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Excitons and Trions in One‐Photon‐ and Two‐Photon‐Excited MoS2: A Study in Dispersions
Advanced Materials ( IF 27.4 ) Pub Date : 2018-02-07 , DOI: 10.1002/adma.201706702 Leonie Wibmer 1 , Sebastian Lages 2 , Tobias Unruh 2 , Dirk M. Guldi 1
Advanced Materials ( IF 27.4 ) Pub Date : 2018-02-07 , DOI: 10.1002/adma.201706702 Leonie Wibmer 1 , Sebastian Lages 2 , Tobias Unruh 2 , Dirk M. Guldi 1
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Herein, various dispersions of MoS2 obtained by means of liquid phase exfoliation are spectroscopically, (spectro‐) electrochemically, and microscopically characterized. At the core of these studies are transient absorption assays. Importantly, small‐angle X‐ray scattering measurements are employed to corroborate the exfoliated character of the MoS2 flakes in dispersion, on the one hand, and to correlate the results with TEM, AFM, and Raman characterization in the solid state, on the other. It is, then, demonstrated that transient absorption spectroscopy responds sensitively not only to changes in the sample preparation but also to instrumental and environmental parameters. It is documented that the spectroscopic features and their underlying lifetimes are tuneable on the femto‐, pico‐, and nanosecond scales by changing, for example, the centrifugation speed, the pump fluence, or the temperature. In other words, transient absorption spectroscopy provides an in situ method to quantitatively characterize liquid dispersions of MoS2 without facing the problems of reaggregated samples due to their drying for microscopic assays. The most far reaching results stem from resonantly and nonresonantly changing the pump fluence to characterize either single‐ or multiple‐excited‐state species such as excitons, trions, and bi‐/multiexcitons and to follow their formation and deactivation pattern.
中文翻译：
一光子和二光子激发的MoS2中的激子和三子：色散研究
在此，对通过液相剥落获得的MoS 2的各种分散体进行了光谱，电化学（电化学）和微观表征。这些研究的核心是瞬态吸收测定。重要的是，采用小角度X射线散射测量来证实MoS 2的剥落特性一方面分散成薄片，另一方面使结果与固态的TEM，AFM和拉曼表征相关。然后证明，瞬态吸收光谱法不仅对样品制备中的变化敏感，而且对仪器和环境参数敏感。据记录，通过改变离心速度，泵注量或温度，可以在毫微微秒，皮秒和纳秒级上调节光谱特征及其基本寿命。换句话说，瞬态吸收光谱法提供了一种原位方法来定量表征MoS 2的液体分散体不会因为干燥而进行显微分析而遇到重新聚集的样品的问题。最深远的结果来自共振和非共振地改变泵浦通量，以表征单激态或多激态物种，例如激子，三重子和双/多激子，并遵循它们的形成和失活模式。
更新日期：2018-02-07
中文翻译：
一光子和二光子激发的MoS2中的激子和三子：色散研究
在此，对通过液相剥落获得的MoS 2的各种分散体进行了光谱，电化学（电化学）和微观表征。这些研究的核心是瞬态吸收测定。重要的是，采用小角度X射线散射测量来证实MoS 2的剥落特性一方面分散成薄片，另一方面使结果与固态的TEM，AFM和拉曼表征相关。然后证明，瞬态吸收光谱法不仅对样品制备中的变化敏感，而且对仪器和环境参数敏感。据记录，通过改变离心速度，泵注量或温度，可以在毫微微秒，皮秒和纳秒级上调节光谱特征及其基本寿命。换句话说，瞬态吸收光谱法提供了一种原位方法来定量表征MoS 2的液体分散体不会因为干燥而进行显微分析而遇到重新聚集的样品的问题。最深远的结果来自共振和非共振地改变泵浦通量，以表征单激态或多激态物种，例如激子，三重子和双/多激子，并遵循它们的形成和失活模式。
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