Abstract
AbstractIn order to prepare flexible and ion conductive deoxyribonucleic acid (DNA) films without phase separation, DNA was modified with poly(ethylene oxide) (PEO). PEOs with molecular weight of 150 to 2000 were fixed to the amino groups of nucleic acid bases in DNA (PEO‐DNA). Brittle DNA films turned flexible after PEO modification, and the highest ionic conductivity was obtained when PEO with molecular weight of 1000 was modified. Though Na+, counter cation of phosphate group, was expected to migrate in these PEOx‐DNA hybrids as a carrier ion, ionic conductivity was only 1.3 × 10−6 S cm−1. Addition of salts to PEO1000‐DNA considerably improved the ionic conductivity, and sodium bis(trifluoromethanesulfonyl)imide (NaTFSI) was the best salt for this purpose. When NaTFSI, 5 mol% to the oxyethylene (OE) unit, was mixed with PEO1000‐DNA, the highest ionic conductivity of 1.77 × 10−5 S cm−1 was observed at 30°C. Copyright © 2004 John Wiley & Sons, Ltd.
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