Reusable SERS Molecular Detection Structure With Air-Gap Isolation
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Solution Overview
Problem
Existing SERS substrates face high manufacturing costs and irreversible contamination issues due to molecule adsorption, limiting their reuse and increasing usage expenses.
Innovation Solution
A reusable SERS detection apparatus with a laminar glass structure and a metal ring forming a two-dimensional air cavity, allowing molecules to be detected without direct contact with the SERS substrate, using gold and silver nanostructures for electromagnetic reinforcement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If molecules are absorbed directly on the SERS substrate surface for detection, then detection sensitivity is improved, but the substrate becomes irreversibly polluted and cannot be reused
Solution Approach 1:
The system is divided into three functional layers: a SERS substrate layer for signal enhancement, an air gap layer for isolation, and a molecule-containing layer for detection. This segmentation allows the substrate to provide enhancement without direct contact with molecules, preventing contamination and enabling reuse.
Solution Approach 2:
An air gap acts as an intermediary barrier between the SERS substrate and the molecules to be detected. This intermediate space allows electromagnetic field penetration for signal enhancement while physically preventing molecule adsorption on the substrate surface, thus maintaining substrate cleanliness and reusability.
2Area of stationary object
If large-area nano-structured SERS substrates are manufactured, then detection coverage is improved, but manufacturing expenses increase extremely
Solution Approach 1:
The system separates the expensive SERS substrate from the molecule sample using an air gap and transparent layer structure. This allows using smaller, less expensive substrates while still achieving large detection coverage by maintaining the enhancement function without requiring large substrate areas.
Solution Approach 2:
The transparent layer (such as silicon oxide or silicon nitride) serves as a copy or substitute structure that maintains the functional interface between light and molecules without requiring the entire large-area substrate to be in direct contact with samples, reducing material costs.
3Ease of operation
If traditional direct absorption detection method is used, then detection simplicity is maintained, but substrate pollution occurs and usage cost increases significantly
Solution Approach 1:
By segmenting the detection system into substrate, air gap, and molecule layer components, the method maintains operational simplicity through standardized layer deposition processes while enabling substrate reuse, thus reducing long-term usage costs despite the added structural complexity.
Solution Approach 2:
The air gap structure enables recovery and reuse of the expensive SERS substrate after detection. The transparent layer with molecules can be removed or replaced while the substrate remains clean and reusable, implementing a recover-y model that reduces cumulative usage costs.
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
Enables clean and cost-effective reuse of SERS substrates by preventing molecule pollution, maintaining signal enhancement, and reducing operational costs.
Implementation Method 1
incident optical waves can excite local surface plasma resonance in nanostructures of the precious metals so as to amplify electromagnetic field in the local space for a plurality of orders of magnitude and enhance the Raman signals of the absorbed molecules
Implementation Method 2
at least one metal ring is deposited on a marginal surface of the SERS substrate, the at least one metal ring and the SERS substrate form a two-dimensional air cavity
Data Source
AI summary
The reusable SERS molecular test device includes two glass sheets, wherein a noble metal nano film is deposited on the surface of one of the glass sheets to form an SERS substrate, a metal ring is formed by depositing on an edge region of the SERS substrate by means of a coating process, and the metal ring fits with the SERS substrate to form a two-dimensional air chamber; and the other glass sheet, on which molecules under test are adsorbed and immobilized, is placed upside down on the metal ring, the thickness of the layer of the molecules under test being not greater than the thickness of the metal ring. The SERS molecular test device can fundamentally prevent the SERS substrate from being irreversibly contaminated by the molecules under test, so that the SERS substrate can be used in a cleaning-free and reusable manner.