研究目的
Investigating the formation and properties of an extended chiral surface coordination network based on Ag7-clusters coordinated by dehydrogenated TMA molecules on the Ag(111) surface.
研究成果
The study concludes that TMA dehydrogenates completely upon annealing to 510 K and forms extended chiral domains of a metal-coordinated structure based on Ag7 clusters. This structure has a lower free energy per molecule under the experimental conditions than the hydrogen bonded structures observed after annealing to lower temperatures.
研究不足
The study is limited to the Ag(111) surface and TMA molecules. The formation of the structure is in direct competition with desorption of TMA from the surface at higher temperatures.
1：Experimental Design and Method Selection
The study involves the deposition of trimesic acid (TMA) onto the Ag(111) surface under ultra-high vacuum conditions followed by annealing to 510 K. Scanning tunneling microscopy (STM) and density functional theory (DFT) calculations are used to analyze the structure.
2：Sample Selection and Data Sources
TMA (98%, Alfa Aesar) molecules were evaporated onto Ag(111) at room temperature. The surface was cleaned by Ne sputtering and annealing to 800 K.
3：List of Experimental Equipment and Materials
Knudsen type evaporator for TMA deposition, ultra-high vacuum (UHV) system with base pressure of 1 × 10?10 mbar, STM for imaging.
4：Experimental Procedures and Operational Workflow
TMA was deposited at room temperature followed by annealing to 480-510 K. STM measurements were performed at room temperature.
5：Data Analysis Methods
DFT calculations were performed using the GPAW software and the ASE interface. The optB88-vdW functional was used for exchange and correlation.
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