Biswas Kalyan, Urgel José I, Xu Kun, Ma Ji, Sánchez-Grande Ana, Mutombo Pingo, Gallardo Aurelio, Lauwaet Koen, Mallada Benjamin, de la Torre Bruno, Matěj Adam, Gallego José M, Miranda Rodolfo, Jelínek Pavel, Feng Xinliang, Écija David
IMDEA Nanoscience, C/ Faraday 9, Campus de Cantoblanco, 28049, Madrid, Spain.
Center for Advancing Electronics and Faculty of Chemistry and Food Chemistry, Technical University of Dresden, 01062, Dresden, Germany.
Angew Chem Int Ed Engl. 2021 Nov 22;60(48):25551-25556. doi: 10.1002/anie.202111863. Epub 2021 Oct 21.
The atomically precise control over the size, shape and structure of nanographenes (NGs) or the introduction of heteroatom dopants into their sp -carbon lattice confer them valuable electronic, optical and magnetic properties. Herein, we report on the design and synthesis of a hexabenzocoronene derivative embedded with graphitic nitrogen in its honeycomb lattice, achieved via on-surface assisted cyclodehydrogenation on the Au(111) surface. Combined scanning tunnelling microscopy/spectroscopy and non-contact atomic force microscopy investigations unveil the chemical and electronic structures of the obtained dicationic NG. Kelvin probe force microscopy measurements reveal a considerable variation of the local contact potential difference toward lower values with respect to the gold surface, indicative of its positive net charge. Altogether, we introduce the concept of cationic nitrogen doping of NGs on surfaces, opening new avenues for the design of novel carbon nanostructures.
对纳米石墨烯（NGs）的尺寸、形状和结构进行原子精确控制，或将杂原子掺杂剂引入其sp - 碳晶格中，赋予了它们宝贵的电子、光学和磁性特性。在此，我们报告了一种在其蜂窝晶格中嵌入石墨氮的六苯并蔻衍生物的设计与合成，该衍生物通过在Au(111)表面进行表面辅助环脱氢反应制备而成。结合扫描隧道显微镜/光谱和非接触原子力显微镜研究揭示了所获得的双阳离子NG的化学和电子结构。开尔文探针力显微镜测量结果表明，相对于金表面，局部接触电势差朝着更低的值有显著变化，这表明其净电荷为正。总之，我们引入了表面上NGs阳离子氮掺杂的概念，为新型碳纳米结构的设计开辟了新途径。
