Self-assembly of copper-free maltoheptaose-block-polystyrene nanostructured thin films in real and reciprocal space

Yingjie Liao; Laurent J Goujon; Eric Reynaud; Sami Halila; Alain Gibaud; Bin Wei; Redouane Borsali

doi:10.1016/j.carbpol.2019.02.014

Self-assembly of copper-free maltoheptaose-block-polystyrene nanostructured thin films in real and reciprocal space

Carbohydr Polym. 2019 May 15:212:222-228. doi: 10.1016/j.carbpol.2019.02.014. Epub 2019 Feb 5.

Authors

Yingjie Liao¹, Laurent J Goujon², Eric Reynaud², Sami Halila², Alain Gibaud³, Bin Wei⁴, Redouane Borsali⁵

Affiliations

¹ Key Laboratory of Advanced Display and System Application, Ministry of Education, Shanghai University, Shanghai 200072, China; Univ. Grenoble Alpes, CNRS, CERMAV, F-38000 Grenoble, France.
² Univ. Grenoble Alpes, CNRS, CERMAV, F-38000 Grenoble, France.
³ LUNAM, Institut des Molécules et Matériaux du Mans (IMMM) UMR CNRS 6283, Le MANS Université, Avenue Olivier Messiaen, 72085 Le Mans Cedex 9, France.
⁴ Key Laboratory of Advanced Display and System Application, Ministry of Education, Shanghai University, Shanghai 200072, China. Electronic address: bwei@shu.edu.cn.
⁵ Univ. Grenoble Alpes, CNRS, CERMAV, F-38000 Grenoble, France. Electronic address: borsali@cermav.cnrs.fr.

PMID: 30832851
DOI: 10.1016/j.carbpol.2019.02.014

Abstract

The promising carbohydrate-based block copolymer maltoheptaose-block-polystyrene (MH-b-PS) has been used for high-performance memory transistors and next generation nanolithography. In order to realize the potential of MH-b-PS especially in microelectronic applications, we firstly improved its synthetic method for obtaining large amount of copper-free MH-b-PS. The main improvement relies on the removal of the residual copper catalyst by using a chelating resin. Then, the microphase separation of copper-free MH-b-PS in both thin film and bulk states under different solvent vapor annealing conditions were investigated comprehensively and compared with our previous report by using both real-space and reciprocal-space techniques. A phase transition of MH-b-PS from hexagonal close-packed horizontal cylinders to face-centered cubic were observed when increasing the amount of tetrahydrofuran in the mixture annealing solvent of tetrahydrofuran and H₂O. More details about self-assembled MH-b-PS nanostructures were analyzed by comparing grazing incidence small angle X-ray scattering patterns with corresponding atomic force microscopy phase images.

Keywords: Carbohydrate-based block copolymers; Copper-catalyzed azide-alkyne cycloaddition; Grazing incidence small angle X-ray scattering; Microphase separation; Solvent vapor annealing.