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Please use this identifier to cite or link to this item: http://acervodigital.unesp.br/handle/11449/10120
Title: 
Morphological evolution of tin oxide nanobelts after phase transition
Author(s): 
Institution: 
  • Universidade Estadual Paulista (UNESP)
  • Lab Nacl Luz Sincrotron
  • Universidade Federal de São Carlos (UFSCar)
ISSN: 
1528-7483
Abstract: 
This article reports a study of the thermal stability and morphological changes in tin oxide nanobelts grown in the orthorhombic SnO phase. The nanobelts were heat-treated in a differential scanning calorimetry (DSC) furnace at 800 degrees C for I It in argon, oxygen, or synthetic air atmospheres. The samples were then characterized by DSC, X-ray diffraction (XRD), high resolution transmission electron microscopy (HRTEM), and high resolution field emission scanning electron microscopy (FE-SEM). The results confirmed that the orthorhombic SnO phase is thermodynamically unstable, causing the belts to transform into the SnO2 phase when heat-treated. During the phase transition, if oxygen is available in the furnace atmosphere, nanofibers grow at the edge of nanobelts at about 50 degrees of the belts' growth direction, while particles grow on the belt surface in the absence of oxygen. Although the decomposition process reduces the nanobelt cell volume by 22%, most belts remain monocrystalline after the heat treatment. The results confirm that phase transition is a decomposition process, which explains the morphological changes in the belts based on metallic tin generated in the process.
Issue Date: 
1-Mar-2008
Citation: 
Crystal Growth & Design. Washington: Amer Chemical Soc, v. 8, n. 3, p. 1067-1072, 2008.
Time Duration: 
1067-1072
Publisher: 
Amer Chemical Soc
Source: 
http://dx.doi.org/10.1021/cg7009379
URI: 
Access Rights: 
Acesso restrito
Type: 
outro
Source:
http://repositorio.unesp.br/handle/11449/10120
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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