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A Novel Class of Carbon Nanocones

Published online by Cambridge University Press:  15 March 2011

Svetlana Dimovski ,
Joseph A. Libera  and
Yury Gogotsi
Svetlana Dimovski
Affiliation:
Department of Materials Engineering, Drexel University, Philadelphia, PA 19104, U.S.A.
Joseph A. Libera
Affiliation:
Mechanical Engineering Department, University of Illinois at Chicago, Chicago, IL 60607, U.S.A.
Yury Gogotsi
Affiliation:
Department of Materials Engineering, Drexel University, Philadelphia, PA 19104, U.S.A. Mechanical Engineering Department, University of Illinois at Chicago, Chicago, IL 60607, U.S.A.
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Abstract

A new class of low-angle conical carbon crystals has been described and their characteristics are reported here. These carbon nanocones were found in pores of a glassy carbon (GC) along with cylindrical multiwall nanotubes and graphite polyhedral crystals. The largest cones reach 2 to 3 microns in length, although most are in the submicron range. Scanning Electron Microscopy (SEM) reveals cones protruding from the inner pore surfaces with the tips oriented toward the inside of the pores. Transmission Electron Microscopy (TEM) and Selected Area Electron Diffraction (SAED) show that cones are made of thick (up to several hundred layers), highly-ordered graphitic walls. Their tips are graphitic as well, and exhibit a dome-like morphology. These cones also differ from any carbon cones observed earlier in that they have a much smaller apex angle, sometimes less than 3°. Small angle carbon nanocones can potentially be used for probes and field emission elements.

Type
Article
Information
MRS Online Proceedings Library (OPL) , Volume 706: Symposium Z – Making Functional Materials with Nanotubes , 2001 , Z6.27.1
Copyright
Copyright © Materials Research Society 2002

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