title: Growth and characterization of branched carbon nanostructures arrays in nano-patterned surfaces from porous silicon substrates.
abstract: A method to grow branched carbon nanostructures arrays is presented. We employ the electron-beam-induced deposition method using a transmission electron microscope in poor vacuum conditions where hydrocarbons are present in the chamber. The hydrocarbons are attracted to the substrates by the local electric fields. Saw-tooth nano-patterns were made with a focused ion beam in porous silicon substrates with high porosity in order to create sites with high-local electric fields. We found that the adequate ion dose to create well-defined saw-tooth nano-patterns was between 8 and 10 nC/microm(2). Raman and electron energy-loss spectroscopy on the branched carbon nanostructures show a high concentration of sp(2) sites suggesting that they are made of graphite-like hydrogenated amorphous carbon. Selected area electron diffraction, high-resolution images and energy dispersive X-ray analysis (EDS) are also presented.
authors.affiliation: Department of Physics and Institute for Functional Nanomaterials, University of Puerto Rico, Rio Piedras, PR 00931-3343, USA.
authors.forename: Francisco
authors.initials: F
authors.lastname: Solá
authors.forename: Oscar
authors.initials: O
authors.lastname: Resto
authors.forename: Azlin
authors.initials: A
authors.lastname: Biaggi-Labiosa
authors.forename: Luis F
authors.initials: LF
authors.lastname: Fonseca