论文标题
高熵合金纳米颗粒装饰，P型2D-螺旋二硫化物（MOS2）和金肖特基连接增强了氢感测
High Entropy Alloy Nanoparticles Decorated, p-type 2D-Molybdenum Disulphide (MoS2) and Gold Schottky Junction Enhanced Hydrogen Sensing
论文作者
论文摘要
钼二硫化物（MOS2）是一种有趣的材料，存在于原子薄的多层中，可以被剥落成单层或几层用于多种应用。它已成为开发这种高效传感器的有希望的材料。在这里，我们使用便捷和可伸缩的冷冻量技术，使用新颖的单相高熵合金（HEA）纳米颗粒去除和装饰MOS2片，然后使用声学方法。发现HEA纳米颗粒的装饰赋予了表面增强的拉曼散射效果，并减少了材料的功能从4.9 eV到4.75 eV，如紫外光电子光谱测量。工作功能的这种变化导致金色接触与装饰的MOS2薄片之间的schottky屏障，这是由于表面化学非化学计量学的急剧变化而导致的。在30至100 OC的温度下研究了对氢气的反应，并且由于表面吸附的氧气而显示出异常的P型性质。 HEA和MOS2之间形成的纳米级连接在80 OC时对氢气的反应增加了10倍。通过DFT模拟，进一步解释了实验观察结果，表明在装饰MOS2上更有利的氢吸附，从而增强了响应。
Molybdenum Disulphide (MoS2) is an interesting material which exists in atomically thin multilayers and can be exfoliated into monolayer or a few layers for multiple applications. It has emerged as a promising material for development of such efficient sensors. Here, we have exfoliated and decorated MoS2 flakes with novel, single phase High Entropy Alloy (HEA) nanoparticles using facile and scalable cryomilling technique, followed by sonochemical method. It is found that the decoration of HEA nanoparticles impart surface enhanced Raman scattering effect and reduction in the work function of the material from 4.9 to 4.75 eV as measured by UV photoelectron spectroscopy. This change in the work function results in a schottky barrier between the gold contact and HEA decorated MoS2 flakes as a result of drastic changes in the surface chemical non-stoichiometry. The response to hydrogen gas is studied at temperatures 30 to 100 oC and it shows unusual p-type nature due to surface adsorbed oxygen species. The nanoscale junction formed between HEA and MoS2 shows 10 times increase in the response towards hydrogen gas at 80 oC. The experimental observations are further explained with DFT simulation showing more favourable hydrogen adsorption on HEA decorated MoS2 resulting for enhanced response.
