Surface Nanostructuring through block copolymer self-assembly

Jürgen Brugger, Harry Heinzelmann, Sivashankar Krishnamoorthy, Raphaël Pugin
2005
Discussion par affiche

Résumé

Synthesis of nanostructures using polymer self-assembly methods have gained widespread attention due to the multitude of possibilities they offer and their simple and cost-effective approaches. Self-assembly of block copolymers has been recognized as a promising means of creating functional nanostructures in both bulk and on surfaces. The nanostructures formed by block copolymers have been useful for their chemistries, morphology and dimensions. Block copolymers form micelles when dissolved in selective solvents. Several morphologies have been reported for micelles like spherical, cylindrical, and worm-like. Spherical micelles form an ordered array on surface under appropriate conditions of preparation and coating. Their orderly arrangement along with their dimensions offers a simple way of achieving high density nanoscale patterned surfaces. This presentation will highlight our recent work on the use of block copolymer micellar self-assembly as a novel platform to create functional interfaces. The development of a tool box consisting of micellar arrays with tunable micelle dimensions and array periodicities on surface and the application of micellar arrays for both its topography and chemistry will be discussed.

Official source

https://infoscience.epfl.ch/record/100104?ln=fr

À propos de ce résultat

Cette page est générée automatiquement et peut contenir des informations qui ne sont pas correctes, complètes, à jour ou pertinentes par rapport à votre recherche. Il en va de même pour toutes les autres pages de ce site. Veillez à vérifier les informations auprès des sources officielles de l'EPFL.

Concepts associés

Chargement

Publications associées

Chargement

Self-assembly of tunable, responsive polymer nanostructures

Sivashankar Krishnamoorthy

The thesis presents a tool-box based on two dimensional self-assembly of diblock copolymer micelles to achieve nanostructures on surface with control over dimensions, spacing, surface-coverage and surface placement. Polystyrene-block-poly(2-vinyl pyridine), polystyrene-block-polyacrylic acid and polystyrene-block-polyferrocenyldimethylsilane have been used for the study. The utility of the self-assembly approach has been demonstrated by deriving other functional nanostructures like inorganic nanoparticle arrays and nanoscale pillars and holes on hard and soft substrates. In this respect, nanoparticle arrays of iron oxide with systematically tunable dimensions in the sub-10nm regime, creating sub-50nm wide Si, Si3N4, SiO2 and Quartz pillars and holes with varying aspect ratios and PDMS pillars/holes are presented. Preliminary results applying the nanostructured surfaces for applications such as carbon nanotube growth, controlling human stem-cell adhesion and expression, controlling columnar growth of physical vapor deposited TiN pyramids, and super-hydrophobic surfaces has been presented and discussed. The many interesting directions for future work based on the thesis results are presented in the outlook and where appropriate.

EPFL2006

Chargement

, , ,

Nanostructures are known to exhibit novel optical, electrical, and magnetic and many other interesting physical properties and a lot of research has been invested on the synthesis and study of such structures in the recent years. The massive drive towards miniaturization of devices heavily relies on the successful functioning of nanostructures. Self-assembly (or the bottom-up approaches) is emerging as an attractive tool for creating functional nanostructures owing to its simplicity and relatively low cost approaches. Nanostructures with high density and periodicity on surface are important in applications like high density data storage, sensors, catalyst support surfaces and other functional interfaces. Reverse micelles formed by the self-organization of amphiphilic diblock copolymer molecules have been used to create an array of polymer nanoparticles on silicon surface by spin coating . The formation of reverse micelles, the means of tuning their sizes and systematically varying the periodicities using solvent quality, solution concentration, deposition conditions and polymer molecular weight as handles will be presented. The hydrophilic core of the reverse micelles is capable of binding metal ions and so, inorganic nanoparticle arrays can be derived from these micelle arrays. The size of the nanoparticles in the array is further tunable by working on the loading conditions. The tunability of nanoparticle sizes will be presented as well.

2005

Chargement