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Sulfidation of Cadmium at the Nanoscale

Cabot, Andreu ; Smith, Rachel K ; Yin, Yadong ; Zheng, Haimei ; Reinhard, Björn M ; Liu, Haitao ; Alivisatos, A. Paul

ACS Nano, 2008-07, Vol.2 (7), p.1452-1458 [Periódico revisado por pares]

United States: American Chemical Society

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Título:
Sulfidation of Cadmium at the Nanoscale
Autor: Cabot, Andreu ; Smith, Rachel K ; Yin, Yadong ; Zheng, Haimei ; Reinhard, Björn M ; Liu, Haitao ; Alivisatos, A. Paul
Assuntos: CADMIUM ; Cadmium Compounds - chemistry ; CATIONS ; COALESCENCE ; Computer Simulation ; Crystallization - methods ; DIFFUSION ; hollow nanoparticle, Kirkendall effect, self-diffusion, diffusion mechanism, CdS, sulfidation ; INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY ; KIRKENDALL EFFECT ; Macromolecular Substances - chemistry ; MATERIALS SCIENCE ; Materials Testing ; Models, Chemical ; Models, Molecular ; Molecular Conformation ; NANOSCIENCE AND NANOTECHNOLOGY ; Nanostructures - chemistry ; Nanostructures - ultrastructure ; Nanotechnology - methods ; Particle Size ; Quantum Dots ; Selenium Compounds - chemistry ; SULFIDATION ; SULFUR ; Surface Properties ; SYMMETRY ; Titanium - chemistry ; VACANCIES
É parte de: ACS Nano, 2008-07, Vol.2 (7), p.1452-1458
Notas: ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
Materials Sciences Division
DE-AC02-05CH11231
LBNL-994E
Descrição: We investigate the evolution of structures that result when spherical Cd nanoparticles of a few hundred nanometers in diameter react with dissolved molecular sulfur species in solution to form hollow CdS. Over a wide range of temperatures and concentrations, we find that rapid Cd diffusion through the growing CdS shell localizes the reaction front at the outermost CdS/S interface, leading to hollow particles when all the Cd is consumed. When we examine partially reacted particles, we find that this system differs significantly from others in which the nanoscale Kirkendall effect has been used to create hollow particles. In previously reported systems, partial reaction creates a hollow particle with a spherically symmetric metal core connected to the outer shell by filaments. In contrast, here we obtain a lower symmetry structure, in which the unreacted metal core and the coalesced vacancies separate into two distinct spherical caps, minimizing the metal/void interface. This pattern of void coalescence is likely to occur in situations where the metal/vacancy self-diffusivities in the core are greater than the diffusivity of the cations through the shell.
Editor: United States: American Chemical Society
Idioma: Inglês

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Sulfidation of Cadmium at the Nanoscale

Cabot, Andreu ; Smith, Rachel K ; Yin, Yadong ; Zheng, Haimei ; Reinhard, Björn M ; Liu, Haitao ; Alivisatos, A. Paul

United States: American Chemical Society

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