Synthesis, characterization and magnetic properties of defective nitrogen-doped multiwall carbon nanotubes encapsulating ferromagnetic nanoparticles
García Betancourt, María Luisa
Vega Cantú, Yadira Itzel
Vega Díaz, Sofía Magdalena
Morelos Gómes, Aarón
Perea López, Néstor
Terrones Maldonado, Humberto
Terrones Maldonado, Mauricio
Muñoz Sandoval, Emilio
"Nitrogen-doped multi-walled carbon nanotubes (CNxMWNTs) with multiple morphological defects were produced using a modified chemical vapor deposition (CVD) method. In a typical CNxMWNTs synthesis by CVD, an acetone trap is used to catch organic by-products from pyrolysis. In the present work, an aqueous solution of NaCl (26.82 wt%) was used in the trap, instead of acetone. Carbon nanotubes with sharp tips and lumps were found in the products. Scanning electron microscopy (SEM) and high resolution transmission electron microscopy showed the formation of nanoparticles of different shapes inside the nanotubes. The electronic and magnetic properties were studied using a physical properties measurement Evercool system (PPMS). With this simple change in the CVD-trap, it is possible to control the morphology of carbon nanotubes and metallic nanoparticles. Differences in gas flow are proposed as a possible mechanism to produce these changes in both nanoparticles and CNxMWNTs."
Knowledge areaCIENCIAS TECNOLÓGICAS
EditorTrans Tech Publications Inc.
KeywordsCarbon Nanotube (CN)
Chemical Vapor Deposition (CVD)