Study of high radio frequency plasma discharge effects on carbon fiber using Raman spectroscopy

The goal of this research is to evaluate the potential of single and dual high RF reactors for the treatment of carbon fiber by Raman and FT-IR spectroscopies. Unsized poly-acrylonitrile (PAN) carbon fiber was treated with single high frequency (40.68 MHz) and double radio frequency capacitively coupled plasma (RF-CCP) discharge reactor (40.68/2.1 MHz) using pure nitrogen gas. The changes in the structure of the carbon fiber surfaces due to the variations of the D and G band intensity ratio (I-D/I-G), crystallite size (L-a) and Full-Width-at-Half-Maximum with plasma power, gas pressure, and treatment-time were described. It was found that the disorder of carbon fiber increases (the I-D/I-G ratio increased) with increasing high RF power and the process time. In contrast, the degree of the order (L-a) increases with increasing the gas pressure. It was also observed that the degree of graphitization accrued due to the shift of the D and G bands to the lower wave number. And, from FT-IR result, it was found that the C=C bond disappeared, and only carbon to nitrogen double and triple bonds are available by increasing pressure and RF power. In dual RF reactor, at high pressure and long process time, the disorder values (I-D/I-G) decrease with the increase of low frequency power. Furthermore, this mode has faster effects on the surface of carbon fiber than single RF mode.


Combined effects of ALS and SLS on Al2O3 reinforced composite nickel coatings
Yılmaz, Olgun; Karakaya, I. (Informa UK Limited, 2020-05-03)
The mechanical and tribological properties of electrochemical coatings can be enhanced by the embedded second phase particles to nickel matrix. Two different anionic surfactants sodium dodecyl sulfate and ammonium lignosulfonate were used together to adjust the wetting conditions and provide the suspension of Al2O3 particles in a nickel sulfamate electrolyte in this study. The effects of current density and amounts of the two surfactants on wear rate, coefficient of friction, and hardness were studied. It w...
Physical Characterization of Inclusion Complexes of Triphenyl Phosphate and Cyclodextrins in Solution.
Zhang, N; Zane, CP; Chen, Y; Yıldırım, Erol; Hinks, D; Tonelli, AE; Vinueza, NR; Pasquinelli, MA (American Chemical Society (ACS), 2020-01-16)
The goal of this work is to provide physical insights into the formation and stability of inclusion complexes (ICs) in aqueous solution between cyclodextrins (CDs) and a common flame retardant, triphenyl phosphate (TPP). Quantum chemistry calculations reveal the possible energetically favorable geometries of TPP in their 1:1 IC form with α-, β-, and γ-CDs as well as their associated complexation, conformational, and interaction energies. High-resolution mass spectrometry (MS) and tandem MS were used with el...
Construction of self-assembled vertical nanoflakes on CZTSSe thin films
Terlemezoğlu, Makbule; COLAKOGLU, T.; Abak, Musa Kurtuluş; Gullu, H. H.; Ercelebi, C.; Parlak, Mehmet (IOP Publishing, 2019-02-01)
Cu2ZnSn(S, Se)(4) (CZTSSe) is a promising alternative absorber material to achieve high power conversion efficiencies, besides its property of involving low-cost and earth-abundant elements when compared to Cu(In, Ga) Se-2 (CIGS) and cadmium telluride (CdTe), to be used in solar cell technology. In this study, a novel fabrication technique was developed by utilizing RF sputtering deposition of CZTSSe thin films having a surface decorated with self-assembled nanoflakes. The formation of nanoflakes was invest...
Preparation and Comparison of Two Electrodes for Supercapacitors: Pani/CNT/Ni and Pani/Alizarin-Treated Nickel
Koysuren, Ozcan; Du, Chunsheng; Pan, Ning; Bayram, Göknur (Wiley, 2009-07-15)
Polyaniline in emeraldine form was synthesized in the presence of multiwalled carbon nanotubes (CNTs), and the electrochemical capacitance performance of thus formed composite as electrode material has been Studied. The polyaniline/carbon nanotubes (Pani/CNT) composite is found to result in a higher specific capacitance than that of either composite constituent, attributable to the double-layer capacitance behavior of the nanotubes in the Pani/CNT system. However, once assembled into a two-electrode cell, l...
Flexible organic photovoltaics from zinc oxide nanowires grown on transparent and conducting single walled carbon nanotube thin films
Ünalan, Hüsnü Emrah; Kuo, Daniel; Parekh, Bhavin; Amaratunga, Gehan; Chhowalla, Manish (Royal Society of Chemistry (RSC), 2008-01-01)
The fabrication of flexible organic photovoltaics (OPVs) which utilize transparent and conducting single walled carbon nanotube (SWNT) thin films as current collecting electrodes on plastic substrates in zinc oxide nanowire (ZnO NW)/poly(3-hexylthiophene) (P3HT) bulk heterojunction photovoltaic devices is reported. The bulk heterojunctions for exciton dissociation are created by directly growing ZnO nanowires from solution on the SWNT electrodes and spin coating the P3HT polymer. A maximum OPV power convers...
Citation Formats
D. Akbar and Ü. Erözbek Güngör, “Study of high radio frequency plasma discharge effects on carbon fiber using Raman spectroscopy,” SURFACE & COATINGS TECHNOLOGY, pp. 233–242, 2014, Accessed: 00, 2020. [Online]. Available: