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Faculty for Biology, Chemistry, and Earth Sciences

Macromolecular Chemistry I:

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Alagiriswamy, A.A.; Jäger, C.; Haarer, D.; Thelakkat, M.; Knoll, A.; Krausch, G.: Local potential distribution of macrophase separated polymer blend domains, Journal of Physics D: Applied Physics, 40(16), 4855-4865 (2007)
Key words: B4
Local surface potential measurements on alkoxy-substituted poly (p-phenylene ethynylene), poly (EHO-OPPE), as an electron transport material (ETM) and poly (tri-Ph diamine), poly (TPD), as a hole transport material (HTM) and their blends in three different compns. (1: 3, 1: 1, 3: 1) were performed by using scanning Kelvin force microscopy (SKFM). Simultaneously the topog. of all surfaces was obtained using at. force microscopy (AFM). In this paper, we propose a new principle for mapping out the local surface potential distributions of macrophase sepd. segments in the model polymer blend systems through the combined mode of intermittent contact AFM-SKFM techniques. The energetics and kinetics involved are also discussed in terms of potential distributions in the different phases of surface morphologies in the single-layered pristine as well as single-layered two component polymer blend systems. The exptl. results provide considerable insight into the elec./electronic properties of these ETM and HTM materials and reveal highly qual. information for the first time to show a direct conformation of apparent work function difference between the ETM rich and HTM rich components. Finally, an attempt has been made to perform the combined approaches of valuable and high resoln. complementary techniques such as SEM, absorption and photoluminescence spectra in order to correlate the obsd. contact p.d./surface p.d. between the two rich ETM and HTM components obtained from microscopic and macroscopic scans

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