Vapor Sorption in Self-Assembled Gold Nanoparticle/Dendrimer Films Studied by Specular Neutron Reflectometry

Krasteva, Nadejda; Krustev, R.; Yasuda, A.; Voßmeyer, Tobias

doi:10.1021/la0267488

Cited by 45 publications

(52 citation statements)

References 26 publications

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“…[43] In addition, measurements on vapordosed Au-nanoparticle-dendrimer composites carried out by specular neutron reflectometry showed that the thickness increase of films dosed with saturated solvent vapors is up to about 10 % of the initial film thickness. [21,44] The results presented here are also in agreement with a study on vapor sorption in carbon-black-polymer-nanocomposite films, [45] which showed that for little film swelling (up to 3 %) both the resistance and thickness changes depended linearly on the amount of sorbed analyte.…”

Section: N Krasteva Et Al/vapor Sorption Of Au Nanoparticle Compositessupporting

confidence: 90%

Vapor Sorption and Electrical Response of Au‐Nanoparticle– Dendrimer Composites

Krasteva¹,

Fogel

Bauer

et al. 2007

Adv Funct Materials

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Films comprising Au nanoparticles and polyphenylene dendrimers (first and second generation) are deposited onto transducer substrates via layer‐by‐layer self‐assembly and characterized by atomic force microscopy and X‐ray photoelectron spectroscopy. Their sorption behavior is studied by measuring the uptake of solvents from the vapor phase with quartz crystal microbalances (QCMs). The resistance of the films is simultaneously monitored. Both sensor types, QCMs and chemiresistors, give qualitatively very similar response isotherms that are consistent with a combination of Henry‐ and Langmuir‐type sorption processes. The sorption‐induced increase in relative differential resistance scales linearly with the amount of analyte accumulated in the films. This result is in general agreement with an activated tunneling process for charge transport, if little swelling and only small changes in the permittivity of the film occur during analyte sorption (a first‐order approximation). The relative sensitivity of the films to different solvents decreases in the order toluene ≈ tetrachloroethylene > 1‐propanol ≫ water. Films containing the larger second‐generation dendrimers show higher sensitivity than films containing first‐generation dendrimers.

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Section: N Krasteva Et Al/vapor Sorption Of Au Nanoparticle Compositessupporting

confidence: 90%

Vapor Sorption and Electrical Response of Au‐Nanoparticle– Dendrimer Composites

Krasteva¹,

Fogel

Bauer

et al. 2007

Adv Funct Materials

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“…[1] The good dispersion of metallic NPs within a polymeric matrix is a tough goal of increasing importance since these hybrid materials could have high potentiality for applications in many fields such as catalysis, [2] electron or energy storage [3] and sensors. [4] In particular, silver NPs are very important for their excellent electrical conductivity, [5] antimicrobial effect [6] and optical properties. [7] The main challenge in this area is to overcome NPs agglomeration; because of their high surface area, metal NPs have a strong tendency to agglomerate.…”

Section: Introductionmentioning

confidence: 99%

In‐situ‐Synthetized Silver/Epoxy Nanocomposites: Electrical Characterization by Means of Dielectric Spectroscopy

Vescovo

Sangermano

Scarazzini

et al. 2010

Macro Chemistry & Physics

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In situ synthesis of silver/epoxy nanocomposites was achieved by UV‐induced polymerization through a simultaneous photoinduced electron transfer and cationic polymerization processes. The FESEM morphological investigation showed a uniform dispersion of silver nanoparticles within the polymeric matrix having narrow size distribution between 15 and 20 nm. The evolution of dielectric properties with frequency and NP content seem to indicate that the nanocomposites of this study remain below the percolation threshold. The dielectric spectroscopy results are in good agreement with the morphological investigation, which showed the absence of NPs percolative network.

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“…35 Self-assembly of nanoparticle multilayer films was based on an interaction between carboxylic acid (COOH)-functionalized nanoparticles and linkers. [35][36][37][38][39] Previously, the linkers such as metal cations, ionic polymers, and dendrimers were used for the preparation of various nanoparticle hybrid multilayer films.…”

Section: Resultsmentioning

confidence: 99%

Preparation of Gold Nanoisland Arrays from Layer-by-Layer Assembled Nanoparticle Multilayer Films

Choi¹,

Guerrero²,

Aquino³

et al. 2010

Bulletin of the Korean Chemical Society

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This article introduces a facile nanoparticle self-assembly/annealing method for the preparation of nanoisland films. First, nanoparticle-polymer multilayer films are prepared with layer-by-layer assembly. Nanoparticle multilayer films are then annealed at ~ 500 o C in air to evaporate organic matters from the films. During the annealing process, the nanoparticles on the solid surface undergo nucleation and coalescence, resulting in the formation of nanostructured gold island arrays. By controlling the overall thickness (number of layers) of nanoparticle multilayer films, nanoisland films with various island density and different average sizes are obtained. The surface property of gold nanoisland films is further controlled by the self-assembly of alkanethiols, which results in an increased surface hydrophobicity of the films. The structure and characteristics of these nanoisland film arrays are found to be quite comparable to those of nanoisland films prepared by vacuum evaporation method. However, this self-assembly/annealing protocol is simple and requires only common laboratory supplies and equipment for the entire preparation process.

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Vapor Sorption in Self-Assembled Gold Nanoparticle/Dendrimer Films Studied by Specular Neutron Reflectometry

Cited by 45 publications

References 26 publications

Vapor Sorption and Electrical Response of Au‐Nanoparticle– Dendrimer Composites

Vapor Sorption and Electrical Response of Au‐Nanoparticle– Dendrimer Composites

In‐situ‐Synthetized Silver/Epoxy Nanocomposites: Electrical Characterization by Means of Dielectric Spectroscopy

Preparation of Gold Nanoisland Arrays from Layer-by-Layer Assembled Nanoparticle Multilayer Films

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