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Spectrophotometry: Introduction01:16

Spectrophotometry: Introduction

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Spectrophotometry is the quantitative measurement of the absorption, reflection, diffraction, or transmission of electromagnetic radiation through a material as a function of the intensity and wavelength of the radiation. A spectrophotometer is a device used to measure the change in the radiation intensity caused by its interaction with the material.
The essential components of a spectrophotometer include a source of electromagnetic radiation, a slot for placing a material to be analyzed, and a...
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通过光学光谱学量化单层MoS2中的载体密度.

Alexis R Myers1,2, Dana B Sulas-Kern2, Rao Fei2,3

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在纳米级材料中量化电荷载体密度具有挑战性. 这项研究将单层MoS2电子密度与光学吸收火相对应,为估计过渡金属二甲基化物系统中载体密度提供了一种新方法.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 纳米技术纳米技术
  • 物理化学 物理化学

背景情况:

  • 精确控制电荷载体密度对于纳米级异面接口设计至关重要.
  • 在纳米材料中量化这些密度是困难的,阻碍了对载体依赖性质的理解.

研究的目的:

  • 开发一种方法,将单层MoS2电子密度与光学吸收相关联.
  • 阐明电荷密度,介电环境和激电性质之间的关系.

主要方法:

  • 使用了稳态和瞬态吸收光谱仪.
  • 采用了一个二维相位空间填充模型.
  • 在s-SWCNT/MoS2异构结构中,与激发性光学吸收火相关的电子密度.

主要成果:

  • 建立了单层MoS2电子密度和刺激吸收火之间的相关性.
  • 阶段空间填充模型成功地描述了MoS2,WS2和MoSe2单层的趋势.
  • 展示了一种适用于各种基于过渡金属二甲基 (TMDC) 的系统的方法.

结论:

  • 开发的光谱方法允许估计地面和激发状态载体密度.
  • 为研究人员提供了一条途径,在TMDC系统中量化载体密度.
  • 增强对纳米材料中载体密度依赖现象的理解.