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Tin Oxides: Insights into Chemical States from a Nanoparticle Study
Lund Univ, Dept Phys, Synchrotron Radiat Res Div, Box 118, S-22100 Lund, Sweden..
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and Condensed Matter Physics.
Lund Univ, MAX Lab, Box 118, S-22100 Lund, Sweden..
Lund Univ, Dept Phys, Synchrotron Radiat Res Div, Box 118, S-22100 Lund, Sweden..
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2017 (English)In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 121, no 35, 19414-19419 p.Article in journal (Refereed) Published
Abstract [en]

Tin oxides are semiconductor materials currently attracting close attention in electronics, photovoltaics, gas sensing, and catalysis. Depending on the tin oxidation state-Sn(IV), Sn(II), or intermediate-the corresponding oxide has either n- or p-type natural conductivity, ascribed to oxygen or metal deficiency in the lattice. Such crystalline imperfections severely complicate the task of establishing tin oxidation state, especially at nanoscale. In spite of the striking differences between SnO2 and SnO in their most fundamental properties, there have been enduring problems in identifying the oxide type. These problems were to a great extent caused by the controversy around the characteristic chemical shift, that is, the difference in electron binding energy of a certain core level in an oxide and its parent metal. Using in situ fabricated bare tin oxide nanoparticles, we have been able to resolve the controversy: Our photoelectron spectroscopic study on tin oxide nanoparticles shows that, in contrast to a common opinion of a close chemical shift for SnO2 and SnO, the shift value for tin(IV) oxide is, in fact, 3 times larger than that for tin(II) oxide. Moreover, our investigation of the nanoparticle valence electronic structure clarifies the question of why previously the identification of oxidation states encountered problems.

Place, publisher, year, edition, pages
2017. Vol. 121, no 35, 19414-19419 p.
National Category
Nano Technology Physical Chemistry
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URN: urn:nbn:se:uu:diva-335205DOI: 10.1021/acs.jpcc.7b05013ISI: 000410597600052OAI: oai:DiVA.org:uu-335205DiVA: diva2:1162452
Available from: 2017-12-04 Created: 2017-12-04 Last updated: 2017-12-04Bibliographically approved

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Zhang, ChaofanBjörneholm, Olle

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