SiC nanowires with thickness-controlled SiO2 shells： Fabrication, mechanism, reaction kinetics and photoluminescence properties

SiC nanowires with thickness-controlled SiO2 shells have been obtained by a simple and efficient method, namely treatment of SiC/SiO2 core-shell nanowires in NaOH solution. The products were characterized by transmission electron microscopy （TEM）, high-resolution transmission electron microscopy （HR...

Full description

Saved in:
Bibliographic Details
Published in:Nano research 2014-04, Vol.7 (4), p.462-472
Main Authors: Li, Zhenjiang, Zhao, Jian, Zhang, Meng, Xia, Jiyin, Meng, Alan
Format: Article
Language:English
Subjects:
Advanced manufacturing technologies
Atomic/Molecular Structure and Spectra
Biomedicine
Biotechnology
Chemistry and Materials Science
Condensed Matter Physics
Electrons
Experimental methods
Fabrication
Fourier transforms
Materials Science
Nanotechnology
Nanowires
NaOH溶液
Protective coatings
Research Article
Sodium hydroxide
Spectroscopy
Transmission electron microscopy
X-ray diffraction
二氧化硅涂层
光致发光性质
厚度控制
反应动力学
硅纳米线
纳米碳化硅
高分辨透射电子显微镜
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:SiC nanowires with thickness-controlled SiO2 shells have been obtained by a simple and efficient method, namely treatment of SiC/SiO2 core-shell nanowires in NaOH solution. The products were characterized by transmission electron microscopy （TEM）, high-resolution transmission electron microscopy （HRTEM）, X-ray diffraction （XRD）, Raman spectroscopy, infrared （IR） spectroscopy, and photoluminescence spectroscopy. The thickness of the SiO2 shell can be effectively controlled by selecting the appropriate processing time, and pure SiC nanowires were also obtained by alkaline cleaning in 1 mol-L-1 NaOH solution for 40 min at 70 ~C. A mechanism for the removal of the SiO2 shells has been proposed, and a two-phase reaction kinetic equation was derived to explain the rate of the removal of the SiO2 shells. The validity of this equation was verified by experiment. This work not only describes an effective experimental method for achieving SiC nanowires with thickness-controlled SiO2 coatings but also provides a fundamental theoretical equation with a certain level of generality. In addition, photoluminescence （PL） measurement results showed that the SiC nanowires sheathed with an optimum SiO2 thickness （3.03 nm） have better photoluminescence properties than either the bare SiC nanowires or SiC nanowires with thicker coatings of SiO2.
ISSN:1998-0124
1998-0000
DOI:10.1007/s12274-014-0413-3