Organic Molecule-Assisted Hydrothermal Self-Assembly of Size-Controlled Tubular ZnO Nanostructures
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- 作者：Liming Shen ; Ningzhong Bao ; Kazumichi Yanagisawa ; Kazunari Domen ; Craig A. Grimes ; Arunava Gupta
- 刊名：Journal of Physical Chemistry C
- 出版年：2007
- 出版时间：May 24, 2007
- 年：2007
- 卷：111
- 期：20
- 页码：7280 - 7287
- 全文大小：993K
- 年卷期：v.111,no.20(May 24, 2007)
- ISSN：1932-7455
文摘
Tubular ZnO nanostructures have been synthesized by hydrothermal self-assembly of zinc ions at the interfaceof organic molecules and solution. The morphologies and structures of the products were investigated byXRD, SEM, and TEM. Surfactants, cationic cetyltrimethylammonium bromide (CTAB), and the neutral triblockcopolymer of poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) (P123) were found to besuitable organic molecules for the assembly of layered zinc species-surfactant hybrids that can be exfoliatedinto single sheets. These sheet-like intermediates roll to form tubular ZnO nanostructures due to the heatstress and the crystallization of ZnO sheets. The size of tubular ZnO is determined by the type of surfactants,the concentration of surfactant, and the zinc species/surfactant molar ratio. Microtubes and nanotubes wereprepared by using the organic molecules of CTAB and P123, respectively. All tubular ZnO nanostructureswere found coexisting with the single sheet, layered sheets, and half-tube/half-sheet structures, indicating therolling of sheet-like intermediates to form the tubular ZnO nanostructures. In comparison to the productssynthesized in pure water, the interface assembly between organic molecules and inorganic species is theunderlying mechanism for the morphologic formation and structural evolution of tubular-like ZnOnanostructures. All diffraction peaks of the ZnO products are well indexed to the hexagonal phase (spacegroup P63mc) ZnO.