scholarly journals New Strategy for Inducing Surface Anisotropy in Polyimide Films for Nematics Orientation in Display Applications

Nanomaterials ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 3107
Author(s):  
Elena-Luiza Epure ◽  
Iuliana Stoica ◽  
Raluca Marinica Albu ◽  
Camelia Hulubei ◽  
Andreea Irina Barzic
Keyword(s):  
Liquid Crystals ◽  
Surface Anisotropy ◽  
Polyimide Films ◽  
Alignment Layer ◽  
Display Devices ◽  
Force Microscopy ◽  
Atomic Force ◽  
New Strategy ◽  
Great Relevance ◽  
Novel Strategy

The operability of liquid crystal displays is strongly impacted by the orientation aspects of nematics, which in turn are affected by the alignment layer surface features. In this work, two polyimide (PI) structures are obtained based on a cycloaliphatic dianhydride and aromatic or aliphatic diamines with distinct flexibility. The attained PI films have high transmittance (T) for visible radiations, i.e., at 550 nm T > 80%. Here, a novel strategy for creating surface anisotropy in the samples that combines rubbing with a cloth and stretching via pressing is reported. Birefringence and atomic force microscopy (AFM) scans reveal that the generated orientation of the chains is affected by the chemical structure of the polymer and order of the steps involved in the surface treatment. Molecular modeling computations and wettability tests show that the PI structure and produced surface topography are competitive factors, which are impacting the intensity of the interactions with the nematic liquid crystals. The achieved results are of great relevance for designing of reliable display devices with improved uniform orientation of liquid crystals.

Preparation and Characterization Silver and Copper Layers on Polyimide Prepared by Electroless Copper Plating

2006 ◽  
Vol 947 ◽  
Author(s):  
Eun Sun Ji ◽  
Young Hwan Kim ◽  
Young Soo Kang
Keyword(s):  
Polyimide Film ◽  
Metallic Silver ◽  
Polyimide Films ◽  
Electroless Copper Plating ◽  
X Ray ◽  
Force Microscopy ◽  
Atomic Force ◽  
Ag Particles ◽  
Plating Method ◽  
Surface Image

ABSTRACTAg particles were generated on Ag+-doped polyimide film by ion exchanging, followed by copper deposition using metallic silver particles as seeds. The Cu layers were coated on the surface of polyimide films by electroless plating method. The surface image and morphology of Cu layers on the polyimide films were characterized with scanning electron microscopy (SEM), and atomic force microscopy (AFM). The chemical composition on the PI film was investigated energy dispersive X-ray (EDX) spectrometer.

PLATING OF COPPER LAYERS ON POLYIMIDES USING ELECTROLESS PLATING BY SURFACE MODIFICATION

2007 ◽  
Vol 14 (04) ◽  
pp. 593-596 ◽  
Author(s):  
EUN SUN JI ◽  
YOUNG HWAN KIM ◽  
YONG CHEOL KANG ◽  
YOUNG SOO KANG ◽  
BYUNG HYUN AHN
Keyword(s):  
Electroless Plating ◽  
Electroless Deposition ◽  
Solution Treatment ◽  
Polyimide Films ◽  
Force Microscopy ◽  
Angle Measurements ◽  
Atomic Force ◽  
Plating Method ◽  
Contact Angle Measurements ◽  
Activated Surface

This work describes electroless deposition of copper layers onto a polyimide (PI) film. The film was modified by etching with 1.0 M KOH solution treatment, and an activated Ag thin film was developed on this surface using 0.1 M AgNO 3. The Cu layers were coated on the activated surface of polyimide films by electroless plating method. The thickness and surface morphology of Cu layers on the PI films were characterized with atomic force microscopy. The surface properties of PI film were identified with contact angle measurements.

scholarly journals Fabrication and Nanoscale Properties of PEDOT:PSS Conducting Polymer Nanospheres

2021 ◽  
Author(s):  
Matteo Sanviti ◽  
Angel Alegria ◽  
Daniel E Martínez-Tong
Keyword(s):  
Physical Properties ◽  
Spherical Shape ◽  
Step Method ◽  
Force Microscopy ◽  
Styrene Sulfonate ◽  
Electrically Conducting ◽  
Atomic Force ◽  
One Step ◽  
Novel Strategy ◽  
Poly Styrene Sulfonate

<div><div><div><p>Electrically conducting nanospheres of poly-(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) with tailored size, were prepared by a one-step method. To fabricate the nanostructures, PEDOT:PSS was dissolved in ethylene glycol using a novel strategy and the solution was precipitated in deionized water. The proposed fabrication route allowed to obtain a water-based dispersion of monodisperse nanospheres with good optical properties. To determine physical properties of the nanospheres, we followed a nanoscale approach, using Atomic Force Microscopy (AFM). Our nanoscale mechanical and electrical investigations showed that the nanospheres preserved good physical properties, compared to the commercial product. Moreover, the local studies indicated that the confinement imposed by the spherical shape can lead into a different arrangement of the PSS and PEDOT phases. In particular, we envisaged nanospheres composed by a PEDOT-rich surface, responsible for the good electrical conductivity of the nanostructures.</p></div></div></div>

Atomic force microscopy of mechanically rubbed and optically buffed polyimide films

1998 ◽  
Vol 25 (5) ◽  
pp. 597-601 ◽  
Author(s):  
K. R. BROWN ◽  
D. A. BONNELL ◽  
S.-T. SUN
Keyword(s):  
Atomic Force Microscopy ◽  
Polyimide Films ◽  
Force Microscopy ◽  
Atomic Force

scholarly journals Synthesis and characterization of polyimide thin films obtained by thermal evaporation and solid state reaction

2016 ◽  
Vol 34 (1) ◽  
pp. 132-136 ◽  
Author(s):  
Ikram Atta Al-Ajaj ◽  
Aseel A. Kareem
Keyword(s):  
Thin Films ◽  
Solid State ◽  
Solid State Reaction ◽  
Physical Vapor Deposition ◽  
Amic Acid ◽  
Surface Topology ◽  
Polyimide Films ◽  
Force Microscopy ◽  
Atomic Force ◽  
Ft Ir

AbstractIn this research polyimide films were prepared by physical vapor deposition (PVD), using solid state reaction of pyromellitic dianhydride (PMDA) and p-phenylene diamine (PDA) to form poly(amic acid) (PAA) films. The resultant films were converted to polyimide by thermal treatment, usually below 300 °C. For this study, a FT-IR spectrometer has been used to measure the effect of imidization temperature on the chemical structure of the vapor-deposited thin films of aromatic PI. When temperature increased, an increase in all absorption peaks was observed. This suggests that residual PAA monomers continued to be converted into PI. The surface topology of the PI films obtained at imidization temperatures of 150, 200, 250 °C for 1 hour was further examined by using AFM atomic force microscopy. It can be clearly seen that the surface became rougher with increasing imidization temperature. The thermal stability of polyimide was also studied by using thermogravimetric analysis (TGA).

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