Effect of Mineralizer Concentration on Zno Crystals Synthesized by Hydrothermal Method

摘要

In this paper, the ZnO crystal was synthesized using hydrothermal method through 24 hours' reaction with 35 % filling factor at 430°C. When the mineralizer concentration is rather low (eg. lmol/L NaOH), only ZnO microcrystal is produced. The mineralizer concentration increases, the larger crystal was present. When 5 mol/L NaOH served as mineralizer, the extent of the synthesized crystal was nearly 500 μm. The ZnO cryslals with length of 1500μ m were present when 3ml/L KOH served as mineralizer. Respectively when 3mol/L NaOH and lmol/L KBr were used as mineralizer, the extent of the synthesized crystal was nearly 700 μm , the diameter was 200 μm and the exposedfaces m { 10 1 0}, p { 10 1 1 } was complete , so we obtained the higher quality crystals. Besides the larger crystal, a great deal of microcrystal and nanocrystallites cluster was also present in the product.