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Nanoscale templating and self-assemb...

Hulvat, James Francis.

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Nanoscale templating and self-assembly of organic semiconductors.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Nanoscale templating and self-assembly of organic semiconductors./
作者:	Hulvat, James Francis.
面頁冊數:	267 p.
附註:	Source: Dissertation Abstracts International, Volume: 65-05, Section: B, page: 2576.
Contained By:	Dissertation Abstracts International65-05B.
標題:	Engineering, Materials Science. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3132540
ISBN:	0496797808

Nanoscale templating and self-assembly of organic semiconductors.
Hulvat, James Francis.

Nanoscale templating and self-assembly of organic semiconductors. - 267 p.

Source: Dissertation Abstracts International, Volume: 65-05, Section: B, page: 2576.

Thesis (Ph.D.)--Northwestern University, 2004.

Improvements in organic electronic materials could lead to novel device applications, ranging from large-area, flexible displays to light weight, plastic electronics. Progress on these applications would benefit from development of low-cost, aqueous, solution-based fabrication techniques for organic semiconductors. Supramolecular self-assembly enables molecules to organize in complex structures through non-covalent interactions. The nanoscale structure and aggregation of organic semiconductors influence conductivity, charge mobility and luminescence. We developed three approaches to enhance the performance of organic semiconductors through molecular self-assembly. The first uses a liquid crystalline (LC) template to mediate electrochemical polymerization of poly(3,4-ethyldioxythiophene) (PEDOT), a conducting polymer used for hole injection in organic light emitting diodes (OLED). Monomers were polymerized in the cylindrical, hydrophobic cores of a hexagonal, lyotropic LC formed by a non-ionic amphiphile in water, The templated, conducting polymer films exhibited anisotropic optical properties and increased conductivity as a direct result of the nanoscale, self-organized structure of the template. Another approach was used to control molecular order by preparing organic semiconductors that are themselves liquid crystalline. We developed a novel series of triblock oligo(phenylene vinylene) (OPV) amphiphiles that form thermotropic and lyotropic LC mesophases. The self-organized, layered structure of these mesophases influences aggregation of OPV, enhancing fluorescence in the liquid crystalline state compared with disordered films. These OPV-amphiphiles are the first example of a water-soluble oligo(phenylene vinylene) that can self-organize into aligned, well-ordered, highly fluorescent films. In a third system, a triblock, dendron rod-coil (DRC) molecule containing a quaterthiophene segment was prepared and its self-assembly and electronic properties investigated. In non-polar solvents, this molecule formed high aspect ratio, supramolecular nanowires containing stacked oligo(thiophene) segments. These self-assembled nanowires formed conductive films that were aligned by an electric field. Using these three systems, we demonstrate how nanoscale templating and self-assembly can enhance the performance of thiophene- and phenylene vinylene-based organic semiconductors.

ISBN: 0496797808Subjects--Topical Terms:

1017759
Engineering, Materials Science.

Nanoscale templating and self-assembly of organic semiconductors.
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