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Korotcenkov, Ghenadii,Gulina, Larisa B.,Cho, Beongki,Brinzari, Vladimir,Tolstoy, Valery P. International Union of Pure and Applied Chemistry 2014 Pure and Applied Chemistry Vol. No.
<P><B>Abstract</B></P><P>The ability of successive ionic layer deposition (SILD) technology to synthesize gold clusters on the surface of tin(IV) oxide and indium(III) oxide films is discussed. It was shown that during the process, concentration of active sites that are capable of absorbing gold ions, and the size of the gold particles thus formed, may be controlled by both concentration of the solutions used and the number of SILD cycles. Thus, SILD methodology, employing separate and multiple stages of adsorption and reduction of adsorbed species, has considerable potential for customizing the properties of the deposited metal nanoparticles. In particular, it is shown that during the deposition of gold nanoparticles on the surface of tin(IV) oxide and indium(III) oxide films by SILD methodology, conditions can be realized under which the size of gold nanoclusters may be controllably varied between 1-3 nm and 50 nm. A model is proposed for the formation of gold clusters during the SILD process.</P>
Korotcenkov, G.,Brinzari, V.,Cho, B.K. Trans Tech Publications, Ltd. 2015 Applied Mechanics and Materials Vol. No.
<P>In this report it is being discussed approaches for designing the SnO2 and In2O3 ozone sensors based on the film parameters optimization. It was considered the influence of the conditions of the SnO2 and In2O3 films deposition by spray pyrolysis method and the parameters of those films on operating characteristics of ozone sensors. Main factors, controlling operating characteristics of thin film ozone sensors were determined. Recommendations to process of the SnO2 and In2O3 films deposition, promoting an attainment of optimal operating gas sensing properties, were formulated.</P>
Korotcenkov, G.,Cho, B.K.,Nazarov, M.,Noh, D.Y.,Kolesnikova, E.V. Elsevier 2010 CURRENT APPLIED PHYSICS Vol.10 No.4
Un-doped and (Cu, Fe, and Co)-doped SnO<SUB>2</SUB> were studied using films deposited by spray pyrolysis. Room temperature cathodoluminescence (CL) was measured. Differences in CL spectra were observed as a function of deposition parameters (T<SUB>sub</SUB>-350-550<SUP>o</SUP>C), the nature and concentration of dopants (0-16at.%), and the resulting high annealing temperature (T<SUB>an</SUB>=700-950<SUP>o</SUP>C). A possible luminescence mechanism has been discussed. It was established that changes taking place in CL spectra were caused by the change of both the grain size and crystallinity (stoichiometry) of the surface layer. It was concluded that radiative recombination occurs through shallow donor levels associated with O-vacancies and trapped centers. It was assumed that in SnO<SUB>2</SUB> there are apparently three types of defects forming deep levels located at 0.8-0.9, 1.3-1.4, and ~1.6eV from the top of the valence band.
Korotcenkov, G.,Han, S. -D.,Cho, B. K.,Brinzari, V. Taylor Francis 2009 CRITICAL REVIEWS IN SOLID STATE AND MATERIALS SCIE Vol.34 No.1
<P> Based on the experimental results, obtained by studying both structural and gas-sensing properties of the SnO2 and In2O3 films deposited by the spray pyrolysis method, we analyzed the influence of crystallite size on the parameters of the SnO2- and In2O3-based thin film solid-state gas sensors. For comparison, the behavior of ceramic-type gas sensors was considered as well. In particular, we examined the correlation between the grain size and parameters of conductometric-type gas sensors such as the magnitude of sensor signal, the rate of sensor response, thermal stability, and the sensitivity of sensor signal to air humidity. Findings confirmed that that grain size is one of the most important parameters of metal oxides, controlling almost all operating characteristics of the solid state gas sensors fabricated using both the ceramic and thin film technologies. However, it was shown that there is no single universal requirement for the grain size, because changes in grain size could either improve, or worsen of operating characteristics of gas sensors. Therefore, the choice of optimal grain size should be based on the detailed consideration of all possible consequences of their influence on the parameters of sensors designed.</P>
SnO<sub>2</sub> Films Decorated by Au Clusters and their Gas Sensing Properties
Korotcenkov, Ghenadii,Brinzari, Vladimir,Han, S.H.,Gulina, L.B.,Tolstoy, V.P.,Cho, B.K. Trans Tech Publications, Ltd. 2015 Materials science forum Vol.827 No.-
<P>It is shown that successive ionic layer deposition (SILD) method can be used for a surface functionalizing of the SnO2 films and improving their gas sensing properties. It was found that gold clusters deposited on the SnO2 surface were active to both reducing and oxidizing gases. However, the most significant increase in the conductivity response was observed during detection of ozone. It was established that the effect of the SnO2 surface decoration by AuNPs on gas sensing characteristics depends on the number of deposition cycles, i.e. the size of gold clusters. Moreover, there is an optimal level of surface doping, and it corresponds to a very small degree of the surface coverage by gold. Models showing the promotional role of Au additives were then discussed, and the mechanism of sensitization in the SnO2:Au-based gas sensor are proposed.</P>
Korotcenkov, G.,Cho, B.K.,Brinzari, V.,Gulina, L.B.,Tolstoy, V.P. Taylor Francis 2014 Ferroelectrics Vol.459 No.-
<P>Research has shown that successive ionic layer deposition (SILD) technology can be used for improvement operating characteristics of solid state conductometric gas sensors. This technology gives possibility to deposit nanolayers of noble metals such as Pd, Ag, SnO2-Au nanocomposites, and oxides of transition metals such as Cu, Fe, Mn, Co, which can play the role of catalytically active filters for ozone.</P>