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Ultrafast excited state deactivation of doped porous anodic alumina membranes

机译：掺杂多孔阳极氧化铝膜的超快激发态失活

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摘要

Free-standing, bi-directionally permeable and ultra-thin anodic aluminum oxide (AAO) membranes establish attractive templates (host) for the synthesis of nano-dots and rods of various materials (guest). This is due to their chemical and structural integrity and high periodicity on length scales of 5-150 nm which are often used to host photoactive nano-materials for various device applications including dye-sensitized solar cells. In the present study, AAO membranes are synthesized by using electrochemical methods and a detailed structural characterization using FEG-SEM, XRD and TGA confirms the porosity and purity of the material. Defect-mediated photoluminescence quenching of the porous AAO membrane in the presence of an electron accepting guest organic molecule (benzoquinone) is studied by means of steady-state and picosecond/femtosecond-resolved luminescence measurements. Using time-resolved luminescence transients, we have also revealed light harvesting of complexes of porous alumina impregnated with inorganic quantum dots (Maple Red) or gold nanowires. Both the F?rster resonance energy transfer and the nano-surface energy transfer techniques are employed to examine the observed quenching behavior as a function of the characteristic donor-acceptor distances. The experimental results will find their relevance in light harvesting devices based on AAOs combined with other materials involving a decisive energy/charge transfer dynamics.
机译：独立的，双向可渗透的超薄阳极氧化铝（AAO）膜为各种材料（来宾）的纳米点和棒的合成建立了引人注目的模板（主体）。这是由于它们的化学和结构完整性以及在5-150 nm的长度尺度上的高周期性，通常用于承载光敏纳米材料，用于各种设备应用，包括染料敏化太阳能电池。在本研究中，采用电化学方法合成了AAO膜，并使用FEG-SEM，XRD和TGA对结构进行了详细的表征，证实了材料的孔隙率和纯度。通过稳态和皮秒/飞秒分辨的发光测量，研究了在存在接受电子的客体有机分子（苯醌）的情况下，多孔AAO膜的缺陷介导的光致发光猝灭。使用时间分辨的发光瞬态，我们还揭示了用无机量子点（枫红）或金纳米线浸渍的多孔氧化铝配合物的光收集。弗斯特共振能量转移和纳米表面能量转移技术都被用来检查观察到的猝灭行为与特征施主-受主距离的关系。实验结果将在基于AAO和其他涉及决定性能量/电荷转移动力学的其他材料的光收集装置中发现它们的相关性。

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