Formation of metal nanoparticles on nonmetal substrates for heterogeneous nanocatalysts

Abstract

In the present study the methods of synthesis and characterization of metal nanoparticles structures of a given size and surface topology on the non-metallic surfaces are described. The main application of such particles can be selective heterogeneous catalysis of chemical reactions or their usage as nucleus of growth centers for different nanostructures (tubes, whiskers, etc.). The formation of nanoparticles systems on the surface was carried out by two ways: by "thin cutoff plate" method and by vacuum annealing of ultrathin solid films. Metal was deposited on the substrate by thermal evaporation (deposition) in vacuum. Studies of the samples were carried out using the methods of Auger analysis and scanning electron microscopy. AES detects intense peaks of deposited metals with weak tungsten (the evaporator material), oxygen, carbon and the substrate material elements peaks in chemical composition of the films. The SEM studies reveal the presence of well-defined islet metallic structures on the samples obtained by both methods. For vacuum annealing method a clear correlation between annealing and obtained structures parameters is demonstrated. При цитуванні документа, використовуйте посилання http://essuir.sumdu.edu.ua/handle/123456789/20565

In the present study the methods of synthesis and characterization of metal nanoparticles structures of a given size and surface topology on the non-metallic surfaces are described. The main application of such particles can be selective heterogeneous catalysis of chemical reactions or their usage as nucleus of growth centers for different nanostructures (tubes, whiskers, etc.). The formation of nanoparticles systems on the surface was carried out by two ways: by "thin cutoff plate" method and by vacuum annealing of ultrathin solid films. Metal was deposited on the substrate by thermal evaporation (deposition) in vacuum. Studies of the samples were carried out using the methods of Auger analysis and scanning electron microscopy. AES detects intense peaks of deposited metals with weak tungsten (the evaporator material), oxygen, carbon and the substrate material elements peaks in chemical composition of the films. The SEM studies reveal the presence of well-defined islet metallic structures on the samples obtained by both methods. For vacuum annealing method a clear correlation between annealing and obtained structures parameters is demonstrated. При цитировании документа, используйте ссылку http://essuir.sumdu.edu.ua/handle/123456789/20565