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Photochemical synthesis of oligothiophene thin films and nano-patterns in condensed multilayer films of 2,5-diiodothiophene—Effects of surface chemistry of substrates by Seong H. Kim; Sudarshan Natarajan; Guangming Liu is a Materials Science article available to read on EtoBox.

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This paper reviews photochemical reactions of 2,5-diiodothiophene multilayers on various solid substrates that lead to production of oligothiophene thin films and micro-patterns with a thickness relevant to nanotechnology applications. Upon UV absorption, the C-I bond of 2,5diiodothiophene dissociates generating a thienyl radical and iodine atom. The radicals generated in multilayers can react with other radicals or intact monomers to form dimers. Since the C-I bonds are present at the ends of the coupling reaction product, further photodissociation and coupling reactions can take place forming oligomeric species. On inert substrates, the average conjugation length of the product is about 3-4 thienyl units. Various pattern generation schemes can be incorporated with this photochemical reaction. Examples of masked irradiation, wettability pre-patterning, and controlled clustering of thermal desorption process are demonstrated. On copper surfaces, the average conjugation length of the produced oligothiophene is increased to 6-7 units, which is long enough for technical applications. This increase is due to Ullmann coupling reactions at the buried interface between the copper and adso

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Author

Seong H. Kim; Sudarshan Natarajan; Guangming Liu

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0920-5861)

Published

2007

Language

EN

Field

Materials Science (Physical Sciences)