Heterojunction of Hydrophobic Poly(1,4-phenylenevinylene) and Hydrophilic PEDOT:PSS on Hydrophilic CdS Nanoparticles

2008 ◽  
Vol 8 (9) ◽  
pp. 4730-4733 ◽  
Author(s):  
Wonjoo Lee ◽  
Su Jin Baek ◽  
Sun Ki Min ◽  
Gangri Cai ◽  
Joong Ki Lee ◽  
...  
Keyword(s):  
Thermal Treatment ◽  
Water Soluble ◽  
Cds Nanoparticles ◽  
Layer By Layer ◽  
Deposition Method ◽  
Water Contact ◽  
Styrene Sulfonate ◽  
Layer Deposition ◽  
Poly Styrene Sulfonate ◽  
Positively Charged

Heterojunction of hydrophobic poly(1,4-phenylenevinylene) (PPV) on hydrophilic CdS nanoparticles was successfully prepared by the multi-layering of poly(p-xylene tetrahydrothiophenium chloride) (pre-PPV: precursor of PPV polymer) and poly(3,4-ethylenedioxythiophene)/poly(styrene sulfonate) (PEDOT:PSS) in an aqueous solution followed by a thermal treatment. CdS nanoparticles thin films were prepared on tin-doped indium oxide (ITO) by a chemical-bath-deposition method. The CdS surface was hydrophilic with low water contact angle of 15°. Positively charged and water-soluble pre-PPV was used to form multilayers with PEDOT:PSS by a layer-by-layer deposition method. Pre-PPV is easily converted to conjugated PPV polymer by a thermal treatment. The CdS nanoparticles-(PPV/PEDOT:PSS) multilayer films constitute efficient acceptor-sensitizer dyad systems, which generate a photocurrent of 2,660 nA/cm2 under the air mass (AM) 1.5 conditions (I = 100 mW/cm2) for sample with 4.5 bilayers.

Tailored High-Tc Superconducting Thin Films Prepared by Layer-By-Layer Deposition with Excimer Laser

1989 ◽  
Vol 169 ◽  
Author(s):  
Tomoji Kawai ◽  
Masaki Kanai ◽  
Hitoshi Tabata ◽  
Shichio Kawai
Keyword(s):  
Thin Films ◽  
Laser Ablation ◽  
Excimer Laser ◽  
Weak Interaction ◽  
Superconducting Thin Films ◽  
Layer By Layer ◽  
Deposition Method ◽  
High Tc ◽  
Excimer Laser Ablation ◽  
Layer Deposition

AbstractBy using 1ayer-by-1ayer successive deposition method with excimer laser ablation, the distance between CuO2 planes in the Bi2Sr2Ca1Cu2Oy superconductor has been controlled and super lattices with concentration modulation of Y and Ca have been formed. From the properties of these ‘Tailored films’, it is suggested that there is an interaction between CuO2 layers across Ca layer to affect the Tc value, but there is a very weak interaction across Bi2O2 blocking layers.

Antibacterial textiles functionalized by layer-by-layer assembly of polyelectrolytes and TiO2photocatalyst

RSC Advances ◽  
2015 ◽  
Vol 5 (49) ◽  
pp. 38859-38867 ◽  
Author(s):  
Gaëlle Carré ◽  
Laurent Garnier ◽  
Janina Moeller-Siegert ◽  
Jean-Pierre Gies ◽  
Valérie Keller ◽  
...  
Keyword(s):  
Solar Light ◽  
Layer By Layer ◽  
E Coli ◽  
Styrene Sulfonate ◽  
Layer By Layer Assembly ◽  
Antibacterial Textiles ◽  
Poly Styrene Sulfonate ◽  
Layer Assembly

Antibacterial photocatalytic textiles with high self-decontaminating activity under solar light againstE. colihave been prepared by sprayed layer-by-layer assembly of TiO2and polyethylenimine or polyanionic poly(styrene sulfonate) polyelectrolyte.

scholarly journals Nanoparticle-Doped Hybrid Polyelectrolyte Microcapsules with Controlled Photoluminescence for Potential Bioimaging Applications

Polymers ◽  
2021 ◽  
Vol 13 (23) ◽  
pp. 4076
Author(s):  
Galina Nifontova ◽  
Victor Krivenkov ◽  
Mariya Zvaigzne ◽  
Anton Efimov ◽  
Evgeny Korostylev ◽  
...  
Keyword(s):  
Semiconductor Nanocrystals ◽  
Emission Spectra ◽  
Fluorescent Imaging ◽  
Water Soluble ◽  
Layer By Layer ◽  
Layer Deposition ◽  
Theranostic Agents ◽  
Further Development ◽  
Oppositely Charged ◽  
Transformation Processes

Fluorescent imaging is widely used in the diagnosis and tracking of the distribution, interaction, and transformation processes at molecular, cellular, and tissue levels. To be detectable, delivery systems should exhibit a strong and bright fluorescence. Quantum dots (QDs) are highly photostable fluorescent semiconductor nanocrystals with wide absorption spectra and narrow, size-tunable emission spectra, which make them suitable fluorescent nanolabels to be embedded into microparticles used as bioimaging and theranostic agents. The layer-by-layer deposition approach allows the entrapping of QDs, resulting in bright fluorescent microcapsules with tunable surface charge, size, rigidity, and functional properties. Here, we report on the engineering and validation of the structural and photoluminescent characteristics of nanoparticle-doped hybrid microcapsules assembled by the deposition of alternating oppositely charged polyelectrolytes, water-soluble PEGylated core/shell QDs with a cadmium selenide core and a zinc sulfide shell (CdSe/ZnS), and carboxylated magnetic nanoparticles (MNPs) onto calcium carbonate microtemplates. The results demonstrate the efficiency of the layer-by-layer approach to designing QD-, MNP-doped microcapsules with controlled photoluminescence properties, and pave the way for the further development of next-generation bioimaging agents based on hybrid materials for continuous fluorescence imaging.

Conductivity of inkjet-printed PEDOT:PSS-SWCNTs on uncoated papers

2012 ◽  
Vol 27 (2) ◽  
pp. 486-495 ◽  
Author(s):  
Peter D. Angelo ◽  
Ramin R. Farnood ◽  
Rana N. Sodhi ◽  
Gregory B. Cole
Keyword(s):  
Carbon Nanotubes ◽  
Kraft Pulp ◽  
Conductive Ink ◽  
Conductive Layer ◽  
Styrene Sulfonate ◽  
Apparent Conductivity ◽  
Rapid Absorption ◽  
Diallyldimethylammonium Chloride ◽  
Poly Styrene Sulfonate ◽  
Positively Charged

Abstract Poly(3,4-ethylenedioxythiopene): poly (styrene-sulfonate), or PEDOT:PSS, as well as singlewalled carbon nanotubes, were incorporated into an inkjet ink. Handsheets were prepared which contained varying amounts of TiO2filler, internal sizing agent, fixation agent, and either softwood or hardwood kraft pulp. The ink was jetted onto the handsheets to form conductive layers with apparent conductivity as high as 0.018 S/cm on internally alkyketene dimer-sized softwood kraft handsheets with no other additives. Internal sizing increased conductivity at low filler loadings by preventing PEDOT:PSS from penetrating into the substrate, resulting in a conductive ink film on the surface of the sample. Unsized handsheets allowed more rapid absorption, and therefore deeper penetration, of the PEDOT:PSS ink, which resulted in a more diffuse conductive layer. The inclusion of a polyethyleneimine retention aid for TiO2filler decreased conductivity significantly even in unfilled sheets by interaction with PSS-counterions. A positively charged fixation agent, poly(diallyldimethylammonium) chloride, reduced PEDOT conductivity through the retention of nonconductive PSS-anions.

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