| Controlled synthesis of mono-dispersed nanoparticles with specific composition,morphology and size has been focusedtheir attentions on by researchers. In view ofthe problems existing in the process of solution combustion synthesis, such as particleaggregation/sintering, irregular morphology and small specific surface area, etc.,controlled fabrication of tin oxide, ceria and zirconium-based nanoparticles viasolution combustion route were studied by introduction of soluble salt in redoxreaction mixture solution combined with microwave-induced combustion. The effectsof salts/fuels sorts, salts/fuels amounts, thermal treatment, and ignition method, etc.on such microstructural properties as the size, morphology, crystallinity, phase,dispersion and specific surface area, etc. as well as the relevant mechanism wereinvestigated to explore a novel route for controlling microstructure.A set of equipment for microwave-induced solution combustion synthesis wasdesigned and patented, which was used to conduct a systematic study on controlledfabrication of Sn1-xRExO2-x/2. The results show that a series of Sn1-xRExO2x/2(RE=Y,La, Gd and Nd) nanorods have been prepared by annealing the as-obtained productsfrom microwave-induced KCl-assisted solution combustion reaction. X-raydiffractometry indicates that KCl-assisted solution combustion leads to the formationof K2SnO3precursor coated by KCl monolayer film. The proper amount of KCl iscrucial to the growth of one-dimensional nanostructure, which can be also under-stood based on oriented attachment by polar force.In the paper, rapid and facile synthesis of a series of Zr1-xCexO2andZr1-xEuxO2-x/2nanparticles were also studied. The results demonstrate that the additionof chloride into reaction mixture results in the drastic increase in specific surface areaof resultants and yield of about5nm well-dispersed nanoparticles. Significantly, thesuspension of Zr0.97Eu0.03O1.985nanoparticles presentintense fluorescence andexcellent dispersion, showing the bright prospectapplied in anti-counterfeitingprinting.In summary, the salted-assisted solution combustion synthesis process is highly efficient, rapid, convenient, suitable for adjusting the particle size, morphology andspecific surface area, and promises of industrialization. |
