Catalyst-Assisted Pyrolysis of Polymeric Precursors: A New Method to Synthesize Low-Dimensional Nanomaterials

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Periodical:

Key Engineering Materials (Volumes 336-338)

Edited by:

Wei Pan and Jianghong Gong

Pages:

2138-2141

DOI:

10.4028/www.scientific.net/KEM.336-338.2138

Citation:

W. Y. Yang et al., "Catalyst-Assisted Pyrolysis of Polymeric Precursors: A New Method to Synthesize Low-Dimensional Nanomaterials", Key Engineering Materials, Vols. 336-338, pp. 2138-2141, 2007

Online since:

April 2007

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$35.00

[6] .

[8] Here, we focused on the issue why the wire-, belt- and rod-shaped nanostructures formatted. It was believed that the pyrolysis temperature was the determined factor for the formation of variously shaped nanomaterials. The solution amount of Si and C elements to the liquid alloy was different at various temperatures, which resulted in the different sizes of the liquid alloys. The smaller liquid droplet formed at the low temperature limited the earlier stage growth of the nuclei along width and thickness directions by size confining effect, thus nanowires instead of nanobelts were formed. In contrast, the larger droplet formed at a relatively higher temperature favored the anisotropy growth along the width and thickness directions and leaded to the formation of beltlike nanostructures. The rodlike nanostructures formation could be due to the enough large size of the droplet formed at 1700 o C which allowed the same growth along the width and thickness directions. Summary In summary, we reported a new method named catalyst-assisted pyrolysis of polymeric precursor to synthesize single-crystalline low-dimensional nanomaterials in various morphologies such as Si3N4 nanowires, Si3N4 nanobelts and SiC nanorods with the growth directions as.

DOI: 10.1016/j.physe.2008.09.012

[100] .

[101] and.

[100] and.

[111] respectively. The mechanisms are proposed as SLGS, SLGS and SLS for the Si3N4 nanowire, Si3N4 nanobelts and SiC nanorods growth, respectively. Fabrication of nanostructures in various materials systems could be promised via this method by tailoring the composition of the raw polymeric precursor at the atomic level. Acknowledgments The authors were thankful for support from the National Natural Science Foundation of China (Grant No. 50372031) and the two basics project. References.

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