Reversibly Slowing Dewetting of Conjugated Polymers by Light
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- 作者：Ioan Botiz ; Paul Freyberg ; Natalie Stingelin ; Arnold Chang-Mou Yang ; G眉nter Reiter
- 刊名：Macromolecules
- 出版年：2013
- 出版时间：March 26, 2013
- 年：2013
- 卷：46
- 期：6
- 页码：2352-2356
- 全文大小：333K
- 年卷期：v.46,no.6(March 26, 2013)
- ISSN：1520-5835
文摘
Dewetting, i.e., the retraction of a fluid from a surface it 鈥渄islikes鈥? is a macroscopic phenomenon controlled through parameters like viscosity and surface tension on length-scales much larger than the size of the molecules. So far, dewetting was known to proceed in the same manner, independent of the dewetting film being illuminated by light or not, e.g., through an optical microscope. Here, we demonstrate that the velocity of dewetting of conjugated polymers can be reversibly tuned through appropriate exposure to light. We relate this observation to the absorption of photons of suitable energy resulting in the generation of excitons which may partially delocalize along and across polymer chains and so induce changes in polymer chain conformation. Such changes, in turn, may cause stiffening or overlap of polymer chains and thus lead to macroscopically detectable differences in behavior of an ensemble of conjugated molecules expressed via material properties like viscosity.