在WS2单层中应变分布通过极化解决的第二波生成检测到.
George Kourmoulakis1,2, Sotiris Psilodimitrakopoulos3, George Miltos Maragkakis1,4
1Institute of Electronic Structure and Laser, Foundation for Research and Technology - Hellas, 71110, Heraklion, Crete, Greece.
Scientific reports
|July 2, 2024
概括
这项研究引入了一种全光学方法,使用极化分辨率的第二波生成 (P-SHG) 成像来绘制像WS2这样的2D材料中的应变图. 这种技术使得快速,大面积的应变检测对于开发先进的电子设备至关重要.
科学领域:
- 材料科学 材料科学 材料科学
- 凝聚物质物理学 凝聚物质物理学
- 纳米技术纳米技术
背景情况:
- 二维 (2D) 材料,包括石墨烯和石墨烯相关材料 (GRMs),对于下一代电子产品至关重要.
- 基质相互作用会诱导GRM的应变,改变它们的电子特性,并使应变电子学领域成为可能.
- 开发快速,非侵入性的方法来探测二维材料大面积的应变对于设备研究至关重要.
研究的目的:
- 展示一种全光学成像技术,用于绘制二维材料单层中的应变分布图.
- 通过使用偏振解析的第二波生成 (P-SHG) 来研究在有图案的Si/SiO2基板上的WS2单层中诱导的应变.
- 为了将光学测量与原子力显微镜和拉曼光谱进行关联,以确认应变.
主要方法:
- 使用极化分辨率的第二波生成 (P-SHG) 光学成像来检测应变.
- 应用P-SHG数据的pixel-by-pixel拟合,以生成水晶扶手椅方向的空间分辨率图像.
- 采用原子力显微镜 (AFM) 和拉曼映射用于独立验证应变.
主要成果:
- 在预先模拟的基板上的单层WS2中成功识别了应变分布.
- 在WS2符合基板地形的紧张区域的扶手椅方向图像中观察到明显的十字形图案.
- 通过补充AFM和拉曼光谱分析证实了菌株的存在.
结论:
- P-SHG成像是一种有效的,最少的侵入性工具,可以在2D材料中绘制大面积的应变图.
- 这些发现突显了P-SHG在2D电子设备的质量控制和开发方面的潜力.
- 使用这种先进的光学成像技术,可以精确地描述2D材料的应变工程.
更多相关视频
09:00Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
Published on: June 28, 2018
9.9K
05:54Author Spotlight: Non-Invasive Imaging of Complex Bio-Structures Using Polarization-Sensitive Two-Photon Microscopy
Published on: September 8, 2023
1.2K
相关概念视频
¹³C NMR: ¹H–¹³C Decoupling
The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
Standing Waves in a Cavity
A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
Double Resonance Techniques: Overview
Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
Spin decoupling is usually achieved by...
