Monitoring thermally induced structural deformation and framework decomposition of ZIF-8 through &ITin situ&IT temperature dependent measurements
Monitoring thermally induced structural deformation and framework decomposition of ZIF-8 through &ITin situ&IT temperature dependent measurements
复制标题
通过监测 ZIF-8 的热致结构变形和框架分解
DOI：
10.1039/c7cp04694d
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发表时间：
2017
影响因子：
3.3
通讯作者：
Sun Daofeng
中科院分区：
文献类型：
--
作者：
Xu Ben;Mei Yingjie;Xiao Zhenyu;Kang Zixi;Wang Rongming;Sun Daofeng
ZIF-8是一种易于合成的多孔材料，广泛应用于气体储存/分离、催化和纳米结构制造。热诱导的原子位移和由此产生的骨架变形/塌陷显著影响ZIF-8的应用，因此，原位温度依赖的FTIR光谱被用来研究在氧化环境中加热期间的骨架变化。结果表明，ZIF-8经历了三个过渡阶段，即200 °C以下的晶格膨胀阶段，200至350 °C的“可逆”结构变形阶段，以及350 °C以上的分解/塌陷阶段。我们的研究表明，在氧化剂环境中，Zn-N键在350 °C的温度下断裂，导致ZIF-8结构的剧烈变形。
ZIF-8 is an easily synthesized porous material which is widely applied in gas storage/separation, catalysis, and nanoarchitecture fabrication. Thermally induced atomic displacements and the resultant framework deformation/collapse significantly influence the application of ZIF-8, and therefore, in situ temperature dependent FTIR spectroscopy was utilized to study the framework changes during heating in the oxidative environment. The results suggest that ZIF-8 undergoes three transition stages, which are the lattice expansion stage below 200 °C, the “reversible” structural deformation stage from 200 to 350 °C, and the decomposition/collapse stage over 350 °C. Our research indicates that the Zn–N bond breaks at a temperature of 350 °C in the oxidant environment, leading to a drastic deformation of the ZIF-8 structure.