Incorporation of well-dispersed sub-5-nm graphitic pencil nanodots into ordered mesoporous frameworks
Incorporation of well-dispersed sub-5-nm graphitic pencil nanodots into ordered mesoporous frameworks
复制标题
将分散良好的亚 5 nm 石墨铅笔纳米点纳入有序介孔框架中
DOI：
10.1038/nchem.2405
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发表时间：
2016-02-01
期刊：
影响因子：
21.8
通讯作者：
Zhao, Dongyuan
中科院分区：
文献类型：
--
作者：
Kong, Biao;Tang, Jing;Zhao, Dongyuan
在过去的几十年里，将光学纳米材料直接组装成有序的介孔骨架已被证明是一个相当大的挑战。在这里，我们建议将超小(亚5 nm)的石墨化铅笔纳米点结合到有序的介孔骨架中来制备光电材料。由典型的商用石墨铅笔通过电化学剪裁工艺制备的纳米点具有尺寸均匀(类似于3 nm)、良好的分散性和高光电转化效率(类似于27%)等特性。在氢键的驱动下，这些纳米点被结合到各种有序的介孔骨架(二氧化钛、二氧化硅、碳和二氧化硅-碳材料)中，并与骨架的前驱体进行共组装。得到的材料显示出高度的有序性，并且它们的光学性能(例如，光电流密度)急剧增加。我们预计，大规模合成超小的碳纳米点并将其融入有序的介孔骨架中，将有助于制备具有各种光学性能的材料。
Over the past few decades the direct assembly of optical nanomaterials into ordered mesoporous frameworks has proved to be a considerable challenge. Here we propose the incorporation of ultrasmall (sub-5-nm) graphitic pencil nanodots into ordered mesoporous frameworks for the fabrication of optoelectronic materials. The nanodots, which were prepared from typical commercial graphite pencils by an electrochemical tailoring process, combine properties such as uniform size (similar to 3 nm), excellent dispersibility and high photoconversion efficiency (similar to 27%). These nanodots were incorporated into a variety of ordered mesoporous frameworks (TiO2, silica, carbon and silica-carbon materials) by co-assembly, driven by hydrogen bonding, with the frameworks' precursors. The resulting materials showed a high degree of ordering, and a sharp increase in their optical performance (for example, photocurrent density). We envisage that the large-scale synthesis of ultrasmall carbon nanodots and their incorporation into ordered mesoporous frameworks may facilitate the preparation of materials with a variety of optical properties.