3.6 Transmission electron microscopy (TEM) analysis
Figure (9) TEM images show the synthesized magnetic metal-organic frameworks. The results of TEM analysis confirm the presence of some rod-like and hemispherical particles that are connected to each other. By observing the particles, it can be seen that the particles of the metal-organic framework are well crystallized and synthesized as columns (rods). These results are consistent with SEM observations. However, nickel ferrite particles located in the silica bed have a spherical morphology but their final shape changes when they are joined together by a metal-organic framework and the particles are irregularly shaped rods.
Transmission electron microscopy analysis is widely used to determine particle size, crystallographic data such as surface characteristics as well as particle size determination. This analysis is very useful and applicable for composite detection of nanoparticle-modified metalorganic frameworks because it determines nanoparticle dispersion and particle size. Fig (9) shown transmission electron microscopy analysis and revealed that the metal-organic framework composite was almost rod-shaped and nickel ferrite was deposited on the silica substrate and within the metal-organic framework network and the size of these nanocomposites by weight percentages of 10, 30 and 50 are 20, 32 and 40 nm respectively.
Fig (9) TEM image of synthesized NiFe2O4@SiO2@HKUST-1 metal-organic framework