Size-controlled MoS2 nanosheet through ball milling exfoliation: parameter optimization, structural characterization and electrocatalytic application
Size-controlled MoS2 nanosheet through ball milling exfoliation: parameter optimization, structural characterization and electrocatalytic application
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DOI：
10.1088/1361-6528/ab5077
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发表时间：
2019-11
期刊：
影响因子：
3.5
通讯作者：
A. Tayyebi;N. Ogino;T. Hayashi;N. Komatsu
中科院分区：
文献类型：
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作者：
A. Tayyebi;N. Ogino;T. Hayashi;N. Komatsu
二维材料的独特性能和潜在应用使其大规模生产成为人们关注的焦点。球磨剥离的2D材料已很少使用，尽管一个有前途的干相生产方法，因为表面的信息的机制和操作参数对产量，尺寸和厚度的影响。在这里，我们系统地研究了在胆酸钠（SC）作为剥离剂的存在下，大块二硫化钼的剥离中的球磨操作参数。通过改变体相MoS 2和SC的重量比（SC/MoS 2）、球磨球和容器的体积填充比（φ）、球磨球尺寸（dB）、球磨转速（nR）和体相MoS 2的初始质量（mMoS 2）等参数，监测剥离的MoS 2纳米片的产率和尺寸。在最佳球磨条件（SC/MoS 2 = 0.75，φ = 50%，mMoS 2 = 0.20g）下，剥离率可达95%。此外，剥离的MoS 2的产率和尺寸由球磨的条件控制。至于剥离的MoS 2的评价，我们开发了一种新的方法，通过使用XRD曲线来确定球磨的MoS 2粉末的尺寸和厚度，与通过众所周知的吸收法确定的那些相差小于30%。最后，通过球磨剥离法制备的MoS 2纳米片的尺寸和厚度与其电催化和光电催化活性相关。
Unique properties and potential applications of 2D materials draw much attention for mass production of thin-layer 2D materials. Ball milling exfoliation of 2D materials has been rarely used, in spite of a promising dry phase production method, because of the superficial information in the mechanism and the effect of the operating parameters on the yield, size and thickness. Here, we investigate systematically the ball milling operating parameters in the exfoliation of bulk MoS2 in the presence of sodium cholate (SC) as an exfoliant. The yield and dimensions of the exfoliated MoS2 nanosheet were monitored by changing the parameters such as the weight ratio of bulk MoS2 and SC (SC/MoS2), the filling ratio in the volume of milling ball and container (φ), milling ball size (dB), milling revolution speed (nR), and initial mass of bulk MoS2 ( m MoS 2 ). The yield of exfoliation is found to be 95% at the optimum ball milling conditions (SC/MoS2 = 0.75, φ = 50%, m MoS 2 = 0.20 g). In addition, yield and size of the exfoliated MoS2 were controlled by the conditions of the ball milling. As for the evaluation of the exfoliated MoS2, we developed a novel method by use of the XRD profile to determine the size and thickness of the ball-milled MoS2 powder with less than 30% difference from those determined by the well-known absorption method. Finally, the size and thickness of the MoS2 nanosheets prepared by ball milling exfoliation were correlated with their electrocatalytic and photoelectrocatalytic activities.