Self-generation of tiered surfactant superstructures for one-pot synthesis of Co3O4 nanocubes and their closeand non-close-packed organizations

被引:257
作者
Xu, R
Zeng, HC
机构
[1] Inst Chem & Engn Sci, Singapore 119260, Singapore
[2] Natl Univ Singapore, Fac Engn, Dept Chem & Biomol Engn, Singapore 119260, Singapore
关键词
D O I
10.1021/la049164+
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Self-generation of ionic organic capping from nonionic surfactant polyoxyethylene (20) sorbitan trioleate (Tween-85) has been realized for the controlled synthesis of single crystalline Co3O4 quantum dots (3.0-5.7 nm) in cubic morphology from related layered hydroxide precursors at 80-95 degreesC. With chemical modification of hydrophobic functional groups on the surface Of Co3O4 nanocubes; furthermore, various nanocube-containing micellar superstructures can be further assembled through hydrophobic interactions between Tween-85 molecules and the surface coating under "one-pot" conditions. In particular, square arrangements, spherical domains, and line-assemblies of the prepared Co3O4 nanocubes and their inter-transformations have been attained for the first time by manipulating intersurfactant-interactions. Hydrolysis of Tween-85 and the resultant tiered surfactant superstructures have been investigated with FTIR/UV-vis/EA/TGA/DTA/XPS methods, and the capping species has been identified to be alkylated oleic carboxylate anions derived from Tween-85. Pronounced quantum confinement effects have been observed with the prepared Co3O4 nanocubes, and the optical band gap energies determined are 3.95 and 2.13 eV, respectively, for O2- --> Co2+ --> and O2- --> Co3+ charge-transfer processes.
引用
收藏
页码:9780 / 9790
页数:11
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