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The results presented in this study demonstrate that the successive ionic layer deposition (SILD) method for gold nanoparticle formation can be used for surface functionalization of SnO2 films to improve their gas sensing properties. As a result of successive treatments in HAuCl4·nH2O and NaBH4 solutions, gold nanoparticles can be formed on the surface of SnO2 crystallites. The size of the gold particles...
•Gold nanoparticles (AuNPs) possess unusual catalytic activity.•Enhanced catalytic activity of AuNPs is possible only in specific conditions.•The size, the state of gold, and properties of support control reactivity of AuNPs.•New approaches to the formation and stabilization of AuNPs are required.
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