Dear Md. Nasrul Haque,

In our sol-gel prepared ZnO films, the zero-gel consists of zinc acetate dehydrate

dissolved in ethanol (analytical grade) and is applied on the substrate

either by drop-casting or spin-coating depending on the

application selected. Depending on the type of the substrate the

number of applications may vary and can range from 3 to 10 times.

The samples are then annealed in the presence of atmospheric air

at temperatures over 250 C for the Zn acetate particles spread on

the substrate to calcinate into ZnO. The concentration of the zerogel

and the duration of the annealing are critical for the size of the

resulting nanostructures. In brief,

the samples were suspended in aqueous equimolar solutions of

zinc nitrate hexahydrate [Zn(NO3)26H2O] and hexamine (HMTA)

at 87 C, while the concentration of the nutrients and the duration

of the hydrothermal growth were selected based on the targeted

geometrical characteristics of the nanostructured layers. Zinc acetate

dehydrate and Zinc nitrate hexahydrate were purchased from

Sigma–Aldrich and HMTA from Panreac and all were used without

further purification.

Thank you dear Maria.

In addition, you can use isopropanol, 2-methoxyethanol (instead of ethanol) and monoetanolamina (instead of HMTA) as stabilizer agent.