Synthesis, Characterization, and Gas Sensing Properties of Porous Nickel Oxide Nanotubes
Synthesis, Characterization, and Gas Sensing Properties of Porous Nickel Oxide Nanotubes
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DOI：
10.1021/jp208093s
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发表时间：
2011-10
影响因子：
3.7
通讯作者：
Xuefeng Song;Lian Gao;S. Mathur
中科院分区：
文献类型：
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作者：
Xuefeng Song;Lian Gao;S. Mathur
基于Kirkendall效应和相变时体积变化的有效相互作用，采用一种新的方法来合成内部孔洞可控的多孔NiO纳米管。为此，镍纳米线被化学转化为Ni3S2/Ni核壳结构，然后进行受控氧化，由此产生的体积变化(Ni→NiO转化)导致了一维孔洞结构。通过调节氧化条件，可以控制Ni核和Ni3S2壳层之间的空隙，从而获得中空和双壁的形貌。用X射线衍射仪、扫描和透射电子显微镜、氮气吸附-脱附等方法对双壁NiO纳米管的物相组成、形貌演变和孔隙率进行了分析。在Ni3S2/Ni结构氧化过程中形成的气态硫氧化物形成了具有多个孔洞的穿孔结构，孔洞范围在1~14 nm之间。独一无二的复杂结构与我……
A novel approach was employed to synthesize porous NiO nanotubes with controllable interior voids based on an effective interplay of Kirkendall effect and volume change upon phase transformation. For this purpose, nickel nanowires were chemically converted into Ni3S2/Ni core–shell structures, followed by a controlled oxidation, whereby the associated volume change (Ni → NiO conversion) resulted in 1D porous structure with voids. The voids between the Ni core and Ni3S2 shell could be controlled by adjusting the oxidation conditions that enabled fabrication of hollow and double-walled morphologies. Phase composition, morphological evolution, and porosity of double-walled NiO nanotubes were analyzed by X-ray diffraction, scanning and transmission electron microscopy, and N2 adsorption–desorption studies. Gaseous sulfur oxides formed during the oxidation of Ni3S2/Ni structures resulted in a perforated structure with multiple voids with pores ranging between 1 and 14 nm. The unique complex structure with the i...