Structural characterization of mesoporous silica nanowire arrays grown in porous alumina templates
Structural characterization of mesoporous silica nanowire arrays grown in porous alumina templates
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DOI：
10.1016/j.cplett.2005.05.002
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发表时间：
2005-06-30
影响因子：
2.8
通讯作者：
Wang, N
中科院分区：
文献类型：
--
作者：
Jin, KW;Yao, BD;Wang, N
在不同老化条件下，采用溶胶-凝胶法在多孔阳极氧化铝（AAO）模板孔内制备了有序介孔二氧化硅纳米线（NW）阵列。高分辨率透射电镜研究表明，纳米二氧化硅的结构对模板结构和老化环境非常敏感。对于存在水的老化样品，发现二氧化硅NWs中的所有纳米通道都围绕NW轴呈圆形。然而，对于无水时效的样品，由于AAO孔壁的限制作用，大多数二氧化硅NWs具有管状结构。在大的AAO孔中形成的管状二氧化硅NWs通常由壳包裹的核（平行于NW轴的六边形纳米通道）组成。提出并讨论了这些新型介孔二氧化硅NWs结构的形成机理。(c) 2005 Elsevier B.V.版权所有
Highly ordered mesoporous silica nanowire (NW) arrays were fabricated inside the pores of porous anodic aluminum oxide (AAO) templates using a simple sol-gel method at different aging conditions. High-resolution transmission electron microscopy investigation shows that the structure of silica NWs is sensitive to the template structure and aging environment. For the samples aged with the presence of water, all the nanochannels in the silica NWs were found to be circular around the NW axes. However, for those samples aged without water, most silica NWs have a tube-like structure due to the confinement effect of the AAO pore-walls. Those tube-like silica NWs formed in large AAO pores generally consist of a core (hexagonally arranged nanochannels parallel to the NW axis) wrapped by shells. The formation mechanism for these novel structures of mesoporous silica NWs were proposed and discussed. (c) 2005 Elsevier B.V. All rights reserved.