3D Nanostructure Carrier for Single Molecule Detection
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Solution Overview
Problem
Conventional glass substrates with aggregated silver particle films are not suitable for detecting low concentration single molecules due to weak Raman scattering signals and low resolution, necessitating a more effective carrier for single molecule detection.
Innovation Solution
A carrier with a substrate featuring three-dimensional nano-structures and a metal layer is developed, where the substrate can be made of materials like silicon dioxide and the nano-structures are arranged in arrays to enhance surface-enhanced Raman scattering (SERS) by producing surface plasmon resonance at gaps between structures, significantly increasing the enhancement factor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If aggregated silver particle film is coated on smooth glass substrate, then single molecule detection is enabled, but Raman scattering signal strength is insufficient and resolution is low
Solution Approach 1:
The patent transitions from a two-dimensional flat silver particle film to a three-dimensional nanostructure array with vertical protrusions. This dimensional change creates multiple scattering interfaces and enhances the electromagnetic field distribution, resulting in significantly stronger Raman scattering signals and improved detection resolution for single molecules.
Solution Approach 2:
The patent modifies the physical parameters of the substrate surface by introducing three-dimensional nanostructures with specific geometric characteristics (protrusion height, base area, spacing). These parameter changes create optimized electromagnetic field enhancement zones that dramatically increase Raman scattering signal strength while maintaining single molecule detection capability.
2Illumination intensity
If smooth glass substrate is used, then carrier simplicity is maintained, but Raman scattering signal enhancement is insufficient
Solution Approach 1:
The patent segments the substrate surface into multiple identical three-dimensional nanostructure units arranged in arrays. This segmentation approach systematically enhances Raman scattering across the entire substrate area while maintaining manufacturing feasibility through repetitive patterning processes.
Solution Approach 2:
The patent creates a nanostructured surface with controlled porosity and void spaces between protrusions. This porous-like structure enhances electromagnetic field localization and provides additional scattering centers, significantly boosting Raman signal strength without requiring complex multi-layer compositions.
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 carrier enhances Raman scattering signals by up to 1010-fold, improving the sensitivity and reproducibility of single molecule detection, particularly for low concentration samples, compared to traditional aggregated silver particle films.
Implementation Method 1
the nano-structures are arranged in arrays to enhance surface-enhanced Raman scattering (SERS) by producing surface plasmon resonance at gaps between structures
Implementation Method 2
enhance surface-enhanced Raman scattering (SERS) by producing surface plasmon resonance at gaps between structures, significantly increasing the enhancement factor
Data Source
AI summary
A method for detecting single molecule includes providing a carrier. The carrier includes a substrate and a metal layer. The substrate has a surface and defines a number of blind holes caved in the substrate from the surface thereof. The metal layer covers the surface of the substrate and inner surfaces of the number of blind holes. Single molecule samples are disposed on the metal layer. The single molecule samples are detected by a Raman Spectroscopy system.