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.

可调谐性、多孔性和构象柔性是金属有机框架（MOFs）的关键性质。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，直至概念验证阶段。在表面安装的MOFs（SURMOFs）的分析物客体分子的吸附，导致其介电性质的变化，检测通过相关的调制的纳米颗粒金属（NGM）的传感层的导电性。该传感层是SURMOF/NGM异质结构的一部分。NGM是包含嵌入非导电基质中的金属纳米颗粒的人造材料。它们的导电机制是基于热辅助隧穿，并敏感地依赖于介电环境。具有可旋转偶极连接分子的柱撑SURMOF系统将生长到NGM上，具有限定的晶体取向以介导稳定的铁电秩序。在另一种方法中，SURMOF本身用作金属纳米点的二维有序阵列的非导电基质。这种设计将促进SURMOF的频率依赖性介电常数在与极性（和非极性）客体分子相互作用时发生相当大的变化。为了实现这一雄心勃勃的目标，三个小组的能力集中在SURMOFs的合成和表征，NGM的制造和电特性和MOFs的理论原子模拟相结合。