I want to fabricate smooth ZnO nano-particles (less than 5 nm) thin film without annealing
Zinc acetate dihydrate (2.95 g, 13.4 mmol) was dissolved in
methanol (125 ml) with stirring at 65 °C . A solution of KOH (1.48 g, 23 mmol) in methanol (65 ml) was then added drop wise at 60–65 °C over a period of 15 min. The reaction mixture was stirred for 2.5 h at 65 °C . After cooling to room temperature, the supernatant was decanted and the precipitate washed twice with methanol (20 ml). n-butanol (70 ml), methanol (5 ml) and chloroform (5 ml) were added to disperse the precipitate and produce a ZnO nanoparticle solution . Before use, the ZnO nanoparticle solution was filtered through a 0.45 mm PVDF syringe filter.
a thin ZnO nanoparticle layer was spin coated onto the substrate at 3,000 r.p.m. for 30 s. The procedure was repeated three times to obtain a continuous smooth film.
The best method to preparation zinc oxide nanoparticles is the ultrasonic spray technique
Comment to the good answer of Rohit Chavan.
If you want to get rid of the acetic acid which bounds to the ZnO surface (compare to the mentioned article (IR data)) it should also be possible to use ZnCl2 (resulting in unmodified particles).
Article Synthesis and testing of ZnO nanoparticles for photo-initiat...
Procedure for particle preparation is one step co-precipitation at room temperature (details might be found in additional publications).
ZnO films can also be deposited by thermal evaporator at low pressures.
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