Luminescence Behavior of Self-Assembled Multilayer Heterostructures of Poly (Phenylenevinylene)

1993 ◽  
Vol 328 ◽  
Author(s):  
Marysilvia Ferreira ◽  
M. F. Rubner ◽  
B. R. Hsieh
Keyword(s):  
Self Assembly ◽  
Phenylene Vinylene ◽  
Multilayer Thin Film ◽  
Sulfonated Polystyrene ◽  
Photoinduced Charge Transfer ◽  
Multilayer Heterostructures ◽  
Assembly Technique ◽  
Self Assembled ◽  
Photoinduced Charge ◽  
Luminescence Behavior

ABSTRACTMultilayer thin film heterostrutuctures comprised of alternating layers of a poly (phenylene vinylene) (PPV) precursor and various polyanions were fabricated using a new self-assembly technique. Thermal treatment of these films produced multilayers of the fully conjugated form of PPV. Alternating Multilayers fabricated with inert polyanions such as sulfonated polystyrene exhibited a very strong photoluminescence whereas alternating multilayers fabricated with electron acceptor polyanions such as sulfonated C?O and poly (thiophene acetic acid) displayed a highly quenched luminescence. This latter behavior suggests that self-assembled Multilayers can be used to examine photoinduced charge transfer interactions between PPV and various electron acceptors.

Interlayer Interactions in Self-Assembled Poly(Phenylene Vinylene) Multilayer Heterostructures, Implications for Light-Emitting and Photorectifying Diodes

1994 ◽  
Vol 369 ◽  
Author(s):  
A.C. Fou ◽  
O. Onitsuka ◽  
M. Ferreira ◽  
M.F. Rubner ◽  
B.R. Hsieh
Keyword(s):  
Ultrathin Films ◽  
Self Assembly ◽  
Organic Light Emitting Diodes ◽  
Phenylene Vinylene ◽  
Layer By Layer ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Emission Color ◽  
Multilayer Heterostructures ◽  
Self Assembled

AbstractLayer-by-layer molecular self-assembly has been used to fabricate multilayer heterostructures containing poly(phenylene vinylene) (PPV) and a variety of polyanions. These ultrathin films exhibit widely different photoluminescence intensities and peak positions (emission color) depending on the polyanion used. The characteristics of light-emitting devices based on such films are described. This represents the first demonstration of working organic light-emitting diodes, the active layer of which consists of ultrathin, self-assembled films of between 130 - 500 Å

scholarly journals Electrochemistry Study of Permselectivity and Interfacial Electron Transfers of a Branch-Tailed Fluorosurfactant Self-Assembled Monolayer on Gold

Molecules ◽  
2018 ◽  
Vol 23 (11) ◽  
pp. 2998 ◽  
Author(s):  
Shanshan Li ◽  
Qingying Luo ◽  
Zhiqing Zhang ◽  
Guanghui Shen ◽  
Hejun Wu ◽  
...  
Keyword(s):  
Self Assembly ◽  
Electrochemical Impedance ◽  
Click Reaction ◽  
Hydration Shell ◽  
Self Assembled Monolayer ◽  
Tunneling Mechanism ◽  
Assembly Technique ◽  
Hydration Resistance ◽  
Self Assembled ◽  
Electron Transfers

We investigated the permselectivity and interfacial electron transfers of an amphiphilic branch-tailed fluorosurfactant self-assembled monolayer (FS-SAM) on a gold electrode by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The FS-SAM was prepared by a self-assembly technique and a “click” reaction. The barrier property and interfacial electron transfers of the FS-SAM were also evaluated using various probes with different features. The FS-SAM allowed a higher degree of permeation by small hydrophilic (Cl− and F−) electrolyte ions than large hydrophobic (ClO4− and PF6−) ones. Meanwhile, the redox reaction of the Fe(CN)63− couple was nearly completely blocked by the FS-SAM, whereas the electron transfer of Ru(NH3)63+ was easier than that of Fe(CN)63−, which may be due to the underlying tunneling mechanism. For hydrophobic dopamine, the hydrophobic bonding between the FS-SAM exterior fluoroalkyl moieties and the hydrophobic probes, as well as the hydration resistance from the interior hydration shell around the oligo (ethylene glycol) moieties, hindered the transport of hydrophobic probes into the FS-SAM. These results may have profound implications for understanding the permselectivity and electron transfers of amphiphilic surfaces consisting of molecules containing aromatic groups and branch-tailed fluorosurfactants in their structures.

Layer-by-layer self-assembled laminin/fucoidan films: towards better hemocompatibility and endothelialization

RSC Advances ◽  
2016 ◽  
Vol 6 (61) ◽  
pp. 56048-56055 ◽  
Author(s):  
Yan Wang ◽  
Changrong Ye ◽  
Hong Su ◽  
Juan Wang ◽  
Yanan Wang ◽  
...  
Keyword(s):  
Self Assembly ◽  
Multilayer Film ◽  
Layer By Layer ◽  
Assembly Technique ◽  
Self Assembled

The laminin/fucoidan multilayer film is prepared on glass via layer-by-layer self-assembly technique and monitored the assembled process by QCM-D. This film can inhibit platelets adhesion and improve ECs and EPCs adhesion.

Formation of Antibody Microarrays on Aluminum Nitride Surface Using Patterned Organosilane Self-Assembled Monolayers

2009 ◽  
Vol 1202 ◽  
Author(s):  
Chi-Shun Chiu ◽  
Hong-Mao Lee ◽  
Shangjr Gwo
Keyword(s):  
Aluminum Nitride ◽  
Aluminum Gallium Nitride ◽  
Self Assembly ◽  
Fluorescent Protein ◽  
Specific Protein ◽  
Self Assembled Monolayer ◽  
Antibody Microarrays ◽  
Assembly Technique ◽  
Self Assembled ◽  
Lift Off

AbstractSurface biofunctionalization of group-III nitride semiconductors has recently attracted much interest due to their biocompatibility, nontoxicity, and long-term chemical stability under demanding physiochemical conditions for chemical and biological sensing. Among III-nitrides, aluminum nitride (AlN) and aluminum gallium nitride (AlGaN) are particularly important because they are often used as the sensing surfaces for sensors based on field-effect transistor or surface acoustic wave sensor structures. Patterned self-assembled monolayer (SAM) templates are composed of two types of organosilane molecules terminated with different functional groups (amino and methyl), which were fabricated on AlN/sapphire substrates by combining photolithography, lift-off process, and self-assembly technique. Clear imaging contrast of SAM micropatterns can be observed by field emission scanning electron microscopy (FE-SEM) operating at a low accelerating voltage in the range of 0.5–1.5 kV. In this work, the formation of green fluorescent protein (GFP) antibody microarrays was demonstrated by the specific protein binding of enhanced GFP (EGFP) labeling. The observed strong fluorescent signal from antibody functionalized regions on the SAM-patterned AlN surface indicates the retained biological activity of specific molecular recognition resulting from the antibody–EGFP interaction. The results reported here show that micropatterning of organosilane SAMs by the combination of photolithographic process and lift-off technique is a practical approach for the fabrication of reaction regions on AlN-based bioanalytical microdevices.

Photoinduced charge transfer in poly(p-phenylene vinylene) derivatives and carbon nanotube/C60 composites

2003 ◽  
Vol 338 (1-4) ◽  
pp. 366-369 ◽  
Author(s):  
C. Yang ◽  
M. Wohlgenannt ◽  
Z.V. Vardeny ◽  
W.J. Blau ◽  
A.B. Dalton ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Carbon Nanotube ◽  
Phenylene Vinylene ◽  
Photoinduced Charge Transfer ◽  
Photoinduced Charge

Self-assembled BiVO4/Bi2WO6 microspheres: synthesis, photoinduced charge transfer properties and photocatalytic activities

2015 ◽  
Vol 44 (26) ◽  
pp. 11725-11731 ◽  
Author(s):  
Haimei Fan ◽  
Dejun Wang ◽  
Zhipeng Liu ◽  
Tengfeng Xie ◽  
Yanhong Lin
Keyword(s):  
Charge Transfer ◽  
Solvothermal Method ◽  
Photoinduced Charge Transfer ◽  
One Pot ◽  
Photocatalytic Activities ◽  
Template Free ◽  
Self Assembled ◽  
Photoinduced Charge ◽  
Transfer Properties

A series of BiVO4/Bi2WO6 microspheres was synthesized by a simple, one-pot, template-free, solvothermal method.

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