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ZnO-TiO2核殼納米線結(jié)構(gòu)及其熱穩(wěn)定性研究
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國家自然科學(xué)基金（51171145）


Structure and Thermal Stability of ZnO-TiO2 Core-Shell Nanowires
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    摘要:

    采用熱還原法和原子層沉積技術(shù)制備了ZnO-TiO2核殼納米線，研究沉積厚度、沉積溫度及退火對于ZnO-TiO2核殼納米線晶化和結(jié)構(gòu)的影響。利用X射線衍射（XRD）、掃描電子顯微鏡（SEM）、高分辨率透射電鏡（HRTEM）等手段對退火前后核殼納米線進(jìn)行表征。結(jié)果表明：沉積厚度和溫度的增加有利于TiO2殼層發(fā)生非晶向晶化的轉(zhuǎn)變；500 ℃退火提高了TiO2的結(jié)晶性，但可能會使細(xì)核殼納米線（ZnO納米線直徑<80 nm）產(chǎn)生波浪形變形，使150 ℃沉積的非晶TiO2殼層形成凸出晶粒，并導(dǎo)致其界面處ZnO缺失

    Abstract:

    ZnO-TiO2 core-shell nanowires were prepared by a thermal reduction method and an atomic layer deposition (ALD) technique. The effects of deposition thickness, deposition temperature and annealing on crystallization and structure of ZnO-TiO2 core-shell nanowires were studied. ZnO-TiO2 core-shell nanowires were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HRTEM). The results show that TiO2 shell is transformed from amorphous to crystallization with the increasing of the deposition thickness and deposition temperature. After 500 oC annealing, the crystallinity of TiO2 shell is improved, but wavy deformation is observed in the fine core-shell nanowires (the diameter of ZnO nanowires < 80 nm). As for amorphous TiO2 shell deposited at 150 oC after 500 oC annealing, convex grains are formed on the TiO2 shell and the loss of ZnO appears at the ZnO-TiO2 interface

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孫夢龍,王紅波,聶祥龍,馬大衍,馬 飛,徐可為. ZnO-TiO2核殼納米線結(jié)構(gòu)及其熱穩(wěn)定性研究[J].稀有金屬材料與工程,2015,44(12):3073~3077.[Sun Menglong, Wang Hongbo, Nie Xianglong, Ma Dayan, Ma Fei, Xu Kewei. Structure and Thermal Stability of ZnO-TiO2 Core-Shell Nanowires[J]. Rare Metal Materials and Engineering,2015,44(12):3073~3077.]
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  • 收稿日期:2015-04-05
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  • 在線發(fā)布日期: 2016-08-29
  • 出版日期: 2015-12-25