论文标题
通过一种新型的喷雾技术和浸泡和表面活性剂的重要性对MOS2纳米片的高收益去角质
High-yield exfoliation of MoS2 nanosheets by a novel spray technique and the importance of soaking and surfactants
论文作者
论文摘要
二维材料的液相去角质对大规模应用非常有吸引力。尽管广泛使用，但据报道，具有高效率的MOS2层（<10）非常困难。此外，尚未研究浸泡的重要性，并且表面活性剂在稳定MOS2纳米片中的作用很少了解1。本文中，我们报告了一种新的方法，可以通过高压（HP）液相去角质（LPE）在去离子（DI）水中去角质。从60天浸泡的样品中获得4至7层MOS2纳米片，发现它们在溶剂中稳定，最多六个月。关于三种表面活性剂的作用，即十二烷基苯甲酸钠（SDBS），巧克力酸钠（SC）和四丁基溴溴溴化铵（TBAB），表明SDB中MOS2纳米片在SDB中的剥落比其他两种外表面效果高效。估计的收益率达到7.25％，纳米片浓度为1.45 mg/ml，这是有史以来报告最高的含量之一。我们的研究还表明，纳米片的浓度和横向大小取决于去角质周期，施加的压力和表面活性剂浓度。氢进化反应（HE）和离子 - 转运研究表明，我们方法制备的纳米片在酸性培养基中稳定，无表面活性剂。在环境实验室条件下估计了30.13 mmol G-1 H-1的高氢进化速率。
Liquid-phase exfoliation of two-dimensional materials is very attractive for large-scale applications. Although used extensively, isolating MoS2 layers (<10) with high efficiency is reported to be extremely difficult. Further, the importance of soaking has not yet been studied, and the surfactants' role in stabilizing MoS2 nanosheets is poorly understood1. Herein, we report a novel approach to exfoliating large quantities of MoS2 via high-pressure (HP) liquid-phase exfoliation (LPE) in deionized (DI) water. 4 to 7 layers of MoS2 nanosheets were obtained from 60 days-soaked samples and they were found to be stable in solvents for periods of up to six months. Studies on the effect of three surfactants, namely sodium dodecyl benzenesulfonate (SDBS), sodium cholate (SC), and tetra-butyl ammonium bromide (TBAB), indicate that exfoliation of MoS2 nanosheets in SDBS is highly efficient than the other two surfactants. The estimated yield reaches up to 7.25%, with a nanosheet concentration of 1.45 mg/ml, which is one of the highest ever reported. Our studies also suggest that the nanosheets' concentration and the lateral size depend on exfoliation cycles, applied pressure and surfactant concentration. Hydrogen evolution reaction (HER) and ion-transport study show that the nanosheets prepared by our method are stable in an acidic medium and free from surfactants. A high hydrogen evolution rate of 30.13 mmol g-1 h-1 was estimated under ambient laboratory conditions.
