Vertically aligned carbon nanotubes grown from Langmuir-Blodgett films with nano alloy particles

In this study, we attempted to grow vertically aligned carbon nanotubes (VA-CNTs) from Langmuir-Blodgett (LB) films with accumulated nanoparticles and compare and evaluate the results with VA-CNTs grown from LB films with accumulated AlFe2O4 nanoparticles in the addition to CoFe2O4 and Fe3O4 nanoparticles. CVD was performed on the accumulated LB films under the following conditions. As a result, VA-CNTs grown from smaller AlFe2O4 nanoparticles were 4 to 5 times higher than from bigger AlFe2O4 nanoparticles. When VA-CNTs were grown by varying the catalyst area ratio with palmitic acid, VA-CNTs with AlFe2O4 nanoparticles were longer than those grown from Fe3O4 nanoparticles and CoFe2O4 nanoparticles when the catalyst area ratio was less than 0.2. The inner diameter of VA-CNTs grown with AlFe2O NPs gradually decreased with decreasing catalyst area ratio and approached the original particle diameter, similar to the case with Fe3O4 NPs. (C) 2022 The Japan Society of Applied Physics