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Directed self-assembly (DSA) is a type of directed assembly which utilizes block co-polymer morphology to create lines, space and hole patterns, facilitating for a more accurate control of the feature shapes. Then it uses surface interactions as well as polymer thermodynamics to finalize the formation of the final pattern shapes. [1]
Jimmy W. Mays is an American polymer scientist, academic, and author.He is a Professor Emeritus at the University of Tennessee. [1]Mays is most known for his works on polymer chemistry, block copolymers, and composite materials.
Much progress had been reported on the use of PMMA-PS block copolymers to define sub-20 nm patterns by means of self-assembly, guided by surface topography (graphoepitaxy) and/or surface chemical patterning (chemoepitaxy). [71] The key benefit is the relatively simple processing, compared to multiple exposures or multiple depositions and etching.
These kinetic effects, such as trapping in metastable states, slow coarsening kinetics, and pathway-dependent assembly, are often viewed as complications to be overcome in, for example, the formation of block copolymers. [12] [18] Amphiphile self-assembly is an essential bottom-up approach of fabricating advanced functional materials.
This method uses the well-studied methods of producing block copolymers with well-defined geometries and compositions across a large variety of substrates. [3] [34] Synthesis of Janus particles by self-assembly via block copolymers was first described in 2001 by Erhardt et al.
block copolymer: A copolymer that is a block polymer. In the constituent macromolecules of a block copolymer , adjacent blocks are constitutionally different, i.e. adjacent blocks comprise constitutional unit derived from different species of monomer or from the same species of monomer but with a different composition or sequence distribution ...
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Self-assembly is a process which is easily influenced by external parameters. This feature can make synthesis rather complex because of the need to control many free parameters. Yet self-assembly has the advantage that a large variety of shapes and functions on many length scales can be obtained. [31]