AI Article Synopsis
- The study investigates how nitrogen monoxide (NO) interacts with nanosized Ru(Pd,Pt)-doped SnO(2) using various measurement techniques.
- Three key reaction steps are identified: forming oxygen vacancies in the semiconductor, single-ionizing these vacancies to inject electrons, and transferring electrons to the metal dopants.
- This electron transfer leads to more oxygen vacancies and reduces the transition metals' oxidation states, which significantly alters the electrical resistance compared to undoped SnO(2).
Article Abstract
The mechanism of NO interaction with nanosized Ru(Pd,Pt)-doped SnO(2) was studied by electron paramagnetic resonance, Mössbauer, and electric resistance measurements. Three steps were proposed for the reaction between the semiconductor oxide and the gaseous component: (i) the formation of bielectronic oxygen vacancies (V(o)) in SnO(2); (ii) their single-ionization (V(o)(*)) with injection of electrons into the SnO(2) conduction band; (iii) the subsequent transfer of electrons from V(o)(*) to [Ru(Pd,Pt)](4+). The last process induces the formation of further oxygen vacancies which reduce the transition metal centers to lower oxidation states; the redox processes is enhanced and the electrical resistance in transition metal-doped SnO(2) is stronger modified with respect to the undoped material.
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| http://dx.doi.org/10.1021/jp040740k | DOI Listing |
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