Band edge modulated conjugated polymers for oxidation prevention
Literature Information
Rajashree Y. Mahale, Arulraj Arulkashmir, Kingshuk Dutta, Kothandam Krishnamoorthy
The impact of electron transfer (ET) from a series of band edge modulated polymers to atmospheric oxygen is examined in connection with substrate oxidation prevention. Polymers with the highest occupied molecular orbital (HOMO) energy level below and above the oxygen energy level were tested and the former showed better efficiency. Furthermore, the oxidation prevention efficiency of a polymer with lower HOMO increased by two orders of magnitude, when the pores on the film were filled with spherical molecules, [6,6]-phenyl-C61-butyric acid methyl ester. We found that the polymer surface hydrophobicity has little or no influence on oxidation prevention. It is interesting to note that a polymer with a hole mobility of 8 × 10−10 cm2 V−1 s−1 showed a two-fold increase in oxidation prevention efficiency compared to a polymer with a hole mobility of 6 × 10−5 cm2 V−1 s−1. Over all, from the concerted approach, we conclude that a polymer devoid of pores with the HOMO energy level below oxygen and low charge carrier mobility is a suitable candidate for prevention of substrate oxidation/corrosion.
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