Ring-Shaped SERS Substrate for Nanoparticle Positioning
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Solution Overview
Problem
Existing surface enhanced Raman scattering (SERS) sensors with random metal nanoparticle structures face challenges in reproducibility and accuracy due to undefined localized surface plasmon resonance (LSPR) hot spots, hindering quantitative analysis.
Innovation Solution
A method for manufacturing a transparent substrate with a ring-shaped pattern using a photoresist layer and a plate-type metal dot photo mask, allowing for controlled formation of micro wells with concavely curved bottoms to precisely position and density metal nanoparticles, enhancing the reproducibility and reliability of SERS substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If metal nanoparticles are arranged randomly in conventional SERS sensors, then the structure is simple to manufacture, but the position and density of hot spots are undefined, leading to poor reproducibility and accuracy
Solution Approach 1:
The substrate is segmented into multiple ring-shaped transparent protrusions, each serving as an independent unit to confine and position metal nanoparticles. This segmentation allows precise control over nanoparticle distribution while maintaining manufacturing feasibility through standardized ring structures
Solution Approach 2:
The ring-shaped transparent protrusions are pre-formed on the substrate before metal nanoparticle deposition. This preliminary structuring creates predetermined zones that guide nanoparticle positioning and hot spot formation, ensuring reproducibility without requiring complex post-processing
2Reliability
If a transparent substrate with ring-shaped protrusions is used to control hot spot position, then reproducibility and accuracy improve, but the manufacturing process becomes more complex
Solution Approach 1:
The patent replaces complex mechanical nanoparticle positioning systems with a optical-field-based approach. The ring-shaped transparent protrusions utilize localized surface plasmon resonance and optical field distribution to naturally concentrate and position metal nanoparticles, achieving precise hot spot formation without complex mechanical positioning mechanisms
Solution Approach 2:
The patent optimizes specific parameters of the ring-shaped protrusions (inner diameter, outer diameter, height) to control the optical field distribution and nanoparticle positioning. By adjusting these geometric parameters, precise hot spot formation is achieved while maintaining a relatively simple manufacturing process
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 method enables the creation of SERS substrates with defined hot spots, improving reproducibility and allowing for quantitative analysis by accurately controlling the position and density of metal nanoparticles, thereby enhancing the analytical efficiency and precision of optical characteristic detection.
Implementation Method 1
exposing the photoresist layer and developing the exposed photoresist layer
Implementation Method 2
a phenomenon that Raman scattering intensity is suddenly increased over 106 to 108 times when molecules are adsorbed to a surface of a metal nano structure such as gold and silver
Implementation Method 3
filling a liquefied transparent resin in the second mold and curing the transparent resin
Data Source
AI summary
Provided is a method for manufacturing a transparent substrate according to an exemplary embodiment of the present invention including: a) forming a photoresist layer satisfying D=m*(.lamda./2n); b) manufacturing a ring-shaped pattern by exposing the photoresist layer and developing the exposed photoresist layer, using a photo mask including a transparent base and a plate-type metal dot formed contacting a light emitting surface of the transparent base; c) manufacturing a second mold to which the ring-shaped pattern is reversely transferred by using a substrate on which the ring-shaped pattern is formed as a first mold; and d) manufacturing the transparent substrate in which a ring-shaped transparent protrusion is integrally formed with the transparent base by filling a liquefied transparent resin in the second mold and curing the transparent resin and removing the second mold to transfer the ring-shaped pattern.