具有可逆蓝光发射特性的氧化硅纳米绳  

Silica Nanocords with Reversible Blue Light Emission

作　　者：郝玉峰[1,2] 孟国文[1] 张立德[1] 

机构地区：[1]中国科学院固体物理研究所,安徽合肥230031 [2]中国科学院研究生院,北京100039

出　　处：《纳米科技》2007年第2期46-50,共5页

摘　　要：研究了准一维氧化硅绳的生长机理以及对环境敏感的光致发光特性。实验采用化学气相沉积方法在水平管式炉中制备了具有绳索状的准一维氧化硅纳米结构。通过扫描电镜和透射电镜观察，发现这种非晶氧化硅纳米绳是由大量的氧化硅纳米线通过劈裂、粘连而成的自组织结构。反应中引入的水蒸气对产物的形貌和表面状态产生了重要影响。通过光致发光谱发现新鲜制备的氧化硅纳米绳有强烈的蓝光发射，经过潮湿环境处理后，其蓝光发射强度就会变得非常弱；当再把纳米绳经过干燥处理后，这种蓝色荧光强度几乎恢复到最初的水平。这种可逆的蓝色荧光现象有很好的重复性。结合红外光谱的研究，分析这种新奇的可逆发光现象是由氧化硅表面水分子的吸附、脱附造成的。Silica nanocords were synthesized by a simple chemical vapor deposition method in a horizontal tube furnace. The rope-like nanostrnctures were formed by splitting and connection of lots of amorphous silica nanowires. During the reaction, water vapor may take a vital effect on the product morphology and surface status. Blue light emission of these nanocords can dramatically be strengthened and weakened in the process of alternative dry and humid treatments. We propose that adsorbed-desorbed ambient water molecules on the nanocords surface are responsible for the reversible blue light emission behavior through analyzing photoluminescence and infrared spectra. Silica nanocords with such novel optical properties not only facilitate overall understanding of their structural features, but also find various applications related to environment-sensitivity.

关 键 词：氧化硅 纳米结构 蓝光 水分子 

分 类 号：TB34[一般工业技术—材料科学与工程]