scholarly journals Flexible Conductive Polymer Film Grafted with Azo-Moieties and Patterned by Light Illumination with Anisotropic Conductivity

Polymers ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 1856 ◽  
Author(s):  
Yevgeniya Kalachyova ◽  
Olga Guselnikova ◽  
Vladimir Hnatowicz ◽  
Pavel Postnikov ◽  
Vaclav Švorčík ◽  
...  
Keyword(s):  
Conductive Polymer ◽  
Film Surface ◽  
Electric Properties ◽  
Light Illumination ◽  
Polystyrene Sulfonate ◽  
Anisotropic Conductivity ◽  
Linear Pattern ◽  
Lithographic Mask ◽  
The Creation ◽  
Local Illumination

In this work, we present the method for the creation of an anisotropic electric pattern on thin poly(3,4-ethylenedioxythiophene): polystyrene sulfonate (PEDOT:PSS) films through PSS grafting by azo-containing moieties followed by light-induced polymers redistribution. Thin PEDOT:PSS films were deposited on the flexible and biodegradable polylactic acid (PLLA) substrates. The light-sensitive azo-groups were grafted to PSS using the diazonium chemistry followed by annealing in methanol. Local illumination of azo-grafted PEDOT:PSS films through the lithographic mask led to the conversion of azo-moieties in Z-configuration and further creation of the lateral gradient of azo-isomers along the film surface. The concentration gradient led to the migration of PSS away from the illuminated area, increasing the PEDOT chains’ concentration and the corresponding increase of local electrical conductivity in the illuminated place. Utilization of mask with linear pattern results in the appearance of conductive PEDOT-rich and non-conductive PSS-rich lines on the film surface, and final, lateral anisotropy of electric properties. Our work gives an optical lithography-based alternative to common methods for the creation of anisotropic electric properties, based on the spatial confinement of conductive polymer structures or their mechanical strains.

Effective film surface treatment for improving external quantum efficiency of photomultiplication type organic photodetector

2021 ◽  
pp. 095400832110214
Author(s):  
Zheng Xiao ◽  
Haitao Xu ◽  
Wenyue Liang ◽  
Binfang Wu ◽  
Yufeng Shi ◽  
...  
Keyword(s):  
Quantum Efficiency ◽  
Active Layer ◽  
External Quantum Efficiency ◽  
Film Surface ◽  
Electrical Performance ◽  
Hole Injection ◽  
Light Illumination ◽  
Methanol Treatment ◽  
Organic Photodetector ◽  
Response Current

A simple yet effective method based on methanol treatment is proposed to enhance the external quantum efficiency (EQE) of the photomultiplication type organic photodetector with a structure of Glass/ITO/PEDOT:PSS/P3H:PC71BM (100:1, wt./wt.)/Al. By modifying the PEDOT:PSS film surface with methanol, the EQE of photodetector significantly improved within a broad wavelength range of 300–700 nm. The maximum EQE of 25300% occurs at the wavelength of 350 nm in the methanol-treated device under −9 V bias, which more than doubles that (11500%) of the device without treatment. In addition, as a result of the methanol treatment, the detectivity of the device improved from 3.72 × 1012 to 7.24 × 1012 Jones at −9 V under 350 nm light illumination. The large improvement is attributed to the fact that the methanol treatment can improve the electrical performance of the PEDOT:PSS by removing the insulator PSS within the film and also result in PC71BM aggregations in the active layer. The latter can enhance the tunneling hole injection by the intensified energy-level bending, which is induced by both the trapped electrons in these aggregations and accumulated ones near Al electrode. As a result, the modification of both the PEDOT:PSS layer and the active layer increases the response current, resulting in the EQE improvement.

Utilization of Industrial Inkjet Technologies for the Deposition of Conductive Polymers, Functional Oxides and CNTs

2011 ◽  
Vol 1340 ◽  
Author(s):  
Wolfgang Voit ◽  
Ingo Reinhold ◽  
Werner Zapka ◽  
Lyubov Belova ◽  
K.V. Rao
Keyword(s):  
Carbon Nanotube ◽  
Line Width ◽  
Conductive Polymer ◽  
Functional Materials ◽  
Polystyrene Sulfonate ◽  
Functional Oxides ◽  
Single Pass ◽  
Deposition Processes ◽  
Novel Applications ◽  
Printing Processes

ABSTRACTPrinting of functional materials requires reliable deposition processes. This work describes the development of printing processes for selected functional materials utilizing industrial-type inkjet printheads. A well-controlled printing process with fluids containing the conductive polymer poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) is presented, allowing linear printing speeds of up to 0.35 m/s in single-pass, and smallest line width of approximately 40 μm when printing 7 pL drop volumes. In addition reliable processes for producing ZnO-based films, which enable novel applications for electronic and UV-sensitive devices, and for printing of conductive carbon nanotube layers are shown.

A Unique Platinum/Titania/Polymer Based Hybrid Organic-Inorganic Heterostructure for Enhanced Photocatalytic Activity

2020 ◽  
Vol 01 ◽  
Author(s):  
William Ragsdale ◽  
Rikelli Zanette ◽  
Ana Paula Electo ◽  
Vaidyanathan Ravi Subramanian ◽  
Satyajit Gupta
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Charge Separation ◽  
Conductive Polymer ◽  
Building Blocks ◽  
Catalyst System ◽  
Oxide Semiconductor ◽  
Redox Activity ◽  
Light Illumination ◽  
Light Absorbance

Abstract: This work delineates synthesis, characterization, and photocatalytic activity of a ‘hybrid organicinorganic’ catalyst system, that consists of titanium dioxide (TiO2), platinum (Pt) and a conductive polymer (polypyrrole). The nanocomposite photocatalyst was developed to enhance exciton separation in the large band-gap oxide semiconductor (TiO2) by depositing a noble metal co-catalyst (Pt) at the surface. The hybrid nanocomposite was constructed through sequential sequestration of the building blocks i.e., the monomer (pyrrole) and the metal (Pt) salt, using a photo-deposition technique. At the same time, improvement for light absorbance as compared to pristine TiO2 was realized through the deposition of a conducting polymer (polypyrrole) at the surface of the semiconductor. The polypyrrole provides a pathway for hole migration, thereby increasing the overall lifetime of the separated charges. The benefit of this architecture is demonstrated through an enhanced degradation (~40% increase) of an industrial dye, methyl orange as a representative example, under visible-light illumination compared to unmodified TiO2. Furthermore, photo(electro)chemical analysis of the composite offered valuable insights into the charge transport mechanism. It led to the conclusion that photoillumination results in the participating components to (a) enable visible light absorbance and, (b) facilitate charge separation and utilization at the hetero-interfaces leading to redox activity. Insights into the mechanism of charge separation and transport from chronopotentiometric analysis suggest that the assembly is successful and works as desired

scholarly journals PEDOT:PSS/PDMS-Coated Cotton Fabric for Strain and Moisture Sensors

Proceedings ◽  
2021 ◽  
Vol 68 (1) ◽  
pp. 1
Author(s):  
Granch Berhe Tseghai ◽  
Benny Malengier ◽  
Kinde Anlay Fante ◽  
Lieva Van Langenhove
Keyword(s):  
Cotton Fabric ◽  
Polyethylene Oxide ◽  
Surface Resistance ◽  
Conductive Polymer ◽  
Strain Sensor ◽  
Polystyrene Sulfonate ◽  
Moisture Sensor ◽  
Coated Fabric ◽  
Textile Fabric ◽  
Coated Cotton

In this work, we have successfully developed a flexible, lightweight, and washable strain and moisture sensor textile fabric by printing poly(3,4-ethylenedioxythiophene) polystyrene sulfonate/polydimethylsiloxane-b-polyethylene oxide (PEDOT:PSS/PDMS) conductive polymer composite on knitted cotton fabric. A 60.2 kΩ/sq surface resistance has been obtained at a 30% ratio of PDMS to PEDOT:PSS at 0.012 g/cm2 solid add-on. The coated fabric was washed at 30 °C for 30 min in the presence of a standard detergent. It was observed that there was a 5.3% increase in surface resistance, i.e., 63.4 kΩ/sq. After coating, the fabric could still be stretched up to the infliction elongation of the fabric, i.e., 40%, with a significant change in surface resistance that makes it usable as a strain sensor. In addition, the conductive fabric showed a drop in surface resistance with an increase of the moisture regain up to 150%.

scholarly journals Chemically Bonded N-PDI-P/WO3 Organic-Inorganic Heterojunction with Improved Photoelectrochemical Performance

Catalysts ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 122
Author(s):  
Cheng Feng ◽  
Xihong Mi ◽  
Dingwen Zhong ◽  
Weiming Zhang ◽  
Yongping Liu ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Organic Semiconductors ◽  
Water Oxidation ◽  
High Performance ◽  
Film Surface ◽  
Photogenerated Electron ◽  
Photocurrent Density ◽  
Light Illumination ◽  
Photoelectrochemical Performance ◽  
Highest Occupied Molecular Orbital

The chemical bonding of bandgap adjustable organic semiconductors with inorganic semiconducting materials is effective in constructing a high-performance heterogeneous photoanode. In this study, a new asymmetric perylene diimide derivative molecule (N-PDI-P) was synthesized by connecting tert-butoxycarbonyl on an N-site at one end of a PDI molecule through methylene and connecting naphthalene directly onto the other end. This molecule was bonded onto the WO3 film surface, thereby forming the photoanode of organic-inorganic heterojunction. Under light illumination, the photocurrent density of chemically bonded N-PDI-P/WO3 heterojunction was twofold higher than that of physically adhered heterojunction for photoelectrochemical water oxidation at 0.6 V (vs. Ag/AgCl). Energy band structure and charge transfer dynamic analyses revealed that photogenerated electron carriers on the highest occupied molecular orbital (HOMO) of an N-PDI-P molecule can be transferred to the conduction band of WO3. The charge transfer and separation rates were accelerated considerably after the chemical bond formed at the N-PDI-P/WO3 interface. The proposed method provides a new way for the design and construction of organic-inorganic composite heterojunction.

The Surface Morphology Effects on Liquid Crystal Alignment After Photo-Agitation and Crosslinking of Polyimide

2020 ◽  
Vol 20 (8) ◽  
pp. 5112-5116
Author(s):  
Dong Myung Shin
Keyword(s):  
Carbon Dioxide ◽  
Liquid Crystal ◽  
Uv Light ◽  
Film Surface ◽  
Decomposition Reaction ◽  
Light Illumination ◽  
Anchoring Energy ◽  
Photo Alignment ◽  
Alignment Layers ◽  
Azimuthal Anchoring Energy

The photo-reactive activators are highly reactive radical generators upon the ultraviolet (UV) light illumination. The photo-reactive initiators produced nitrogen radical and alkyl radical after releasing carbon dioxide. The radicals could react with polyimide (PI) main chains. These reactions enforced the alignment layers and exhibited high azimuthal anchoring energy. The thickness of photo-irradiated PI alignment layers were reduced dramatically by photo-induced crosslinking, which induced surface wrinkling and roughness. The carbon dioxide gases released from the thin films produced many micro-pores, which provides tight anchoring of liquid crystal (LC) molecules. The azimuthal anchoring energy obtain by photo-alignment was better than that obtain by rubbing method with the same PI. The maximum value was 6.92×10−5 J/m2. Small aliphatic hydrocarbons, such as methane and propene, were released during photo-decomposition reaction from the PI surface. The polarity of film surface became more hydrophilic. The photo-alignment of LC was perpendicular to the polarization axis of UV light. On the basis of high anchoring energy, the rough surface, hydrophilic surface, and rapid photo-reactions, the photo-alignment mechanism is proposed.

Spatial Distribution of Active Sites for Plasmon-Induced Chemical Reactions Triggered by Well-Defined Plasmon Modes

Nanoscale ◽  
2021 ◽  
Author(s):  
Hiro Minamimoto ◽  
Takahiro Toda ◽  
Kei Murakoshi
Keyword(s):  
Spatial Distribution ◽  
Energy Conversion ◽  
Chemical Reactions ◽  
Active Sites ◽  
Near Infrared ◽  
Oxidative Polymerization ◽  
Conductive Polymer ◽  
Infrared Light ◽  
Light Illumination ◽  
Plasmon Modes

Plasmon-induced chemical reactions triggered by near-infrared light illumination might enable efficient photo energy conversion. Here, electrochemical oxidative polymerization of a conductive polymer is conducted on plasmonic photoconversion electrodes. The absolute...

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