Wang Xuehua, Li Chengyong, Ma Lianjiao, Cao Hong
School of Materials Science and Engineering, Wuhan Institute of Technology, Wuhan 430073, China.
J Nanosci Nanotechnol. 2010 Mar;10(3):1846-51. doi: 10.1166/jnn.2010.2117.
Alumina nanostructures, nanowires, and semicolumn nanotubes with high aspect ratios were synthesized by the chemical etching of porous alumina membranes (PAMs) in phosphoric acid solution. The morphology and structure of alumina nanostructures were analyzed by scanning electron microscopy (SEM), energy dispersive spectrum (EDS), and X-ray diffraction (XRD), respectively. The results showed that the typical features of highly flexible nanostructures were around 20-40 nm in diameter and around 100 microm in length. EDS analysis indicated that the nanostructures were constructed by aluminum oxide. The crystalline structure of the alumina nanostructures was amorphous, which was in accordance with that of the PAMs. Furthermore, the morphology of the PAMs was characterized in detail by atomic force microscope (AFM) and SEM. On the basis of AFM and SEM observations, a possible formation mechanism of alumina nanostructures was discussed, and the inhomogeneous dissolution between the triple points and the side walls was considered to be the essential factor deciding the formation of nanostructures.
通过在磷酸溶液中对多孔氧化铝膜（PAM）进行化学蚀刻，合成了具有高纵横比的氧化铝纳米结构、纳米线和半柱状纳米管。分别通过扫描电子显微镜（SEM）、能量色散谱（EDS）和X射线衍射（XRD）对氧化铝纳米结构的形貌和结构进行了分析。结果表明，高度柔性纳米结构的典型特征是直径约为20 - 40纳米，长度约为100微米。EDS分析表明，纳米结构由氧化铝构成。氧化铝纳米结构的晶体结构为非晶态，这与PAM的晶体结构一致。此外，通过原子力显微镜（AFM）和SEM对PAM的形貌进行了详细表征。基于AFM和SEM的观察结果，讨论了氧化铝纳米结构可能的形成机制，并且认为三相点和侧壁之间的不均匀溶解是决定纳米结构形成的关键因素。
