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.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.