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Aerosol synthesis of fine particles and films

 

Tremendous technological and scientific trend in Material science for miniaturization and microstructure refinement is basically followed with the increasing interest for nanophase characterization and understanding. The key points important for the future research and development of nanophased materials represent the ability for further improvement of material properties through nanostructuring and fundamental research of structure-properties relationship, from one side, as well as development of assigned and controlled synthesis route with the ability to ensure nanophase synthesis in a controlled manner, from another. Synthesis of submicronic and nanosized powders and thin films represent an area of increasingly high interest and offers new opportunities in materials engineering nevertheless either one component or multicomponent systems are considered.

The programme of controlled and sophisticated powders and films synthesis has been realized at the Institute of Technical Sciences of SASA since past decade. In the framework of this research, the method of aerosol synthesis of nanophased powders and films is developed together with the experimental set-up using either twin-fluid or ultrasonic (800kHz, 1.3, 1.7 and 2.5 MHz) atomizers. Moreover, a Pyrosol technique for thin film synthesis through aerosols is developed, too, the methods of Electrospray aerosol synthesis route, that generates monodisperse aerosols, as well as Scanning Mobility Particle Sizer, for in-situ determination of the size distribution and concentration of aerosols in the range from 5-1000nm, are setting-up. Based on these techniques, the synthesis of fine, spherical, submicronic powders as well as thin films, either in crystal or amorphous state based on oxides, metals and non-oxides were developed. Those materials are applicable for electronics, optoelectronics, engineering ceramics, catalysts, biomaterials etc.

Developing and owning these technologies, that belong to the group of nanotechnologies, makes the ITS of SASA unique in the country and classifies into the group of leading research centres in the world that own similar methods.

Aparatura za dobijanje submikronskih cestica i tankih filmova

Aerosol synthesis route is based on the formation of aerosols of precursor solutions ultrasonically and control over the aerosol decomposition in a high temperature tubular flow reactions through the successive processes of droplet evaporation, drying, solute precipitation and decomposition. Since the heterogeneous gas/liquid-solid reaction occurs in a dispersed system-aerosol at the level of few micrometers sized droplets, compositional segregation is prevented and high heating rates (20-300 K/s), as well as high surface reaction could be achieved.

Electrospray aerosol synthesis route enables monodisperse aerosol generation of particles in range of 2-100nm and concentration of up to 10 7 particles per cm 3

Advantages of aerosol sinthesis

in production of powders

  • simple method for production of oxide, non-oxide, metal and composite powders of complex composition
  • solution chemistry approaches offer design of materials at the molecular level
  • spherical morphology with full or hollow spheres
  • narrow particle size distribution
  • very homogeneous composition
  • amorphous and nanostructured powders
  • mono- and poly-dispersive particles
  • ecologically friendly materials and technologies

in production of films

  • easy control of deposition rate and film thickness
  • no limits concerning dimensions and shape of substrate
  • simple doping of films using any element and in any proportion by addition of a suitable dopant into the starting solution
  • possible production of layered films and films with concentration gradient
  • vacuum not required in any step of the process

Using our pilot setup, oxide (ZnO, ZnO-Pt(IV), ZnO-Ru(III), Y 3 Al 5 O 12 :Ce, Gd 2 O 3 :Eu, NiO, SnO 2 , TiO 2 , TiO 2 -Pt, SiO 2 , Al 2 O 3 , MgO, Co 3 O 4 , BaTiO 3 , LiMn 2 O 4 , ZnO varistor, mulite, cordierite, spinel, hydroxyapatite, high-temperature oxide super-conductor and nanocomposites like Ag:(Bi,Pb)-2223) powders, metal (Ni, Ni-Pd, Ni-Cu, LaNi 5 , NiAl) and carbide (SiC) powders have been synthesized from different precursor solutions by ultrasonic and twin-fluid spray pyrolysis. Also, various thin films have been made by this procedure. Any powder or thin film of controlled structure order can be obtained by this method.

morfologija filma
morfologija filma
   
morfologija filma
morfologija filma

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