Preparation of Ultrathin Nanocomposite Films from Exfoliated Aluminosilicate/Coumarin Dye Complexes and Cationic Polyelectrolytes by Layer-by-Layer Deposition

2000 ◽  
Vol 660 ◽  
Author(s):  
Dong Wook Kim ◽  
Alexandre Blumstein ◽  
Jayant Kumar ◽  
Changmo Sung ◽  
Sukant K. Tripathy
Keyword(s):  
Self Assembly ◽  
Cationic Polyelectrolyte ◽  
Nanocomposite Films ◽  
Transmission Electron Microscopy Data ◽  
Layer By Layer ◽  
Dye Molecules ◽  
Transparent Films ◽  
Ion Exchange Reaction ◽  
Coumarin Dye ◽  
Cationic Polyelectrolytes

ABSTRACTMultilayer nanocomposite films have been prepared from exfoliated aluminosilicate/coumarin dye complex through layer-by-layer self-assembly using cationic polyelectrolytes. Coumarin dye molecules were intercalated into the layered aluminosilicate by an ion exchange reaction. Particles of the hectorite/dye complex were delaminated by extensive shaking and sonication of their water suspension into 2∼3 nm-thin silicate layers with molecules of the dye adsorbed on their surface. Atomic force microscopy and transmission electron microscopy data are in agreement with such a model. Ultrathin multilayered films were prepared using layer-by-layer self-assembly from the aluminosilicate platelets and a cationic polyelectrolyte polydiallyldimethylammonium chloride (PDAC). Linear build-up of the films up to 20 cycles was demonstrated and investigated using absorption spectroscopy and spectrofluorometer. The resulting transparent films have exhibited strong characteristic blue-green fluorescence due to coumarin dye molecules adhered to the exfoliated hectorite platelets.

Facile fabrication of flexible Si-based nanocomposite films as high-rate anodes by layer-by-layer self-assembly

2019 ◽  
Vol 476 ◽  
pp. 501-512 ◽  
Author(s):  
Lehao Liu ◽  
Meicheng Li ◽  
Lihua Chu ◽  
Bing Jiang ◽  
Ruoxu Lin
Keyword(s):  
Self Assembly ◽  
High Rate ◽  
Nanocomposite Films ◽  
Layer By Layer ◽  
Facile Fabrication

Preparation of Poly(diallydimethyl ammonium chloride) (PDDA)/Au Nanocomposite Film by In Situ Electrochemical Reduction and its Electrocatalytic Properties

2010 ◽  
Vol 123-125 ◽  
pp. 189-192
Author(s):  
Hong Wei Shi ◽  
Li Zhang ◽  
Cong Wang ◽  
Ke Ying Zhang
Keyword(s):  
Electrochemical Reduction ◽  
Ammonium Chloride ◽  
Photoelectron Spectroscopy ◽  
Self Assembly ◽  
Composite Films ◽  
Nanocomposite Films ◽  
Layer By Layer ◽  
X Ray ◽  
Assembly Technique

Nanocomposite films containing Au nanoparticles were fabricated by alternating adsorption of poly(diallydimethyl ammonium chloride) (PDDA) and HAuCl4 using layer-by-layer self-assembly technique and subsequent in situ electrochemical reduction of the AuCl4- ions. The composition and properties of the composite films were characterized by ultraviolet-visible spectroscopy (UV-vis), X-ray photoelectron spectroscopy (XPS), and cyclic voltammetry (CV).The UV-vis characteristic absorbances of PDDA and Au increase almost linearly with the number of bilayers, which suggests a progressive deposition with almost an equal amount of the PDDA and Au in each cycle. X-ray photoelectron spectroscopy further confirms the presence of the main components (such as PDDA and Au) of the nanocomposite films. Furthermore, the nanocomposite films also exhibit good electrocatalytic activity for the oxidation of ascorbic acid (AA), which may be used in electrochemical biosensors.

Investigations of New Self-Assembled Multilayer Thin Films Based on Alternately Adsorbed Layers of Polyelectrolytes and Functional Dye Molecules

1995 ◽  
Vol 413 ◽  
Author(s):  
Dongsik Yoo ◽  
Jin-kyu Lee ◽  
M. F. Rubner
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Self Assembly ◽  
Fluorescent Dyes ◽  
Multilayer Thin Films ◽  
Layer By Layer ◽  
Dye Molecules ◽  
Ph Indicator ◽  
Light Emitting ◽  
Thin Film Devices

ABSTRACTThe layer-by-layer self-assembly of a number of different functional dye molecules has been accomplished via the alternate spontaneous adsorption of polyelectrolytes and ionic dyes from dilute solutions. Multilayer thin films containing such functional dyes as pH indicator dyes, infrared absorbing dyes, porphyrin dyes and various fluorescent dyes have been successfully fabricated and their electrical and opt, 2al properties examined. Multilayers containing a newly synthesized ionic ruthenium based polypryidyl dye have been utilized to fabricate light emitting thin film devices with high brightness (ca. 100 cd/m2) at voltages in the range of 5–10 volts. These new light emitting thin film devices exhibit excellent stability when compared to devices based on conjugated polymers such PPV. The fabrication and device evaluation of new heterostructure thin films based on this new light emitting dye as well as the properties of other multilayer thin films containing dye molecules are presented.

Electrostatic layer-by-layer self-assembly of anionic squarylium and cationic polyelectrolyte

2006 ◽  
Vol 69 (1-2) ◽  
pp. 108-110 ◽  
Author(s):  
Sung-Hoon Kim ◽  
Chi-Hee Ahn ◽  
So-Yeon Park ◽  
Chang-Ju Shin ◽  
Hee-Jung Suh
Keyword(s):  
Self Assembly ◽  
Cationic Polyelectrolyte ◽  
Layer By Layer

Preparation Mechanism of Electrostatic Self-Assembled Polyelectrolyte Film Using Quartz Crystal Microbalance

2012 ◽  
Vol 499 ◽  
pp. 63-66
Author(s):  
Ning Mei Hao ◽  
Dong Zhi Zhang ◽  
Bo Kai Xia ◽  
Kai Wang ◽  
Chun Yue Wan
Keyword(s):  
Quartz Crystal Microbalance ◽  
Self Assembly ◽  
Quartz Crystal ◽  
Nanocomposite Films ◽  
Layer By Layer ◽  
Level Control ◽  
Sequential Adsorption ◽  
Polyelectrolyte Film ◽  
Oppositely Charged ◽  
Multi Layer Film

Electrostatic layer-by-layer (LbL) self-assembly is widely used in sequential adsorption of nanometer-thick monolayers of oppositely charged polyelectrolytes to form a multi-layer film with molecular-level control over the architecture. To offer functional material for the potential application, this paper exploits PDDA and PSS as polycation and polyanion for LbL self-assembly to fabricate polyelectrolyte nanocomposite films. The preparation and film-growing mechanism is investigated under the influences of multi-factor such as polyelectrolyte concentration, ionic strength, and assembling duration using quartz crystal microbalance (QCM). The research results indicate the formation mechanism of multi-layer PDDA/PSS films and offer fundamental basis for the optimum preparation of polyelectrolyte films.

Poly(Acrylic Acid)-Ferric Hydroxide Photosensitive Self-Assembly Film

2010 ◽  
Vol 663-665 ◽  
pp. 252-255
Author(s):  
Xue Feng Li ◽  
Shao Xian Peng
Keyword(s):  
Acrylic Acid ◽  
Self Assembly ◽  
Ferric Hydroxide ◽  
Surface Friction ◽  
Cationic Polyelectrolyte ◽  
Layer By Layer ◽  
Covalent Bonds ◽  
Force Microscopy ◽  
Assembly Technique ◽  
Poly Acrylic Acid

A stable and high lubricant ultrathin film was fabricated by self-assembled procedure at room temperature. Thickness of the films was regularly increased with the layer-by-layer self-assembly process in which poly (acrylic acid)-ferric hydroxide (PAA-Fe(OH)3) sol as anion polyelectrolyte and photosensitive diazoresin (DR) as cationic polyelectrolyte. And the process which based on electrostatic attraction was verified by UV-vis measurement. Furthermore, the ionic bonds in the films converted to covalent bonds under UV irradiation. Finally, the surface morphology and microtribology of the films were investigated by atomic force microscopy (AFM) and friction force microscopy (FFM). The results indicate that the films are flat and uniform through the self-assembly technique and the surface friction coefficients maintain at a rather low value.

scholarly journals Impact of Layer-by-Layer Self-Assembly Clay-Based Nanocoating on Flame Retardant Properties of Sisal Fiber Cellulose Microcrystals

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Chun Wei ◽  
Sihua Zeng ◽  
Yuyuan Tan ◽  
Wu Wang ◽  
Jian Lv ◽  
...  
Keyword(s):  
Zeta Potential ◽  
Flame Retardant ◽  
Self Assembly ◽  
Cationic Polyelectrolyte ◽  
Sisal Fiber ◽  
Layer By Layer ◽  
Gravimetric Analysis ◽  
Assembly Method ◽  
Flame Retardant Properties ◽  
Xrd Patterns

The renewable cationic polyelectrolyte chitosan (CH) and anionic nanomontmorillonite (MMT) layers were alternately deposited on the surface of sisal fiber cellulose microcrystals (SFCM) via layer-by-layer (LBL) self-assembly method. The structure and properties of the composites were characterized by zeta potential, thermal gravimetric analysis (TGA), X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), Fourier transform infrared spectrometer (FTIR), microcalorimeter (MCC), and so forth. The zeta potential results show that the cellulose microcrystalline surface charge reversed due to the adsorption of CH and MMT nanoplatelets during multilayer deposition. MMT characteristic diffraction peaks appear in XRD patterns of SFCM(CH/MMT)5and SFCM(CH/MMT)10composites. Additionally, FESEM reveals that the SFCM(CH/MMT)10surface is covered with a layer of material containing Si, which has been verified by elemental analysis. TGA results show that the initial decomposition (weight loss of 5%) temperature of SFCM(CH/MMT)5is increased by 4°C compared to that of pure SFCM. On the other hand, carbon residue percentage of SFCM(CH/MMT)10is 25.1%, higher than that of pure SFCM (5.4%) by 19.7%. Eventually, it is testified by MCC measurement that CH/MMT coating can significantly reinforce the flame retardant performance of SFCM.

scholarly journals Fast assembly of bio-inspired nanocomposite films

2008 ◽  
Vol 23 (4) ◽  
pp. 1026-1035 ◽  
Author(s):  
Viatcheslav Vertlib ◽  
Marianne Dietiker ◽  
Michael Plötze ◽  
Lee Yezek ◽  
Ralph Spolenak ◽  
...  
Keyword(s):  
Self Assembly ◽  
Spin Coating ◽  
Coating Layer ◽  
Fold Increase ◽  
Dip Coating ◽  
Nanocomposite Films ◽  
Bilayer Film ◽  
Layer By Layer ◽  
Layer By Layer Assembly ◽  
Layer Assembly

This paper presents a spin-coating layer-by-layer assembly process to prepare multilayered polyelectrolyte-clay nanocomposites. This method allows for the fast production of films with controlled layered structure. The preparation of a 100-bilayer film with a thickness of about 330 nm needs less than 1 h, which is 20 times faster than conventional dip-coating processes maintaining the same hardness and modulus values. For validation of this technique, nanocomposite films with thicknesses up to 0.5 μm have been created with the common dip self-assembly and with the spin coating layer-by-layer assembly technique from a poly(diallyldimethylammonium)chloride (PDDA) solution and a suspension of a smectite clay mineral (Laponite). Geometrical characteristics (thickness, roughness, and texture) as well as mechanical characteristics (hardness and modulus) of the clay-polyelectrolyte films have been studied. The spin-coated nanocomposite films exhibit clearly improved mechanical properties (hardness 0.4 GPa, elastic modulus 7 GPa) compared to the “pure” polymer film, namely a sixfold increase in hardness and a 17-fold increase in Young’s modulus.

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