Controlled Production of MoS2 Full‐Scale Nanosheets and Their Strong Size Effects,Advanced Materials Interfaces

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Controlled Production of MoS2 Full‐Scale Nanosheets and Their Strong Size Effects
Advanced Materials Interfaces ( IF 4.3 ) Pub Date : 2020-10-19 , DOI: 10.1002/admi.202001130
Cheng Liang _{1,

2} , Xinyu Sui _{2,

3} , Aocheng Wang ₃ , Jinquan Chang _{1,

2} , Weibiao Wang _{1,

2} , Zhexue Chen _{1,

2} , Wenyu Jiang _{1,

2} , Yanhong Ma ₁ , Jianqi Zhang ₁ , Xinfeng Liu _{2,

3} , Yong Zhang _{1,

2}

Affiliation

The production of 2D nanosheets (2D NSs) with all sizes (1–100 nm) and few (<10) layers is highly desired but remains great challenge. Herein, the top‐down production of molybdenum disulfide (MoS₂) NSs with wide‐range (161–10 nm) controlled sizes is reported. Considering the recently achieved MoS₂ quantum sheets (QSs) with sizes of ≈2 nm, full‐scale NSs of MoS₂ are successfully produced. The top‐down method combines silica‐assisted ball‐milling and sonication‐assisted solvent exfoliation. Ball‐milling with controlled time enables the production of multiscale NSs with varying distributions, which are then precisely separated by cascade centrifugation. Multiple spectroscopic techniques reveal the dramatic size dependence, indicating prominent quantum confinement and edge effects of the MoS₂ NSs. The NSs‐poly(methyl methacrylate) (PMMA) hybrid thin films demonstrate strong size effects in nonlinear saturation absorption (NSA). Both (absolute) modulation depths and saturation intensities can be broadly modulated by simple variation of the NS sizes. With the sizes down from 161 to 10 nm, the modulation depths are increased from 27.0% to 51.3% and the saturation intensities are decreased from 33 419 to 21.2 kW cm⁻² (3341.9–2.12 nJ cm⁻²). The work greatly facilitates the mass production and full exploration of 2D NSs with all sizes.

中文翻译：

MoS2全尺寸纳米片的受控生产及其强大的尺寸效应

具有各种尺寸（1–100 nm）和很少（<10）层的2D纳米片（2D NSs）的生产是非常需要的，但仍然是巨大的挑战。本文报道了自上而下生产的二硫化钼（MoS ₂）NSs具有宽范围（161–10 nm）控制的尺寸。考虑到最近获得的≈2nm尺寸的MoS ₂量子片（QSs），MoS _2的全尺寸NSs成功生产。自上而下的方法结合了二氧化硅辅助的球磨和超声辅助的溶剂剥离。通过控制时间的球磨，可以生产出具有不同分布的多尺度NS，然后通过级联离心将其精确分离。多种光谱技术揭示了戏剧性的尺寸依赖性，表明MoS _2的突出量子限制和边缘效应NSs。NSs-聚（甲基丙烯酸甲酯）（PMMA）混合薄膜在非线性饱和吸收（NSA）中显示出强大的尺寸效应。（绝对）调制深度和饱和强度都可以通过简单改变NS大小来广泛地调制。当尺寸从161 nm减小到10 nm时，调制深度从27.0％增加到51.3％，饱和强度从33 419减少到21.2 kW cm ^-2（3341.9–2.12 nJ cm ^-2）。这项工作极大地促进了各种规模的2D NS的批量生产和全面探索。

更新日期：2020-12-17

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