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Chemical Precursor Routes to Nanostructured Non-oxide Ceramics

Published online by Cambridge University Press:  01 February 2011

Kersten M. Forsthoefel ,
Mark J. Pender  and
Larry G. Sneddon
Kersten M. Forsthoefel
Affiliation:
Department of Chemistry, University of Pennsylvania, Philadelphia, PA 19104-6323, U.S.A.
Mark J. Pender
Affiliation:
Department of Chemistry, University of Pennsylvania, Philadelphia, PA 19104-6323, U.S.A.
Larry G. Sneddon
Affiliation:
Department of Chemistry, University of Pennsylvania, Philadelphia, PA 19104-6323, U.S.A.
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Abstract

An efficient route to boron carbide, boron nitride, and silicon carbide ceramic nanofibers and nanotubules has been developed which employs newly developed molecular and polymeric precursors in conjunction with porous alumina templating methods. Melt infiltration or vacuum filtration of solutions of 6,6 -(CH2)6-(B10H13)2 or polyhexenyldecaborane through alumina templates followed by pyrolysis and dissolution of the membranes in 48% HF yielded boron carbide nanofibers or nanotubules. Boron nitride nanotubules were generated in a similar fashion by employing polyborazylene as a precursor, while silicon carbide nanotubules were generated from the commercially available allylhydridopolycarbosilane (AHPCS) polymeric precursor. In all cases, SEM and TEM analyses showed aligned, monodispersed ensembles of nanofibers or nanotubules. Structural control of the end products can be achieved through changes in concentration of the precursor solution, the number of alumina membrane treatments, and/or pore size of the alumina template.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 728: Symposium S – Functional Nanostructured Materials through Multiscale Assembly and Novel Patterning Techniques , 2002 , S8.18
Copyright
Copyright © Materials Research Society 2002

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