|
Authors
|
Nandan, B. ; Gowd, E. B. ; Bigall, N. C. ; Eychmüller, A. ; Stamm, M.
|
|
Title
|
Supramolecular assemblies of block copolymers as Templates for nanofabrication
|
|
Date
|
27.01.2010
|
|
Number
|
22683
|
|
Abstract
|
Highly ordered arrays of nanostructures derived from block copolymer self-assembly have attracted a lot of attention for nanotechnological applications, such as in nanostructured networks and membranes, nanoparticle templates and nanoreactors, photonic crystals, and high density information storage media. In the present work, we investigated nanotemplates based on supramolecular assembly (SMA) of polystyrene-block-poly(4-vinylpyridine) (PS-b-P4VP) and a low molar mass additive 2-(4'-hydroxyphenylazo)benzoic acid (HABA). The strong repulsion between PS and P4VP in this system allowed fabrication of templates with regular structures of sub-30 nm periodicity. Self-assembled polymeric templates of such characteristic length-scale were not accessible in the past with other block copolymers. Moreover, the hexagonally packed P4VP(HABA) cylinders in thin films of these SMAs orient perpendicular to substrate when exposed to vapors of 1,4-dioxane, however, switches to parallel orientation in chloroform vapors. Selective extraction of HABA from the SMA created empty pores whose walls were lined with P4VP chains. Inorganic nanoparticles were found to enter selectively into the pores when the template was incubated in an aqueous solution of these nanoparticles. The polymer template was then removed by pyrolytic degradation or oxygen plasma etching leaving one or two dimensionally arranged nanoparticle arrays whose large scale morphology mirrored that of the SMA.
|
|
Publisher
|
Polymeric Materials: Science and Engineering
|
|
Wikidata
|
|
|
Citation
|
Polymeric Materials: Science and Engineering 100 (2010) 402-403
|
|
DOI
|
http://oasys2.confex.com/acs/237nm/techprogram/P1248691.HTM
|
|
Tags
|
|
