In Situ Growth of Metal–Organic Framework Thin Films with Gas Sensing and Molecule Storage Properties

Abstract

New porous metal-organic framework (MOF) films based on the flexible ligand 1,3,5-tris[4-(carboxyphenyl)oxamethyl]-2,4,6-trimethylbenzene (H3TBTC) were fabricated on α-Al2O3 substrates under solvent thermal conditions. The factors affecting the fabrication of films, such as the temperature of pre-activation and the dosage of the reagents, were investigated. Tuning the subtle factors on film fabrications, a series of MOF thin films with different morphologies and grain sizes were prepared. The morphology and grain size of the films are monitored by scanning electron microscopy (SEM). X-ray diffraction (XRD) and attenuated total reflection infrared (ATR-IR) were also used to characterize the MOF films. The results indicate that the temperature of pre-activation and the dosage of the reagents are the key parameters during the process of film formation. The properties of the films, especially the sensing and sorption behavior, have been studied by an optical digital cameral and ultraviolet-visible (UV-vis) spectra. The evidence shows that the films are sensitive to small organic molecules, such as methanol and pyridine. Meanwhile, the films can adsorb small dye molecules. Thus, the films may have potential applications in either organic vapor sensing or storage of small dye molecules.

Highly Dispersed HKUST-1 on Milimeter-Sized Mesoporous γ-Al2O3 Beads for Highly Effective Adsorptive Desulfurization

“…After the loading of HKUST-1 on the γ-Al 2 O 3 , the thermal stability of HKUST-1@γ-Al 2 O 3 greatly increased probably due to the formation of the hydrogen bonds. 57,58 The stacking density and crushing strength of HKUST-1@γ-Al 2 O 3 increased from 0.641 g/cm 3 , 62.2 N/grain to 0.769 g/ cm 3 , 96.1 N/gram, respectively. Besides, the HKUST-1@γ-Al 2 O 3 composite can be conveniently recycled by simple decantation method attributed to its millimeter size and enhanced mechanical strength.…”

Minimization of Surface Energies and Ripening Outcompete Template Effects in the Surface Growth of Metal–Organic Frameworks

“…[1][2][3][4][5][6][7][8] Several methods [9][10][11][12][13][14] for the formation of SURMOFs have been developed, which often permit adjusting film thickness, homogeneity,m orphology,c rystallographic orientation, lateral position, and/or surface roughness.O ft hese,am ethod called layer-by-layer (LbL) growth exhibits striking advantages in controlling the mentioned features,w hich can be crucial for MOF-based device applications. [1][2][3][4][5][6][7][8] Several methods [9][10][11][12][13][14] for the formation of SURMOFs have been developed, which often permit adjusting film thickness, homogeneity,m orphology,c rystallographic orientation, lateral position, and/or surface roughness.O ft hese,am ethod called layer-by-layer (LbL) growth exhibits striking advantages in controlling the mentioned features,w hich can be crucial for MOF-based device applications.…”

“…The immense potential of surface-attached metal-organic frameworks (SURMOFs) to serve as functional materials for numerous applications,i ncluding chemical sensors,optoelectronics,e lectronic devices,a nd membranes,h ave attracted significant interest throughout the scientific community. [1][2][3][4][5][6][7][8] Several methods [9][10][11][12][13][14] for the formation of SURMOFs have been developed, which often permit adjusting film thickness, homogeneity,m orphology,c rystallographic orientation, lateral position, and/or surface roughness.O ft hese,am ethod called layer-by-layer (LbL) growth exhibits striking advantages in controlling the mentioned features,w hich can be crucial for MOF-based device applications. [15][16][17][18][19] It is generally accepted that, independent of the deposition method, the key for the growth of homogeneous and highly oriented SUR-MOFs is the suitable adjustment of the surface chemistry,asit determines the interactions between the MOF structure and the surface.Avery convenient method to control the surface chemistry is the use of self-assembled monolayers (SAMs), which can be tailored to expose av ariety of functional groups.…”

Three-dimensional Printed Acrylonitrile Butadiene Styrene Framework Coated with Cu-BTC Metal-organic Frameworks for the Removal of Methylene Blue

“…MOFs have ordered structures, permanent porosity, high surface area and can contain many different functional groups which make them useful for a variety of applications such as gas separation and storage, catalysis, energy storage, sensors, pollutant removal and biomedicine12131415161718192021. For example, Cu-BTC (also known as MOF-199, HKUST-1, or Cu 3 BTC 2 ) reported for the first time by Chui et al 22.…”