论文标题
使用HKUST-1的单晶体使用来宾可调介电感测
Guest-Tunable Dielectric Sensing Using a Single Crystal of HKUST-1
论文作者
论文摘要
基于多孔金属有机框架（MOF）的低k介电材料的兴趣上升，以改善微电子的电绝缘材料。在此，我们演示了由HKUST-1的单个晶体构建的MOF介电传感器的概念。我们通过监测暴露于不同蒸气（水，I2，甲醇，乙醇）的瞬时介电响应和AC电导率来研究极性和非极性分子的来宾封装效应。在100 Hz至2 MHz的频率范围内沿<100>晶体方向测量介电性能。介电数据显示了MOF介电传感器在区分来宾分析物方面的功效。时间依赖性的瞬态响应揭示了纳米级孔中分子包含和排除过程的动力学。由于介电响应与所有MOF材料无处不在（与DC电导率和荧光不同），因此与电阻传感器和基于发光的方法相比，我们的结果证明了电介质MOF传感器的潜力。
There is rising interest on low-k dielectric materials based on porous metal-organic frameworks (MOFs) for improved electrical insulation in microelectronics. Herein, we demonstrate the concept of MOF dielectric sensor built from a single crystal of HKUST-1. We study guest encapsulation effects of polar and non-polar molecules, by monitoring the transient dielectric response and AC conductivity of the crystal exposed to different vapors (water, I2, methanol, ethanol). The dielectric properties were measured along the <100> crystal direction in the frequency range of 100 Hz to 2 MHz. The dielectric data show the efficacy of MOF dielectric sensor for discriminating the guest analytes. The time-dependent transient response reveals dynamics of the molecular inclusion and exclusion processes in the nanoscale pores. Since dielectric response is ubiquitous to all MOF materials (unlike DC conductivity and fluorescence), our results demonstrate the potential of dielectric MOF sensors compared to resistive sensors and luminescence-based approaches.
