Fabrication and Characterization of the Multilayer Film Containing Polyoxometalate with Pendant Support-Ligand

2007 ◽  
Vol 336-338 ◽  
pp. 2235-2237
Author(s):  
Hui Yuan Ma ◽  
Jun Peng ◽  
Fu Ping Wang ◽  
Bao Xia Dong
Keyword(s):  
Cyclic Voltammetry ◽  
Electrochemical Property ◽  
Self Assembly ◽  
Multilayer Film ◽  
Interface Roughness ◽  
The Self ◽  
Layer By Layer ◽  
The Mean ◽  
Fabrication And Characterization

A novel nanosized multilayer film containing polyoxometalate anion with a pendant supportligand α-[SiW11O39Co(H3P2O7)]7- (abbr. SiW11Co-P2O7) and poly(diallyldimethyl ammonium chloride (PDDA) was fabricated by layer-by-layer self-assembly. The multilayer film was characterized by XPS, UV-vis, AFM and ESR. The mean interface roughness was about 2.0 nm, calculated from an area of 0.5 × 0.5 μm2. The electrochemical property was studied by the cyclic voltammetry, the results indicating that the self-assembly film exhibited favorable electrochemical behavior of polyoxometalate.

Fabrication and Characterization of LuminescentMultilayer Films Based on Polyoxometalates and Fuchsin Basic

2011 ◽  
Vol 66 (1) ◽  
pp. 43-48
Author(s):  
Changyun Chen ◽  
Jun Peng ◽  
Yan Shen ◽  
Dan Chen ◽  
Huanqiu Zhang ◽  
...  
Keyword(s):  
Self Assembly ◽  
Multilayer Film ◽  
Photoelectron Spectra ◽  
Layer By Layer ◽  
X Ray ◽  
Force Microscopy ◽  
Assembly Method ◽  
Atomic Force ◽  
Fabrication And Characterization

A luminescent multilayer film has been fabricated from the polyoxometalate anion α- [PMo12O40]3− (α-PMo12) and the cation Fuchsin Basic (FB) through an electrostatic layer-by-layer (LbL) self-assembly method and characterized by UV/Vis spectra, atomic force microscopy and X-ray photoelectron spectra. The fluorescence properties of the LbL film have also been investigated. Cyclic voltammetry measurements have demonstrated that the electrochemical properties of the polyoxometalate and FB are maintained in the multilayer film, which exhibits electrocatalytic activity for the reduction of bromate

Dumbbell-shaped dendrimers — Synthesis and self-assembly

2008 ◽  
Vol 86 (6) ◽  
pp. 540-547 ◽  
Author(s):  
Tatiana Vassilieff ◽  
Ashok Kakkar
Keyword(s):  
Self Assembly ◽  
The Self ◽  
Layer By Layer ◽  
Acid Base ◽  
Detailed Characterization ◽  
Generation Number ◽  
Backbone Structure

We report on the synthesis and detailed characterization of dendrimers that evolve symmetrically from a linear core of 2-butyne-1,4-diol with 3,5-dihydroxybenzyl alcohol based dendron arms. The divergent layer-by-layer build-up of the dumbbell-shaped dendrimers is based on simple acid–base hydrolytic chemistry of bis(dimethylamino)dimethylsilane with OH-terminated molecules. The self-assembly of these dendrimers in THF and water is significantly influenced by their generation number, the backbone structure, and the solvent.Key words: dendrimers, divergent synthesis, macromolecules, self-assembly

Characterization Of SnO2 Nanoparticles Deposited Via Layer-by-Layer Self Assembly And Investigation Of Their Sensing Properties

2002 ◽  
Vol 739 ◽  
Author(s):  
R. C. Ghan ◽  
Y. Lvov ◽  
R. S. Besser
Keyword(s):  
Self Assembly ◽  
High Selectivity ◽  
Sno2 Nanoparticles ◽  
Test Chamber ◽  
The Self ◽  
Layer By Layer ◽  
Product Analysis ◽  
Glass Substrates ◽  
Self Assembled

ABSTRACTA technique of Layer-by-Layer (LbL) self-assembly is used to deposit SnO2 nanoparticles on Quartz Crystal Microbalance (QCM) resonators, and on glass substrates which the authors believe has not been previously reported. Characterization of self-assembled SnO2 layers has been performed using QCM, Scanning Electron Microscopy (SEM), and Zeta Potential analysis.We have successfully deposited SnO2 nanoparticles on QCM resonator using self-assembly technique. LbL self-assembly is a method of organization of ultra-thin films by interlayer electrostatic attraction. The thickness and mass of the self-assembled layers can be characterized by the frequency shift obtained using the QCM and empirical equations relating change in frequency with mass and thickness of deposited layers. The deposition of SnO2 nanolayers exhibited a linear reproducibility and the process of self-assembly was independent of the residence time of QCM resonator in the SnO2 nanoparticle colloidal solution. High resolution SEM analysis reveals that the SnO2 nanoparticle layers are uniformly deposited across the entire substrate. Electrical characterization was performed on SnO2 nanoparticle layers self-assembled on glass substrates which were patterned for two point (current-voltage) IV characteristic measurements. Two classes of samples were used. One sample was self-assembled glass substrate patterned with electrical contacts and calcined (baked at 350°C for one hour) to eliminate interlayered polyions and the other sample was not calcined. Results revealed that the calcined samples demonstrated linear ohmic behavior but the uncalcined showed some spurious points which we believe are due to the polyion layers.Characterization of the self-assembled SnO2 nanoparticles is being carried out with the intention of fabricating a high-selectivity μ-gas sensor. A test chamber has been fabricated and results of resistance behavior of the sensor with variation in temperature have been presented.The sensor can find applications in high selectivity sensing of chemical, industrial, domestic, and hazardous environments. After further research and development, this μ-gas sensors could be made generic to sense a variety of gases and employed for integrated on-chip product analysis in multiple chemical microsystem applications.

FABRICATION AND CHARACTERIZATION OF SPIN SELF-ASSEMBLED PPV/MONTMORILLONITE MULTILAYER THIN FILMS

2004 ◽  
Vol 13 (03n04) ◽  
pp. 581-586
Author(s):  
TAE-HO KIM ◽  
O OK PARK
Keyword(s):  
Thin Films ◽  
Self Assembly ◽  
Environmental Stability ◽  
Phenylene Vinylene ◽  
Multilayer Thin Films ◽  
Layer By Layer ◽  
Assembly Method ◽  
Fabrication And Characterization ◽  
Self Assembled

Multilayer nanostructural thin films through a layer-by-layer spin self-assembly method were prepared using poly(p-phenylene vinylene)/montmorillonite. Sodium montmorillonite particles exfoliated into single sheets and cationic PPV precursor and such anionic MMT plates were spin self-assembled by electrostatic attraction. Self-assembled MMT layers blocked the penetration of oxygen and moisture and they reduced the photo-oxidation of the emitting material. Spin self-assembled films showed higher environmental stability and luminescence, and their PL spectra were somewhat different from that of bulk PPV films.

Ultrathin Ruthenium(II) Complex–H4SiW12O40 Multilayer Film

2008 ◽  
Vol 8 (3) ◽  
pp. 1248-1253 ◽  
Author(s):  
Yu-Qi Zhang ◽  
Li-Hua Gao ◽  
Ke-Zhi Wang ◽  
Hong-Jun Gao ◽  
Ye-Liang Wang
Keyword(s):  
Atomic Force Microscopy ◽  
Cyclic Voltammetry ◽  
Photoelectron Spectroscopy ◽  
Self Assembly ◽  
Multilayer Film ◽  
Multilayer Films ◽  
Layer By Layer ◽  
X Ray ◽  
Force Microscopy ◽  
Atomic Force

A dipolar Ru(II) complex, [(bpy)2Ru(bpbh)Ru(bpy)2](ClO4)4 {where bpbh = 1,6-bis-[2-(2-pyridyl) benzimidazoyl]hexane, bpy = 2,2′-bipyridine}, was synthesized and characterized. A multilayer film of at least 18 layers was successfully prepared by alternating adsorption of H4SiW12O40 and [Ru2(bpy)4(bpbh)](ClO4)4 by electrostatic layer-by-layer self-assembly. The multilayer films were studied by ultraviolet-visible and X-ray photoelectron spectroscopy, atomic force microscopy, and cyclic voltammetry.

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

Estimating the shape and size of supramolecular assemblies by variable temperature diffusion ordered spectroscopy

2014 ◽  
Vol 12 (40) ◽  
pp. 7932-7936 ◽  
Author(s):  
Benjamin M. Schulze ◽  
Davita L. Watkins ◽  
Jing Zhang ◽  
Ion Ghiviriga ◽  
Ronald K. Castellano
Keyword(s):  
Self Assembly ◽  
Variable Temperature ◽  
Supramolecular Assemblies ◽  
The Self ◽  
Conjugated Oligomers ◽  
Photovoltaic Devices ◽  
Temperature Diffusion ◽  
Shape And Size

Reported is characterization of the self-assembly of π-conjugated oligomers, molecules studied recently in photovoltaic devices, using variable temperature diffusion ordered spectroscopy; the approach has allowed estimation of assembly size, shape, and molecularity.

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