0185342 - UJF-V 20010069 RIV US eng J - Článek v odborném periodiku
Zhang, Z. J. - Ajayan, P. M. - Ramanath, G. - Vacík, Jiří - Xu, Y. H.
Growth, structure, and optical properties of carbon-reinforced silica fibers.
Applied Physics Letters. Roč. 78, č. 24 (2001), s. 3794-3796. ISSN 0003-6951. E-ISSN 1077-3118
Grant CEP: GA AV ČR KSK1010104
Kód oboru RIV: BG - Jaderná, atomová a mol. fyzika, urychlovače
Impakt faktor: 3.849, rok: 2001

We report the synthesis of carbon-reinforced silica fibers by methane exposure of metallocenetreated oxidized-Si(001) substrates at 1100 degreesC. The SiO2 cap layer transforms into silica fibers reinforced by glassy carbon in the core during methane exposure. High-resolution electron microscopy and spatially resolved spectroscopy measurements of the fibers reveal an amorphous structure without a hollowand domains of glassy carbon embedded at the fiber core. The carbon-reinforced fibers are optically transparanet andhave an optical band gap of similar or equal to 3.1 eV. These fibers are organized in radial patterns that vary for different metallocene species. On nickelocene-treated sub strates, the fibers originate from the circumference of the circumference of the circular templates and grow outwards, forming radial patterns. On ferrosene-treated substrates, randomly oriented fibers grow within as well as slightlyoutside the perimeter of the templates, forming wreath-likepatterns. Aligned growth of such fibers could be useful forfabricating optoelectronics devices and reinforced composites.
Trvalý link: http://hdl.handle.net/11104/0081741