• Facile method to align crystalline needles composed of organic semiconducting materials using a balance between centrifugal and capillary forces

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      https://www.ias.ac.in/article/fulltext/boms/040/06/1127-1136

    • Keywords

       

      Crystalline needles; centrifugal force; capillary force; organic semiconducting materials; self-assembly.

    • Abstract

       

      Methods to align one-dimensional microstructures composed of organic materials have attracted much attentionbecause of their potential applications to devices such as field-effect transistors. Although dip coating is one of the methods(using self-assembly) used for the purpose, its disadvantage is that a larger amount of the material dissolves in the solutionthan what actually gets deposited on substrate. In this study, we developed a novel method that requires a small amountof precursor solution. By placing a polydimethylsiloxane block on a glass substrate and rotating the substrate using a spincoater, a small amount of the precursor solution was confined in a narrow region along the foot of the block.When we usedan organic semiconducting material, 9,10-dibromoanthracene, as a solute, aligned and roughly oriented crystalline needleswere precipitated. The thicknesses and lengths of the crystalline needles were controlled by the composition of the solventand the rotation speed.

    • Author Affiliations

       

      MASASHI WATANABE1 KOUHEI TANAKA1

      1. Faculty of Textile Science and Technology, Shinshu University, 3-15-1 Tokida, Ueda, Nagano 386-8567, Japan
    • Dates

       
  • Bulletin of Materials Science | News

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