摘要
采用简单、低温的方法,在修饰过的Zn片上成功制备出具有高度取向的ZnO纳米棒阵列。用SEM、XRD和PL技术对制备出的ZnO纳米棒的结构和谱学特性进行了表征,并通过降解甲基橙溶液研究了其光催化活性。结果表明,ZnO纳米棒是六方钎锌矿磊,与基底垂直,具有沿(002)晶面择优生长的特征。统计结果显示,湿化学反应24h后90%以上的ZnO纳米棒直径为8O～140nm,长度为4μm。在PL谱中观察到3个荧光发射带,中心波长分别位于386nm的紫带、524nm的绿带和450～500nm附近的蓝带。ZnO纳米棒的光催化反应为一级反应,表观速率常数与甲基橙的初始浓度有关。
By using a simply and low-temperature wet-chemical method, ZnO nanorod array films with preferred orientation consistence are prepared on a zinc metal. Scanning electron microscopy （SEM）, X-ray diffraction （XRD） and Photoluminescence （PL） technique are used to characterize the ZnO nanorod arrays. The results show that ZnO nanorods are hexagonal wurtzite structures with highly oriented ZnO （002） crystal face,which indicate that as-prepared films were highly e-axis oriented. SEM images show that more than 90 % ZnO nanorods have diameter of 80 to 140nm and the typical length is about 4μm. Photoluminescence spectra of ZnO nanorod array films with excitation wavelength 350nm are measured at room temperature. Three emission bands are observed,one being a narrow violet band with central wavelength of 386nm and the other being wide visible bands with central wavelength of 524,450nm, respectively. Photo degradation of methyl orange in aqueous solution is investigated by using the ZnO nanorods as a photocatalyst. The photocatalytic reaction follows the first-order reaction kinetics and the constant of apparent rate is related to the initial concentration of methyl orange.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2007年第4期648-651,共4页
Journal of Functional Materials
基金
国家自然科学基金(201370201)
辽宁省科技基金(20022142)
关键词
ZNO纳米棒
晶面择优取向
锌片
光催化
甲基橙
ZnO nanorods
crystal face preferred orientation
zinc foils
photoeatalytic
methyl orange
