Organic photothermal materials have aroused more and more attentions, due to their unique merits of diverse structure, tunable property, and good biocompatibility. However, most of them suffered from complicated design and high cost in extending the molecular conjugation for long-wavelength absorption. Herein, we interestingly discovered a typical organic conjugated molecule, 4,6-di(2-thienyl)thieno[3,4-c][1,2,5]thiadiazole () with low molecular weight of only 306 g mol and simple structure, to exhibit superior photothermal performance under aggregation. with rigid and planar molecular skeleton was endowed with diradical feature and could aggregate closely in π-π stacking, extending the absorption to cover from 300 to 1000 nm for effective sunlight absorption and facilitating the high photothermal conversion efficiency of 65.5 % under 685 nm laser. On this basis, was successfully applied in solar-driven water evaporation to obtain a considerable evaporation efficiency of 85.2 % and water evaporation rate of 1.2366 kg m h under 1 sunlight irradiation. This finding would light up the enthusiasm in constructing high-efficiency but simple organic small-molecule photothermal materials.

中文翻译：

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用于高效光热水蒸发的低分子量有机小分子光热材料


有机光热材料以其结构多样、性能可调、生物相容性好等独特优点越来越受到人们的关注。然而，它们中的大多数都面临着复杂的设计和延长分子共轭以实现长波长吸收的高成本。在这里，我们有趣地发现了一种典型的有机共轭分子，4,6-二(2-噻吩基)噻吩并[3,4-c][1,2,5]噻二唑()，其分子量仅为306 g mol，结构简单。结构，在聚集下表现出优异的光热性能。具有刚性和平面的分子骨架，赋予双自由基特征，可以紧密聚集成π-π堆积，将吸收范围扩大到300至1000 nm，有效吸收太阳光，并在685 nm激光下实现65.5%的高光热转换效率。在此基础上，成功应用于太阳能驱动水蒸发，在1次阳光照射下，获得了高达85.2%的蒸发效率和1.2366 kg·m·h的水蒸发率。这一发现将点燃构建高效但简单的有机小分子光热材料的热情。