研究目的
To investigate the adsorption of perylene-3,4,9,10-tetracarboxylic acid dianhydride (PTCDA) on the clean and on the oxygen pre-covered Cu(100) surface by scanning tunneling microscopy (STM) and low energy electron diffraction (LEED), aiming to clarify the superstructure of PTCDA on Cu(100) and to gain new information about the possible dissociation of PTCDA upon adsorption on Cu(100).
研究成果
The study confirms the commensurate (4√2 × 5√2)R45° superstructure of PTCDA on Cu(100) and proposes a structure model with two intact PTCDA molecules within the unit cell. The formation of highly ordered domains requires deposition at 400 K. On the oxygen pre-covered Cu(100) surface, PTCDA forms an incommensurate monolayer, indicating a reduced interfacial interaction.
研究不足
The study is limited by the technical constraints of STM and LEED measurements under UHV conditions. The interpretation of STM contrast as an indication of identical adsorption sites may require validation by other methods. The study does not firmly prove the non-dissociative adsorption of PTCDA on Cu(100).
