Multidimensional Characterization of Mixed Ligand Nanoparticles Using Small Angle Neutron Scattering
| Autor: | Zhi Luo, Francesco Stellacci, Aurel Radulescu, Tamim A. Darwish, Joachim Kohlbrecher, Quy Khac Ong, Ye Yang, Stefan Guldin |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
General Chemical Engineering Shell (structure) Nanoparticle 02 engineering and technology 010402 general chemistry 01 natural sciences Nanomaterials Metal nanocrystals Materials Chemistry surface nanomaterials scanning-tunneling-microscopy behavior Ligand Solvation General Chemistry 021001 nanoscience & nanotechnology phase-separation Small-angle neutron scattering 0104 chemical sciences x-ray shell Colloidal gold gold nanoparticles visual_art visual_art.visual_art_medium Physical chemistry protected metal nanoparticles 0210 nano-technology |
| Zdroj: | Chemistry of Materials |
| ISSN: | 1520-5002 0897-4756 |
| DOI: | 10.1021/acs.chemmater.9b01209 |
| Popis: | The properties of ligand protected gold nanoparticles are determined by the synergistic interplay of their structural components, including the metal core, the ligand shell, and the solvation layer. However, the simultaneous characterization of all these components remains a major challenge given their disparate chemical nature. In the case of mixed ligand nanoparticles, this task becomes daunting due to the presence of intercorrelated additional parameters such as the ligand ratio, ligand spatial distribution, and solvation of the heterogeneous ligand shell. Here we show that small angle neutron scattering (SANS) is a tool capable of simultaneously characterizing the core and the ligand shell of monodisperse mixed ligand gold nanoparticles. We systematically examine how each parameter (e.g., the core size, the thickness, composition and the spatial heterogeneity of the ligand shell) affects nanoparticles' scattering profile. Quantitative information on these parameters is retrieved using analytical fitting as well as 3D modeling. Importantly, we show that SANS can evaluate the solvation degree of mixed ligand protected gold nanoparticles, a challenging task for any other characterization methods. |
| Databáze: | OpenAIRE |
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