| 1. |
- Mayence, Arnaud, et al.
(författare)
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Phase Identification and Structure Solution by Three-Dimensional Electron Diffraction Tomography : Gd-Phosphate Nanorods
- 2014
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Ingår i: Inorganic Chemistry. - : American Chemical Society (ACS). - 0020-1669 .- 1520-510X. ; 53:10, s. 5067-5072
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Tidskriftsartikel (refereegranskat)abstract
- Hydrothermal synthesis of GdPO4 in the presence of poly(methacrylic acid) yields nanorods with a diameter of 15 nm and an aspect ratio of 20. Powder X-ray diffraction patterns showed that the GdPO4 nanorods display peaks characteristics for both monoclinic and hexagonal structures. Three-dimensional electron diffraction tomography (3D EDT) was used to determine the structures ab initio on the basis of reciprocal volume reconstruction of electron diffraction data sets collected from single nanorods. The crystal structure of the monoclinic form was shown to be P2(1)/n, corroborating previous work. We were able to solve the 3D structure of the hexagonal P6(2)22 form, which has not been reported previously. Our work shows that 3D EDT is a powerful method that can be used for solving structures of single nano crystals.
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| 2. |
- Mayence, Arnaud, et al.
(författare)
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Probing planar defects in nanoparticle superlattices by 3D small-angle electron diffraction tomography and real space imaging
- 2014
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Ingår i: Nanoscale. - 2040-3364 .- 2040-3372. ; 6:22, s. 13803-13808
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Tidskriftsartikel (refereegranskat)abstract
- We demonstrate how the acquisition and processing of 3D electron diffraction data can be extended to characterize structural features on the mesoscale, and show how lattice distortions in superlattices of self-assembled spherical Pd nanoparticles can be quantified by three-dimensional small-angle electron diffraction tomography (3D SA-EDT). Transmission electron microscopy real space imaging and 3D SA-EDT reveal a high density of stacking faults that was related to a competition between fcc and hcp arrangements during assembly. Information on the orientation of the stacking faults was used to make analogies between planar defects in the superlattices and Shockley partial dislocations in metallic systems.
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| 3. |
- Navarro, Julien R. G., et al.
(författare)
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WO3 Nanorods Created by Self-Assembly of Highly Crystalline Nanowires under Hydrothermal Conditions
- 2014
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Ingår i: Langmuir. - : American Chemical Society (ACS). - 0743-7463 .- 1520-5827. ; 30:34, s. 10487-10492
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Tidskriftsartikel (refereegranskat)abstract
- WO3 nanorods and wires were obtained via hydrothermal synthesis using sodium tungstate as a precursor and either oxalic acid, citric acid, or poly(methacrylic add) as a stabilizing agent. Transmission electron microscopy images showed that the organic acids with different numbers of carboxylic groups per molecule influence the final sizes and stacking nanostructures of WO3 wires. Three-dimensional electron diffraction tomography of a single nanocrystal revealed a hexagonal WO3 structure with preferential growth along the c-axis, which was confirmed by high-resolution transmission electron microscopy. WO3 nanowires were also spin-coated onto an indium tin oxide/glass conducting substrate, resulting in the formation of a film that was characterized by scanning electron microscopy. Finally, cyclic voltammetry measurements performed on the WO3 thin film showed voltammograms typical for the WO3 redox process.
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| 4. |
- Wetterskog, Erik, et al.
(författare)
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Precise control over shape and size of iron oxide nanocrystals suitable for assembly into ordered particle arrays
- 2014
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Ingår i: Science and Technology of Advanced Materials. - : Informa UK Limited. - 1468-6996 .- 1878-5514. ; 15:5
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Tidskriftsartikel (refereegranskat)abstract
- Here we demonstrate how monodisperse iron oxide nanocubes and nanospheres with average sizes between 5 and 27 nm can be synthesized by thermal decomposition. The relative importance of the purity of the reactants, the ratio of oleic acid and sodium oleate, the maximum temperature, and the rate of temperature increase, on robust and reproducible size and shape-selective iron oxide nanoparticle synthesis are identified and discussed. The synthesis conditions that generate highly monodisperse iron oxide nanocubes suitable for producing large ordered arrays, or mesocrystals are described in detail.
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