This paper reports the synthesis of a water soluble conjugated polymer poly(p-phenylene vinyleneco-sodium methacrylate) (ws-P(PV-co-SMA)) and the multilayer of the derived copolymer assembling poly(diallyl dimethyl am...This paper reports the synthesis of a water soluble conjugated polymer poly(p-phenylene vinyleneco-sodium methacrylate) (ws-P(PV-co-SMA)) and the multilayer of the derived copolymer assembling poly(diallyl dimethyl ammanium chloride) (PDDA). The self-assembling process of the multilayer was monitored by UV-vis absorption spectroscopy, and the data indicated a linear increase in film thick- ness with a number of ws-P(PV-co-SMA)/PDDA bilayers. The alternative deposition of ws-P (PV-co-SMA) and PDDA allowed the insertion of a non-conjugated layer between the conjugated layers, thus the migration of the photogenerated polarons was effectively confined in the isolated ws-P (PV-co-SMA) chains. Consequently, the photoluminescence quantum yield reached 0.68, 30 times higher than that of pure poly(p-phenylen vinylene). The distinct electronic interactions between conjugated segments were confirmed by comparative analyses of the excitation spectra and time-resolved photoluminescence spectra of ws-P(PV-co-SMA) solid film and the assembled multilayers. The confinement effect of the PDDA layer on the photogenerated carriers was verified by the surface photovoltage spectroscopic measurement on both ws-P(PV-co-SMA) solid film and self-assembled multilayers.展开更多
基金Supported by the National Basic Research Program of China (Grant No. 2007CB 808000)Open Project of State Key Laboratory of Supramolecular Structure and Materials (Grant No. SKLSSM200705)
文摘This paper reports the synthesis of a water soluble conjugated polymer poly(p-phenylene vinyleneco-sodium methacrylate) (ws-P(PV-co-SMA)) and the multilayer of the derived copolymer assembling poly(diallyl dimethyl ammanium chloride) (PDDA). The self-assembling process of the multilayer was monitored by UV-vis absorption spectroscopy, and the data indicated a linear increase in film thick- ness with a number of ws-P(PV-co-SMA)/PDDA bilayers. The alternative deposition of ws-P (PV-co-SMA) and PDDA allowed the insertion of a non-conjugated layer between the conjugated layers, thus the migration of the photogenerated polarons was effectively confined in the isolated ws-P (PV-co-SMA) chains. Consequently, the photoluminescence quantum yield reached 0.68, 30 times higher than that of pure poly(p-phenylen vinylene). The distinct electronic interactions between conjugated segments were confirmed by comparative analyses of the excitation spectra and time-resolved photoluminescence spectra of ws-P(PV-co-SMA) solid film and the assembled multilayers. The confinement effect of the PDDA layer on the photogenerated carriers was verified by the surface photovoltage spectroscopic measurement on both ws-P(PV-co-SMA) solid film and self-assembled multilayers.
