AI Article Synopsis
- Understanding how different surface facets affect the behavior of ligands is key for creating efficient ligand-coated nanocrystals.
- Para-nitrothiophenol and nitronaphthalene were studied on Au nanocrystals, with specific focus on how these ligands interact with different facets using IR nanospectroscopy.
- Results showed that both ligands favored adsorption on (001) facets, but nitrothiophenol exhibited faster diffusion and stronger interactions with Au, affecting the stability and reactivity of the overall system.
Article Abstract
Analysis of the influence of dissimilar facets on the adsorption, stability, mobility, and reactivity of surface ligands is essential for designing ligand-coated nanocrystals with optimal functionality. Herein, para-nitrothiophenol and nitronaphthalene were chemisorbed and physisorbed, respectively, on Au nanocrystals, and the influence of different facets within a single Au nanocrystal on ligands properties were identified by IR nanospectroscopy measurements. Preferred adsorption was probed on (001) facets for both ligands, with a lower density on (111) facets. Exposure to reducing conditions led to nitro reduction and diffusion of both ligands toward the top (111) facet. Nitrothiophenol was characterized with a diffusivity higher than that of nitronaphthalene. Moreover, the strong thiol-Au interaction led to the diffusion of Au atoms and the formation of thiol-coated Au nanoparticles on the silicon surface. It is identified that the adsorption and reactivity of surface ligands were mainly influenced by the atomic properties of each facet, while diffusion was controlled by ligand-metal interactions.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10311598 | PMC |
| http://dx.doi.org/10.1021/acs.nanolett.3c00250 | DOI Listing |
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