| 潘晓悦,李静.二氧化钒相变材料制备的影响因素研究[J].有色金属材料与工程,2026,47(2):1-8. |
| 二氧化钒相变材料制备的影响因素研究 |
| Study of influence factors on the preparation of vanadium dioxide phase change materials |
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| DOI：10.13258/j.cnki.nmme.20250226001 |
| 中文关键词: VO2(M) 水热法 还原剂 相变材料 |
| 英文关键词:VO2(M) hydrothermal method reducing agents phase-change materials |
| 基金项目:上海市科学技术委员会科研计划项目（17511101603） |
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| 中文摘要: |
| 通过水热法制备的二氧化钒（VO2）相变材料，由于其独特的温度调控金属-半导体相变特性，具有广泛的应用前景。研究以偏钒酸铵（NH4VO3）为前驱体，水为溶剂，选用不同的还原剂制备样品。草酸（H2C2O4）与NH4VO3反应，成功制备出目标产物VO2(M)（M表示单斜相P21/c）。研究发现：通过调整前驱体的物质的量浓度及溶液 pH，溶液 pH 越小，虽然产量有所增大，但样品的粒径也随之变大。此外，随着pH的降低，样品表面逐渐变得粗糙；且在生成VO2的同时，伴随有其他钒氧化物的生成。研究表明，当溶液的pH＞0.8时，生成的产物主要为VO2(M)；而当pH＜0.8时，则会生成V6O13、V3O7、V4O7以及V2O5等杂相。 |
| 英文摘要: |
| The vanadium dioxide (VO2). phase-change materials exhibit promising application prospects owing to their unique temperature-controlled metal-semiconductor phase transition behavior. In this work, VO2 phase-change materials were prepared via the hydrothermal method with ammonium metavanadate (NH4VO3) as the precursor and water as the solvent, and different reducing agents were adopted to fabricate the samples. The target product VO2(M) (M represents the monoclinic phase P21/c) was successfully synthesized via the reaction between oxalic acid (H2C2O4) and NH4VO3. It is found that by adjusting the molar concentration of the precursor and the solution pH, a lower pH not only increases the product yield but also results in a larger particle size of the samples. Moreover, the sample surface gradually becomes rough with decreasing pH, accompanied by the formation of other vanadium oxides during the generation of VO2. The results demonstrate that the product is dominated by VO2(M) when the solution pH is higher than 0.8, whereas miscellaneous phases including V6O13, V3O7, V4O7 and V2O5 are formed at pH below 0.8. |
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