研究目的
Investigating the photo-switching behavior of individual organic molecules using annular dark-field scanning transmission electron microscopy (ADF-STEM) with a graphene support, focusing on the structural changes of azobenzene derivatives decorated with single transition metal atoms (Pt) as markers.
研究成果
The study successfully demonstrated the use of ADF-STEM to directly image and track the photo-switching behavior of individual organic molecules on graphene, showing a decrease in Pt-Pt distances indicative of trans-to-cis isomerization. This method provides a powerful tool for studying complex organic materials at the single molecule level.
研究不足
The study is limited by the electron beam-induced degradation of organic molecules and the presence of amorphous carbon on graphene, which can affect the clarity of imaging and the accuracy of distance measurements between Pt atoms.
1：Experimental Design and Method Selection
The study utilized ADF-STEM to image photo-switching azobenzene derivatives on a graphene support. The molecules were designed with Pt atoms as markers to track structural changes.
2：Sample Selection and Data Sources
Azobenzene derivatives with terpyridine ligands for binding Pt atoms were synthesized and deposited on monolayer graphene supported on a TEM grid.
3：List of Experimental Equipment and Materials
JEOL ARM200F at 80 kV for ADF-STEM imaging, UV lamp (365 nm, 100 W) for photo-switching, graphene grown by chemical vapor deposition (CVD) on copper foil.
4：Experimental Procedures and Operational Workflow
Molecules were dropcast onto graphene, and the TEM grid was baked to remove solvents. UV irradiation was used to induce photo-switching, followed by ADF-STEM imaging to observe structural changes.
5：Data Analysis Methods
The distance between Pt atoms in the molecules was measured from ADF-STEM images to track structural changes indicative of trans-to-cis isomerization.
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