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Large-scale Synthesis of β -SiC Nanochains and Their Raman/Photoluminescence Properties

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ABSTRACT

Although the SiC/SiO2 nanochain heterojunction has been synthesized, the chained homogeneous nanostructure of SiC has not been reported before. Herein, the novel β-SiC nanochains are synthesized assisted by the AAO template. The characterized results demonstrate that the nanostructures are constructed by spheres of 25–30 nm and conjoint wires of 15–20 nm in diameters. Raman and photoluminescence measurements are used to explore the unique optical properties. A speed-alternating vapor–solid (SA-VS) growth mechanism is proposed to interpret the formation of this typical nanochains. The achieved nanochains enrich the species of one-dimensional (1D) nanostructures and may hold great potential applications in nanotechnology.

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Raman spectra of the SiC nanochains.
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Figure 7: Raman spectra of the SiC nanochains.

Mentions: A typical Raman spectrum of as-achieved SiC nanochains is shown in Figure 7. Two feature peaks at around 783 and 930 cm-1 could be assigned to the TO and LO phonon peaks of cubic SiC crystal, respectively, and a shift of 13 cm-1 and 42 cm-1 are observed comparing with the modes of bulk SiC [32,33]. When compared with that of SiC whisker, a shift of 11 cm-1 is observer for the TO peak [34]. The unique physical properties may be caused by the size confinement effect, inherent stacking faults, and novel chained morphology of SiC nanostructures [35]. Otherwise, slight alloying may be also the reasons to the peaks shift of the Raman spectrum.


Large-scale Synthesis of β -SiC Nanochains and Their Raman/Photoluminescence Properties
Raman spectra of the SiC nanochains.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211428&req=5

Figure 7: Raman spectra of the SiC nanochains.
Mentions: A typical Raman spectrum of as-achieved SiC nanochains is shown in Figure 7. Two feature peaks at around 783 and 930 cm-1 could be assigned to the TO and LO phonon peaks of cubic SiC crystal, respectively, and a shift of 13 cm-1 and 42 cm-1 are observed comparing with the modes of bulk SiC [32,33]. When compared with that of SiC whisker, a shift of 11 cm-1 is observer for the TO peak [34]. The unique physical properties may be caused by the size confinement effect, inherent stacking faults, and novel chained morphology of SiC nanostructures [35]. Otherwise, slight alloying may be also the reasons to the peaks shift of the Raman spectrum.

View Article: PubMed Central - HTML - PubMed

ABSTRACT

Although the SiC/SiO2 nanochain heterojunction has been synthesized, the chained homogeneous nanostructure of SiC has not been reported before. Herein, the novel β-SiC nanochains are synthesized assisted by the AAO template. The characterized results demonstrate that the nanostructures are constructed by spheres of 25–30 nm and conjoint wires of 15–20 nm in diameters. Raman and photoluminescence measurements are used to explore the unique optical properties. A speed-alternating vapor–solid (SA-VS) growth mechanism is proposed to interpret the formation of this typical nanochains. The achieved nanochains enrich the species of one-dimensional (1D) nanostructures and may hold great potential applications in nanotechnology.

No MeSH data available.