Fabrication of Organic/Inorganic Nanocomposites Using Pulsed Laser Ablation of Zinc in Aqueous Solutions
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EE13.18.1
Fabrication of Organic/Inorganic Nanocomposites Using Pulsed Laser Ablation of Zinc in Aqueous Solutions Takeshi Sasaki*, Changhao Liang, Hiroyuki Usui, Yoshiki Shimizu and Naoto Koshizaki Nanoarchitectonics Research Center, National Institute of Advanced Industrial Science and Technology (AIST), Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
ABSTRACT Hybrid organic/inorganic nanocomposites composed of zinc hydroxide and surfactant molecule, and/or zinc oxide nanoparticles were fabricated using pulsed laser ablation of zinc in aqueous solutions of various surfactants. A Zn plate was ablated by a pulsed Nd:YAG laser in four types of surfactant solutions with different concentrations. Zinc oxide nanoparticles with average diameter of 10-40 nm were obtained in cationic, amphoteric and nonionic surfactant solutions. Unique layered organic/inorganic nanocomposites composed of zinc hydroxide layers and surfactant molecules were obtained in aqueous solutions of the anionic surfactants, sodium alkyl sulfate (CnH2n+1SO4-·Na+). The carbon number, n, in the alkyl sulfate family is very important for the formation and structure of the layered nanocomposites. The layered organic/inorganic nanocomposite can be obtained only in the specific sodium alkyl sulfates (n=12, 13, 14 and 16) and the layer spacing of the nanocomposites increased with n from 26.8 Å to 42.0 Å. It is shown that the structures of ZnO nanoparticles and layered organic/inorganic nanocomposites can be controlled by the type of surfactants in solution. INTRODUCTION Pulsed laser ablation in gas phase has been widely used for the preparation of variety of nanostructures such as nanoparticles, nanotubes, and nanocomposites. Recently, noble metal nanoparticles of gold, silver and platinum [1,2], and various oxide base nanostructures [3,4,5] have been prepared by the pulsed laser ablation of the metallic target in water. This technique is promising for the controlled fabrication of nanostructures via rapid reactive quenching of ablated species with extremely high density and high kinetic energy at the interface between the plasma and liquid. Furthermore chemicals in solutions such as surfactants can also enhance the chemical reaction. The high temperature and pressure field can instantaneously be generated during the laser ablation in liquid [6,7]. These indicate the potential of this technique to form metastable structures. Especially in the case of the laser ablation of metallic target in aqueous solutions, the hydrothermal oxidation reaction can be utilized to prepare organic/inorganic nanocomposites. A layered organic/inorganic nanocomposite composed of high pressure phase of zinc hydroxide has been prepared by the laser ablation of zinc in aqueous solution of anionic surfactant, sodium dodecyl sulfate (SDS) [8]. In this study we investigate the effect of surfactants on the formation of organic/inorganic nanocomposite and nanoparticles by pulsed laser ablation of a zinc plate in the solutions.
EE13.18.2
EXPERIMENTAL Figure 1 shows the sch
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