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Crystalline silica nanowires

Published online by Cambridge University Press:  03 March 2011

F.L. Deepak ,
Gautam Gundiah ,
Md. Motin Seikh ,
A. Govindaraj  and
C.N.R. Rao
F.L. Deepak
Affiliation:
Chemistry and Physics of Materials Unit and CSIR Centre of Excellence in Chemistry, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O. Bangalore 560 064, India
Gautam Gundiah
Affiliation:
Chemistry and Physics of Materials Unit and CSIR Centre of Excellence in Chemistry, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O. Bangalore 560 064, India
Md. Motin Seikh
Affiliation:
Chemistry and Physics of Materials Unit and CSIR Centre of Excellence in Chemistry, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O. Bangalore 560 064, India
A. Govindaraj
Affiliation:
Chemistry and Physics of Materials Unit and CSIR Centre of Excellence in Chemistry, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O. Bangalore 560 064, India
C.N.R. Rao*
Affiliation:
Chemistry and Physics of Materials Unit and CSIR Centre of Excellence in Chemistry, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O. Bangalore 560 064, India
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

α-Cristobalite nanowires of 50–100 nm diameter with lengths of several microns have been synthesized for the first time by the solid-state reaction of fumed silica and activated charcoal. The nanowires have been characterized by x-ray diffraction, electron microscopy, photoluminescence, and Raman scattering. The nanowires are single crystalline as revealed by high-resolution electron microscope images. The crystalline nanowires are clad by an amorphous silica sheath when the carbon to fumed silica ratio in the starting mixture is small. Use of hydrogen along with Ar helps to eliminate the amorphous sheath.

Keywords

NanofiberTransmission electron microscopy (TEM)
Type
Rapid Communications
Information
Journal of Materials Research , Volume 19 , Issue 8 , August 2004 , pp. 2216 - 2220
Copyright
Copyright © Materials Research Society 2004

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