在石墨烯上的共振拉曼散射:SERS和间隙模式TERS
N N Kurus1, V Kalinin2, N A Nebogatikova1,2
1Rzhanov Institute of Semiconductor Physics (SBRAS) Lavrentjev av. 13 Novosibirsk 630090 Russia ifp@isp.nsc.ru.
RSC advances
|January 25, 2024
概括
间隙模式尖端增强拉曼散射 (gm-TERS) 精确地映射2D材料中的纳米尺度缺陷. 这项技术揭示了石墨烯的局部应变,这对于开发先进的传感器和电子设备至关重要.
科学领域:
- 材料科学 材料科学 材料科学
- 纳米技术纳米技术
- 频谱学是一种光谱学.
背景情况:
- 2D材料中的纳米尺度变形会影响电子特性,需要高分辨率的表征技术.
- 表面增强的拉曼散射 (SERS) 传感器对石墨烯的结构变化敏感.
- 现有的方法难以解决二维材料中的局部缺陷和机械状态.
研究的目的:
- 为了证明2D材料结构和机械状态的纳米尺度探测的间隙模式尖端增强拉曼散射 (gm-TERS).
- 使用SERS优化gm-TERS参数,以提高信号和分辨率.
- 在石墨烯薄膜中描述局部应变和缺陷.
主要方法:
- 在等离子金纳米盘阵列顶部的单层石墨烯薄膜上利用了间隙模式尖端增强的拉曼散射 (gm-TERS).
- 采用SERS来确定gm-TERS的最佳金纳米盘直径和激发波长.
- 在gm-TERS光谱中分析了振动模式 (G模式分裂),以检测和量化局部应变.
主要成果:
- 对于石墨烯振动模式,实现了100的局部等离子增强因子.
- 展示了10纳米的空间分辨率,使纳米级化学映射成为可能.
- 在石墨烯中检测到局部拉力机械应变,由G模式分裂 (G+和G-) 证明,估计应力高达1.5%.
结论:
- 间隙模式TERS是一个强大的工具,用于快速和精确的纳米尺度描述2D材料中的局部结构缺陷.
- 该技术允许检测和量化石墨烯中的机械应变.
- gm-TERS映射具有很大的潜力,可以促进基于2D材料的设备的开发,例如SERS传感器.
相关概念视频
01:20Raman Spectroscopy: Overview
394
The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and...
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and...
394
01:26Raman Spectroscopy Instrumentation: Overview
387
A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
387
01:24IR Spectroscopy: Molecular Vibration Overview
2.3K
When Infrared (IR) radiation passes through a covalently bonded molecule, the bonds transition from lower to higher vibrational levels. The fundamental vibrational motions that result in infrared absorption can be classified as stretching or bending vibrations.
Stretching vibrations are vibrational motions that occur along the bond line, changing the bond length or distance between two bonded atoms. They are further distinguished as symmetric or asymmetric. In symmetric stretching, the...
Stretching vibrations are vibrational motions that occur along the bond line, changing the bond length or distance between two bonded atoms. They are further distinguished as symmetric or asymmetric. In symmetric stretching, the...
2.3K