刘霞,曹连振,蒋红,宋航.SiC/SiO2核壳结构纳米线制备及光学性质研究[J].光电子激光,2014,(6):1115~1118 |
SiC/SiO2核壳结构纳米线制备及光学性质研究 |
Synthesis and photoluminescence propoerties of the SiC/SiO2core-shell nanowires |
投稿时间:2014-01-08 |
DOI: |
中文关键词: SiC SiO2 核壳结构 光致发光(PL) |
英文关键词:SiC SiO2 core-shell photoluminescence (PL) |
基金项目:国家自然科学基金(11174224)、山东省高校科技发展计划(J13LJ54)和山东省 科技发展计划(2013YD01016)资助项目 (1.潍坊学院 物理与光电工程学院,山东省多光子纠缠与操纵重点实验室,山东潍坊261061;2.中国科学院长春光学精密机械与物理研究所,吉林 长春 130033) |
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中文摘要: |
采用简单的气固反应,在Si衬底上成功制备了SiC 一维纳米材料。用扫描电子显微镜(SEM)、透射电子显微镜(TEM) 、X射线电子能谱(EDX)、 X射线衍射谱(XRD)和光致发光谱(PL)等手段研究了材料的表面形貌、结构 组成和光学性质。研究结果表明,制备的纳米材料为SiC/SiO2核壳 结构纳米线,在室温时发射中心波长分别为380nm和505nm的紫外峰 和绿光带。经分析认为,波长380nm的紫外峰来源于SiO2中的O空 位缺陷;而中 心波长505nm的绿光带则来源于受量子尺寸效应影响并包覆了SiO2外壳的SiC内核。 |
英文摘要: |
Due to the indirect band gap structure,the light emission efficiency of SiC materials is usually very low,which limits the applications of SiC in optoelect ronic devices.A lot of methods have been employed to improve the light emission efficiency of SiC materials,of which synthesizing SiC nano-structure materials would be an effective way.In our work,SiC/SiO2core-shell nanowires were synthesize d on Si (100) substrate by the reaction of methane with silicon dioxide using iron as catalyst.The structural properties of the nanowires are characterized by scanni ng electron microscopy (SEM),transmission electron microscopy (TEM) and X-ray diff raction (XRD).It can be seen that the nanowires have a diameter about 50nm and length about 10μm,a nd the nanowires consist of a 30nm single-crystal β-SiC core and a 10nm amorphous SiO2shell.The light-emitting properties of nanowires are studied by photoluminescence spectroscopy.A sharp ultraviolet peak at 380nm and an intens ive broad green band with defined maximum peak at 505nm are observed in PL spectra of as-grown nanowires.According to analysis,the ultraviolet peak originates f rom the oxygen-vacancy defects in the SiO2shell and the broad green band comes from the SiC cores caused by quantum confinement effect. |
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