Abstract Molten-salt synthesis (MSS) method becomes an excellent bottom-up synthesis technique of nanomaterials with various chemical compositions and morphologies because of its meritorious features including environmental friendliness, low cost, simple to operate, easy to scale-up, etc. This review article highlights the status, potential and challenges of MSS for the synthesis of metal oxide nanomaterials. It gives a concise flavour on the importance of synthesis on the properties and application of nanomaterials. We have compiled a brief write-up on a few frequently used synthesis methods and their advantages and disadvantages. This review article encompasses different aspects of MSS such as the role of molten salt, the choice of molten salt, the effect of various synthesis parameters, typical oxosalts and their electrochemical aspects. Some advanced modifications of the MSS method and their implications are also discussed in brief citing a few examples. For readers to have a completed understanding and feel of MSS, both pros and cons of it have been discussed as well. The recent progress in MSS of inorganic metal oxide nanoparticles is reviewed in this article. We start with simple binary oxides and then explain a few technologically important cases of complex metal oxide nanomaterials. This review article also highlights how the MSS method has been successful in synthesizing ABO2 delafossite, ABO3 perovskite, AB2O4 spinel and A2B2O7 pyrochlore nanomaterials. This review article opens a new avenue for exploring MSS in making size and shape tunable nanomaterials for various catalytic, optoelectronic, magnetic, and electrical applications.

中文翻译：

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金属氧化物纳米材料的熔盐合成：现状、机遇与挑战

摘要 熔盐合成（MSS）法具有环境友好、成本低、操作简单、易于放大等优点，成为一种优良的自下而上合成各种化学成分和形貌纳米材料的技术。综述文章重点介绍了 MSS 在合成金属氧化物纳米材料方面的现状、潜力和挑战。它简明扼要地说明了合成对纳米材料的性质和应用的重要性。我们对一些常用的合成方法及其优缺点进行了简要介绍。这篇综述文章涵盖了 MSS 的不同方面，例如熔盐的作用、熔盐的选择、各种合成参数的影响、典型的草酸盐及其电化学方面。还简要讨论了 MSS 方法的一些高级修改及其含义，并引用了一些示例。为了让读者对MSS有一个完整的理解和感受，它的优缺点也已经讨论过了。本文综述了无机金属氧化物纳米粒子 MSS 的最新进展。我们从简单的二元氧化物开始，然后解释复杂金属氧化物纳米材料的一些技术上重要的案例。这篇评论文章还重点介绍了 MSS 方法如何成功地合成 ABO2 铜铁矿、ABO3 钙钛矿、AB2O4 尖晶石和 A2B2O7 烧绿石纳米材料。这篇综述文章为探索 MSS 在制造用于各种催化、光电、磁和电应用的尺寸和形状可调的纳米材料方面开辟了一条新途径。