Synthesis and Analysis of a New Silica Nanowire Periodically Wrapped by Nano-spheres

doi:10.15541/jim20150512

Abstract

Abstract:

Lawn-like nanowire arrays silica nanowires were grown on graphite substrate by thermal evaporation of silicon powders using vapor from melted CaCl₂ as carrier at 1300℃. A series of analysis technique were employed to investigate the as-grown nanowires. The results show that the as-grown silica nanowires are in length of several micron-meters with the diameter ranging from 50-400 nm, which is identified to be face-centered cubic structure. Systematic analyses reveal that the growth models such as classic vapor-liquid-solid(VLS) model are not applicable to explain the growth of silica nanowire periodically wrapped by nano-spheres. Hereby, an extended VLS model is proposed which can perfectly interpret the silica nanowires’ growth on graphite surface.

Key words: silica nanowire, thermal evaporation, lawn-like, growth mechanism

CLC Number:

O643
TB383

MA Hong-Bing, BAI Hua, XUE Chen, TAO Peng-Fei, XU Qun-Feng, JIANG Nan. Synthesis and Analysis of a New Silica Nanowire Periodically Wrapped by Nano-spheres[J]. Journal of Inorganic Materials, 2016, 31(5): 523-528.

Figures/Tables 7

Fig. 1 XRD pattern of the product

Fig. 2 SEM images of the product deposited on graphite paper (a) Lawn-like nanowires (300×); (b) Bead-like nanowires (2400×); (c) EDS pattern of “1 area” in (b)

Fig. 3 TEM images of SiO2 nanowires (a) Morphology of the bead-like of single nanowires; (b) Diffraction pattern of A spot in (a); (c) EDS pattern of A spot in (a)

Fig. 4 Raman spectrum of silica nanowires

Fig. 5 XPS spectra of SiO2 nanowires (a) Full spectra; (b) Si2p; (c) C1s; (d) O1s

Fig. 6 BET fitting line of (a) graphite flake with SiO2 nanowires grown on the surface, (b) the graphite flake heat-treated at 1300℃

Fig. 7 Schematic description for the growth of silica nanowires on the graphite surface

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