Evidence of Surface-Mediated Carrier-Phonon Scattering in MXene,ACS Nano

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Evidence of Surface-Mediated Carrier-Phonon Scattering in MXene
ACS Nano ( IF 15.8 ) Pub Date : 2023-11-27 , DOI: 10.1021/acsnano.3c07431
Jie Zhao _{1,

2} , Qi Zhang ₂ , Laizhi Sui ₂ , Guangming Niu ₂ , Yutong Zhang ₂ , Guorong Wu ₂ , Shengrui Yu ₁ , Kaijun Yuan _{2,

3,

4} , Xueming Yang _{2,

4,

5}

Affiliation

In a two-dimensional (2D) metallic nanostructure, when a sample’s thickness is shorter than a carrier mean free path, the ultrathin thickness may influence carrier and energy transport, owing to surface scattering. However, to date, for metallic 2D transition-metal carbides (MXenes), experiments and calculations related to surface scattering have not been performed. The contribution of ultrathin structures to carrier surface scattering in MXene is yet to be explored. Herein, to reveal this effect, we design various models, including metal/MXene, dielectric/MXene, and bulk structure, and analyze their carrier dynamics via ultrafast spectroscopy. The results related to carrier dynamics indicate that the influence of the dielectric/MXene interface and the temperature is negligible. In contrast, the carrier dynamic lifetimes are prolonged owing to weakened surface scattering in metal/MXene, which is supported by ab initio calculations. These results suggest that the carrier-phonon scattering is dominated by surface scattering. These findings can help guide effective energy transport and enhance energy conversion and catalysis.

中文翻译：

MXene 中表面介导的载流子声子散射的证据

在二维 (2D) 金属纳米结构中，当样品的厚度短于载流子平均自由程时，由于表面散射，超薄的厚度可能会影响载流子和能量传输。然而，迄今为止，对于金属二维过渡金属碳化物（MXenes），尚未进行与表面散射相关的实验和计算。超薄结构对 MXene 中载流子表面散射的贡献仍有待探索。在这里，为了揭示这种效应，我们设计了各种模型，包括金属/MXene、电介质/MXene和体结构，并通过超快光谱分析它们的载流子动力学。与载流子动力学相关的结果表明，电介质/MXene 界面和温度的影响可以忽略不计。相比之下，由于金属/MXene 中的表面散射减弱，载流子动态寿命延长，这一点得到了从头计算的支持。这些结果表明载流子声子散射以表面散射为主。这些发现有助于指导有效的能量传输并增强能量转化和催化。

更新日期：2023-11-27

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