Limitations of threshold voltage engineering of AlGaN/GaN heterostructures by dielectric interface charge density and manipulation by oxygen plasma surface treatments

2016 ◽  
Vol 119 (20) ◽  
pp. 205705 ◽  
Author(s):  
G. Lükens ◽  
H. Yacoub ◽  
H. Kalisch ◽  
A. Vescan
Keyword(s):  
Charge Density ◽  
Threshold Voltage ◽  
Oxygen Plasma ◽  
Surface Treatments ◽  
Dielectric Interface ◽  
Plasma Surface ◽  
Interface Charge

scholarly journals On the Effectiveness of Oxygen Plasma and Alkali Surface Treatments to Modify the Properties of Polylactic Acid Scaffolds

Polymers ◽  
2021 ◽  
Vol 13 (10) ◽  
pp. 1643
Author(s):  
Ricardo Donate ◽  
María Elena Alemán-Domínguez ◽  
Mario Monzón
Keyword(s):  
Surface Properties ◽  
Enzymatic Degradation ◽  
Oxygen Plasma ◽  
Physicochemical Characterization ◽  
Surface Treatments ◽  
Carboxyl Groups ◽  
Scanning Calorimetry ◽  
Water Contact ◽  
Angle Measurements ◽  
3D Printed

Surface modification of 3D-printed PLA structures is a major issue in terms of increasing the biofunctionality and expanding the tissue engineering applications of these parts. In this paper, different exposure times were used for low-pressure oxygen plasma applied to PLA 3D-printed scaffolds. Alkali surface treatments were also evaluated, aiming to compare the modifications introduced on the surface properties by each strategy. Surface-treated samples were characterized through the quantification of carboxyl groups, energy-dispersive X-ray spectroscopy, water contact angle measurements, and differential scanning calorimetry analysis. The change in the surface properties was studied over a two-week period. In addition, an enzymatic degradation analysis was carried out to evaluate the effect of the surface treatments on the degradation profile of the 3D structures. The physicochemical characterization results suggest different mechanism pathways for each type of treatment. Alkali-treated scaffolds showed a higher concentration of carboxyl groups on their surface, which enhanced the enzymatic degradation rate, but were also proven to be more aggressive towards 3D-printed structures. In contrast, the application of the plasma treatments led to an increased hydrophilicity of the PLA surface without affecting the bulk properties. However, the changes on the properties were less steady over time.

scholarly journals An Assessment of Surface Treatments for Adhesion of Polyimide Thin Films

Polymers ◽  
2021 ◽  
Vol 13 (12) ◽  
pp. 1955
Author(s):  
Marco Cen-Puc ◽  
Andreas Schander ◽  
Minerva G. Vargas Gleason ◽  
Walter Lang
Keyword(s):  
Flexible Electronics ◽  
Oxygen Plasma ◽  
Reactive Ion Etching ◽  
Peel Test ◽  
Scratch Test ◽  
Peel Strength ◽  
Surface Treatments ◽  
Oxygen Plasma Treatment ◽  
Polyimide Films ◽  
Ion Etching

Polyimide films are currently of great interest for the development of flexible electronics and sensors. In order to ensure a proper integration with other materials and PI itself, some sort of surface modification is required. In this work, microwave oxygen plasma, reactive ion etching oxygen plasma, combination of KOH and HCl solutions, and polyethylenimine solution were used as surface treatments of PI films. Treatments were compared to find the best method to promote the adhesion between two polyimide films. The first selection of the treatment conditions for each method was based on changes in the contact angle with deionized water. Afterward, further qualitative (scratch test) and a quantitative adhesion assessment (peel test) were performed. Both scratch test and peel strength indicated that oxygen plasma treatment using reactive ion etching equipment is the most promising approach for promoting the adhesion between polyimide films.

scholarly journals Plasma Surface Treatments of Nonwovens

10.5772/61307 ◽  
2016 ◽  
Author(s):  
Burçak Karagüzel Kayaoglu
Keyword(s):  
Surface Treatments ◽  
Plasma Surface

Modeling on oxide dependent 2DEG sheet charge density and threshold voltage in AlGaN/GaN MOSHEMT

2016 ◽  
Vol 37 (4) ◽  
pp. 044003 ◽  
Author(s):  
J. Panda ◽  
K. Jena ◽  
R. Swain ◽  
T. R. Lenka
Keyword(s):  
Charge Density ◽  
Threshold Voltage ◽  
Sheet Charge

7.6 V Threshold Voltage High-Performance Normally-Off Al2O3/GaN MOSFET Achieved by Interface Charge Engineering

2016 ◽  
Vol 37 (2) ◽  
pp. 165-168 ◽  
Author(s):  
Qi Zhou ◽  
Li Liu ◽  
Anbang Zhang ◽  
Bowen Chen ◽  
Yang Jin ◽  
...  
Keyword(s):  
Threshold Voltage ◽  
High Performance ◽  
Interface Charge

In vivo stimulation of bone formation by aluminum and oxygen plasma surface-modified magnesium implants

Biomaterials ◽  
2013 ◽  
Vol 34 (38) ◽  
pp. 9863-9876 ◽  
Author(s):  
Hoi Man Wong ◽  
Ying Zhao ◽  
Vivian Tam ◽  
Shuilin Wu ◽  
Paul K. Chu ◽  
...  
Keyword(s):  
Bone Formation ◽  
Oxygen Plasma ◽  
Plasma Surface ◽  
Surface Modified ◽  
Stimulation Of

Effects of plasma surface treatments of diamond-like carbon and polymeric substrata on the cellular behavior of human fibroblasts

2011 ◽  
Vol 27 (6) ◽  
pp. 669-683 ◽  
Author(s):  
Carmen López-Santos ◽  
Mar Fernández-Gutiérrez ◽  
Francisco Yubero ◽  
Blanca Vazquez-Lasa ◽  
José Cotrino ◽  
...  
Keyword(s):  
Human Fibroblasts ◽  
Surface Treatments ◽  
Diamond Like Carbon ◽  
Cellular Behavior ◽  
Plasma Surface
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