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The model has been applied to explain the behavior of resistance in vacuum of two sets of nanostructured thick\u2010films with grains having two well\u2010distinct characteristic radii (<jats:italic>R<\/jats:italic> = 25\u2009nm and <jats:italic>R<\/jats:italic> = 125\u2009nm). In the first case the grain radius is shorter than the depletion region width, a limit at which overlapping of barriers takes place, and in the second case it is longer. The behavior of resistance in the presence of dry air has been explained through the mechanism of barrier modulation through gas chemisorption.<\/jats:p>","DOI":"10.1155\/2009\/402527","type":"journal-article","created":{"date-parts":[[2009,8,30]],"date-time":"2009-08-30T13:00:17Z","timestamp":1251637217000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Field\u2010Assisted and Thermionic Contributions to Conductance in SnO<sub>2<\/sub> Thick\u2010Films"],"prefix":"10.1155","volume":"2009","author":[{"given":"C.","family":"Malag\u00f9","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"M. C.","family":"Carotta","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"G.","family":"Martinelli","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"M. 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