Synthesis and preservation of graphene-supported uranium dioxide nanocrystals
Synthesis and preservation of graphene-supported uranium dioxide nanocrystals
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DOI：
10.1016/j.jnucmat.2016.03.027
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发表时间：
2016-07
影响因子：
3.1
通讯作者：
Hanyu Ma;Haitao Wang;P. Burns;B. McNamara;E. Buck;Chongzheng Na
中科院分区：
文献类型：
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作者：
Hanyu Ma;Haitao Wang;P. Burns;B. McNamara;E. Buck;Chongzheng Na
石墨烯支撑的二氧化铀（UO2）纳米晶体是潜在的重要燃料材料。在这里，我们研究了通过沸腾回流下乙酰丙酮双氧铀的多元醇还原在极性乙二醇化合物中合成石墨烯负载的UO2纳米晶体的可能性，从而能够将廉价的石墨烯前体氧化石墨烯用于一锅法。我们表明，与单乙二醇、二甘醇和聚乙二醇相比，三甘醇是最合适的溶剂，具有适当的还原潜力，可用于生产纳米尺寸的 UO2 晶体。用三甘醇合成的石墨烯支撑的 UO2 纳米晶体显示出异质外延的证据，这有利于促进核燃料颗粒的传热。此外，我们还表明，通过多元醇还原合成的石墨烯支撑的 UO2 纳米晶体可以很容易地储存在醇中，从而阻止空气中普遍存在的氧气的氧化。总之，这些方法为制备和储存石墨烯支撑的 UO2 纳米晶体提供了一种简便的方法，以便在环境条件下进一步研究和开发。
Graphene-supported uranium dioxide (UO2) nanocrystals are potentially important fuel materials. Here, we investigate the possibility of synthesizing graphene-supported UO2nanocrystals in polar ethylene glycol compounds by the polyol reduction of uranyl acetylacetone under boiling reflux, thereby enabling the use of an inexpensive graphene precursor graphene oxide into a one-pot process. We show that triethylene glycol is the most suitable solvent with an appropriate reduction potential for producing nanometer-sized UO2crystals compared to monoethylene glycol, diethylene glycol, and polyethylene glycol. Graphene-supported UO2nanocrystals synthesized with triethylene glycol show evidence of heteroepitaxy, which can be beneficial for facilitating heat transfer in nuclear fuel particles. Furthermore, we show that graphene-supported UO2nanocrystals synthesized by polyol reduction can be readily stored in alcohols, impeding oxidation from the prevalent oxygen in air. Together, these methods provide a facile approach for preparing and storing graphene-supported UO2nanocrystals for further investigation and development under ambient conditions.