Dielectric and Ferroelectric Surface-Mounted Metal-Organic Frameworks (SURMOFs) as Sensor Devices

作为传感器器件的介电和铁电表面贴装金属有机框架 (SURMOF)

• 批准号: 316711251
• 负责人: Professor Dr. Michael Huth
• 金额: --
• 依托单位: Arbeitsgruppe Anorganische Chemie II: Chemie Anorganischer Materialien
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2016
• 资助国家: 德国
• 起止时间: 2015-12-31 至 2019-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/316711251?language=en
• 关键词: Dielectric; Ferroelectric; Surface; Mounted; Metal

Tunability, porosity and conformational flexibility are key properties of metal-organic frameworks (MOFs). An emerging application field of this material class is their use in highly miniaturized sensor structures. The main goal of this project is the development of a novel sensor concept up to a proof-of-concept stage. The adsorption of analyte guest molecules in surface-mounted MOFs (SURMOFs), causing changes in their dielectric properties, is detected via associated modulations of the conductivity of a nanogranular metal (NGM) sensing layer. This sensing layer is part of a SURMOF/NGM heterostructure. NGMs are artificial materials comprising metallic nano-particles which are embedded in a non-conducting matrix. Their conduction mechanism is based on thermally assisted tunneling and depends sensitively on the dielectric environment. Pillared SURMOF systems with rotatable dipolar linker molecules will be grown onto the NGM, with defined crystallographic orientation to mediate a stabilized ferroelectric order. In another approach, the SURMOFs serve themselves as a non-conducting matrix for two-dimensional ordered arrays of metallic nano-dots. This design will facilitate the occurrence of sizable variations in the frequency-dependent dielectric permittivity of the SURMOF upon interaction with polar (and non-polar) guest molecules. In order to achieve this ambitious goal, the competence of three groups focusing on the synthesis and characterization of SURMOFs, the fabrication and electrical characterization of NGMs and the theoretical atomistic simulation of MOFs have been combined.

可调性、孔隙率和构象柔性是金属有机骨架(MOF)的关键性能。这类材料的一个新兴应用领域是它们在高度小型化的传感器结构中的应用。该项目的主要目标是开发一种新的传感器概念，直到概念验证阶段。通过对纳米颗粒金属(NGM)传感层电导率的相关调制，可以检测到分析物客体分子在表面安装的MOF(SURMOF)中的吸附，从而导致其介电性质的变化。该传感层是SURMOF/NGM异质结的一部分。NGM是一种人造材料，由嵌入在非导电基质中的金属纳米颗粒组成。它们的导电机制是基于热辅助隧道效应，并且敏感地依赖于介电环境。带有可旋转偶极连接物分子的柱撑SURMOF系统将生长在NGM上，具有明确的晶体取向，以调节稳定的铁电秩序。在另一种方法中，SURMOF本身用作金属纳米点二维有序阵列的非导电矩阵。这种设计将有助于在与极性(和非极性)客体分子相互作用时，SURMOF的介电常数随频率发生显著变化。为了实现这一雄心勃勃的目标，三个小组的能力结合在一起，专注于SURMOF的合成和表征，NGM的制备和电学表征，以及MOF的理论原子模拟。