Low-temperature growth of ultrathin and epitaxial Mo2C nanosheets via a vapor–liquid–solid process,Nanoscale

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Low-temperature growth of ultrathin and epitaxial Mo2C nanosheets via a vapor–liquid–solid process
Nanoscale ( IF 5.8 ) Pub Date : 2022-06-09 , DOI: 10.1039/d2nr02389j
Bin Wang _{1,

2} , Changbao Zhao ₁ , Chao Wang ₁ , Rongtan Li ₁ , Guohui Zhang ₁ , Rentao Mu ₁ , Qiang Fu ₁

Affiliation

Due to the unique physical and chemical properties, transition metal carbides (TMCs) have many potential applications in the fields of energy conversion and catalysis. Chemical vapor deposition (CVD) is a promising method to synthesize TMCs. However, spatially inhomogeneous supply of transition metal precursor vapor in the normal CVD process generally leads to poor control of the morphology and uniformity of the products. Here, we report a vapor–liquid–solid (VLS) growth process where non-volatile Na₂MoO₄ is used to act as a liquid precursor for the growth of uniform ultrathin Mo₂C nanosheets on Al₂O₃(0001). The morphology of the nanosheets can be controlled by tuning the precursor concentration, annealing time and growth temperature. The roles of Na and the liquid–solid interface in consolidating Mo atoms and promoting the epitaxial growth of Mo₂C nanosheets are demonstrated. Furthermore, we show that the liquid–solid interface can cause the crystalline phase transition of Mo₂C nanosheets through verification experiments.

中文翻译：

通过汽-液-固工艺低温生长超薄和外延 Mo2C 纳米片

由于独特的物理和化学性质，过渡金属碳化物（TMCs）在能量转换和催化领域具有许多潜在的应用。化学气相沉积 (CVD) 是一种很有前途的合成 TMC 的方法。然而，在正常的 CVD 工艺中，过渡金属前体蒸气的空间不均匀供应通常会导致对产品的形态和均匀性的控制不佳。在这里，我们报告了一种气-液-固 (VLS) 生长过程，其中使用非挥发性 Na ₂ MoO ₄作为液体前体，在 Al ₂ O _{3上生长均匀的超薄 Mo}₂ C 纳米片。(0001)。可以通过调整前体浓度、退火时间和生长温度来控制纳米片的形态。展示了Na和液固界面在巩固Mo原子和促进Mo ₂ C纳米片外延生长中的作用。此外，我们通过验证实验表明液固界面可以引起Mo _{2 C纳米片的结晶相变。}

更新日期：2022-06-09

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