Phase Behavior and Dewetting for Polymer Blend Films Studied by In Situ AFM and XPS:  From Thin to Ultrathin Films

Langmuir ◽  
2007 ◽  
Vol 23 (22) ◽  
pp. 11107-11111 ◽  
Author(s):  
Yonggui Liao ◽  
Jichun You ◽  
Tongfei Shi ◽  
Lijia An ◽  
Pradip Kumar Dutta
Keyword(s):  
Phase Behavior ◽  
Polymer Blend ◽  
Ultrathin Films ◽  
Blend Films

Effect of In Situ Annealing on Phase Segregation And Optoelectronic Properties of Ultrasonic-Spray Deposited Polymer Blend Films

2020 ◽  
Vol 10 (6) ◽  
pp. 1727-1734 ◽  
Author(s):  
Sobia Waheed ◽  
Saurabh Pareek ◽  
Prerna Singh ◽  
Punit Sharma ◽  
Aniket Rana ◽  
...  
Keyword(s):  
Polymer Blend ◽  
Phase Segregation ◽  
Optoelectronic Properties ◽  
Blend Films ◽  
Ultrasonic Spray

Epitaxial growth manner and structure of superconducting oxide films

1990 ◽  
Vol 48 (4) ◽  
pp. 2-3
Author(s):  
Yoshichika Bando ◽  
Takahito Terashima ◽  
Kenji Iijima ◽  
Kazunuki Yamamoto ◽  
Kazuto Hirata ◽  
...  
Keyword(s):  
Ultrathin Films ◽  
Film Surface ◽  
High Energy ◽  
Epitaxial Films ◽  
Layer By Layer ◽  
Initial Growth ◽  
In Situ Growth ◽  
High Quality ◽  
Activated Reactive Evaporation

The high quality thin films of high-Tc superconducting oxide are necessary for elucidating the superconducting mechanism and for device application. The recent trend in the preparation of high-Tc films has been toward “in-situ” growth of the superconducting phase at relatively low temperatures. The purpose of “in-situ” growth is to attain surface smoothness suitable for fabricating film devices but also to obtain high quality film. We present the investigation on the initial growth manner of YBCO by in-situ reflective high energy electron diffraction (RHEED) technique and on the structural and superconducting properties of the resulting ultrathin films below 100Å. The epitaxial films have been grown on (100) plane of MgO and SrTiO, heated below 650°C by activated reactive evaporation. The in-situ RHEED observation and the intensity measurement was carried out during deposition of YBCO on the substrate at 650°C. The deposition rate was 0.8Å/s. Fig. 1 shows the RHEED patterns at every stage of deposition of YBCO on MgO(100). All the patterns exhibit the sharp streaks, indicating that the film surface is atomically smooth and the growth manner is layer-by-layer.

In Situ Magnetic-Circular-X-Ray-Dichroism Measurements: An Epitaxial Fe Wedge on Cu(100)

MRS Bulletin ◽  
1999 ◽  
Vol 24 (1) ◽  
pp. 41-45 ◽  
Author(s):  
M.E. Dávila ◽  
D. Arvanitis ◽  
J. Hunter Dunn ◽  
N. Mårtensson ◽  
P. Srivastava ◽  
...  
Keyword(s):  
Ultrathin Films ◽  
Magnetic Circular Dichroism ◽  
Polarized Light ◽  
Measured Quantity ◽  
Easy Magnetization ◽  
Magnetization Direction ◽  
Core Electron ◽  
Circularly Polarized ◽  
X Ray

Circularly polarized x-ray radiation is attracting increasing interest as a tool for the characterization of the electronic, magnetic, and chiral properties of low-dimensional structures. Using circular light (with electric field vector parallel to the orbital plane), a dependence of the measured quantity by changing either the orientation of the light polarization or the magnetization is indicative of the existence of magnetic circular dichroism. It can be observed in x-ray absorption spectroscopy (XAS), in which the photon energy is scanned through an absorption threshold exciting a core electron into an unoccupied valence state using circularly polarized light. Synchrotron radiation sources have made this technique possible. It can also be observed in photo-emission spectroscopy from core and valence levels. Here we focus on magnetic circular x-ray dichroism (MCXD) in XAS as an element-specific tool to investigate magnetic properties of ultrathin films in situ. The application of magneto-optical sum rules enables the determination of the orbital and spin magnetic moments per atom from XAS spectra, as well as the easy magnetization direction.MCXD-based magnetometry in XAS is extensively used by measuring the L absorption edges of 3d-transition metals, where large intensity changes (up to 60%) of the L-edge white lines are observed upon reversal of either the sample magnetization or the light helicity. The high magnetic contrast obtained, combined with the elemental specificity of the technique, allows for the study of very dilute samples such as ultrathin films. We first concentrate on the selection rules governing MCXD in XAS.

scholarly journals Structural, Thermal, Optical Characterizations of PANI/PMMA Composite Doped by TiO2 as an Application in Optoelectronic Devices

2021 ◽  
Author(s):  
Q. A. Alsulami ◽  
A. A. Rajeh
Keyword(s):  
Thin Films ◽  
Polymer Blend ◽  
Crystal Size ◽  
Casting Method ◽  
Third Order ◽  
Blend Films ◽  
High Efficient ◽  
Amorphous Nature ◽  
Reflectance Coefficient ◽  
Vibrational Bands

Abstract The casting method was employed for the preparation of polymer blend films doped with TiO2 (0.5, 1, 1.5, and 2.3 wt.%). The XRD outcomes show that TiO2 phase formation is anatase, with an average crystal size of 20.25 nm. PANI/PMMA-TiO2 nanocomposites samples have an amorphous nature. In addition, the degree of amorphousity is increased with the increase of the content of the TiO2 NPs. The FTIR method was employed for presenting the vibrational bands of the nanocomposites and the intermolecular bonding of the blend with the TiO2 NPs. The applied investigation involved the optical constant like absorption as well as t90-etransmission spectra, refractive index, reflectance, coefficient extinction, dielectric constant’ imaginary and real parts, the susceptibility (χ3) of third order and the optical band gaps. The optical band gap (Eg) values of the films of fabricated nanocomposites was lower upon doping (≤ 1.5 wt.%). The reduction of the value happened due to the introduction of the preselected TiO2 NPs into thin films. Such values significantly match the values which were revealed by the Tauc technique. It was proved through DSC and TGA techniques that TiO2 NPs can lead to the enhancement of the polymer blend in terms of thermal stability. As displayed by the DSC analysis, there is a single Tg of the polymer blend (PANI/PMMA), which prove their miscibility. The optical constants displayed by the experimental results show noticeable changes upon raising the doping concentrations. The resultant doped thin films indicate that the fabricating high-efficient optoelectronic machines are greatly promising.

Selective Chain Alignment of Conducting Polymer Blend Films by an Ultrafast Laser

2015 ◽  
Vol 217 (4) ◽  
pp. 537-542 ◽  
Author(s):  
Sangmin Chae ◽  
Kuk Hyun Jo ◽  
Si Woo Lee ◽  
Hee-Sung Keum ◽  
Hyo Jung Kim ◽  
...  
Keyword(s):  
Conducting Polymer ◽  
Polymer Blend ◽  
Ultrafast Laser ◽  
Blend Films ◽  
Chain Alignment

In-situ elastomer composite based on fluorocarbon elastomer/liquid crystalline polymer blend

2005 ◽  
Vol 11 (8-9) ◽  
pp. 657-672 ◽  
Author(s):  
E. Shivakumar ◽  
C. K. Das ◽  
K. N. Pandey ◽  
S. Alam ◽  
G. N. Mathur
Keyword(s):  
Polymer Blend ◽  
Liquid Crystalline Polymer ◽  
Liquid Crystalline ◽  
Crystalline Polymer

Energy Landscape of Vertically Anisotropic Polymer Blend Films toward Highly Efficient Polymer Light-Emitting Diodes (PLEDs)

2018 ◽  
Vol 28 (8) ◽  
pp. 1705903 ◽  
Author(s):  
Muhammad Umair Hassan ◽  
Yee-Chen Liu ◽  
Ali K. Yetisen ◽  
Haider Butt ◽  
Richard Henry Friend
Keyword(s):  
Polymer Blend ◽  
Light Emitting Diodes ◽  
Energy Landscape ◽  
Light Emitting ◽  
Blend Films ◽  
Highly Efficient ◽  
Polymer Light Emitting Diodes
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