Bramble-like Mesostructured Nickel Oxide Fiber Clusters
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Bramble-like Mesostructured Nickel Oxide Fiber Clusters
Jieming Cao*, Jun Wang, Jinsong Liu, Shuquan Chang, Baoqing Fang, Xianjia Ma, Xin Chang, Guoyue Xu, Jie Tao Nanomaterials Research Institute, College of Material Science & Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China ABSTRACT Bramble-like mesostructured nickel oxide/surfactant fibers were synthesized by using anionic surfactants (sodium dodecylsulfonate or sodium dodecylsulfate: SDS) as templates, and nickel salts as inorganic precursors, via the “S−I+” route in alkaline condition. The as-prepared samples were characterized by X-ray diffraction (XRD), Scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) spectroscopy and thermogravimetry-differential thermal analysis (TG/DTA) techniques. Such form of mesostructure nickel oxide is found for the first time and is believed to have potential applications in catalysis, host-guest chemistry, and electrochemical devices. INTRODUCTION Since 1992 researchers at Mobile Research and Development Corporation reported the synthesis of a group of mesoporous materials, designated M41S [1, 2], a variety of ordered mesoporous materials have been synthesized by using the supramolecular assembly of the surfactant molecules as templates. These materials may have promising applications in catalysis [3, 4], host-guest chemistry [5-7], and electrochemical devices such as batteries and fuel cells [8]. The discovery of producing the mesostructured metal oxides with different morphologies formed by the self-cooperative assembly of inorganic metal species and organic surfactants was considered a significant achievement for the past decade [9-15]. Nickel oxide, is a material widely used in fuel cell electrodes, catalysis, electrochemical devices, magnetic materials, etc [8]. Mesostructured nickel oxide might be shown to be an excellent electrode material for energy storage applications. Earlier investigations on the preparation of mesoporous nickel oxide resulted in lamellar phases [14-16]. Yang and co-workers [14] have synthesized oxide of Ni using block-copolymer/inorganic-salts methodology. Huo et al. [16] synthesized lamellar nickel oxide using C12H25PO4H2 as the surfactant. In this paper we synthesized hexagonally mesostructured nickel oxide /surfactant fibers using anionic surfactants as structure-directing agents and with a process of self-assembly based on “Cooperative Templating Mechanism” [15, 17] via the “S−I+” route [2].
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EXPERIMENTAL DETIALS All the chemical reagents used in the experiments were obtained from commercial sources as guaranteed-grade reagents and used without further purification. The synthesis method was based on the use of anionic surfactants (sodium dodecylsulfonate or sodium dodecylsulfate: SDS), as structure directing agents, and the simple chemical materials (NiCl2·6H2O, Ni(NO3)2·6H2O or NiSO4·6H2O), as inorganic precursors. A typical synthesis procedure was as follows: 1.442g of SDS surfactant was dissolved in 100ml water (0.05M)
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