Flexible Cu3(HHTP)2 MOF Membranes for Gas Sensing Application at Room Temperature

Abstract

Mixed matrix membranes (MMMs), possessing high porosity, have received extensive attention for gas sensing applications. However, those with high flexibility and significant sensitivity are rare. In this work, we report on the fabrication of a novel membrane, using Cu3(HHTP)2 MOF (Cu-MOF) embedded in a polymer matrix. A solution comprising a homogenous suspension of poly-vinyl alcohol (PVA) and ionic liquid (IL), and Cu-MOF solid particles, was cast onto a petri dish to obtain a flexible membrane (215 μm in thickness). The sensor membrane (Cu-MOF/PVA/IL), characterized for its structure and morphology, was assessed for its performance in sensing against various test gases. A detection limit of 1 ppm at 23 °C (room temperature) for H2S was achieved, with a response time of 12 s. Moreover, (Cu-MOF/PVA/IL) sensor exhibited excellent repeatability, long-term stability, and selectivity towards H2S gas. The other characteristics of the (Cu-MOF/PVA/IL) sensor include high flexibility, low cost, low-power consumption, and easy fabrication technique, which nominate this sensor as a potential candidate for use in practical industrial applications.

Enhancing Hydrogen Sulfide Detection at Room Temperature Using ZIF-67-Chitosan Membrane

“…The sensor prototype was fabricated as detailed in our previous reports [ 10 , 11 ]. The sensor response toward H 2 S gas among other test gases was evaluated.…”

“…The sensing membranes (as 1 cm 2 square pieces) were fabricated into sensor prototypes by placing them between a copper sheet serving as a bottom electrode and a stainless steel mesh serving as a top electrode [ 10 , 11 ]. The configuration was fastened using Kapton tape.…”

“…One of these properties that have proven advantageous is material porosity. Materials such as metal–organic frameworks (MOFs) synthesized by linking metal cations or metal clusters with organic linkers possess this desirable porosity [ 10 , 11 ]. Another class of material that originates from the same family are zeolitic imidazole frameworks (ZIFs), which comprise inorganic metal cations (M 2+ ) and imidazolate-type ligands [ 12 , 13 ].…”

Organic/Inorganic-Based Flexible Membrane for a Room-Temperature Electronic Gas Sensor

“…The recorded profile matches well with the reported literature [41], confirming the incorporation of ZnO NPs into the polymer matrix. The FTIR analysis from Figure 3B shows that the membrane has the functional peaks associated with PVA [42,44] and ZnO NPs [42,45], along with a slight shift in their positions, inferring the incorporation of the NPs in the polymer matrix. The broad absorption bands at 3272 cm −1 and 2938 cm −1 denoting the O-H and C-H stretching modes, respectively, are observed.…”

Construction of hierarchical multilayered nanomaterials derived from Co-MOFs supported by pyromellitic acid for advanced lithium storage performance

“…6,7 Metal-organic frameworks (MOFs) made of metal ions (metal ion clusters) and bridging organic linkers have shown benefits in terms of their large surface area, high porosity, low density, controlled structure, and programmable pore size. [8][9][10][11][12] To date, MOFs have been extensively applied in catalysis, 13 gas storage, 14 proton conduction, 15 energy storage, 16 and so on, 17 but the assembly processes of MOFs are still undetermined due to numerous factors. [18][19][20][21] Typically, solvent molecules can behave as weakly coordinated ligands to impact the formation of MOFs, even though typically, solvent molecules are not near the crystal lattice and only affect crystal growth.…”