Biomimetic synthesis of zeolitic imidazolate frameworks and their application in high performance acetone gas sensors
Biomimetic synthesis of zeolitic imidazolate frameworks and their application in high performance acetone gas sensors
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DOI：
10.1016/j.snb.2019.127187
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发表时间：
2020-01-01
影响因子：
8.4
通讯作者：
Xu, Jiaqiang
中科院分区：
文献类型：
--
作者：
Zhang, Dan;Fan, Yu;Xu, Jiaqiang
采用一种简便、环保的仿生方法合成了一系列分子筛咪唑骨架(ZIF)。用X射线衍射仪、场发射扫描电子显微镜、透射电子显微镜和傅立叶变换红外光谱对ZIF的织构进行了表征。结果表明，ZIF90为典型的菱形十二面体晶体，直径为800~1200 nm。此外，通过化学分析证实了富含醛基团的存在。研究了基于ZIF的石英晶体微天平(QCM)传感器的气敏实验。结果表明，ZIF-90传感器对低浓度丙酮蒸气具有较高的灵敏度(频移95 Hz@1ppm)、响应速度快(响应/恢复时间分别为12 S/17 S)和良好的选择性。在变温实验的基础上，测得ZIF-90分子筛与丙酮分子间存在着弱的可逆的化学吸附，并得到了一个中等的吸附热值(ΔH-theta为-57.93 kJ/mol)。用密度泛函理论计算得到的吸附热值(H=-60.10kJ/mol)与实验结果吻合较好。
A series of zeolitic imidazolate frameworks (ZIFs) were synthesized by a facile and environmental friendly biomimetic method. The textural properties of the ZIFs were characterized by PXRD, FESEM, TEM and FT-IR spectra. These results showed ZIF 90 having typical rhombic dodecahedron crystals with a diameter of 800-1200 nm. Furthermore, the presence of rich aldehyde groups is confirmed through chemical analysis. Gas-sensing tests of quartz crystal microbalance (QCM) transducers based on ZIFs were investigated. The results showed that ZIF-90 based sensors exhibited excellent sensing performance towards low concentration of acetone vapor, such as high sensitivity (the frequency shift was 95 Hz @ 1 ppm), fast response (the response/recovery time was 12 s/17 s, respectively) and good selectivity. On the basis of temperature-varying experimental method, a moderate adsorption enthalpy (the value of Delta H-theta was -57.93 kJ/mol) was obtained, indicating the existence of weak and reversible chemisorption between ZIF-90 and acetone molecules. The value of adsorption enthalpy (Delta H = - 60.10 kJ/mol) obtained from Density functional theory is in close agreement with the ex- perimental results.