Synthesis of β-MoO3 Whiskers by a Thermal Evaporation Method with Oxygen Gas Flow
Synthesis of β-MoO3 Whiskers by a Thermal Evaporation Method with Oxygen Gas Flow
复制标题
氧气流热蒸发法合成 β-MoO3 晶须
DOI：
10.1111/jace.18192
复制
发表时间：
2022
期刊：
影响因子：
--
通讯作者：
and H. Suematsu
中科院分区：
文献类型：
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作者：
N. M. Chu;N. D. Hieu;T. M. D. Do;T. Nakayama;K. Niihara;and H. Suematsu
β‐MoO3是MoO3的单斜相；在化学、光学、电子和电致变色方面，它已被证明是一种有前途的材料，可以取代α‐moo3。然而，合成具有一维（1D）形态的β‐moo3的困难限制了其在需要大比表面积的应用中的应用。在本研究中，在管式炉中，在750 ~ 1000℃的温度（Tf）和流动的o2气体下，对α‐moo3粉末进行热蒸发，制备了β‐moo3晶须。经X射线衍射测定，样品主要为β‐moo3，在温度为1000°C时纯度最高。扫描电镜和透射电镜观察表明，该方法成功地合成了宽度为10 nm的晶须。晶格图像分析证实晶须为β‐moo3。通过对管式炉内温度分布的测量以及与Mo-O相图的比较，得出晶须通过气固路径形成的结论。利用X射线光电子能谱表征方法对制备的β‐moo3晶须与α‐moo3粉末进行了比较。通过阐明β‐moo3晶须的合成机理，本研究为β‐moo3晶须的大规模生产提供了指导。
β‐MoO3is a monoclinic phase of MoO3; it has been shown to be a promising material that can replace α‐MoO3in chemical, optical, electronic, and electrochromic applications. However, the difficulty in synthesizing β‐MoO3with a one‐dimensional (1D) morphology has limited its use in applications requiring a large specific surface area. In the present work, β‐MoO3whiskers were prepared by thermally evaporating α‐MoO3powder in a tube furnace at temperatures (Tf) from 750 to 1000°C and under flowing O2gas. The collected samples were identified as mainly β‐MoO3by X‐ray diffraction measurements, and the highest purity β‐MoO3was obtained atTf= 1000°C. Scanning and transmission electron microscopy observations showed that whiskers with a width of 10 nm were successfully synthesized by this method. The whiskers were confirmed to be β‐MoO3via lattice image analysis. Measurements of the temperature distribution in the tube furnace and comparisons with the Mo–O phase diagram led to the conclusion that the whiskers formed via a vapor–solid route. Prepared β‐MoO3whiskers were compared with α‐MoO3powder via the X‐ray photoelectron spectroscopy characterization method. By elucidating the β‐MoO3whisker synthesis mechanism, this research provides guidance for the large‐scale production of β‐MoO3whiskers.