In this study, we investigated mechanisms of photoinduced electron transfer from a conjugated polymer (poly(2-methoxy-5-(2-ethylhexyloxy) 1,4-phenylenevinylene (MEH-PPV) to titanium dioxide (TiO₂) nanoparticles (acceptor) through steady-state photoluminescence (PL) spectroscopy. Since mixed phase TiO₂ has better photocatalytic compared to single phase, it is an efficient charge separation process during photoexcitation of polymer nanocomposites by incorporating the mixed phase TiO₂ nanoparticles into the MEH-PPV polymer matrix through in situ polymerization. Structural characterization revealed only physical interaction between the polymer matrix and dispersed nanoparticles. The absorbance spectra of nanocomposites also indicated the absence of ground state complex formation. Luminescence quenching of polymer nanocomposites compared to pristine MEH-PVV signifies the charge transfer taking place at the MEH-PPV/TiO₂ interfaces. Thus, the MEH-PPV/ mixed phase TiO₂ nanocomposite serves as an active layer for photovoltaic application.

中文翻译：

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MEH-PPV与二氧化钛纳米粒子界面的光诱导电荷转移机理

在这项研究中，我们研究了从共轭聚合物（聚（2-甲氧基-5-（2-乙基己氧基）1,4-亚苯基亚乙烯基（MEH-PPV））到二氧化钛（TiO ₂）纳米粒子（受体）的光诱导电子转移的机理。通过稳态光致发光（PL）光谱，由于混合相TiO ₂与单相相比具有更好的光催化作用，因此通过将混合相TiO ₂纳米粒子掺入MEH-PPV聚合物基体中，这是在聚合物纳米复合材料光激发过程中的有效电荷分离过程。通过原位聚合。结构表征显示聚合物基质和分散的纳米颗粒之间仅发生物理相互作用。纳米复合材料的吸收光谱也表明没有基态复合物的形成。与原始MEH-PVV相比，聚合物纳米复合材料的发光猝灭表明在MEH-PPV / TiO ₂界面处发生了电荷转移。因此，MEH-PPV /混合相TiO ₂纳米复合材料用作光伏应用的活性层。