Statistical analysis of support thickness and particle size effects in HRTEM imaging of metal nanoparticles
| Autor: | Ross V. Grieshaber, Eric A. Stach, Jim Ciston, Zhongfan Zhang, Cecile S. Bonifacio, Stephen D. House, Long Li, Judith C. Yang |
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| Rok vydání: | 2016 |
| Předmět: |
Support effect
Nanostructure Materials science Microscope HRTEM Silicon Nanoparticle chemistry.chemical_element Bioengineering Nanotechnology 02 engineering and technology Optical Physics 010402 general chemistry 01 natural sciences Atomic law.invention Particle and Plasma Physics law Nuclear High-resolution transmission electron microscopy Instrumentation Cs aberration Microscopy Image artifacts Molecular Particle size 021001 nanoscience & nanotechnology Atomic and Molecular Physics and Optics 0104 chemical sciences Electronic Optical and Magnetic Materials Other Physical Sciences Amorphous carbon chemistry Transmission electron microscopy Nanoparticles 0210 nano-technology |
| Zdroj: | House, SD; Bonifacio, CS; Grieshaber, RV; Li, L; Zhang, Z; Ciston, J; et al.(2016). Statistical analysis of support thickness and particle size effects in HRTEM imaging of metal nanoparticles. Ultramicroscopy, 169, 22-29. doi: 10.1016/j.ultramic.2016.06.007. Lawrence Berkeley National Laboratory: Retrieved from: http://www.escholarship.org/uc/item/4459t8mw |
| DOI: | 10.1016/j.ultramic.2016.06.007. |
| Popis: | © 2016 Elsevier B.V. High-resolution transmission electron microscopy (HRTEM) examination of nanoparticles requires their placement on some manner of support – either TEM grid membranes or part of the material itself, as in many heterogeneous catalyst systems – but a systematic quantification of the practical imaging limits of this approach has been lacking. Here we address this issue through a statistical evaluation of how nanoparticle size and substrate thickness affects the ability to resolve structural features of interest in HRTEM images of metallic nanoparticles on common support membranes. The visibility of lattice fringes from crystalline Au nanoparticles on amorphous carbon and silicon supports of varying thickness was investigated with both conventional and aberration-corrected TEM. Over the 1–4 nm nanoparticle size range examined, the probability of successfully resolving lattice fringes differed significantly as a function both of nanoparticle size and support thickness. Statistical analysis was used to formulate guidelines for the selection of supports and to quantify the impact a given support would have on HRTEM imaging of crystalline structure. For nanoparticles ≥1 nm, aberration-correction was found to provide limited benefit for the purpose of visualizing lattice fringes; electron dose is more predictive of lattice fringe visibility than aberration correction. These results confirm that the ability to visualize lattice fringes is ultimately dependent on the signal-to-noise ratio of the HRTEM images, rather than the point-to-point resolving power of the microscope. This study provides a benchmark for HRTEM imaging of crystalline supported metal nanoparticles and is extensible to a wide variety of supports and nanostructures. |
| Databáze: | OpenAIRE |
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