Materials Chemistry and Nanochemistry Research Group, Center for Inorganic and Polymeric Nanomaterials, Chemistry Department, 80 St.George Street, University of Toronto, Toronto, M5S 3H6, Ontario, Canada.
ACS Nano. 2011 Apr 26;5(4):2861-9. doi: 10.1021/nn103464r. Epub 2011 Mar 18.
We report a facile sol-gel synthesis of colloidally stable Fe(2)O(3) and ZnO nanoparticles in alcoholic solvents, ROH, where R = methyl, ethyl, n-propyl, isopropyl, and tert-butyl. We show that nanoparticles of ZnO (4-42) nm and Fe(2)O(3) (4-38 nm) monotonically increase in size upon increasing the alkyl chain length and branching of the alcohol solvent. These colloidally stable and size-controllable metal oxide nanoparticles enable the formation of high optical quality films and photonic crystal multilayers whose component layer thickness, refractive index, porosity, and surface area are found to scale with the nature of the alcohol. Utility of these colloidally stable nanoparticles is demonstrated by preparation of one-dimensional porous photonic crystals comprising ncZnO/ncWO(3) and ncFe(2)O(3)/ncWO(3) multilayers whose photonic stop band can be tuned by tailoring nanoparticle size. Myriad applications can be envisaged for these nanoparticle films in, for example, heterogeneous catalysis, photocatalysis, electrocatalysis, chemical sensors, and solar cells.
我们报告了一种在醇溶剂 ROH（其中 R = 甲基、乙基、正丙基、异丙基和叔丁基）中胶体稳定的 Fe(2)O(3)和 ZnO 纳米粒子的简便溶胶-凝胶合成方法。我们表明，ZnO（4-42）nm 和 Fe(2)O(3（4-38）nm 的纳米粒子的尺寸在增大醇溶剂的烷基链长度和支化程度时呈单调增加。这些胶体稳定且尺寸可控的金属氧化物纳米粒子能够形成高质量的光学薄膜和光子晶体多层膜，其组成层厚度、折射率、孔隙率和表面积都与醇的性质有关。这些胶体稳定的纳米粒子的用途通过制备由 ncZnO/ncWO(3) 和 ncFe(2)O(3)/ncWO(3) 多层膜组成的一维多孔光子晶体来证明，其光子带隙可以通过调整纳米粒子尺寸来调节。这些纳米粒子薄膜在多相催化、光催化、电催化、化学传感器和太阳能电池等方面具有广泛的应用前景。
