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O: Fachverband Oberflächenphysik

O 32: Electronic structure of surfaces: Spectroscopy, surface states I

O 32.3: Vortrag

Dienstag, 13. März 2018, 14:30–14:45, MA 004

Probing the electronic structure of atomically-thin carbon nitride nanosheets photocatalytsts by soft X-ray spectroscopies — •Jian Ren^1,2, Nannan Meng³, Iver Lauermann⁴, Bin Zhang³, and Tristan Petit¹ — ¹Institute of Methods for Material Development, Helmholtz-Zentrum Berlin für Materialen und Energie GmbH, Germany — ²Department of Physics, Freie Universität Berlin, Germany — ³Department of Chemistry, Tianjin University, China — ⁴PVcomB, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Germany

Polymeric carbon nitride (PCN) is a promising earth-abundant 2D material for solar energy conversion. Optical, electronic, and chemical properties of PCN materials can be manipulated by changing the size, composition, dimension and shape of their reactive (nano)domains. Exfoliation is a promising strategy to enhance PCN photocatalytic performance via preparation of ultrathin nanosheets. In this work, the electronic structures and surface chemistry of the oxygen- and amino group decorated atomically-thin PCN nanosheets, as determined from infrared, soft X-ray absorption and ultraviolet photoemission spectroscopies, will be detailed. A special attention will be given to determine the structure-performance relationship of PCN photocatalysts by comparing the photocatalytic activity of these different materials with their electronic and surface chemical properties. These measurements were performed at the BESSY II synchrotron in Berlin. Synchrotron radiation-based soft X-ray spectroscopies have become powerful techniques to investigate the electronic structure of 2D materials.