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Issue 7, 2011
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Chromium nitride and carbide nanofibers: from composites to mesostructures

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Abstract

This work describes an easy two-step approach for metal nitride/carbide nanocomposite ceramic nanofibers via heat treatment of electrospun precursor fibers. Possibilities to tune their composition, carbon scaffold organization and texture depend on the calcination temperature, and yield two different types of fiber structures. Fiber mats with various morphologies were obtained from polyacrylonitrilechromium chloride precursor electrospun fibers, while well defined rod-like fiber non-woven mats were obtained when a methylated polyurea was used as an additive to the previous system. It was observed that the use of a two component organic system, involving a fiber stabilizing polymeric template (PAN) and a specific nitrogen/carbon donor (PUF), enables to maintain the morphology of the initial fibers during heat treatment and prevents the system from forming sintered membranes at high humidity conditions. The chromium content found for PAN-free and PAN-containing was 9 and 12 wt%, respectively. Moreover, thermal treatment at temperatures higher than 1000 °C led to graphitization of the carbon subphase of both series. Nitrogen sorption studies revealed that the graphitization process increases the specific surface area of the fibers, which possess a pore system with a wide diameter distribution and inkbottle-shaped pores. Conductivity studies revealed that the fiber systems are suitable for electrochemical applications.

Graphical abstract: Chromium nitride and carbide nanofibers: from composites to mesostructures

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Supplementary files

Article information


Submitted
10 Aug 2010
Accepted
11 Nov 2010
First published
15 Dec 2010

J. Mater. Chem., 2011,21, 2136-2143
Article type
Paper

Chromium nitride and carbide nanofibers: from composites to mesostructures

A. García-Márquez, D. Portehault and C. Giordano, J. Mater. Chem., 2011, 21, 2136
DOI: 10.1039/C0JM02612C

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