ZnO-Based Hollow Microspheres: Biopolymer-Assisted Assemblies from ZnO Nanorods

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• 作者：Shuyan Gao ; Hongjie Zhang ; Xiaomei Wang ; Ruiping Deng ; Dehui Sun ; Guoli Zheng
• 刊名：Journal of Physical Chemistry B
• 出版年：2006
• 出版时间：August 17, 2006
• 年：2006
• 卷：110
• 期：32
• 页码：15847 - 15852
• 全文大小：869K
• 年卷期：v.110,no.32(August 17, 2006)
• ISSN：1520-5207

文摘

Many efforts have been made in fabricating three-dimensional (3D) ordered zinc oxide (ZnO) nanostructuresdue to their growing applications in separations, sensors, catalysis, bioscience, and photonics. Here, wedeveloped a new synthetic route to 3D ZnO-based hollow microspheres by a facile solution-based methodthrough a water-soluble biopolymer (sodium alginate) assisted assembly from ZnO nanorods. The productswere characterized by X-ray diffraction, field emission scanning electron microscopy, transmission electronmicroscopy, selected area electron diffraction, and X-ray photoelectron spectroscopy. Raman and photoluminescence spectra of the ZnO-based hollow microspheres were obtained at room temperature to investigatetheir optical properties. The hollow microspheres exhibit exciting emission features with a wide band coveringnearly all the visible region. The calculated CIE (Commission Internationale d'Eclairage) coordinates are0.24 and 0.31, which fall at the edge of the white region (the 1931 CIE diagram). A possible growth mechanismof the 3D ZnO superstructures based on typical biopolymer-crystal interactions in aqueous solution istentatively proposed, which might be really interesting because of the participation of the biopolymer. Theresults show that this biopolymer-directed crystal growth and mediated self-assembly of nanocrystals mayprovide promising routes to rational synthesis of various ordered inorganic and inorganic-organic hybridmaterials with complex form and structural specialization.