Nanocoating on Carbon Nanofibers by Plasma Polymerization of Ethylene Gas
- PDF / 431,826 Bytes
- 6 Pages / 612 x 792 pts (letter) Page_size
- 108 Downloads / 225 Views
1204-K05-33
Nanocoating on Carbon Nanofibers by Plasma Polymerization of Ethylene Gas Ernesto Hernández-Hernández1, María G. Neira-Velázquez1, Luis F. Ramos-de Valle1, Arturo Ponce1 and María G. Sánchez-Anguiano2 1
Centro de Investigación en Química Aplicada (CIQA). Blvd. Enrique Reyna #140, Saltillo, Coahuila 25253, México. 2 Facultad de Ciencias Químicas, Universidad Autónoma de Nuevo León. Av. Pedro de Alba S/N Cd. Universitaria, San Nicolás de los Garza, N.L. CP 66451, México.
ABSTRACT Ethylene gas was used to modify the surface of carbon nanofibers (CNFs) by plasma polymerization. The modified CNFs were characterized by Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, dispersion test in chloroform and high resolution transmission electron microscopy (HRTEM). The results of dispersion test in chloroform showed that the plasma treatment promoted a stable dispersion of the treated nanofibers in the solvent. The FTIR results indicated that an organic polymer was deposited on the surface of the CNFs, and the Raman spectra showed evidence of the chemical interaction between the nanofibers and the polyethylene (PE) deposited by plasma. The presence of the thin polymer coating on the surface of CNFs was confirmed by HRTEM.
INTRODUCTION The great versatility of plasma to carry out surface engineering has found a niche in the application of surface modification on nanostructures. Recently, different authors have been using plasma polymerization to modify the surface of different types of nanoparticles [1-3], such as carbon nanotubes (CNTs), carbon nanofibers, alumina, zirconium, iron oxide, beside others. If the gas used during the plasma treatment is oxygen, for example, the plasma treatment will tend to generate oxygen-containing groups on the nanoparticle surface. However, if the gas is a monomer, then the plasma treatment will tend to deposit an ultrathin coating of the corresponding polymer onto the nanoparticles surface. The resulting new properties of the nanoparticles after plasma treatment are opening up new application grounds. However, the interaction between the modified surface produced by plasma treatment with the atoms of substrate are yet to be elucidated. Raman spectroscopy is perhaps one of the best techniques to evaluate chemical interactions between a substrate and a coating. Different authors have been using Raman to measure the physical and chemical properties of carbon nanoparticles [4]. Using Raman, it is also possible to measure the average diameter of single-walled carbon nanotubes, quirality, electrical properties, coupling between electrons and phonons, presence of surface defects, charge transfer of electrons [5], etc.
Some authors have said that CNFs can be classified in the same way as CNTs [6] and that Raman spectra of CNF present similar signals as CNT. Those initial peaks that appear in the spectrum (within the interval of 150-350 cm-1) are called Radial Breathing Modes (RBMs), and are generated by the radial vibrations of carbon atoms. It is important to point o
Data Loading...
