Carboxyl-Modified MoS2 Biosensing Chip SPR Sensitivity
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Solution Overview
Problem
Conventional biological detection devices using surface plasmon resonance technology have limitations in sensitivity, necessitating an enhancement in biosensing chip design to improve detection accuracy.
Innovation Solution
A biosensing chip comprising a transparent substrate with a metal layer and a carboxyl-modified molybdenum disulfide layer, which enhances the sensitivity of the detection device by modifying the molybdenum disulfide layer through methods like oxalic acid or monochloroacetic acid treatment, and integrating it with a gold film and chromium or titanium films for optimal performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional transparent substrate with metal layer is used for SPR sensing chip, then the device structure is simple and easy to manufacture, but the sensitivity and molecular affinity are insufficient
Solution Approach 1:
The patent applies composite materials by combining transparent substrate, metal layer (gold, silver, or aluminum), and molybdenum disulfide layer to create an SPR sensing chip with enhanced sensitivity. The molybdenum disulfide layer, with its unique two-dimensional structure and high surface area, complements the metal layer's plasmonic properties, resulting in a composite structure that achieves superior molecular affinity and detection sensitivity while maintaining practical manufacturability
Solution Approach 2:
The patent utilizes parameter changes by modifying the optical properties of the sensing chip through the introduction of molybdenum disulfide layer. This layer changes the refractive index profile and enhances the evanescent field interaction with analytes, thereby improving the sensitivity parameter without fundamentally altering the basic SPR chip architecture, allowing for enhanced performance with moderate structural complexity
2Measurement precision
If conventional SPR sensing chip without molybdenum disulfide is used, then the manufacturing process is simpler, but the detection accuracy and molecular binding affinity are lower
Solution Approach 1:
The patent applies preliminary action by pre-modifying the molybdenum disulfide layer with carboxyl groups before the actual sensing process. This pre-functionalization step creates ready-to-use binding sites for molecular recognition, enhancing detection accuracy and molecular binding affinity while streamlining the overall manufacturing process by preparing the sensing surface in advance
Solution Approach 2:
The patent uses carboxyl-modified molybdenum disulfide as an intermediary layer between the metal layer and the target molecules. This intermediary layer provides enhanced molecular affinity and specific binding capabilities, improving detection accuracy while maintaining ease of manufacture through standardized modification protocols
3Measurement precision
If standard metal layer without molybdenum disulfide is used, then the chip structure is simpler, but the SPR resonance signal strength is weaker
Solution Approach 1:
The patent applies local quality by introducing molybdenum disulfide specifically at the sensing interface where molecular interaction occurs. This localized enhancement of the layer structure provides stronger SPR resonance signal strength at the critical detection zone without unnecessarily complicating the entire chip structure, achieving improved signal strength with moderate structural complexity
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 carboxyl-modified molybdenum disulfide layer significantly increases the sensitivity of the biosensing chip, demonstrated by higher SPR resonance angles and regression coefficients compared to traditional SPR chips, indicating improved molecular affinity and detection capabilities.
Implementation Method 1
detecting by surface plasmon resonance (SPR) as to how well specific biological molecules or gas molecules in micro-channels on surfaces of biomedical chips are bound to the chips
Data Source
AI summary
A molybdenum disulfide-containing biosensing chip includes a transparent substrate; a metal layer disposed on the transparent substrate; and a molybdenum disulfide layer disposed on the metal layer; wherein the molybdenum disulfide layer is carboxyl (—COOH)-modified. The carboxyl (—COOH)-modified molybdenum disulfide layer effectively enhances sensitivity of a detection device having the biosensing chip. The biosensing chip is applicable to detection of various biological molecules.