光掺杂ITO纳米晶的多电荷转移
Multi-charge Transfer from Photodoped ITO Nanocrystals
摘要：
金属氧化物纳米晶体是一种非常通用的材料，可用于解决当前能源转换技术的许多挑战性需求。能够充分利用它们的潜力不仅是一种优势，也是一种更可持续的能源技术的科学和经济雄心。在这个方向上，金属氧化物纳米晶体的光掺杂是非常值得注意的过程，其允许在光吸收之后每个纳米晶体积累多个载流子。光掺杂电子的反应性是目前深入研究的主题。在这种情况下，有效提取存储的电子的可能性对于许多过程都是有益的，从光转换和太阳光能量存储，到电子转移和光电化学。在这项工作中，我们提供了，通过氧化滴定和光谱，多电子转移过程的证据，从光掺杂的Sn：In2O3纳米晶体的广泛使用的有机电子受体（F4TCNQ）。这项研究的结果揭示了光掺杂电子驱动化学反应的潜力，涉及一个以上的电子在同一时间。
英文摘要：
Metal oxide nanocrystals are emerging as extremely versatile material for addressing many of the current challenging demands of energy-conversion technology. Being able to exploit their full potential is not only an advantage but also a scientific and economic ambition for a more sustainable energy technology. In this direction, photodoping of metal oxide nanocrystals is a very notable process that allows accumulating multiple charge carriers per nanocrystals after light absorption. The reactivity of the photodoped electrons is currently the subject of an intense study. In this context, the possibility to efficiently extract the stored electrons could be beneficial for numerous processes, from photoconversion and sunlight energy storage, to photocatalysis and photoelectrochemistry. In this work we provide, via oxidative titration and optical spectroscopy, evidence for multi-electron transfer processes from photodoped Sn:In2O3 nanocrystals to a widely employed organic electron acceptor (F4TCNQ). The results of this study disclose the potential of photodoped electrons to drive chemical reactions involving more than one electron at a time.
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