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首页> 外文期刊>Nanotechnology >Fabrication of polycrystalline tubular ZnO via a modified ultrasonically assisted two-stEP 1polyol process and characterization of the nanotubes
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Fabrication of polycrystalline tubular ZnO via a modified ultrasonically assisted two-stEP 1polyol process and characterization of the nanotubes

机译：通过改进的超声辅助双-stEP 1多元醇工艺制备多晶管状ZnO及其纳米管的表征

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摘要

An ultrasonically assisted two-stEP 1polyol process was established to fabricate polycrystalline ZnO nanotubes. Thus one-dimensional ( 1D) precursors were prepared from an ethylene glycol ( EG) solution containing 0.3 M of zinc acetate in the presence of ultrasonic irradiation. The ZnO nanotubes were obtained by calcination of the precursors at proper temperatures. The precursors and polycrystalline ZnO nanotubes obtained at various calcination temperatures were characterized by means of scanning electron microscopy ( SEM), Fourier transformation infrared spectrometry ( FTIR), x-ray diffraction ( XRD, together with temperature-resolved XRD), and transmission electron microscopy ( TEM). It was found that the precursors were extremely sensitive to atmospheric moisture and instantly transformed to layered hydroxide zinc acetate ( LHS-Zn) after being exposed to air, accompanied by the erosion and deformation of the one-dimensional structure. After being calcined at proper temperatures, the precursors were completely transformed into polycrystalline tubular ZnO, and the sizes of the resulting ZnO nanocrystallites increased with increasing calcination temperature, implying that polycrystalline tubular ZnO of desired sizes could be fabricated using the present method by properly controlling the calcination temperature. However, the tubular structures were destroyed at a calcination temperature of 400 degrees C and above, owing to the growth of polycrystalline ZnO. Moreover, the present method could be used to synthesize other tubular metal oxides, and tubular ZnO might find promising applications in gas-sensitive sensors and catalysis as well.
机译：建立了超声辅助的2-stEP 1多元醇工艺来制造多晶ZnO纳米管。因此，在超声辐射的存在下，由含有0.3M乙酸锌的乙二醇（EG）溶液制备一维（1D）前体。 ZnO纳米管是通过在适当的温度下煅烧前体获得的。通过扫描电子显微镜（SEM），傅立叶变换红外光谱（FTIR），X射线衍射（XRD和温度分辨XRD）以及透射电子显微镜对在不同煅烧温度下获得的前体和多晶ZnO纳米管进行表征（TEM）。发现该前体对大气湿度极为敏感，并在暴露于空气后立即转变为层状氢氧化锌乙酸锌（LHS-Zn），并伴随着一维结构的腐蚀和变形。在适当的温度下煅烧后，将前体完全转化为多晶管状ZnO，并且所得到的ZnO纳米微晶的尺寸随煅烧温度的升高而增加，这表明可以通过本发明的方法适当控制氧化锌，制备出所需尺寸的多晶管状ZnO。煅烧温度。然而，由于多晶ZnO的生长，在400℃以上的煅烧温度下破坏了管状结构。而且，本发明的方法可用于合成其他管状金属氧化物，并且管状ZnO也可能在气敏传感器和催化中找到有前途的应用。

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