A solution-processable polymer-grafted graphene oxide derivative for nonvolatile rewritable memory

摘要: A new conjugated polymer, poly{[9,9-di(triphenylamine) fluorene]-[9,9-dihexylfluorene]-[4,4′-(9H-fluorene-9,9-diyl) dibenzenamine]}(PTHF), was synthesized by the Suzuki coupling reaction and used to react with graphene oxide (GO) containing surface-bonded acyl chloride moieties give a solution-processable GO–PTHF. Covalent attachment of PTHF onto GO resulted in partial fluorescence quenching parent suggesting energy and/or electron transfer between excited singlet states moiety moiety. The absolute photoluminescence (PL) quantum yields (ΦPL) samples were changed from 0.59 for 0.31 light-induced paramagnetic resonance (LEPR) technique employed study photoinduced spins Upon irradiation 432 nm laser, both polaron signals polymer chain at g = 2.1132, 2.0665 2.0197, radical anions on g// 1.9726 g⊥ 1.9747 kept unchanged, while signal 2.0002 almost completely disappeared due typical selective triplet state or spin polarization process acting radical–triplet pair mechanism. memory device based GO–PTHF, which GO–PTHF film sandwiched indium–tin Al electrodes, can be switched ON under negative electrical sweep, also reset initial OFF reverse (positive) sweep.