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Utilize este identificador para citar ou criar um link para este item: http://acervodigital.unesp.br/handle/11449/111787
Título: 
Prediction of dopant atom distribution on nanocrystals using thermodynamic arguments
Autor(es): 
Instituição: 
  • Brazilian Nanotechnol Natl Lab
  • Forschungszentrum Julich
  • Universidade Estadual de Campinas (UNICAMP)
  • Universidade Estadual Paulista (UNESP)
  • Universidade Federal de São Carlos (UFSCar)
ISSN: 
1463-9076
Resumo: 
A theoretical approach aiming at the prediction of segregation of dopant atoms on nanocrystalline systems is discussed here. It considers the free energy minimization argument in order to provide the most likely dopant distribution as a function of the total doping level. For this, it requires as input (i) a fixed polyhedral geometry with defined facets, and (ii) a set of functions that describe the surface energy as a function of dopant content for different crystallographic planes. Two Sb-doped SnO2 nanocrystalline systems with different morphology and dopant content were selected as a case study, and the calculation of the dopant distributions expected for them is presented in detail. The obtained results were compared to previously reported characterization of this system by a combination of HRTEM and surface energy calculations, and both methods are shown to be equivalent. Considering its application pre-requisites, the present theoretical approach can provide a first estimation of doping atom distribution for a wide range of nanocrystalline systems. We expect that its use will support the reduction of experimental effort for the characterization of doped nanocrystals, and also provide a solution to the characterization of systems where even state-of-art analytical techniques are limited.
Data de publicação: 
1-Jan-2014
Citação: 
Physical Chemistry Chemical Physics. Cambridge: Royal Soc Chemistry, v. 16, n. 3, p. 1089-1094, 2014.
Duração: 
1089-1094
Publicador: 
Royal Soc Chemistry
Fonte: 
http://dx.doi.org/10.1039/c3cp53427h
Endereço permanente: 
Direitos de acesso: 
Acesso restrito
Tipo: 
outro
Fonte completa:
http://repositorio.unesp.br/handle/11449/111787
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