Graphene-like metal–organic frameworks: morphology control, optimization of thin film electrical conductivity and fast sensing applications

Abstract

Platelets of the Cu3hhtp2-MOF are used for coatings and sensing.

A silver nanoparticle-anchored UiO-66(Zr) metal–organic framework (MOF)-based capacitive H2S gas sensor

“…Fusion of organic linkers and inorganic metal ions by self-assembly has led to a new class of crystalline materials with high porosity called metal organic frameworks (MOFs) and has emerged as one of the research hotspot for designing new functional porous materials. 13 Thanks to their outstanding characteristics such as structural diversity, excellent tunability of pore size, high surface area, ultra-high porosity, flexibility, open metal sites, high thermal (200-500ºC) and chemical stability, [14][15][16] MOFs have encouraged researchers and scientists to explore in diverse applications such as catalysis, 17 separation and adsorption, 18,19 gas sensing, [20][21][22] bio-sensing, 23 and super-capacitors. 24 In particular, recent advances in MOFs are shown to be promising for developing low cost, ultra-fast, highly sensitive and selective gas sensors.…”

Electrically Conducting Nanocomposites of Carbon Nanotubes and Metal‐Organic Frameworks with Strong Interactions between the two Components

“…For checking this, we contacted coatings of UiO‐66‐CNT and UiO‐66‐(COOH) 2 ‐CNT composites and‐for comparison‐also pure CNT coatings with two electrodes (for a sketch of the set‐up see Figure S3, Supporting Information; for SEM images of the UiO‐66‐(COOH) 2 ‐CNT composite coatings, see Figure S12, Supporting Information). Using these assemblies, we performed preliminary sensing experiments . The units were placed in a glass tube and an electric potential was applied; an argon flow streaming through the tube could be supplied with different test molecules.…”

“…Using these assemblies, we performed preliminary sensing experiments. [18] The units were placed in a glass tube and an electric potential was applied; an argon flow streaming through the tube could be supplied with different test molecules. The resistance of the sample was measured continuously.…”

“…However, only very few MOFs exhibit intrinsic electrical conductivity, although different strategies have been developed to introduce this property to the coordination networks. These are based either on the usage of specific linkers, among them compounds containing tetrathiafulvalene or other sulfur‐containing moieties, or the so‐called graphene‐analogue MOFs based on triphenylene linker molecules . Fe(II)‐based framework structures often exhibit higher conductivities than their isostructural counterparts based on other metal ions .…”

“…These are based either on the usage of specific linkers, among them compounds containing tetrathiafulvalene [10,11] or other sulfur-containing moieties, [12][13][14] or the so-called graphene-analogue MOFs based on triphenylene linker molecules. [15][16][17][18] Fe(II)-based framework structures often exhibit higher conductivities than their isostructural counterparts based on other metal ions. [19][20][21][22] The insertion of guest molecules into MOFs with open metal sites can also create electrical conductivity [23][24][25] but the insertion naturally goes along with a partial loss of the porosity.…”