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首页> 外文期刊>Nanotechnology >Acetone improves the topographical homogeneity of liquid phase exfoliated few-layer black phosphorus flakes
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Acetone improves the topographical homogeneity of liquid phase exfoliated few-layer black phosphorus flakes

机译：丙酮改善了液相的地形均匀性剥离了几层黑色磷薄片

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摘要

Liquid phase exfoliation of 2D materials has issues related to the sorption of the solvent, the oxidation of the sample during storage, and the topographical inhomogeneity of the exfoliated material. N-methyl-2-pyrrolidone (NMP), a common solvent for black phosphorus (BP) exfoliation, has additional drawbacks like the formation of by-products during sonication and poor solvent volatility. Here we demonstrate an improvement in the topographical homogeneity (i.e. thickness and lateral dimensions) of NMP-exfoliated BP flakes after resuspension in acetone. The typical size of monolayers and bilayers stabilised in acetone was 99.8 +/- 27.4 nm and 159.1 +/- 57 nm, respectively. These standard deviations represent a threefold improvement over those of the NMPexfoliated originals. Phosphorene can also be exfoliated directly in acetone by very long ultrasonication. The product suspension enjoys the same dimensional homogeneity benefits, which confirms that this effect is an intrinsic property of the acetone-BP system. The quality and stability of the exfoliated flakes was checked by XRD, TEM, electron diffraction and Raman spectroscopy. Thermal expansion coefficients of the A(g)(1) , B-2g and A(g)(2) Raman modes were calculated for drop-casted samples as -0.018 28 cm(-1)K(-1), -0.030 56 cm(-1)K(-1) and -0.032 19cm(-1)K(-1), respectively. The flakes withstand 20 min in O-2 flow at 373 K without lattice distortion.
机译：2D材料的液相剥离具有与溶剂的吸附有关的问题，储存过程中样品的氧化，以及剥离材料的地形不均匀性。 N-甲基-2-吡咯烷酮（NMP），黑磷（BP）去角质的普通溶剂，具有额外的缺点，如在超声处理期间形成副产物和溶剂挥发性不良。在这里，我们证明了在丙酮中重新悬浮后NMP剥落的BP薄片的地形均匀性（即厚度和横向尺寸）的改善。在丙酮中稳定的单层和双层的典型尺寸分别为99.8 +/- 27.4nm和159.1 +/- 57nm。这些标准偏差表示对NMPEXFOLIED原件的三倍改进。磷烯也可以通过非常长的超声波直接在丙酮中剥离。产品悬浮液均享有相同的尺寸均匀益处，这证实了这种效果是丙酮-BP系统的内在性质。通过XRD，TEM，电子衍射和拉曼光谱检查剥落的薄片的质量和稳定性。 A（g）（1），b-2g和a（g）（2）拉曼模式的热膨胀系数用于滴浇注的样品为-0.018 28cm（-1）k（-1），-0.030分别为56厘米（-1）k（-1）和-0.032 19cm（-1）k（-1）。薄片在O-2流量下耐用20分钟，在373 k的情况下没有晶格变形。

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