From dots to doughnuts: Two-dimensionally confined deposition of polyelectrolytes on block copolymer templates

POLYMER

卷:107

Article

Oded, Meirav^1,2  Kelly, Stephen T.^3,5  Gilles, Mary K.³  Mueller, Axel H. E.⁴  Shenhar, Roy^1,2 

[1] Hebrew Univ Jerusalem, Inst Chem, IL-9190401 Jerusalem, Israel

[2] Hebrew Univ Jerusalem, Ctr Nanosci & Nanotechnol, IL-9190401 Jerusalem, Israel

[3] Lawrence Berkeley Natl Lab, Div Chem Sci, Berkeley, CA 94720 USA

[4] Johannes Gutenberg Univ Mainz, Inst Organ Chem, D-55099 Mainz, Germany

[5] Carl Zeiss Xray Microscopy Inc, Pleasanton, CA 94588 USA

关键词: Block copolymers;    Layer-by-layer deposition;    Patterning;    Polyelectrolytes;    Self-assembly;   

DOI  :  10.1016/j.polymer.2016.07.016

来源: Elsevier

【 摘 要 】

The combination of block copolymer templating with electrostatic self-assembly provides a simple and robust method for creating nano-patterned polyelectrolyte multilayers over large areas. The deposition of the first polyelectrolyte layer provides important insights on the initial stages of multilayer buildup. Here, we focus on two-dimensionally confined dots patterns afforded by block copolymer films featuring hexagonally-packed cylinders that are oriented normal to the substrate. Rendering the cylinder caps positively charged enables the selective deposition of negatively charged polyelectrolytes on them under salt-free conditions. The initially formed polyelectrolyte nanostructures adopt a toroidal (doughnut) shape, which results from retraction of dangling polyelectrolyte segments into the dots upon drying. With increasing exposure time to the polyelectrolyte solution, the final shape of the deposited polyelectrolyte transitions from a doughnut to a hemisphere. These insights would enable the creation of patterned polyelectrolyte multilayers with increased control over adsorption selectivity of the additional incoming polyelectrolytes. (C) 2016 Elsevier Ltd. All rights reserved.

【 授权许可】

Free