• Title/Summary/Keyword: Plasma treatment

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Increase in Color Depth and Analysis of the Interfacial Electrokinetic Potential of Poly(Ethylene Terephthalate) Fabric by Plasma Treatment (폴리에스테르 직물의 저온플라즈마 처리에 따른 계면동전위와 심색성 향상에 관한 연구)

  • Jeon, Sang-Min;Lee, Ki-Poong;Gu, Kang
    • Textile Coloration and Finishing
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    • v.15 no.4
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    • pp.1-7
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    • 2003
  • We investigated the effect of color depth on polyester fabrics by plasma treatment. In this study, although it have many paper about effects of plasma treatment, we observed interfacial electrokinetic potential of polyester fabrics by plasma treatment and also we investigated relationship between deep coloring agent and plasma treatment to get the effect of color depth on polyester fabrics. The results obtained are as follows, 1. Plasma treatment did not enhanced the effect of color depth of polyester fabrics by plasma treatment independently. 2. In the case of using the deep coloring agent with plasma treatment on polyester fabrics, lightness was more decreased than using the deep coloring agent itself. 3. Plasma treatment could not affect surface shape and tensile strength of treated polyester fabrics.

Effect of Plasma Pretreatment on Alkaline Hydrolysis of Poly(ethylene terephthalate) Fabrics (플라즈마 전처리가 폴리에스테르 직물의 알칼리 가수분해에 미치는 효과)

  • Sin, Jun-Seop;Kim, Ji-Hyeon
    • Textile Science and Engineering
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    • v.34 no.9
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    • pp.604-613
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    • 1997
  • PET fabrics were hydrolyzed with NaOH solution after plasma treatment. The surface physicochemical changes and weight loss, according to the various conditions of plasma treatment (gas, power, pressure, and time), were investigated. From surface tension and ESCA analysis, it appeared that reactive gas $(O_2,\;air)$ plasma treatment introduced more polar groups on the PET surface than non-reactive gas (argon) plasma treatment. Also, the polar group contents was decreased by heat treatment. The etching effect of 0$_2$and air in plasma treatment was greater than that of argon. Weight loss rate in alkaline hydrolysis after argon plasma treatment was much higher than that of $O_2$and air plasma treatment. Heat treatment after 0$_2$and air plasma treatment increased the weight loss rate in alkaline hydrolysis.

Hydrophilic Modification of Polypropylene Hollow Fiber Membrane by Dip Coating, UV Irradiation and Plasma Treatment

  • Kim Hyun-Il;Kim Jin Ho;Kim Sung Soo
    • Korean Membrane Journal
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    • v.7 no.1
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    • pp.19-27
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    • 2005
  • PP hollow fiber membrane was hydrophilized by EVOH dip coating followed by low temperature plasma treatment and UV irradiation. EVOH coating attained high water flux without any prewetting but its stability did not guaranteed at high water permeation rate. At high water permeation rate, water flux declined gradually due to swelling and delamination of the EVOH coating layer causing pore blocking effect. However, plasma treatment reduces the swelling, which suppress delamination of the EVOH coating layer from PP support result in relieving the flux decline. Also, UV irradiation helped the crosslinking of the EVOH coating layer to enhance the performance at low water permeation rate. FT-IR and ESCA analyses reveal that EVOH dip coating performed homogeneously through not only membrane surface but also matrix. Thermogram of EVOH film modified plasma treatment and W irradiation show that crosslinking density of EVOH layer increased. Chemical modification by plasma treatment and UV irradiation stabilized the hydrophilic coating layer to increase the critical flux of the submerged membrane.

Enhancement of Field Emission Characteristics of CuO Nanowires Formed by Wet Chemical Process (습식공정으로 형성된 구리산화물 나노와이어의 전계방출특성 향상)

  • Sung Woo-Yong;Kim Wal-Jun;Lee Seung-Min;Lee Ho-Young;Park Kyung-Ho;Lee Soonil;Kim Yong-Hyup
    • Journal of the Korean institute of surface engineering
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    • v.37 no.6
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    • pp.313-318
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    • 2004
  • Vertically-aligned and uniformly-distributed CuO nanowires were formed on copper-coated Si substrates by wet chemical process, immersing them in a hot alkaline solution. The effects of hydrogen plasma treatment on the field emission characteristics of CuO nanowires were investigated. It was found that hydrogen plasma treatment enhanced the field emission properties of CuO nanowires by showing a decrease in turn-on voltage, and an increase in emission current density, and stability of current-voltage curves. However, the excessive hydrogen plasma treatment made the I-V curves unstable. It was confirmed by XPS (X-ray Photoelectron Spectroscopy) analysis that hydrogen plasma treatment deoxidized CuO nanowires, thereby the work function of the nanowires decreased from 4.35 eV (CuO) to 4.1 eV (Cu). It is thought that the decrease in the work function enhanced the field emission characteristics. It is well-known that the lower the work function, the better the field emission characteristics. The results suggest that the hydrogen plasma treatment is very effective in achieving enhanced field emission properties of the CuO nanowires, and there may exist an optimal hydrogen plasma treatment condition.

Study on Properties Change of a-C Thin Film by N2 Plasma Treatment (질소 플라즈마처리에 의한 a-C 박막의 전계방출특성 변화에 관한 연구)

  • Ryu, Jeong-Tak;Lee, K.Y.;Honda, S.;Katayama M.;Oura, K.
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.17 no.12
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    • pp.1332-1336
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    • 2004
  • Amorphous carbon (a-C) films have been deposited on Si(100) substrate using RF magnetron system in order to investigate the electron field emission properties. The a-C films were treated by $N_2$ gas plasma at room temperature. Surface morphologices and structural properties of the a-C films before and after $N_2$ plasma treatment were observed by scanning electron microscopy and Raman spectroscope, respectively. Structural properties and surface morphology of the a-C films were changed by $N_2$ plasma treatment. The emission properties can be improved by the plasma treatment according to the contents of nitrogen on the a-C films which is varied by plasma treatment time. Before the plasma treatment, the a-C films are found to have a threshold field of 14 V/$\mu$m, but the a-C film treated by $N_2$ plasma for 30 min exhibit threshold field as low as 6.5 V/$\mu$m.

N$_2$ Plasma Treatment Effects of Silicon Nitride Insulator Layer for Thin Film Transistor Applications

  • Ko, Jae-Kyung;Park, Yong-Seob;Park, Joong-Hyun;Kim, Do-Young;Yi, Jun-Sin;Chakrabarty, K.
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.563-566
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    • 2002
  • We investigated to decrease the leakage current of SiNx film by employing $N_2$ plasma treatment. The insulator layers were prepared by two step process; the $N_2$ plasma treatment and then PECVD SiNx deposition with $SiH_4$, $N_2$ gases. To prove the influence of the $N_2$ plasma treatment, the Si substrate was exposed to the plasma, which was generated in Ne gas ambient. Without plasma treatment SiNx film grow at the rate of 7. 03 nm/min, has a refractive index n = 1.77 and hydrogen content of $2.16{\times}10^{22}cm^{-3}$ for $N_2/SiH_4$ gas flow ratio of 20. The obtained films were analyzed in terms of deposition rates, refractive index, hydrogen concentration, and electrical properties. By employing $N_2$ plasma treatment, interface traps such as mobile charges and injected charges were removed, hysteresis of capacitance-voltage (C-V) disappeared. We observed plasma treated sample were decreased the leakage current density reduces by 2 orders with respect to the sample having no plasma treatment.

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Effect of Plasma Treatment on the Physical Properties of Spunbound Nonvovens (스펀본드의 부직포의 물성에 있어 플라즈마 가공조건의 영향)

  • 최형호;이승구;주창환
    • Textile Science and Engineering
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    • v.38 no.7
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    • pp.342-350
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    • 2001
  • In order to investigate the hydrophilicity and dyeability of polypropylene spunboun(PP/SB) nonwovens, PP/SB nonwovens were treated by the plasma system in oxygen atmosphere at different treatment times and discharge powers. Dimensional change and physical properties of PP/SB nonwovens according to the plasma treatment conditions were evaluated. Surface structure and morphology of PP/SB nonwovens were characterized by SEM. Contact angles onto PP/SB nonwovens for water and methyleneiodide were measured and surface energies were calculated by Owen and Wendt's methods. Microcraters were observed on the surface of plasma treated PP/SB nonwovens. Tenacity and breaking strain of PP/SB nonwovens decreased with increasing treatment time and discharge power. Surface energy of PP/SB nonwovens increased by the plasma treatment. Meanwhile, the friction static voltage decreased by the plasma treatment due to the improvement of surface hydrophilicity. Dyeability of PP/SB nonwovens was enhanced to some extent by the oxygen plasma treatment.

A Study of Atmospheric Plasma Treatment on Surface Energetics of Carbon Fibers

  • Park, Soo-Jin;Chang, Yong-Hwan;Moon, Cheol-Whan;Suh, Dong-Hack;Im, Seung-Soon;Kim, Yeong-Cheol
    • Bulletin of the Korean Chemical Society
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    • v.31 no.2
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    • pp.335-338
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    • 2010
  • In this study, the atmospheric plasma treatment with $He/O_2$ was conducted to modify the surface chemistry of carbon fibers. The effects of plasma treatment parameters on the surface energetics of carbon fibers were experimentally investigated with respect to gas flow ratio, power intensity, and treatment time. Surface characteristics of the carbon fibers were determined by X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM), Fourier transform infrared (FT-IR), Zeta-potential, and contact angle measurements. The results indicated that oxygen plasma treatment led to a large amount of reactive functional groups onto the fiber surface, and these groups can form together as physical intermolecular bonding to improve the surface wettability with a hydrophilic polymer matrix.

Modifications of ITO Surfaces in Organic EL Devices by $O_2$ Plasma Treatment (O$_2$ 플라즈마 처리에 의한 ITO 표면개질 변화에 따른 유기 EL 소자 특성)

  • 박상무;김형권;이덕출
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.52 no.6
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    • pp.261-266
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    • 2003
  • We investigated the effect of oxygen plasma treatment of indium-tin oxide(ITO) surface on the performance of electroluminescence(EL) devices. ITO surface treated oxygen plasma has been analyzed using atomic force microscope(AFM) and X-ray photoelectron spectroscopy(XPS), to investigate the relations between the properties of the ITO surface and the properties of the current-voltage-luminance(I-V-L) characteristics of the fabricated OLED with the structure of ITO(plasma treatment) / TPD / Alq$_3$/ Al. It is found that the oxygen plasma treatment of ITO anode improve the hole injection of the OLED due to the modification of the surface states. The treated ITO anode nay be low voltage with high luminance efficiency.

The effects of plasma treatment of polyimide surface on the adhesion of chromium/polyimide (크롬/폴리이미드의 접착력에 미치는 폴리이미드 표면의 플라즈마 처리의 효과)

  • Chung, Tae-Gyeong;Kim, Young-Ho;Yu, Jin
    • Journal of the Korean institute of surface engineering
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    • v.26 no.2
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    • pp.71-81
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    • 1993
  • Thed effects of Ar or Oxygen RF plasma treatment on the adhesion behavior of Cr films to polyimide sub-strates have been investigated by using SEM, XRD, AES, and $90^{\circ}$peel test. By applying RF plasma treatment of the polyimide surface prior to metal deposition, the peel adhesion strength of Cu/Cr films sputtered onto the fully cured BPDA-PDA polyimide was highly increased from about 3g/mm to 90 ~ 100g/mm. Improved peel adhesion strength of Cr/polyimide interfaces due to RF plasma treatment was attributed to the contributions from surface cleaning, Cr-polyimide bonding at the interface, and force required for plastic deformation of the film. While the surface topology change of the polyimide caused by RF plasma treatment makes a little contri-bution to the improved adhesion.

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