The influence of oxalate on crystal grain growth of nanosized SnO2 |
Paper ID : 1566-UFGNSM-FULL |
Authors: |
Abstract: |
The nanosized SnO2 particles were prepared by chemical precipitation method using ammonium hydroxide and tin dichloride. The obtained SnO2 powders were treated by soaking in the oxalat solution with different concentrations for 24h. The as-prepared powders and the samples treated with oxalat were calcined at 700Ċ . The powders were characterized by X-ray diffraction (XRD), and scanning electron microscopy (SEM) . The results showed that the untreated SnO2 particles in the presence oxalate, the crystal sizes of SnO2 modified by oxalat grew slowly under the same condition. This phenomenon implied that oxalate treatment played an important role in inhibiting the crystal grain growth of SnO2 calcined at high temperature. Some amount of NH3.H2O 2M solution was dropped into SnCl2 in 1-butanol solution while stirring. The precipitation precursor was filtered and washed with distilled water to remove all the Cl ions.Then the precursor was dried in an oven at 60 Ċ for 8h and calcined at 700Ċ for 6h to obtain SnO2 powder.The as-prepared powders were dipped in (NH4)2C2O4 solution with different concentration for 24h. The crystallite size was calculated with the scherrer equation.It is obvious that the crystal sizes of SnO2 grown faster while the crystal sizes of O-SnO2 grow slowly. By comparison , it can be obviously seen that the crystal sizes of O-SnO2 at the same calcination condition were smaller. |
Keywords: |
Nano tin dioxide – ammonium oxalate- Soaking-crystal size |
Status : Paper Accepted (Poster Presentation) |