Directed self-assembly of gradient concentric carbon nanotube rings

Suck Won Hong, Wonje Jeong, Hyunhyub Ko, Michael R. Kessler, Vladimir V. Tsukruk, Zhiqun Lin

Research output: Contribution to journalArticlepeer-review

78 Scopus citations


Hundreds of gradient concentric rings of linear conjugated polymer, (poly[2-methoxy-5-(2-ethylhexyloxy)-1,4- phenylenevinylene], i.e., MEH-PPV) with remarkable regularity over large areas were produced by controlled "stick-slip" motions of the contact line in a confined geometry consisting of a sphere on a flat substrate (i.e., sphere-on-flat geometry). Subsequently, MEH-PPV rings were exploited as a template to direct the formation of gradient concentric rings of multiwalled carbon nanotubes (MWNTs) with controlled density. This method is simple, cost effective, and robust, combining two consecutive self-assembly processes, namely, evaporation-induced self-assembly of polymers in a sphere-on-flat geometry, followed by subsequent directed self-assembly of MWNTs on the polymer-templated surfaces.

Original languageEnglish
Pages (from-to)2114-2122
Number of pages9
JournalAdvanced Functional Materials
Issue number14
StatePublished - 23 Jul 2008


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