Photocatalytic Nanocomposite Films Fabricated by Layer‐by‐Layer Self‐assembly of TiO 2 Nanoparticles and Lignosulfonates

2012 ◽  
Vol 30 (7) ◽  
pp. 1605-1610 ◽  
Author(s):  
Hui Li ◽  
Shiyu Fu ◽  
Lincai Peng ◽  
Huaiyu Zhan
Keyword(s):  
Self Assembly ◽  
Nanocomposite Films ◽  
Layer By Layer

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.

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.

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.

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.

Fabrication and characterization of Ag/polymer nanocomposite films through layer-by-layer self-assembly technique

2007 ◽  
Vol 515 (20-21) ◽  
pp. 7870-7875 ◽  
Author(s):  
Xiaohong Liu ◽  
Jinqing Wang ◽  
Junyan Zhang ◽  
Bin Liu ◽  
Jinfang Zhou ◽  
...  
Keyword(s):  
Self Assembly ◽  
Polymer Nanocomposite ◽  
Nanocomposite Films ◽  
Layer By Layer ◽  
Assembly Technique ◽  
Fabrication And Characterization

Synthesis and Characterization of Electrostatical Self-Assembly CdSe/Polymer Nanocomposite Films

2002 ◽  
Vol 733 ◽  
Author(s):  
Liangmin Zhang ◽  
Fajian Zhang ◽  
R. O. Claus
Keyword(s):  
Quantum Dots ◽  
Photoelectron Spectroscopy ◽  
Self Assembly ◽  
Polymer Nanocomposite ◽  
Nanocomposite Films ◽  
Cdse Quantum Dots ◽  
Layer By Layer ◽  
Force Microscopy ◽  
Atomic Force ◽  
Transmission Electron

AbstractUsing a novel electrostatic self-assembly (ESA) method to incorporate CdSe quantum dots into polymer we have successfully synthesized ultrathin films. This method allows the molecular-level thickness control and layer-by-layer formation of multilayer thin and thick films using alternative anionic and cationic molecular solution dipping. From ellipsometric measurements, we obtained that the thickness of per bilayer is around 3.7 nm. UV-vis absorption spectra versus the number of bilayers have also been obtained using an Hitachi 2001 spectrometer. The size of CdSe quantum dots has been measured using transmission electron microscopy before the CdSe quantum dots are incorporated and confirmed using atomic force microscopy after the formation of the film, respectively. Both measurements indicate that the diameter of the CdSe quantum dots is 2-3 nm. Xray photoelectron spectroscopy indicates that the concentration of the CdSe quantum dots in the film is 2.14%.

Molecular Self-Assembly of Fe3O4/Polyimide Nanocomposite Films (I)

1997 ◽  
Vol 475 ◽  
Author(s):  
Yanjing Liu ◽  
Anbo Wang ◽  
Richard O. Claus ◽  
Eric Jiang
Keyword(s):  
Aqueous Solution ◽  
Self Assembly ◽  
Single Crystal Silicon ◽  
Magnetic Films ◽  
Nanocomposite Films ◽  
Layer By Layer ◽  
Crystal Silicon ◽  
Vis Spectroscopy ◽  
Polyimide Nanocomposite ◽  
Polyimide Precursor

ABSTRACTLayer-by-layer molecular self-assembly of nanosized magnetite (Fe3O4) particles and polyimide precursor molecules into multilayer ultrathin films has been accomplished on single crystal silicon and quartz substrates. This process involves the alternate dipping of a substrate into an aqueous solution of cationic polymer which coats on nanoscale Fe3O4 particles as a stabilizer followed by dipping into an aqueous solution of anionie polyimide precursor (polyamic acid salt, PAATEA). The growth process and the structure have been characterized using UV-vis spectroscopy, FT-IR, and scanning electron microscopy. The results demonstrate that well-ordered uniform monolayer and multilayer magnetic films have been formed on silicon and silica surfaces.

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