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Insight into the Role of Oxygen Diffusion in the Sensing Mechanisms of SnO 2 Nanowires
Author(s) -
HernandezRamirez Francisco,
Prades Joan Daniel,
Tarancon Albert,
Barth Sven,
Casals Olga,
JimenezDiaz Roman,
Pellicer Eva,
Rodriguez Jordi,
Morante Joan Ramon,
Juli Miguel Angel,
Mathur Sanjay,
RomanoRodriguez Albert
Publication year - 2008
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.200701191
Subject(s) - nanowire , materials science , partial pressure , oxygen , diffusion , oxide , chemical physics , characterization (materials science) , nanotechnology , metal , thermodynamics , metallurgy , chemistry , physics , organic chemistry
The role of oxygen diffusion in the response of individual SnO 2 nanowires to this gas is studied. Different oxygen partial pressures lead to strong changes of their electrical resistance, even at room temperature. Since surface models fail to explain the experimentally observed long‐term resistance transients, it is necessary to make a description of the interaction mechanisms between oxygen species and SnO 2 nanowires by taking ion diffusion into account. Our model correctly describes the experimentally measured dependence of the nanowire resistance with oxygen partial pressure, and it can be applied to the characterization of other metal oxide materials.