Patterned Bulge Carrier for Single Molecule Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional glass substrates coated with aggregated silver particle films are not suitable for detecting low concentration single molecules due to weak Raman scattering signals and low resolution in Raman spectroscopy.
Innovation Solution
A carrier for single molecule detection is developed, featuring a substrate with a patterned bulge structure and a metal layer, where the substrate is coated with a carbon nanotube composite structure to enhance surface-enhanced Raman scattering (SERS), improving the detection resolution and sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a glass substrate coated with aggregated silver particle film is used for Raman detection, then the device structure is simple, but the Raman scattering signal is weak and the detection resolution is low
Solution Approach 1:
The substrate surface is divided into numerous pyramid-shaped nanostructures with specific geometric parameters (base edge length 100-500nm, height 200-800nm). This segmentation creates multiple light scattering centers and plasmonic hotspots, transforming the smooth surface into a structured array that significantly enhances Raman scattering signals while maintaining a systematic and manufacturable device architecture.
Solution Approach 2:
The invention transitions from a two-dimensional flat substrate surface to a three-dimensional structured surface with pyramid nanostructures. This dimensional change introduces vertical components and surface area multiplication, creating plasmonic hotspots at the pyramid tips and edges that dramatically enhance the Raman scattering effect, thereby improving detection resolution without excessive structural complexity.
2Ease of manufacture
If a smooth glass substrate is used, then the manufacturing process is simple, but the Raman scattering signal strength is insufficient
Solution Approach 1:
The substrate surface is transformed from a flat plane to an array of pyramid-shaped structures with curved surfaces. The curved surfaces of the pyramids facilitate light scattering and concentration, creating plasmonic hotspots at the apex and edges. This curvature-based design significantly enhances Raman scattering signal intensity while using standard semiconductor fabrication techniques that are already well-established in manufacturing.
Solution Approach 2:
The invention changes the physical parameters of the substrate surface by introducing nano-scale pyramid structures with specific dimensions (base edge 100-500nm, height 200-800nm). These parameter changes at the nanoscale create plasmonic resonance effects that amplify the Raman scattering signal by several orders of magnitude, while the fabrication process remains compatible with existing manufacturing capabilities through controlled deposition and etching techniques.
3Reliability
If aggregated silver particles are coated on the substrate, then the SERS effect is enhanced, but the detection sensitivity remains insufficient for low concentration samples
Solution Approach 1:
Instead of uniformly distributing silver particles across the substrate, the invention concentrates plasmonic enhancement at specific locations - the pyramid tips and edges where electromagnetic field concentration is maximum. This local quality approach creates discrete hotspots that provide intense SERS enhancement precisely where analyte molecules are most likely to adsorb, thereby dramatically improving detection sensitivity for low concentration samples while maintaining reliable SERS enhancement.
Data Source
AI summary
The disclosure relates to a device for single molecule detection. The device includes a chamber having an inputting hole and an outputting hole, a carrier including a substrate and a metal layer located on the substrate, a detection device, and a controlling computer. The carrier includes a substrate and a metal layer on the substrate, wherein the substrate includes a base and a patterned bulge located on a surface of the base, the patterned bulge includes a number of strip-shaped bulges intersected with each other to form a net and define a number of holes, and the metal layer is located on the patterned bulge. The carrier for single molecule detection has a relative higher SERS and can enhance the Raman scattering.