研究目的
Investigating the vibrational spectra of thiolate-protected gold nanoclusters to understand their size- and temperature-dependent ordering behavior of organic monolayers.
研究成果
The study successfully measured and assigned vibrational spectra of thiolate-protected gold nanoclusters, revealing temperature- and size-dependent behaviors. The conformational changes in ligands were explained by DFT calculations, providing insights into the coordination structure of ligated Au nanoclusters.
研究不足
The study is limited by the sensitivity of IRAS to the deposited NCs in a low density and the challenge of evaluating dynamic behaviors of ligands in a solid single crystal.
1：Experimental Design and Method Selection:
The study employed infrared re?ection absorption spectroscopy (IRAS) to measure vibrational spectra of thiolate-protected gold nanoclusters prepared using the Langmuir?Blodgett method.
2：Sample Selection and Data Sources:
Size-selected gold nanoclusters ligated by dodecanethiolate or 2-phenylethane-1-thiolate were synthesized in the solution-phase and transferred onto an Au(111) single-crystal substrate.
3：List of Experimental Equipment and Materials:
A Bruker IFS 66v/s FT-IR spectrometer, a liquid-nitrogen-cooled mercury cadmium telluride (MCT) detector, and an Au(111) single crystal were used.
4：Experimental Procedures and Operational Workflow:
The monolayers were fabricated using the Langmuir?Blodgett method, and IRAS measurements were conducted at temperatures ranging from 100 to 340 K.
5：Data Analysis Methods:
The IRAS spectra were analyzed with the aid of density functional theory (DFT) calculations to assign vibrational modes and understand conformational changes.
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