OICC Press International Nano Letters 2228-5326 8 1 (March 2018) 2018 04 02 The effect of initial pressure on growth of FeNPs in amorphous carbon films 10.1007/s40089-018-0228-4 EN Fatemeh Mashayekhi Department of Physics, Science and Research Branch, Islamic Azad University, Tehran, IR Azizollah Shafiekhani School of Physics, Institute for Research in Fundamental Sciences (IPM), Tehran, IR Department of Physics, Alzahra University, Tehran, 1993893973, IR S. Ali Sebt Department of Physics, Science and Research Branch, Islamic Azad University, Tehran, IR Elham Darabi Department of Physics, Science and Research Branch, Islamic Azad University, Tehran, IR Journal Article 2018 04 02 Abstract Iron nanoparticles in amorphous hydrogenated carbon films (FeNPs@a-C:H) were prepared with RF-sputtering and RFPECVD methods by acetylene gas and Fe target. In this paper, deposition and sputtering process were carried out under influence of different initial pressure gas. The morphology and roughness of surface of samples were studied by AFM technique and also TEM images show the exact size of FeNPs and encapsulated FeNPs@a-C:H. The localized surface plasmon resonance peak (LSPR) of FeNPs was studied using UV–vis absorption spectrum. The results show that the intensity and position of LSPR peak are increased by increasing initial pressure. Also, direct energy gap of samples obtained by Tauc law is decreased with respect to increasing initial pressure.