3D Nanostructured SERS Substrate for Single Molecule Detection
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Solution Overview
Problem
Conventional Raman spectroscopy methods using smooth glass substrates are inadequate for detecting low concentration single molecules due to weak Raman scattering signals and low resolution.
Innovation Solution
A carrier with three-dimensional nanostructures, such as pine-shaped metal nanostructures, is used on a substrate to enhance Raman scattering by creating a surface-enhanced Raman scattering (SERS) effect, improving the detection resolution of single molecules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a smooth glass substrate is used for Raman spectroscopy, then the device complexity is low, but the Raman scattering signal strength is weak and detection resolution is low
Solution Approach 1:
The patent transitions from a two-dimensional smooth surface to a three-dimensional nanostructured surface. The substrate is modified with vertical nanoscale features (nanowires, nanorods, or nanopillars) that extend into the third dimension, creating multiple interfaces and plasmonic hot spots that dramatically enhance Raman scattering signals and enable single-molecule detection
Solution Approach 2:
The patent introduces localized plasmonic structures with specific geometric features (varying heights, diameters, and spacing) that create localized electromagnetic field enhancements at specific positions. These local structural variations generate 'hot spots' where Raman scattering is dramatically enhanced, allowing detection of individual molecules at specific locations on the substrate
2Measurement precision
If aggregated silver particle film is coated on smooth glass substrate, then some enhancement is achieved, but the Raman scattering signal is still not strong enough for low concentration single molecule detection
Solution Approach 1:
The patent combines metal nanostructures (silver, gold, or copper nanowires, nanorods, or nanopillars) with dielectric substrates (glass, silicon dioxide, or silicon nitride) to create composite SERS substrates. The metal components provide plasmonic enhancement while the dielectric substrate provides mechanical support, achieving superior signal enhancement compared to aggregated silver particles alone
Solution Approach 2:
The patent employs curved and tapered nanostructures (nanowires with varying diameters, nanorods with rounded ends, or nanopillars with tapered profiles) rather than flat surfaces. These curved geometries concentrate electromagnetic fields at convex surfaces and tips, creating intense local field enhancements that dramatically boost Raman scattering signals
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 nanostructured carrier significantly enhances the Raman scattering signal, enabling more accurate detection of single molecules at low concentrations by increasing the resolution and sensitivity of the detection process.
Implementation Method 1
A carrier with three-dimensional nanostructures, such as pine-shaped metal nanostructures, is used on a substrate to enhance Raman scattering by creating a surface-enhanced Raman scattering (SERS) effect
Implementation Method 2
A laser irradiation is supplied to the single molecule samples by a Raman detection system to cause a Raman scattering and produce a Raman spectroscopy
Data Source
AI summary
A method of detecting single molecule includes: providing a carrier, wherein the carrier includes a substrate, and a plurality of three-dimensional nanostructures are located on the substrate; disposing single molecule samples on the plurality of three-dimensional nanostructures; detecting the single molecule samples with a detector; wherein each three-dimensional nanostructure includes a first rectangular structure, a second rectangular structure, and a triangular prism structure; the first rectangular structure, the second rectangular structure, and the triangular prism structure are stacked in that order, a first width of a bottom surface of the triangular prism structure is equal to a second width of a first top surface of the second rectangular structure and greater than a third width of a second top surface of the first rectangular structure, and the first rectangular structure comprises a first metal and the triangular prism structure comprises a second metal.