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Oxygen Plasma Treatment (oxygen + plasma_treatment)
Selected AbstractsSurface treatments of indium-tin oxide substrates for polymer electroluminescent devicesPHYSICA STATUS SOLIDI (A) APPLICATIONS AND MATERIALS SCIENCE, Issue 15 2006Z. Y. Zhong Abstract In this work, three different sets of processing techniques (wet, dry, and combined treatments) were utilized to modify the surfaces of indium-tin oxide (ITO) substrates for polymer electroluminescent devices (PELDs), and the influence of surface treatments on the surface properties of ITO substrates were investigated by X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), contact angle, and four-point probe. The surface energies of ITO substrates were also calculated from the measured contact angles. Experimental results show that the surface properties of the ITO substrates strongly depend on the surface treatments. Oxygen plasma treatment effectively improves the ITO surface properties since plasma decreases the surface roughness and sheet resistance, improves the surface stoichiometry and wetting. Furthermore, the PELDs with the differently treated ITO substrates as hole-injecting electrodes were fabricated and characterized. We observe that the optical and electrical characteristics of devices are greatly influenced by the surface treatments on ITO substrates. Oxygen plasma treatment decreases turn-on voltage, increases brightness and efficiency, and thereby improves the device performance of PELDs. (© 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source] Multilayer poly(vinyl alcohol)-adsorbed coating on poly(dimethylsiloxane) microfluidic chips for biopolymer separationELECTROPHORESIS, Issue 1 2005Dapeng Wu Abstract A poly(dimethylsiloxane) (PDMS) microfluidic chip surface was modified by multilayer-adsorbed and heat-immobilized poly(vinyl alcohol) (PVA) after oxygen plasma treatment. The reflection absorption infrared spectrum (RAIRS) showed that 88% hydrolyzed PVA adsorbed more strongly than 100% hydrolyzed one on the oxygen plasma-pretreated PDMS surface, and they all had little adsorption on original PDMS surface. Repeating the coating procedure three times was found to produce the most robust and effective coating. PVA coating converted the original PDMS surface from a hydrophobic one into a hydrophilic surface, and suppressed electroosmotic flow (EOF) in the range of pH 3,11. More than 1 000,000 plates/m and baseline resolution were obtained for separation of fluorescently labeled basic proteins (lysozyme, ribonuclease B). Fluorescently labeled acidic proteins (bovine serum albumin, ,-lactoglobulin) and fragments of dsDNA ,X174 RF/HaeIII were also separated satisfactorily in the three-layer 88% PVA-coated PDMS microchip. Good separation of basic proteins was obtained for about 70 consecutive runs. [source] Patterned Growth and Transfer of ZnO Micro and Nanocrystals with Size and Location Control,ADVANCED MATERIALS, Issue 8 2008Jesse J. Cole A method to fabricate and transfer crystalline ZnO with control over location, orientation, size, and shape is reported. The process uses an oxygen plasma treatment in combination with a photoresist pattern on magnesium-doped GaN substrates to define narrow nucleation regions and attachment points with 100 nanometer scale dimensions. Lateral epitaxial overgrowth follows nucleation to produce single-crystalline ZnO shown in the figure. [source] Superficial modification in recycled PET by plasma etching for food packagingJOURNAL OF APPLIED POLYMER SCIENCE, Issue 5 2010S. A. Cruz Abstract An oxygen plasma treatment has been used to improve the adhesion of amorphous hydrogenated carbon (a-C:H) films onto surfaces of recycled poly(ethylene terephthalate) (PET). Modifications produced by the oxygen plasma on the PET surface in chemical bonds and morphology were investigated by X-ray photoelectron spectroscopy and atomic force microscopy, respectively. Contact angle measurements were used to study the changes in the surface wettability. Adhesion of the a-C:H film onto the PET surface was investigated by the tape test method. It was observed that the improvement in film adhesion is in good correlation with the increase in surface roughness, due to plasma etching, and with the appearance of oxygen-related functional groups at the surface. The results of this study indicate that a-C:H-coated recycled PET can be used in food packaging. The a-C:H film could be used as a functional barrier to reduce or prevent migration of contaminants from the polymer to the package content. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2010 [source] Effect of oxygen plasma treatment on the tribological properties of Si-DLC coatingsPHYSICA STATUS SOLIDI (C) - CURRENT TOPICS IN SOLID STATE PHYSICS, Issue 4 2008J. Choi The cover picture of this issue of physica status solidi (c) has been taken from the article [1]. (© 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source] Wettablity of Poly(ethylene terephthalate) Substrates Modified by a Two-Step Plasma Process: Ultra Water Repellent Surface FabricationCHEMICAL VAPOR DEPOSITION, Issue 6 2004K. Teshima The fabrication of ultra-water-repellent poly(ethylene terephthalate) substrates has been achieved by a two-step plasma process. First, appropriate nanotextures are prepared on the substrate through an oxygen plasma treatment, and then a hydrophobic layer is coated on the nanotextured surfaces with plasma-enhanced CVD using tetramethylsilane. The resulting modified substrates show ultra-water-repellent characteristics with a water contact angle greater than 150° (Figure). [source] | |||||||||||||