PIXE microprobe studies of gold-cadmium alloys processed by local diffusion

Decroupet, D.; Demortier, G.

doi:10.1016/0168-583x(90)90300-j

Cited by 5 publications

(1 citation statement)

References 10 publications

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“…Diffusion in a substitutional solid solution is accompanied by the so-called vacancy drift, which is not balanced if the diffusion coefficients of the two atomic species are different. In the present case, they are indeed very different (D Cd /D Au ≈ 8 at 1000K) [38] so that a number of vacancies approximately equal to the number of atoms dissolved is driven towards the interface, where they have to diffuse to the surface. As a result the nanoparticle tends to assume a bulb-like shape: this is indeed what we observe in Fig.…”

Section: Negative Growth and Nanoparticle Shapementioning

confidence: 58%

Nanowire growth and sublimation: CdTe quantum dots in ZnTe nanowires

Orrù

Robin

Hertog

et al. 2018

Phys. Rev. Materials

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The role of the sublimation of the compound and of the evaporation of the constituents from the gold nanoparticle during the growth of semiconductor nanowires is exemplified with CdTe-ZnTe heterostructures. Operating close to the upper temperature limit strongly reduces the amount of Cd present in the gold nanoparticle and the density of adatoms on the nanowire sidewalls. As a result, the growth rate is small and strongly temperature dependent, but a good control of the growth conditions allows the incorporation of quantum dots in nanowires with sharp interfaces and adjustable shape, and it minimizes the radial growth and the subsequent formation of additional CdTe clusters on the nanowire sidewalls, as confirmed by photoluminescence. Uncapped CdTe segments dissolve into the gold nanoparticle when interrupting the flux, giving rise to a bulb-like (pendant-droplet) shape attributed to the Kirkendall effect.

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Section: Negative Growth and Nanoparticle Shapementioning

confidence: 58%