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Missing-Linker 2D Conductive Metal Organic Frameworks for Rapid Gas Detection
- Source :
- ACS Sensors. 6:429-438
- Publication Year :
- 2021
- Publisher :
- American Chemical Society (ACS), 2021.
-
Abstract
- The structural diversity and tunability of metal organic frameworks (MOFs) represent an ideal material platform for a variety of practical scenarios ranging from gas storage/separation to catalysis, yet their application in chemiresistive gas sensing is relatively lacking, due to the requirements of combined electrical conductivity and optimized gas adsorption properties. Here, we report an effective chemical sensing strategy based on missing-linker two-dimensional conductive MOF, with incorporated defects via a simple ligand oxidization method. The multiple hydroxyl defect sites in the conductive 2D missing-linker amorphous Ni-HAB (aNi-HAB) enable rapid adsorption and desorption of water molecules compared to crystalline Ni-HAB (cNi-HAB). As a result, the aNi-HAB sensory device shows good sensitivity, selectivity, linearity, fast response/recovery rate, and excellent stability, which can be further improved by Nafion functionalization. Theoretical investigations including transient current measurement, density functional theory (DFT) calculations, and systematic performance evaluation of isostructural 2D aM-HAB (M = Cu, Fe, Co) MOF showed that unique transport mechanism and adsorption/activation energies originated from hydrogen bonding at defective sites are critical for enhanced humidity response, and further confirmed that defect engineering through missing linker incorporation is a general and effective approach to tune the sensing properties of conductive MOF materials.
- Subjects :
- Materials science
Bioengineering
02 engineering and technology
01 natural sciences
Catalysis
chemistry.chemical_compound
Adsorption
Nafion
Desorption
Molecule
Instrumentation
Metal-Organic Frameworks
Fluid Flow and Transfer Processes
Process Chemistry and Technology
010401 analytical chemistry
Electric Conductivity
Water
021001 nanoscience & nanotechnology
0104 chemical sciences
Amorphous solid
chemistry
Chemical engineering
Surface modification
Metal-organic framework
Density functional theory
0210 nano-technology
Subjects
Details
- ISSN :
- 23793694
- Volume :
- 6
- Database :
- OpenAIRE
- Journal :
- ACS Sensors
- Accession number :
- edsair.doi.dedup.....b06d4bcd3ef74da422854c17891b1d4d