活性表面增强拉曼光谱 (SERS):一种新的概念,用于增强复杂矩阵中的信号对比度,使用外部扰动
Sara Mosca1, Megha Mehta2, William H Skinner2
1Central Laser Facility, Research Complex at Harwell, STFC Rutherford Appleton Laboratory, UKRI, Harwell Campus, Oxfordshire, UK.
Applied spectroscopy
|August 2, 2024
概括
主动SERS使用外部干扰来增强深层组织信号检测. 这种新的方法提高了信号对比度,并减少了背景噪声,以更清晰地诊断疾病和监测治疗.
科学领域:
- 生物医学光学 生物医学光学
- 频谱学是一种光谱学.
- 纳米技术纳米技术
背景情况:
- 表面增强拉曼光谱 (SERS) 信号的深层组织的非侵入性检测是具有挑战性的,因为信号很弱,周围组织的背景噪声很大.
- 现有的方法往往具有低于最佳的灵敏度,阻碍了在疾病诊断和治疗监测中的应用.
- 类似的问题也影响了其他复杂的,分散分散的样本中的SERS测量.
研究的目的:
- 介绍和演示一种新的概念,即"主动SERS",用于有效地从生物组织等复杂矩阵的深处检索SERS信号.
- 为了减轻弱信号和背景干扰在深层组织SERS检测中的问题.
- 为了提高疾病诊断和治疗监测应用的灵敏度和清晰度.
主要方法:
- 拟议的"主动SERS"概念涉及外部干扰 (例如超声波) 来改变矩阵内的纳米粒子 (NP) 的SERS信号.
- 使用超声波扰动在SERS金纳米颗粒上演示了该概念,这些纳米颗粒被插入到异质组织幻影的深处.
- 采用传输拉曼光谱检测信号,适用于其他拉曼实现.
主要成果:
- 应用的超声波干扰导致SERS总体信号强度下降约21%.
- 通过有效消除矩阵背景信号和减法工件,显著改善了SERS信号对比度.
- 与传统测量相比,可以更清晰地检测SERS信号.
结论:
- 主动SERS提供了一种有效的策略,可以从复杂矩阵的深处获取SERS信号,克服灵敏度的限制.
- 该技术显著提高了信号对比度,并减少了干扰的背景噪声,为改进的诊断和监控工具铺平了道路.
- 未来积极SERS纳米颗粒的设计可以进一步增强对外部刺激的反应,提高检测灵敏度.
相关概念视频
01:20Raman Spectroscopy: Overview
350
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...
350
01:20¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)
1.0K
When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
1.0K
01:26Raman Spectroscopy Instrumentation: Overview
321
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...
321