On the interpretation of the forbidden spots observed in the electron diffraction patterns of flat Au triangular nanoparticles

Reyes‐Gasga, J.; Gómez-Rodríguez, A.; Gao, Xiaoxia; José–Yacamán, Miguel

doi:10.1016/j.ultramic.2008.03.005

Cited by 49 publications

(50 citation statements)

References 24 publications

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“…2c, d, g and h. Their presence in boron-rich platelets has been reported in previous research without detailed discussion [26] or the diffraction patterns are mis-interpreted [23,25,[27][28][29]31,32]. Fractional diffraction spots along specific zone axes are the result of structural incompleteness in crystals [36]. However, it is difficult to detect the intrinsic defects as they are perpendicular to the electron beam direction.…”

Section: Resultsmentioning

confidence: 82%

Twin-plane reentrant edge growth of rhombohedra boron suboxide platelets

Jiang

Yuan

et al. 2010

Journal of Crystal Growth

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Section: Resultsmentioning

confidence: 82%

Twin-plane reentrant edge growth of rhombohedra boron suboxide platelets

Jiang

Yuan

et al. 2010

Journal of Crystal Growth

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“…The weak diffractions inside are forbidden (1/3{422}) but appear as a result of surface terminations, a more signifi cant phenomenon for nanostructures with higher ratios of surface atom (see Fig. S-3 in the ESM) [19,20]. We emphasize the relative intensity of various refl ections.…”

Section: Hrtem Characterization Of Diamond and Wurtzite Sinwsmentioning

confidence: 90%

Kinetically-induced hexagonality in chemically grown silicon nanowires

Liu

Wang

2009

Nano Res.

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Various silicon crystal structures with different atomic arrangements from that of diamond have been observed in chemically synthesized nanowires. The structures are typified by mixed stacking mismatches of closely packed Si dimers. Instead of viewing them as defects, we defi ne the concept of hexagonality and describe these structures as Si polymorphs. The small transverse dimensions of a nanowire make this approach meaningful. Unique among the polymorphs are cubic symmetry diamond and hexagonal symmetry wurtzite structures. Electron diffraction studies conducted with Au as an internal reference unambiguously confi rm the existence of the hexagonal symmetry Si nanowires.Cohesive energy calculations suggest that the wurtzite polymorph is the least stable and the diamond polymorph is the most stable. Cohesive energies of intermediate polymorphs follow a linear trend with respect to their structural hexagonality. We identify the driving force in the polymorph formations as the growth kinetics. Fast longitudinal elongation during the growth freezes stacking mismatches and thus leads to a variety of Si polymorphs. The results are expected to shed new light on the importance of growth kinetics in nanomaterial syntheses and may open up ways to produce structures that are uncommon in bulk materials.

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“…These domains are crystallographically inter-related as can be seen by examining the corresponding DDPs ((i) to (iv)). These explanations are discussed by Reyes-Gasga et al 36 and in references therein. These are indicated by arrows in the image in Fig.…”

Section: Hrtem Analysismentioning

confidence: 94%

Structural characterisation of printable noble metal/poly(vinyl-alcohol) nanocomposites for optical applications

2015

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In order to enable exploitation of noble metal/poly(vinyl-alcohol) nanocomposites for device fabrication, solutions of poly(vinyl-alcohol) suitable for piezo-driven inkjet printing techniques are identified and discussed in terms of their material properties. The printable poly(vinyl-alcohol) medium is then exploited as a host material through the formation of silver or gold nanoparticles in order to create nanocomposites that exhibit a surface plasmon resonance behaviour associated with the small metallic inclusions. To mitigate some of the material redistribution effects associated with the drying of printed droplets containing finely divided materials, the metallic nanoparticles are formed after the printing and drying process is completed, by way of an in situ reduction of an appropriate metal salt by the poly(vinyl-alcohol)-host matrix itself, which takes place at modest temperatures compatible with most substrate materials. An obvious application for such nanocomposites is in optical elements whereby the surface plasmon resonance associated with the metal is the functional aspect of devices such as sensors or active optical elements. High Resolution Transmission Electron Microscopy was used to examine the dimensions, distribution, morphology and crystal structure of the silver and gold nanoparticles in detail allowing discussion of their suitability for these applications and what further optimisation may be necessary to adequately control their formation.

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On the interpretation of the forbidden spots observed in the electron diffraction patterns of flat Au triangular nanoparticles

Cited by 49 publications

References 24 publications

Twin-plane reentrant edge growth of rhombohedra boron suboxide platelets

Twin-plane reentrant edge growth of rhombohedra boron suboxide platelets

Kinetically-induced hexagonality in chemically grown silicon nanowires

Structural characterisation of printable noble metal/poly(vinyl-alcohol) nanocomposites for optical applications

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