Biosensor with rGO and Gold Nanoparticles
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Solution Overview
Problem
Conventional biosensors face challenges with low production yield and high cost in mass-producing graphene, and the use of gold nanoparticles within organic layers leads to non-uniform dispersion and reduced sensor lifespan, making it difficult to enhance sensitivity and understand the charging effect.
Innovation Solution
A horizontal biosensor is developed using a reduced graphene oxide layer chemically bonded with a metal nanoparticle layer via a molecular linker, allowing for improved sensitivity and cost-effective production through spin coating and reduction methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If gold nanoparticles are physically included in or attached onto the organic layer, then sensitivity of the biosensor is improved, but uniform dispersion of AuNP in the organic layer becomes difficult and lifespan of the biosensor is reduced
Solution Approach 1:
The patent introduces an intermediary layer between the organic layer and gold nanoparticles to achieve stable bonding. This intermediary enables covalent attachment of AuNPs to the organic layer, ensuring uniform dispersion while maintaining biosensor lifespan and sensitivity through strong chemical bonds that prevent nanoparticle aggregation and detachment.
2Productivity
If conventional methods are used for mass production of graphene, then production can be achieved, but production yield is low and cost is high
Solution Approach 1:
The patent changes the production parameters by using chemical vapor deposition (CVD) method to grow graphene on copper foil, then transferring it to the substrate. This parameter change enables large-area, high-yield production with lower cost compared to conventional methods, while maintaining the required electrical and mechanical properties for biosensor applications.
3Measurement precision
If AuNP is used as sensitive element with organic layer, then sensitivity can be improved, but it becomes difficult to determine whether charging effect is due to AuNP, organic layer, or both
Solution Approach 1:
The patent segments the biosensor into distinct functional layers with clear interfaces: substrate, organic layer, and gold nanoparticle layer. This segmentation allows independent characterization of each layer's charging effect through controlled experiments, enabling identification of the specific source of charging effects while maintaining the sensitivity benefits of the AuNP-organic layer combination.
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 biosensor achieves superior charging effects and high sensitivity due to chemical bonding between reduced graphene oxide and gold nanoparticles, providing a clear explanation of the charging effect and enabling technical improvements.
Implementation Method 1
there has been developed a method in which oxidized graphite is produced to a graphene oxide (hereinafter, referred to as 'GO') nano-sheet and the GO is reduced to produce an rGO of high quality
Implementation Method 2
a reduced graphene oxide (rGO) layer and a metal nanoparticle layer which are chemically bonded by a molecular linker
Data Source
AI summary
The present invention relates to a horizontal biosensor, comprising a reduced graphene oxide layer formed on a substrate; a molecular linker formed on the reduced graphene oxide layer; and a metal nanoparticle layer formed on the molecular linker.