Research Paper

Journal of Nanoparticle Research

, Volume 11, Issue 7, pp 1767-1775

One-step flame method for the synthesis of coated composite nanoparticles

  • Sowon SheenAffiliated withNational CRI Center for Nano Particle Control, Institute of Advanced Machinery and Design, School of Mechanical and Aerospace Engineering, Seoul National UniversitySamsung Electronics
  • , Sangsun YangAffiliated withNational CRI Center for Nano Particle Control, Institute of Advanced Machinery and Design, School of Mechanical and Aerospace Engineering, Seoul National UniversityNano Functional Materials Group, Department of Powder Materials, Korea Institute of Materials Science
  • , Kimin JunAffiliated withNational CRI Center for Nano Particle Control, Institute of Advanced Machinery and Design, School of Mechanical and Aerospace Engineering, Seoul National University
  • , Mansoo ChoiAffiliated withNational CRI Center for Nano Particle Control, Institute of Advanced Machinery and Design, School of Mechanical and Aerospace Engineering, Seoul National University Email author 

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Abstract

A simple in situ flame coating method has been developed by designing a new type of coflow diffusion flame burner having a sliding unit. The sliding unit was shown to be very effective in finding a right position where the precursor for coating layer should meet with core particles. SiO2-coated TiO2 nanoparticles were first prepared and whether most surfaces of particles were coated was examined by both direct observation of particles through a transmission electron microscope and Zeta potential measurements. Mean core sizes varied from 28 to 109 nm and mean coating thickness was about 2.4 nm for silica-coated titania particles. By simply changing chemical precursors, we demonstrated that SiO2-coated SnO2, SnO2-coated TiO2, SiO2–SnO2-coated TiO2 nanoparticles could be also synthesized.

Keywords

Flame method Aerosol coating Coated particles Composite particles