Synthesis and Characterization of Mesostructured Tin Oxide with Crystalline Walls
Synthesis and Characterization of Mesostructured Tin Oxide with Crystalline Walls
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DOI：
10.1021/la971077c
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发表时间：
1998-03
期刊：
影响因子：
3.9
通讯作者：
L. Qi;Jiming Ma;Humin Cheng;Zhenguo Zhao
中科院分区：
文献类型：
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作者：
L. Qi;Jiming Ma;Humin Cheng;Zhenguo Zhao
在最初合成具有均匀孔径的硅基介孔分子材料（MCM-41）后不久，超分子模板方法被扩展到合成基于过渡族和主族金属氧化物的非硅基介孔材料，因为它们具有作为固体电解质器件、高表面积催化剂和吸附剂以及主客体化学的潜在应用W、Sb和Pb氧化物的介孔结构材料是首次报道的六方介孔相金属氧化物的例子随后，以Ti、6,7 Zr、8-10 Hf、11 V、12、13 Nb、14 Ta、15和Al16、17等多种金属氧化物为基体，通过不同的模板路线合成了三维介观结构。获得的介孔金属氧化物材料通常由无定形壁组成，尽管在某些情况下，如ZrO2的情况下，结构有序的壁可以形成。有人指出，由于许多应用需要具有特定晶体结构的晶体材料，因此合成具有所需晶体结构的介孔材料将是有利的近年来，合成了由Mn2O3和Mn3O4致密相微晶组成的六方介孔氧化锰，并将其表征为混合价半导体催化剂以其他金属氧化物为基材，采用超分子模板法合成具有结晶壁的介结构材料是值得探索的。氧化锡是一种宽能隙半导体，在有机氧化催化剂、固态气体传感器、光学电子器件等方面有着广泛的应用。21-23许多此类应用的成功依赖于具有均匀纳米级孔结构的SnO2晶体。因此，合成具有晶壁的介孔氧化锡具有工业价值。近年来，利用阴离子表面活性剂气溶胶OT （AOT）成功合成了以SnO2为基础的介孔相然而，得到的中孔SnO2没有被证明是由晶壁组成的。本文报道了以纳米晶esno2为壁材，具有四方锡石结构的介观结构氧化锡的合成。首次采用高分辨率透射电镜（HRTEM）直接观察了带晶壁的中间相的微观结构。
Shortly after the original synthesis of silica-based mesoporous molecular materials (MCM-41) with uniformly sized pores,1,2 the supramolecular templating approach was extended to the synthesis of non-siliceous mesoporousmaterials based onboth transition andmaingroup metal oxides because of their potential application as solid electrolyte devices, high surface area catalysts, and sorbents, as well as in host-guest chemistry.3,4 The mesostructured materials of the oxides of W, Sb, and Pb are among the first reported examples of hexagonal mesoporousphasesbasedonmetal oxides.5 Subsequently, three-dimensional mesostructures based on a variety of metal oxides such as the oxides of Ti,6,7 Zr,8-10 Hf,11 V,12,13 Nb,14 Ta,15 and Al16,17 were synthesized via various templating routes. The obtainedmesoporousmetal oxide materials usually consist of amorphous walls, although structurally ordered walls can form in certain cases such as the case of ZrO2. It has been pointed out that since manyapplications require crystallinematerials of specific crystalline structure, it would be advantageous to synthesize mesoporous materials with desired crystalline frameworks.18,19 Recently, hexagonal mesoporous manganese oxide with walls composed of microcrystallites of dense phases of Mn2O3 and Mn3O4 has been synthesized and characterized as mixed-valent semiconducting catalysts.20 It is worthwhile to explore the synthesis of mesostructuredmaterialswith crystallinewalls based on other metal oxides by means of supramolecular templating. Tin oxide is a kind of wide energy gap semiconductor and finds many technological applications such as catalysts for oxidation of organics, solid-state gas sensors, and optical electronic devices.21-23 The success in many of these applications relies on crystalline SnO2 with a uniform nanosize pore structure. Thus, synthesis of mesoporous SnO2 with crystalline walls would be of industrial interest. Recently, a mesoporous phase based on SnO2 has been successfully synthesized by using an anionic surfactant aerosol OT (AOT).7 However, the obtainedmesoporous SnO2 has not been shown to consist of crystalline walls. Here, we report on the synthesis of mesostructured tin oxide with walls composed of nanocrystallineSnO2with the tetragonal cassiterite structure. High-resolution transmission electron microscopy (HRTEM) was used to directly examine themicrostructure of the mesophase with crystalline walls for the first time.