You can use "flame spray pyrolysis". Search for "Harvard Versatile Engineering Nanomaterials Generation System (VENGES)" for more information.
A simple, cheap and versatile method is the "nitrate route" you can mill the nano-SiO2 in alcohol together with the solution of a zinc salt e.g. a nitrate. Then evaporate the solvent at 80°C, dry and calcine the powder a a temperature high enough to decompose the zinc salt to oxide. All you need is a magnetic stirrer a glass beaker, a PE flask and a furnace which can be heated to ~ 600°C.
Depending on your skills and the ZnO content you will end up with a more or less agglomerated powder which has to be milled.
I have no experience with this specific system; in case of nanozirconia coated with rare earth oxides (1-12 mol-%) by this method the dispersion really adheres well to the substrate and does survive the milling without being abraded.
Thank you so much for your valuable suggestion Dr Frank Kern. Which alcohol ,i will take. Ethanol will be ok?
Thank you very much Dr Sinan Ozgun. but i want SiO2@ZnO not ZnO@SiO2. This paper suggest about silica coating on ZnO NRs. i want ZnO NPs coating on Silica Spheres Nps( 200nm)
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