High transmittance, photoluminescence properties of PANI: PSS multilayer thin films to develop a hole transport layer for OLED application

10.26524/jap9 ◽  
2016 ◽  
Vol 1 (2) ◽  
Author(s):  
Jayamurugan P ◽  
Manoharan D ◽  
Ramadevi K ◽  
Upendar Reddy K ◽  
Subba Rao Y V
Keyword(s):  
Thin Films ◽  
Self Assembly ◽  
Hole Transport ◽  
Transport Layer ◽  
Hole Transport Layer ◽  
Multilayer Thin Films ◽  
Layer By Layer ◽  
Force Microscopy ◽  
Atomic Force ◽  
Assembly Technique

The nanocolloidal solution has been spin coated on the substrate layer-by-layer, a self-assembly technique has used to form the multilayer thin films. The optical and structural properties of self-assembled multilayer thin films were characterized by UV-visible, photoluminescence, X-ray diffraction and atomic force microscopy

scholarly journals Fabrication and Characterization of Antibacterial-active Multilayer Films Based on Keggin Polyoxometalates and Methylene Blue

2010 ◽  
Vol 65 (2) ◽  
pp. 140-146 ◽  
Author(s):  
Dan Chen ◽  
Jun Peng ◽  
Haijun Pang ◽  
Pengpeng Zhang ◽  
Yuan Chen ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Self Assembly ◽  
Multilayer Films ◽  
Photoelectron Spectra ◽  
Layer By Layer ◽  
Force Microscopy ◽  
Atomic Force ◽  
Assembly Technique ◽  
Lbl Films ◽  
Cv Measurements

Two kinds of multilayer films based on Keggin polyoxometalates α-[SiW12O40]4−/α- [PMo12O40]3− and methylene blue have been prepared via the layer-by-layer (LBL) self-assembly technique. The multilayer films were characterized by UV/Vis spectra, atomic force microscopy (AFM) and X-ray photoelectron spectra (XPS). The cyclic voltammetry (CV) measurements have demonstrated that the electrochemical properties of POMs are maintained in the LBL films. The antibacterial activity of the LBL films has also been investigated, which shows a distinct antibacterial effect against Escherichia coli.

Layer-by-Layer Thin Films of Alginate/Chitosan and Hyaluronic Acid/Chitosan with Tunable Thickness and Surface Roughness

2014 ◽  
Vol 783-786 ◽  
pp. 1226-1231 ◽  
Author(s):  
Thiago Bezerra Taketa ◽  
Marisa Masumi Beppu
Keyword(s):  
Thin Films ◽  
Hyaluronic Acid ◽  
Self Assembly ◽  
Polymer Chains ◽  
Layer By Layer ◽  
Natural Polymers ◽  
Force Microscopy ◽  
Atomic Force ◽  
Polyelectrolyte Solutions ◽  
Oppositely Charged

Layer-by-layer (LbL) is a bottom-up technique used for construction of films with self-assembly and self-organizing properties. In most cases, the fundamental driving force for the formation of these films is originated from the electrostatic interaction between oppositely charged species. The charged segments of polyelectrolytes behave as small building units and their orientation and position can be designed to target structures of great complexity. Furthermore, the technique enables the use of various materials, including natural polymers. In this work, we chose the cationic biopolymer chitosan (CHI) and the negative polyelectrolytes sodium alginate (ALG) and hyaluronic acid (HA). The aim of this study was to evaluate the effect of ionic strength (0 versus 200 mM) and pH (3 versus 5) on ALG/CHI and HA/CHI nanostructured multilayered thin films properties. From profilometry and atomic force microscopy (AFM) analyses, changes in thickness and roughness of the coatings were monitored. The presence of salt in polyelectrolyte solutions induced the polymer chains to adopt conformations with more loops and tails and this arrangement in solution was transmitted to films, resulting in rougher surfaces. Furthermore, the film thickness can be precisely controlled by adjusting the pH of the polyelectrolyte solution. The variation of these parameters shows that it is possible to molecularly control chemical and structural properties of nanostructured coatings, thus opening up new possibilities of application (e.g. cell adhesion).

scholarly journals Investigation of Poly(3,4-ethylenedioxythiophene):Poly(styrenesulfonate) Hole Transport Layer for Solution-Processed Polymer Solar Cells

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Chengxi Zhang ◽  
Jiang Cheng ◽  
Xiaoqing Liao ◽  
Xiaojuan Lian ◽  
Jin Zhang ◽  
...  
Keyword(s):  
Isopropyl Alcohol ◽  
Polymer Solar Cells ◽  
Acid Methyl Ester ◽  
Spray Coating ◽  
Hole Transport ◽  
Transport Layer ◽  
Hole Transport Layer ◽  
Force Microscopy ◽  
Atomic Force ◽  
Inverted Polymer Solar Cell

The inverted polymer solar cell was prepared by self-made spray-coating system, and the poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) hole transport layer was studied. 220 nm poly-(3-hexylthiophene):[6,6]-phenylC61butyric-acid methyl-ester (P3HT:PCBM) and 40 nm PEDOT:PSS were deposited on ZnO thin film subsequently by solution spray coating. Different volume of isopropyl alcohol was introduced into PEDOT:PSS to decrease the contact angle and obtain the optimum Marangoni flow. The surface morphology and roughness of PEDOT:PSS films were characterized by atomic force microscopy with varied deposition temperature from 70°C to 160°C. The improvement of power conversion efficiency (PCE) was attributed to the enhancement of vertical phase separation in PEDOT:PSS film, which improved the charge transfer in the bulk cell. The highest PCE of spray-coated PSCs reached 2.80% after postannealing for 10 min.

IMPROVEMENT ON THE PERFORMANCE OF FLEXIBLE CNT-OLED WITH A NANOLAYER OF CFx-LAYER

2010 ◽  
Vol 09 (03) ◽  
pp. 119-122
Author(s):  
KIAN SOO ONG ◽  
ERIC OU
Keyword(s):  
High Performance ◽  
Thick Layer ◽  
Hole Transport ◽  
Transport Layer ◽  
Hole Transport Layer ◽  
Maximum Brightness ◽  
Light Emitting ◽  
Force Microscopy ◽  
Atomic Force ◽  
Luminance Efficiency

High performance organic light emitting diodes (OLEDs) devices were fabricated using transparent and conductive single wall carbon nanotube (SWCNT) anode. The turn-on voltage of 4–4.5 V and a maximum brightness of 2695 cd/m2 and luminance efficiency of > 10 d/A are achieved by adding a thin nano-thick-layer of CF x coating between the SWCNT anode and hole transport layer (HTL). The interaction of this CF x-layer and the CNT anode is studied by atomic force microscopy (AFM). A simple and effective way of patterning the SWCNT anode is demonstrated.

Multi-layer preparation of phthalocyanine dye and diazonium resin using a self-assembly fabrication method

2006 ◽  
Vol 10 (07) ◽  
pp. 991-995 ◽  
Author(s):  
Young-Min Park ◽  
Byung-Soon Kim ◽  
Young-A Son
Keyword(s):  
Thin Films ◽  
Self Assembly ◽  
Deposition Process ◽  
Glass Slide ◽  
The Self ◽  
Fabrication Method ◽  
Force Microscopy ◽  
Atomic Force ◽  
Vis Spectroscopy ◽  
Assembly Technique

By using the electrostatic self-assembly technique, arranged multi-layer thin films composed of diazonium resin as the polycation and phthalocyanine as the anion, were alternately fabricated on a glass slide. The obtained multi-layers were characterized by UV-vis spectroscopy and Atomic Force Microscopy (AFM). The growth of multi-layers formed by the sequential alternative adsorption of diazonium resin and phthalocyanine was observed and determined. The results of UV-vis absorption show that the deposition process is progressive and uniform. In addition, AFM images of the self-assembled multi-layer films reveal that the surface of the films is relatively uniform.

Layer-by-Layer Thin Films of Carbon Nanotubes

2005 ◽  
Vol 901 ◽  
Author(s):  
Marco Palumbo ◽  
Kye Ung Lee ◽  
Byung Tae Ahn ◽  
Anil Suri ◽  
Karl Coleman ◽  
...  
Keyword(s):  
Thin Films ◽  
Carbon Nanotubes ◽  
Self Assembly ◽  
Thin Layers ◽  
Single Wall Carbon Nanotubes ◽  
Layer By Layer ◽  
Force Microscopy ◽  
Atomic Force ◽  
Out Of Plane ◽  
Conductive Thin Films

AbstractLayer-by-layer films incorporating single-wall carbon nanotubes (SWNTs) with anionic or cationic coatings have been prepared. The process of self-assembly was monitored using the quartz microbalance technique, while the morphology of the resulting thin layers was studied with atomic force microscopy. A variety of different architectures have been built up. The dc conductivities of the thin films, in-plane and out-of-plane, were measured at room temperature and contrasted with reference architectures. The results show clearly that the incorporation of SWNTs into the multilayers resulted in electrically conductive thin films.

Molecular Self-Assembly Routes to Optically Functional Thin Films: Electroluminescent Multilayer Structures

1997 ◽  
Vol 488 ◽  
Author(s):  
W. Li ◽  
J. E. Malinsky ◽  
H. Chou ◽  
W. Ma ◽  
L. Geng ◽  
...  
Keyword(s):  
Self Assembly ◽  
Chemical Characterization ◽  
Hole Transport ◽  
Transport Layer ◽  
Electron Transport Layer ◽  
Hole Transport Layer ◽  
Layer By Layer ◽  
Self Assembled ◽  
Precursor Molecules

AbstractThis contribution describes the use of layer-by-layer self-limiting siloxane chemisorption processes to self-assemble structurally regular multilayer organic LED (OLED) devices. Topics discussed include: 1) the synthesis of silyl-functionalized precursor molecules for hole transport layer (HTL), emissive layer (EML), and electron transport layer (ETL) self-assembly, 2) the use of layer-by-layer self-assembly for ITO electrode modification/passivation/hole-electron balancing in a vapor-deposited device, 3) the microstructure/chemical characterization of HTL self-assembly using a prototype triarylamine precursor, 4) fabrication and properties of a hybrid self-assembled + vapor deposited two-layer LED, 4) fabrication and properties of a fully self-assembled two-layer OLED.

Self-assembly layer-by-layer fabrication using porphyrin dye anion and polycation

2009 ◽  
Vol 13 (07) ◽  
pp. 774-778 ◽  
Author(s):  
Byung-Soon Kim ◽  
Young-A Son
Keyword(s):  
Ultrathin Films ◽  
Self Assembly ◽  
Film Surface ◽  
Layer By Layer ◽  
Preparation Technique ◽  
Force Microscopy ◽  
Atomic Force ◽  
Diallyldimethylammonium Chloride ◽  
Afm Analysis ◽  
Progressive Growth

In this study, self-assembled alternating film using poly(diallyldimethylammonium chloride) (PDDAC) and meso-tetrakis(4-carboxyphenyl)porphyrin (MTCP) was prepared as a multilayer deposition on glass substrate. This preparation technique for dye deposition may provide new feasibilities to achieve the manufacture of ultrathin films for nanotechnology application. The deposition films were characterized by UV-vis spectrophotometer and Atomic Force Microscopy (AFM) analysis. The results of UV-vis spectra showed that the absorbance characteristic of the multilayer films linearly increased with an increased number of PDDAC and MTCP bilayers. AFM analysis showed the film surface was relatively uniform and the progressive growth of layers was determined.

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