Synthesis of Potassium Trimolybdate Ultralong Nanowires via the Molten Salt Method and Investigation of Their Growth Mechanism
In this paper,potassium trimolybdate nanowires are successfully prepared via molten salt method using LiNO3-NaNO3-KNO3 as reaction media and molybdenum trioxide as the starting material.The effects of reaction temperature,concentration of reactants and washing process on the morphology of potassium trimolybdate are investigated.The structure and morphology of the as-prepared products are characterized by X-ray diffraction,scanning electron microscopy and transmission electron microscopy.The results demonstrate that potassium trimolybdate nanowires with a diameter of around 200nm and an aspect ratio of more than 2000 can be obtained at 410 ℃ for 40 minutes and then rinsed with 50％ethanol ice aqueous solution.,Molybdenum trioxide can not react with LiNO3-NaNO3-KNO3 molten salts,when the reaction temperature is less than 160 ℃.Above 170 ℃,however,the potassium trimolybdate nanowires begin to precipitate.The EDS analysis indicates that the as-prepared potassium trimolybdate nanowires follow the dissolution-precipitation reaction mechanism.During the cooling process,the dissolved molybdenum ions are gradually supersaturated and precipitated,and then react with the potassium ions in the molten salt to form a one-dimensional structure of potassium trimolybdate.
potassium trimolybdatenanowiresmolten salt methoddissolution-precipitation mechanismmolybdenum trioxide
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