
• Bhanu Pratap Singh · New Delhi, IN
• Anil Gupta · Chelmsford, US
• Jagdish Ghawana · New Delhi, IN

Key dates

• Filing date: Nov 5, 2007
• Grant date: Jun 7, 2011
• Expiry date: Aug 10, 2029

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S427/102
• WIPO field: Micro-structural and nano-technology
• WIPO sector: Chemistry

Abstract

Processes for the simultaneous and selective growth of single walled and multiwalled carbon nanotubes in a single set of experiments are disclosed. The processes may include preparing a graphite electrode rod containing catalyst selected from Fe, Co, Ni, and a mixture thereof, acting as an anode. The process may include preparing another graphite electrode rod, each electrode having a distal and a proximal end. The process may include placing the above said two electrodes parallel to each other and their axis being substantially aligned in a chamber. The process may further include creating a DC-arc discharge inside the chamber by applying a DC-current voltage. The process may further include an cooling assembly having a cooling coil that surrounds the two electrodes. The cooling assembly may be used to maintain a temperature gradient that permits the depositing of single walled and multiwalled carbon nanotubes simultaneously in one experiment.