摘要
用简单的水热法,在ZnO种晶层修饰的玻璃基底上生长取向性较好的ZnO纳米棒阵列,之后通过质量分数较低的氨水侵蚀获得了ZnO纳米管。采用X射线衍射仪(XRD)、场发射扫描电子显微镜(FESEM)及光致发光光谱仪(PL)对产物的结构、形貌以及光学特性进行表征。结果表明,ZnO纳米管为沿c轴方向择优生长的六方晶型纤锌矿结构,外直径约为500 nm,管壁厚度约为40 nm,而且缺陷发光峰的强度明显高于本征紫外发光峰。此外,在100 W的紫外汞灯照射下对ZnO纳米管阵列的一阶光催化速率常数特性进行了研究,发现随着ZnO纳米管薄膜用量的不断增大,光催化速率常数也随之增大,两者呈正比例关系。
Highly oriented ZnO nanorod arrays were prepared via a simple hydrothermal process on the glass substrate decorated by ZnO seed layer,and then the ZnO nanotubes were obtained by chemically etching the ZnO nanorods in the ammonium hydroxide solution with low mass fraction.The structure,morphology and optical property of the as-prepared products were characterized by the X-ray diffractometer（XRD）,field emission scanning electron microscopy（FESEM）and photoluminescence（PL）spectroscopy,respectively.The results show that the ZnO nanotubes are of hexagonal wurtzite structure and grow preferentially along the c-axis direction.The outer diameter and wall thickness of the ZnO nanotubes are about 500 nm and40 nm,respectively.The emission intensity of the defect peak revealed by the PL spectrum was much higher than that of the ultraviolet intrinsic luminescent peak.Furthermore,the first-order photocatalytic rate constant property of the ZnO nanotube arrays under the illumination of a 100 W ultraviolet highpressure mercury lamp was investigated.It is found that the photocatalytic rate constant increases linearly with the increase of the dosage of the ZnO nanotube film,i.e.the photocatalytic rate constant is proportional to the dosage of the ZnO nanotube film.
出处
《微纳电子技术》
北大核心
2016年第2期124-128,134,共6页
Micronanoelectronic Technology
基金
国家自然科学基金资助项目(11304025
11574036)
关键词
ZNO
纳米管
酸碱腐蚀法
光致发光
光催化
ZnO
nanotube
acid-alkali etching method
photoluminescence
photocatalysis
