Impact of crystal orientation on the adsorption kinetics of a porous coordination polymer-quartz crystal microbalance hybrid sensor
Impact of crystal orientation on the adsorption kinetics of a porous coordination polymer-quartz crystal microbalance hybrid sensor
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DOI：
10.1039/c3tc32101k
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发表时间：
2014-01-01
影响因子：
6.4
通讯作者：
Furukawa, Shuhei
中科院分区：
文献类型：
--
作者：
Hirai, Kenji;Sumida, Kenji;Furukawa, Shuhei
多孔配位聚合物（PCP）与电子器件的杂化是开发适用于高级应用（如化学传感）的系统的有力策略。石英晶体微天平技术是一种能够以高时间分辨率分辨微小质量变化的技术，在石英晶体微天平基底上生长具有选择性吸附特性的五氯苯酚晶体有助于快速检测气体或蒸汽混合物中的某些分子。在此，我们证明了柔性PCP Zn（NO2- ip）（bpy）（Zn-CID-5; NO2- ip（2-）= 5-硝基丙酸酯，bpy= 4，4 '联吡啶）在QCM基底上的固定化，并研究了所制造的系统的吸附性能。值得注意的是，晶体取向可以通过在衬底表面上锚定化学官能团或通过添加配位调节剂（例如，G. 4-苯基吡啶）。在这里，晶体取向在确定有机蒸气的检测动力学中起着重要作用（例如，G.甲醇），并且在混合组分（甲醇-己烷）条件下研究在测试样品中显示最快吸附动力学的[010]取向的情况，以证明其响应曲线。总之，结果表明PCP/QCM混合系统在传感器应用中的潜在效用，并且还用于突出优化晶体生长在这样的系统中的物理取向以最大化系统的整体性能的重要性。
The hybridization of porous coordination polymers (PCPs) with electronic devices is a powerful strategy for developing systems that are suitable for advanced applications, such as chemical sensing. The quartz crystal microbalance (QCM) technique is one that allows minute mass changes to be resolved with a high temporal resolution, and the growth of PCP crystals that provide selective adsorption properties on a QCM substrate can facilitate the rapid detection of certain molecules from a gas or vapour mixture. Herein, we demonstrate the immobilization of the flexible PCP Zn(NO2- ip)(bpy) (Zn-CID-5; NO2- ip(2-) = 5- nitroisophthalate, bpy= 4,4' bipyridine) on QCM substrates and investigate the adsorptive properties of the fabricated systems. Notably, the crystal orientation could be controlled by the anchoring of chemical functionalities on the substrate surface, or by the addition of coordination modulators (e. g. 4-phenylpyridine) at the time of growth of the PCP crystals on the substrates. Here, the crystal orientation plays a significant role in determining the detection kinetics of organic vapours (e. g. methanol), and the [010]-oriented case which displays the fastest adsorption kinetics among the samples tested is studied under mixed component (methanol-hexane) conditions to demonstrate its response profile. In all, the results demonstrate the potential utility of PCP/QCM hybrid systems in sensor applications, and also serve to highlight the importance of optimizing the physical orientation of crystal growth in such systems to maximize the overall performance of the system.