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首页> 外文期刊>RSC Advances >An abnormal phase transition behavior in VO2 nanoparticles induced by an M1-M2-R process: two anomalous high (> 68 degrees C) transition temperatures
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An abnormal phase transition behavior in VO2 nanoparticles induced by an M1-M2-R process: two anomalous high (> 68 degrees C) transition temperatures

机译：由M1-M2-R处理诱导的VO2纳米颗粒中的异常相转变行为：两种异常高（> 68℃）过渡温度

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摘要

Vanadium dioxide (VO2) has a reversible metal-insulator transition (MIT) at 68 degrees C and can be used to develop thermally and electrically sensitive devices. In this study, an abnormal phase transition behavior of VO2 nanoparticles was discovered during the comparison of pristine nanoparticles without and with high temperature thermal treatment. The single phase transition temperature at 65.1 degrees C for the pristine VO2 nanoparticles split into two temperatures at approximately 74 degrees C (T1) and 84 degrees C (T-2) after thermal treatment at 400 degrees C for 6 h. Both temperatures are much larger than 68 degrees C. Through characterization by Raman and transmission electron microscopy (TEM), the two higher transition temperatures could be well explained by the formation of VO2 (M2). Grain boundaries were observed during the merger and fusion processes of VO2 nanoparticles at high temperatures. The grain boundaries and interfacial defects resulted in the dislocation of the lattice structure and produced stress and strain in the VO2 nanoparticles. Consequently, VO2 (M2) with a higher temperature formed in the heating process and the initial MIT (M1-R) became an M1-M2-R transition. Moreover, the thermal treatment improves the phase transition enthalpy (Delta H) of VO2, which promotes the increase in the solar modulation ability (Delta T-sol) of VO2-PET composite film from 12.8% to 15.2-17.0% without loss in the luminous transmittance. These findings are of great significance to the deep understanding of MIT and the development of VO2 smart windows.
机译：二氧化钒（VO2）在68℃下具有可逆金属 - 绝缘体过渡（MIT），可用于开发热敏和电敏感装置。在该研究中，在丙氨酸纳米颗粒的比较期间发现了VO2纳米颗粒的异常相转变行为，没有高温热处理。对于在400℃的热处理后，在65.1℃下，对于原始VO2纳米颗粒在约74℃（T1）和84℃（T-2）的温度下，单相转变温度在400℃下进行6小时。通过拉曼和透射电子显微镜（TEM）的表征，两个温度大于68℃，通过形成VO2（M2），可以很好地解释两个更高的过渡温度。在高温下的vo2纳米颗粒的合并和融合过程中观察到晶界。晶界和界面缺陷导致晶格结构的位错，并在VO2纳米粒子中产生应力和菌株。因此，在加热过程中形成具有较高温度的VO2（M2）和初始MIT（M1-R）变为M1-M2-R转变。此外，热处理改善了VO2的相转变焓（Delta H），其促进了VO2-PET复合膜的太阳调节能力（Delta T-Sol）的增加，从12.8％到15.2-17.0％而不会损失发光透射率。这些发现对于对MIT的深刻理解和VO2智能窗口的发展具有重要意义。

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  • 来源
    《RSC Advances》 |2016年第56期|共8页
  • 作者

    Dong Bingrong; Shen Nan; Cao Chuanxiang; Chen Zhang; Luo Hongjie; Gao Yanfeng;

  • 作者单位

    Chinese Acad Sci Shanghai Inst Ceram State Key Lab High Performance Ceram &

    Superfine 1295 Dingxi Shanghai 200050 Peoples R China;

    Chinese Acad Sci Shanghai Inst Ceram State Key Lab High Performance Ceram &

    Superfine 1295 Dingxi Shanghai 200050 Peoples R China;

    Chinese Acad Sci Shanghai Inst Ceram State Key Lab High Performance Ceram &

    Superfine 1295 Dingxi Shanghai 200050 Peoples R China;

    Shanghai Univ Sch Mat Sci &

    Engn 99 Shangda Shanghai 200444 Peoples R China;

    Chinese Acad Sci Shanghai Inst Ceram State Key Lab High Performance Ceram &

    Superfine 1295 Dingxi Shanghai 200050 Peoples R China;

    Shanghai Univ Sch Mat Sci &

    Engn 99 Shangda Shanghai 200444 Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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