Changes of the lamellar period by nanoparticles in the nanoreactor scheme of thin films of symmetric diblock copolymers

Sohn, B. H.; Seo, Byung-Wook; Yoo, Seong-Il

doi:10.1039/b201752k

Cited by 29 publications

(35 citation statements)

References 22 publications

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“…This solid/fluid duality of polymers allows one to control the mobility of guest nanoparticles embedded in polymeric matrices by simply adjusting the processing temperature or the content of a plasticizer. While some studies have appeared that reported on embedding nanoparticles into block copolymer matrices [18][19][20][21][22], the research is still in its infancy. The mechanism of organization and the degree of order of nanoparticles inside the copolymer phases are not known.…”

Section: Introductionmentioning

confidence: 99%

Controlling the assembly of nanoparticles using surface grafted molecular and macromolecular gradients

et al. 2003

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We report on the generation of assemblies comprising number density gradients of nanoparticles in two (2D) and three (3D) dimensions. These structures are fabricated by creating a surface-bound organic template which directs the spatial arrangement of gold nanoparticles. The 2D template is made of amine-terminated organosilane with a concentration gradient along the solid substrate. The 3D matrix comprises surface-anchored poly(acryl amide), whose molecular weight changes gradually on the specimen. In both cases, the composite is assembled at low pH, where the positively charged-NH + 3 groups within the organic scaffold attract negatively charged gold nanoparticles. We use a battery of experimental tools to determine the number density of particles along the gradient substrate and in the case of 3D structures also their spatial distribution. For 2D gradient assemblies, we show that gold nanoparticle coverage on the surface decreases gradually as the concentration of substrate-bound aminosilane decreases. The number of particles in the polymer brush/particle hybrid is found to increase with increasing polymer molecular weight. We show that for a given grafting density of polymer brush, larger particles predominantly stay near the brush-air interface. In contrast, smaller nanoparticles penetrate deeper into the polymer brush, thus forming a 3D structure. Finally, we discuss possible applications of these nanoparticle gradient assemblies.

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Section: Introductionmentioning

confidence: 99%

Controlling the assembly of nanoparticles using surface grafted molecular and macromolecular gradients

et al. 2003

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“…There are numerous examples of selective decoration, whereby one of the microphase separated polymer blocks selectively binds nanoparticles, [70][71][72][73][74][75][76][77][78][79] which usually results in wire-like arrays of metallic nanoparticles. [70][71][72][73][74][75] Continuous wires have recently been obtained by Chai et al who selectively incorporated metal ions in the cylindrical P4VP blocks of a PS-b-P4VP block copolymer thin film, which after removal of the polymer by plasma treatment resulted in metallic nanowires (Fig.…”

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confidence: 99%

Thin films of complexed block copolymers

2009

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Due to their ability to microphase separate into well ordered structures with periodicities on the nanometre scale, block copolymers have received widespread attention as building blocks for the fabrication of nanomaterials. In particular, thin films of block copolymers promise new technological breakthroughs in e.g. computer memory applications. This Review gives a short overview of progress that has been made in preparing suitable thin films of conventional coil-coil diblock copolymer systems, while the advantages as well as the complexities of using more unconventional systems such as triblock copolymers and supramolecular systems are emphasized. Gerrit tenBrinke obtained his PhD in Statistical Physics from the University of Groningen, The Netherlands. He spent two years as a postdoctoral fellow at the University of Massachusetts at Amherst. In 1985 he became Associate Professor in the Polymer Department of the University of Groningen and in 1996 Professor. During 1994-1999 he was also part time Professor at the Helsinki University of Technology working closely together with Olli Ikkala. His research interests are self-assembly in complex polymer systems.

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“…The glass transition temperatures of the PS and P4VP blocks were 102 and 138 8C, respectively. [26] Dodecylbenzenesulfonic acid (DBSA) (96%) was provided by Alfa Aesar Co., and 3-pentadecylphenol (PDP) (90-95%) was acquired from Acros Organics Co. Chloroform (A.R. grade) was supplied by Beijing Chemical Reagent Co.…”

Section: Methodsmentioning

confidence: 99%

Surface Morphology Evolution of a Thin Polymeric Supramolecular Film by Tuning Interactions

Zhang

Gao

et al. 2006

Macromol. Rapid Commun.

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Summary: A polymeric supramolecule consisting of symmetric polystyrene‐block‐poly(4‐vinylpyridine) (PS‐b‐P4VP), dodecylbenzenesulfonic acid (DBSA), and 3‐pentadecylphenol (PDP) was formed by proton transfer and hydrogen bonding. The surface morphology of a thin film of the polymeric supramolecule has been investigated. The spherical PS microdomains embedded in a P4VP(DBSA)1.0(PDP)1.0 matrix are observed for the as‐cast film because the weight fraction, fcomb, of the P4VP(DBSA)1.0(PDP)1.0 blocks is much higher than that of PS as a result of the non‐covalent interactions of P4VP and DBSA and DBSA and PDP. Upon annealing the PS‐b‐P4VP(1:1)(DBSA)1.0(PDP)1.0 film at high temperatures, the hydrogen bonding between the DBSA and PDP diminishes, which leads to a change of overall morphology from an ordered sphere to a pitted structure.AFM topographic image of a PS‐b‐P4VP(1:1)(DBSA)1.0(PDP)1.0 thin film.magnified imageAFM topographic image of a PS‐b‐P4VP(1:1)(DBSA)1.0(PDP)1.0 thin film.

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Changes of the lamellar period by nanoparticles in the nanoreactor scheme of thin films of symmetric diblock copolymers

Cited by 29 publications

References 22 publications

Controlling the assembly of nanoparticles using surface grafted molecular and macromolecular gradients

Controlling the assembly of nanoparticles using surface grafted molecular and macromolecular gradients

Thin films of complexed block copolymers

Surface Morphology Evolution of a Thin Polymeric Supramolecular Film by Tuning Interactions

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