Oxygen Plasma Treatment of Fluorinated Polyimide: An X-Ray Photoelectron Spectroscopy Study

1992 ◽  
pp. 215-223 ◽  
Author(s):  
Naresh C. Saha ◽  
Li-Hsin Chang
Keyword(s):  
Plasma Treatment ◽  
Photoelectron Spectroscopy ◽  
Oxygen Plasma ◽  
Oxygen Plasma Treatment ◽  
Spectroscopy Study ◽  
X Ray ◽  
Fluorinated Polyimide

Effect of oxygen plasma treatment on the performance of recessed AlGaN/GaN Schottky barrier diodes

2021 ◽  
Author(s):  
Wei Mao ◽  
shihao Xu ◽  
Haiyong Wang ◽  
Cui Yang ◽  
ShengLei Zhao ◽  
...  
Keyword(s):  
Plasma Treatment ◽  
Schottky Barrier ◽  
Photoelectron Spectroscopy ◽  
Oxygen Plasma ◽  
Oxygen Plasma Treatment ◽  
Surface Oxide Layer ◽  
Schottky Barrier Diodes ◽  
X Ray ◽  
Current Collapse ◽  
Effect Of Oxygen

Abstract The treatment effect of the oxygen plasma on the performance of recessed AlGaN/GaN Schottky barrier diodes has been investigated. After the oxygen plasma treatment, the turn-on voltage and reverse leakage current are slightly changed, while the current collapse could be effectively mitigated. The X-ray photoelectron spectroscopy results suggest that a thin surface oxide layer is formed by the oxygen plasma treatment, which is responsible for the reduced current collapse. In addition, the device with oxygen plasma treatment has a relatively more inhomogeneous barrier height.

scholarly journals The Amorphization of Monolayer MoS2 Induced by Strong Oxygen Plasma Treatment

2019 ◽  
Vol 26 (2) ◽  
pp. 143-146
Author(s):  
Jian-Ling MENG ◽  
Jian-Qi ZHU ◽  
Shun-Tian JIA ◽  
Xiao REN
Keyword(s):  
Visible Light ◽  
Plasma Treatment ◽  
Raman Spectra ◽  
Photoelectron Spectroscopy ◽  
Oxygen Plasma ◽  
Oxygen Plasma Treatment ◽  
Visible Light Photocatalysis ◽  
Monolayer Mos2 ◽  
X Ray ◽  
Raman Modes

By strong oxygen plasma treatment on monolayer MoS2, we observe the disappearance of the Raman modes of MoS2. We propose the hypothesis that the state of MoS2 translates from crystal to amorphous after strong oxygen plasma treatment. The evidences of no MoO3 formation shown by Raman spectra and the appearance of the Mo6+ peak and decreased O concentration shown by X-ray photoelectron spectroscopy support our hypothesis. The amorphization of monolayer MoS2 is further confirmed by the quenching of photoluminescence (PL) and the disappearance of two absorption peaks related to A, B exciton which demonstrates the disordered bandgap. Finally, we found that the amorphous MoS2 can improve the absorption fraction at the visible light (500~ 750 nm) which is potential for future visible light photocatalysis.

Oxygen plasma treatment of bamboo fibers (BF) and its effects on the static and dynamic mechanical properties of BF-unsaturated polyester composites

Holzforschung ◽  
2015 ◽  
Vol 69 (4) ◽  
pp. 449-455 ◽  
Author(s):  
Wendi Liu ◽  
Tingting Chen ◽  
Tianshun Xie ◽  
Fuwen Lai ◽  
Renhui Qiu
Keyword(s):  
Plasma Treatment ◽  
Photoelectron Spectroscopy ◽  
Interfacial Adhesion ◽  
Oxygen Plasma ◽  
Unsaturated Polyester ◽  
Flexural Modulus ◽  
Oxygen Plasma Treatment ◽  
X Ray ◽  
Dynamic Mechanical ◽  
Bamboo Fibers

Abstract A novel method for the preparation of bamboo fibers (BF) has been investigated that includes crushing, rolling, and other combing techniques with 1,4-butanediol as a dispersant. The fibers were treated by oxygen plasma to improve their interfacial adhesion to unsaturated polyester (UPE) resins. Composites were prepared from the plasma treated fibers (BFtr) and UPE by hand lay-up compression molding. BFtr significantly increased the tensile strength, flexural strength, and flexural modulus of the resulting BF-UPE composites. Dynamic mechanical analysis indicated that the plasma treatment essentially increased the storage modulus and glass transition temperature of the composites. The damping parameter of the composites showed a decreasing trend in the glassy region, while the opposite was true for the rubbery region. X-ray diffraction analysis indicated that the treatment did not change the crystal structures within the fibers but increased slightly their crystallinity indices. X-ray photoelectron spectroscopy analysis revealed that the surface of BFtr had a higher oxygen concentration and oxygen/carbon ratio than that of BF. The scanning electron microscopy graphs of the tensile-fractured surface of the composites demonstrated an improved interfacial adhesion between BFtr and UPE resins.

Improvement in the Activation Efficiency of Implanted Si in GaAs using Oxygen Plasma Pretreatment

1992 ◽  
Vol 259 ◽  
Author(s):  
Jaeshin Cho ◽  
Leszek M. Pawlowicz ◽  
Naresh C. Saha
Keyword(s):  
Photoelectron Spectroscopy ◽  
Oxygen Plasma ◽  
Chemical Vapor ◽  
Gaas Surface ◽  
Oxygen Plasma Treatment ◽  
Surface Conditions ◽  
X Ray ◽  
Plasma Pretreatment ◽  
Activation Efficiency ◽  
Thick Oxide Layer

ABSTRACTWe have investigated the effect of GaAs surface conditions prior to plasma enhanced chemical vapor deposition of a silicon nitride cap on the activation efficiency of implanted Si in GaAs. The oxygen plasma treatment improved the activation efficiency of implanted Si by ∼35% over (1:10) NH4OH:H2O treatment. X-ray photoelectron spectroscopy (XPS) analysis of the oxygen plasma treated GaAs surface indicated the formation of ∼25Å thick oxide layer consisting of Ga2O3, As2O3, As2O5 and elemental As. During the activation anneal, the arsenic-containing oxides react with the GaAs substrate to form Ga2O3 and elemental As. The presence of excess As between the GaAs and the nitride cap film increases the probability that the implanted Si incorporates in the Ga sites over the As sites, and thereby improves the activation efficiency. This surface-related mechanism suggests that the variation in activation efficiency is mostly attributed to variation in surface conditions, and may explain the wide variety of reported values of activation efficiency.

Spectroscopic Analyses of Sputtered Aluminum Oxide Films with Oxygen Plasma Treatments

2019 ◽  
Vol 947 ◽  
pp. 96-100
Author(s):  
Chatpawee Hom-On ◽  
Mati Horprathum ◽  
Pitak Eiamchai ◽  
Sakson Limwichean ◽  
Viyapol Patthanasetakul ◽  
...  
Keyword(s):  
Aluminum Oxide ◽  
Plasma Treatment ◽  
Photoelectron Spectroscopy ◽  
Oxygen Plasma ◽  
Oxide Films ◽  
Oxygen Plasma Treatment ◽  
Lower Plasma ◽  
Spectroscopic Analyses ◽  
Effect Of Oxygen ◽  
Deposited Films

X-ray photoelectron spectroscopy (XPS) and Spectroscopic Ellipsometry (SE) were used to analyse the effect of oxygen plasma treatment on properties of aluminum oxide thin films. The aluminum oxide films were fabricated using a reactive sputtering system. The as-deposited films were treated with oxygen plasma powered by an RF generator. During the plasma treatment, the pressures were set at 1 x 10-1 to 1x 10-2 mbar, while the RF supplied powers at 100 W and 200 W. It was observed that lower plasma powers and higher pressures resulted in smoother films. The O/Al ratio of the films were found to decrease with increasing plasma powers and pressures. The thickness and refractive index of the films were significantly affected by the oxygen plasma treatment process, which could be related to the change in films’ packing density and the etching at the surface.

scholarly journals Experimental Study on the Laser Transmission Joining of Polystyrene and Titanium

Materials ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 1513 ◽  
Author(s):  
Pin Li ◽  
Jing Li ◽  
Wensheng Tan ◽  
Huixia Liu ◽  
Xiao Wang
Keyword(s):  
Failure Mode ◽  
Photoelectron Spectroscopy ◽  
Joint Strength ◽  
Oxygen Plasma ◽  
Titanium Surface ◽  
Tensile Failure ◽  
Oxygen Plasma Treatment ◽  
Treatment Methods ◽  
X Ray ◽  
Joining Strength

To address the difficulty of joining polystyrene (PS) and titanium by laser transmission joining, two methods—laser treatment of the titanium surface and oxygen plasma treatment of the PS surface—are used to compare the laser transmission joint strengths of the different treatment methods. The results of the experiments find that joining with titanium can be achieved only when PS is treated with oxygen plasma. When the laser-treated surface of titanium is jointed to the oxygen plasma-treated PS, the joint strength is the highest, reaching 6.5 MPa. The joining mechanism of oxygen plasma-treated PS and laser oxidation-treated titanium was investigated by joint tensile failure mode, joint micromorphology observation, contact angle and surface free energy experiments, and X-ray photoelectron spectroscopy (XPS). The results show that the failure mode of the joint is an interfacial failure; the size and amount of bubbles play an important role in the joining strength, and the joints with fine and uniform bubbles have the highest joint strength. The two surface treatment methods can improve the surface energy of the joints, improve the compatibility between the two joining surfaces, and enhance the joint strength. Ti–C and Ti–O chemical bonds are formed at the joints, which are the main reason for the increase in joint strength.

scholarly journals Oxygen-plasma-modified biomimetic nanofibrous scaffolds for enhanced compatibility of cardiovascular implants

2015 ◽  
Vol 6 ◽  
pp. 254-262 ◽  
Author(s):  
Anna Maria Pappa ◽  
Varvara Karagkiozaki ◽  
Silke Krol ◽  
Spyros Kassavetis ◽  
Dimitris Konstantinou ◽  
...  
Keyword(s):  
Tissue Engineering ◽  
Plasma Treatment ◽  
Photoelectron Spectroscopy ◽  
Oxygen Plasma ◽  
Cell Attachment ◽  
Oxygen Plasma Treatment ◽  
Depth Sensing ◽  
Force Microscopy ◽  
Nanofibrous Scaffolds ◽  
Cardiovascular Implants

Electrospun nanofibrous scaffolds have been extensively used in several biomedical applications for tissue engineering due to their morphological resemblance to the extracellular matrix (ECM). Especially, there is a need for the cardiovascular implants to exhibit a nanostructured surface that mimics the native endothelium in order to promote endothelialization and to reduce the complications of thrombosis and implant failure. Thus, we herein fabricated poly-ε-caprolactone (PCL) electrospun nanofibrous scaffolds, to serve as coatings for cardiovascular implants and guide tissue regeneration. Oxygen plasma treatment was applied in order to modify the surface chemistry of the scaffold and its effect on cell attachment and growth was evaluated. The conditions of the surface modification were properly adjusted in order to define those conditions of the treatment that result in surfaces favorable for cell growth, while maintaining morphological integrity and mechanical behavior. Goniometry (contact angle measurements), scanning electron microscopy (SEM), atomic force microscopy (AFM), and X-ray photoelectron spectroscopy (XPS) measurements were used to evaluate the morphological and chemical changes induced by the plasma treatment. Moreover, depth-sensing nanoindentation was performed to study the resistance of the plasma-treated scaffolds to plastic deformation. Lastly, the cell studies indicated that all scaffolds were cytocompatible, with the plasma-treated ones expressing a more pronounced cell viability and adhesion. All the above findings demonstrate the great potential of these biomimetic tissue-engineering constructs as efficient coatings for enhanced compatibility of cardiovascular implants.

Surface Modification of Chitosan Membranes by Oxygen Plasma Treatment

2009 ◽  
Vol 610-613 ◽  
pp. 1259-1262 ◽  
Author(s):  
Na Ru Zhao ◽  
Ying Jun Wang ◽  
Li Ren ◽  
Xiao Feng Chen
Keyword(s):  
Contact Angle ◽  
Plasma Treatment ◽  
Water Contact Angle ◽  
Photoelectron Spectroscopy ◽  
Oxygen Plasma ◽  
Chamber Pressure ◽  
Oxygen Plasma Treatment ◽  
Water Contact ◽  
Plasma Irradiation ◽  
Chitosan Membranes

Chitosan membranes were prepared by solvent cast method. In order to increase cell adhesion of the chitosan membranes, oxygen plasma treatment was applied to improve the hydrophilicity of the surface of chitosan membranes. The surface properties were characterized by scanning electron microscopy (SEM), contact angle analyzer, X-ray photoelectron spectroscopy (XPS). The effects of exposure time, plasma generating power, and chamber pressure on water contact angle of the chitosan membranes were investigated. The water contact angle of chitosan membranes decreased from 94.1° to 49.2° after plasma treatment. Which suggested the surfaces became more hydrophilic. XPS analysis showed that the oxygen content and the ratio of O/C increased markedly after oxygen plasma treatment. Furthermore, it was found that C-H bonds were broken with oxygen plasma treatment. C-OH group had been increased after plasma irradiation.

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