Graphene FET Biosensor Detection for Rapid Pathogen Screening
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Solution Overview
Problem
Current diagnostic methods lack reliable, fast, and inexpensive at-home or point-of-care devices for detecting pathogens like SARS-CoV-2, which are essential for real-time pandemic monitoring and global health management.
Innovation Solution
A portable biosensor device using a graphene field-effect transistor (FET) chip with aptamers that specifically bind to viral antigens, proteins, RNA, or DNA, enabling rapid and sensitive detection of pathogens in health and environmental samples, with wireless data transmission capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional diagnostic methods are used for pathogen detection, then detection can be performed with existing infrastructure, but the methods are slow, expensive, and not suitable for at-home or point-of-care use
Solution Approach 1:
The patent replaces complex mechanical and chemical diagnostic systems with an electronic field-effect transistor-based detection system. The FET sensor electronically detects pathogen presence through electrical signal changes when pathogens bind to surface receptors, eliminating the need for complex mechanical processing, reagents, and laboratory equipment while maintaining high detection reliability
Solution Approach 2:
The patent changes the detection parameter from optical or chemical measurements to electrical field measurements. By monitoring changes in electrical conductance or capacitance of the FET when pathogens bind to the sensor surface, the system achieves rapid, reliable detection that is both simple to operate and highly accurate
2Speed
If rapid detection is implemented to enable real-time pandemic monitoring, then response time is reduced, but detection sensitivity and specificity may be compromised
Solution Approach 1:
The patent transitions from traditional one-dimensional detection methods to multi-dimensional sensing by utilizing the FET's ability to detect multiple electrical parameters (conductance, capacitance, impedance) simultaneously. This multi-dimensional electrical measurement approach provides both rapid response and high precision by analyzing multiple signal characteristics that confirm pathogen presence with high specificity
Solution Approach 2:
The sensor surface is pre-functionalized with specific receptor molecules that are ready to bind target pathogens immediately upon sample application. This preliminary preparation of the sensing surface with high-affinity binding receptors enables both rapid detection (within minutes) and high sensitivity/specificity, as the pre-positioned receptors can instantly capture and specifically identify target pathogens without requiring additional preparation steps
3Ease of manufacture
If inexpensive diagnostic devices are developed for widespread deployment, then cost is reduced, but manufacturing precision and device reliability may suffer
Solution Approach 1:
The patent divides the diagnostic system into separate functional modules: a simple FET sensor chip, a sample application component, and a readout device. This segmentation allows each component to be manufactured independently using standard, cost-effective processes while maintaining overall device precision. The FET chip itself can be fabricated using conventional semiconductor manufacturing techniques that are both precise and scalable for mass production
Solution Approach 2:
The FET-based sensor platform is designed as a universal detection system that can identify multiple different pathogens by simply changing the surface receptor coating, rather than requiring different hardware for each pathogen type. This universality reduces manufacturing costs through standardization while maintaining high precision through the inherent sensitivity of the FET electrical measurement system
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 device provides highly specific and sensitive pathogen detection within minutes, suitable for global health and security applications, with the ability to detect low concentrations and potential mutations, and supports early warning systems for biological threats.
Implementation Method 1
one or more probes, which are attached to the graphene surface, specifically bind to one or more target molecules of the one or more pathogens
Implementation Method 2
using field-effect transistors and aptamers to accurately detect a virus and its molecular components
Data Source
AI summary
Methods, systems and devices for detecting the presence of a pathogen, for example, a virus (e.g., SARS-CoV-2), or its molecular components, in health care-related samples and/or environmental samples are disclosed. An example system for improving detection of a pathogen includes biosensor device comprising a detection chip and at least one probe that specifically recognizes a pathogen, where the detection chip comprises a graphene field-effect transistor (FET) chip and the probe, which comprises an aptamer, specifically binds to a DNA, RNA, or protein associated with the pathogen.