The effect of synthesis temperature, pH condition, poly (vinyl alcohol) (PVA) addition and post synthesis treatment by H
2O
2 on the crystal phase and their electrical resistivity of the powder prepared through the hydrolysis reaction of tin chloride was investigated. A powder that has strong X-ray diffraction (XRD) pattern which corresponds to periodic layered structure and weak Sn
3O
2(OH)
2 signals were obtained when the synthesis condition was controlled to 90℃ and pH=2.4~4.2 with PVA addition. The XRD peak intensity of the layered structure drastically reduced when PVA was not added or the synthesis temperature was below 50℃. It was also found that the Sn
3O
2(OH)
2 phase could be transferred to SnO
2-x when the additive content of H
2O
2 was nearly equivalent to Sn content. Among samples prepared under various pH values and temperatures, it was confirmed that the composite samples with stronger XRD diffraction signals from periodic layered structure possesses lower resistivity.
View full abstract