4 May 2012 Electron spin resonance characterization of defects in sensor materials based on nanocrystalline tin dioxide
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Abstract
Nanocrystalline gas sensitive materials based on tin dioxide modified by Pd or Ru were synthesized and their interaction with CO and ammonia studied by means of in situ DC-conductivity measurements and ex situ ESR spectroscopy. Modification by Pd yields the material highly sensitive to CO in low temperature region, while Ru-modified SnO2 is outstandingly sensitive to NH3 at raised temperature. The materials have well detectable sensitivity to these gases on the concentration level of ambient air standards. We have detected that O2- and OH• radicals are the main type of spin centers in unmodified nanocrystalline tin dioxide. The modifying of tin dioxide by Pd and Ru is accompanied by formation of new spin centers in the samples: Pd+3 and Ru+3. The concentration of these paramagnetic species on the materials interacting with CO and ammonia gases decreased because of their transition to the diamagnetic state Pd+2, Pd0 and Ru+4, respectively.
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D. A. Grishina, D. A. Grishina, A. A. Mironov, A. A. Mironov, I. S. Pentegov, I. S. Pentegov, A. V. Marikutsa, A. V. Marikutsa, E. A. Konstantinova, E. A. Konstantinova, } "Electron spin resonance characterization of defects in sensor materials based on nanocrystalline tin dioxide", Proc. SPIE 8430, Optical Micro- and Nanometrology IV, 84300A (4 May 2012); doi: 10.1117/12.923460; https://doi.org/10.1117/12.923460
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