|
چکیده
|
One-dimensional magnetic nanomaterials are scientifically interesting and of great importance due to their morphology-dependent properties. As a consequence of magnetic interactions between magnetic nanowires (MNWs) their bottom-up assembly remains a tough challenge. For the first time, using the Langmuir–Blodgett (LB) technique, we prepared two-dimensional (2D) large scale LB films of MNWs, which were synthesized by template directed electrodeposition method, on glass substrates. Using a plastic pipette, MNWs dispersed in chloroform were spread on the surface of the pure water subphase in a Teflon trough. After the stabilization of the monolayer, the Langmuir film was compressed and the surface pressure-area isotherm was recorded. By pulling up the substrate through the Langmuir film, mono- and bilayers of MNWs were deposited on the substrates at the target surface pressures of 10 mN/m and 15 mN/m. The surface pressure isotherm and field emission scanning electron microscope (FE-SEM) images showed that MNWs were successfully transformed onto the substrates. FESEM micrographs showed that the assembly of MNWs was different from that of metallic nanowires. Furthermore, the results showed that rotating the substrate by 90 degrees, after the deposition of the first layer, and then depositing the second layer on it does not lead to the creation of a hierarchical structure. These results open up new opportunities for the applications of magnetic nanomaterials in physical and chemical sensors, data-storage media and magnetic switching devices. Besides, this study affords fundamental insights into the formation of magnetic monolayers and multilayers
|