Studies on the electrostatic self‐assembly of polyelectrolytes and organic dyes with atomic force microscopy

Zhong, Aihua; Lin, Xiaohui; Chen, Deben; Zhou, Zhiping

doi:10.1002/app.11439

Cited by 5 publications

(5 citation statements)

References 14 publications

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“…The synthetic scheme of preparation of the LiQcontaining polymer V(CPA 1 -HQ-Li and CPA 2 -HQ-Li) is shown in Scheme 1. The dropping sequence of the reactants, pH of the mixture solution (8)(9)(10)(11) and the dry atmosphere were very important. A classical lithium complex was formed with the possible structure LiQ Á 3H 2 O.…”

Section: Synthesis and Esamentioning

confidence: 99%

“…It provides a way to control the construction of ultrathin films (e.g., thickness and composition) at nanoscale, and a long‐term stability of the film can be obtained easily. Besides, this technique could be applied to many systems, not only polyelectrolytes, but also inorganic nanoparticles,10 dyes,11, 12 and biological macromolecules such as DNA13 and proteins 14. ESA technique have already become a advanced and pop subject in chemistry research field 15–17…”

Section: Introductionmentioning

confidence: 99%

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Preparation and characterization of lithium‐8‐hydroxyquinolate‐containing quaternary ammonium copolymers and their electrostatic layer‐by‐layer self‐assembly

Zhang

Wang

Jiang

et al. 2008

J of Applied Polymer Sci

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ABSTRACT:The lithium-8-hydroxyquinolate functionalized polycation copolymers with quaternary ammonium-type linkage have been prepared by reaction of 5-chloromethyl-8-quinolinol hydrochloride (CHQ) with the copolymer (CPA) of methacrylic ester and 2-(dimethylamino)ethyl methacrylate (DM), followed by metalation with lithium. Two kinds of copolymers with each containing 9.69 and 16.29 wt % of the DM content (CPA 1 and CPA 2 ) were involved in the study. The structures of these polymers were characterized by Fourier transform infrared techniques and gel permeation chromatography. The multilayer films were prepared by alternate electrostatic layerby-layer self-assembly (ESA) of CPA with polyanion electrolyte. The UV-vis and fluorescence spectra of the films showed a red shift compared to those in tetrahydrofuran solutions. The intensity in UV-vis increased and that of fluorescence decreased linearly with the number of film layers. Atom force microscope (AFM) results of the multilayer films demonstrated presence of compact films on the surface after chelating metal ions. The experimental results indicated that these kinds of materials have applied potential in organic light-emitting diodes (OLEDs).

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Section: Synthesis and Esamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of lithium‐8‐hydroxyquinolate‐containing quaternary ammonium copolymers and their electrostatic layer‐by‐layer self‐assembly

Zhang

Wang

Jiang

et al. 2008

J of Applied Polymer Sci

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“…The authors' group made luminescence ultrathin films using polymers with organic dyes and luminescence material via self-assembly. [21][22][23] The cationic polyacrylamide (CPAM) is a good water soluble cationic polyelectrolyte and easy to prepare. It can be combined with negatively charged materials, owing to positive charges on molecular chains.…”

Section: Introductionmentioning

confidence: 99%

Assembly and composite of CdTe nanocrystals and cationic copolymers

Yang

Wang

Chen

et al. 2011

Plastics, Rubber and Composites

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CdTe nanocrystals have been synthesised with thioglycolic acid as a stabiliser in the aqueous phase. The fluorescence multilayer films of CdTe nanocrystals and cationic copolymers were prepared by layer by layer electrostatic self-assembly. The multilayer films were characterised using fluorescence spectra, X-ray photoelectron spectroscopy and atomic force microscopy. The fluorescence intensity of multilayer films was enhanced with the increase in the content of 2trimethylammonium ethyl methacrylate chloride in the cationic copolymers. At the same time, a red shift of the corresponding fluorescence emission peak of the multilayer films was suggestive of the increment of the electrostatic force. The surface morphology of the CdTe/cationic polyacrylamide multilayer films was observed by atomic force microscopy. X-ray photoelectron spectroscopy provided evidence for the presence of CdTe nanocrystals in the multilayer films. A laser diffraction grain size analyser revealed that the size of CdTe nanocrystals increased with the addition of cationic copolymers.

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“…The observation that substrates modified with dye polymer films show excellent catalytic and photoelectrochemical properties has stimulated much recent activity in characterizing sensitized redox reactions in nonhomogenous media. Therefore, new strategies have aimed at tailoring only the surface of materials or a thin‐surface layer while preserving the bulk properties of the underlying support 10. Electropolymerization is one of the most important techniques for obtaining oligomer and polymer thin films.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical preparation of pyronin Y thin films on gold substrates

Alanyalıoğlu

Arık

2008

J of Applied Polymer Sci

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Cyclic voltammetry, chronoamperometry, UV-vis absorption spectroscopy, fluorescence spectroscopy, FTIR spectroscopy, and AFM techniques have been employed to investigate pyronin Y thin films formed on Au(111) substrates by electrochemical oxidation of pyronin Y monomer. The medium used in the electropolymerization was an anhydrous acetonitrile solution containing 0.1M TBAClO 4 as supporting electrolyte. Anodic electropolymerization potential (1450 mV) of pyronin Y has been obtained from cyclic voltammetry data. Solid-state electropolymerization of pyronin Y was performed by the potential-controlled electrolysis technique. Chronoamperometry studies indicate that the adsorption of pyronin Y takes place in an instantaneous three-dimen-sional nucleation and growth mechanism which is accompanied by random adsorption. UV-vis absorption and fluorescence spectra of the electrolysis solution as a function of electrodeposition time show the adsorption of insoluble pyronin Y films on Au electrode surface. FTIRspecular reflectance of a polymer coated Au electrode reveals that there is a possible CAC coupling in the formation of polymeric pyronin Y structure. A well ordered polymeric chain structure of pyronin Y on Au(111) has been observed from AFM data.

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Studies on the electrostatic self‐assembly of polyelectrolytes and organic dyes with atomic force microscopy

Cited by 5 publications

References 14 publications

Preparation and characterization of lithium‐8‐hydroxyquinolate‐containing quaternary ammonium copolymers and their electrostatic layer‐by‐layer self‐assembly

Preparation and characterization of lithium‐8‐hydroxyquinolate‐containing quaternary ammonium copolymers and their electrostatic layer‐by‐layer self‐assembly

Assembly and composite of CdTe nanocrystals and cationic copolymers

Electrochemical preparation of pyronin Y thin films on gold substrates

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