SERS Substrate with Periodic Nanostructure for Trace Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Traditional methods for detecting trace biological and chemical analytes are expensive, time-consuming, and lack sensitivity, and existing surface-enhanced Raman scattering (SERS) substrates face challenges in achieving large area, high uniformity, and high Raman scattering intensity due to poor adhesion and costly fabrication processes.
Innovation Solution
A surface-enhanced Raman scattering substrate is developed, comprising a substrate with a periodic nanostructure, a reflection layer, a dielectric layer, and a metal thin film layer, which enhances Raman scattering intensity by optimizing the nanostructure's shape, period, and layer thickness to match resonance wavelengths with excitation laser wavelengths, thereby improving signal detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional detection instruments are used, then detection accuracy is sufficient, but the cost is high and measurement time is long
Solution Approach 1:
The invention changes the detection method from traditional instrumental analysis to SERS-based optical detection, utilizing the unique Raman scattering parameters of different substances to achieve rapid identification and quantification without complex instrumentation, thereby reducing measurement time while maintaining detection accuracy
Solution Approach 2:
The invention replaces traditional mechanical/detector-based detection systems with an optical detection system based on Raman scattering and SERS effects, using light-matter interaction to achieve rapid, non-contact detection that eliminates the need for complex mechanical measurement processes
2Ease of manufacture
If nanostructure is formed by self-assembly, then fabrication is simplified, but adhesion to substrate is poor and uniformity is low
Solution Approach 1:
The invention segments the fabrication process into two distinct stages: first forming the nanostructure array through self-assembly, then depositing additional material layers through chemical vapor deposition. This segmentation allows each process to optimize for its specific function, maintaining fabrication simplicity while achieving high uniformity
Solution Approach 2:
The invention creates a composite structure combining self-assembled nanostructures with CVD-deposited material layers. The composite approach leverages the self-organization capability of the first component and the uniform coverage of the second component, achieving both ease of manufacture and high manufacturing precision
3Manufacturing precision
If photo lithography process is used, then substrate precision is high, but fabrication cost is high and time consumption is high
Solution Approach 1:
The invention employs self-assembly of nanostructures, where the system spontaneously organizes itself into the desired pattern without requiring external guidance or complex lithography tools. This self-service approach achieves high precision substrate preparation while eliminating the need for expensive photo lithography equipment and processes
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The substrate achieves significant enhancement of Raman scattering signals, enabling sensitive and cost-effective trace detection of analytes, with improved detection limits and reduced background interference, as demonstrated by enhanced Raman spectra in various examples.
Implementation Method 1
Scientists use a metal structure to induce the surface-Enhanced Raman Scattering (SERS) to amplify the scattering intensity 104-1012 times
Implementation Method 2
a reflection layer formed on the substrate
Implementation Method 3
providing a laser excitation light to the analyte to form a Raman scattering signal
Data Source
AI summary
The invention provides a surface-enhanced Raman scattering substrate and a trace detection method of a biological and chemical analyte using the same. The substrate includes: a substrate having a periodic nanostructure; a reflection layer formed on the substrate; a dielectric layer formed on the reflection layer; and a metal thin film layer formed on the dielectric layer.