Graphene Nanosensor with Marker for DNA Sequencing
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Solution Overview
Problem
Current methods for determining the order of DNA bases, such as the Maxam-Gilbert and Sanger methods, are time and effort-consuming, necessitating the development of a more efficient next-generation DNA sequencing technique.
Innovation Solution
The use of nanosensors incorporating graphene with a high electron mobility and resolution, featuring a marker system to identify the position of graphene layers or gaps, allowing for precise analysis of DNA bases with a resolution of less than 0.34 nm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional DNA sequencing methods (Maxam-Gilbert or Sanger) are used, then DNA base order can be determined, but the process is time and effort-consuming
Solution Approach 1:
The patent replaces traditional mechanical/chemical DNA sequencing methods with an electronic detection system using graphene nanogap sensors. The sensor detects DNA bases by measuring electrical current changes as DNA strands pass through the nanogap, substituting chemical cleavage and electrophoresis with electronic measurement, thereby dramatically reducing sequencing time and increasing productivity
Solution Approach 2:
The patent changes the detection parameter from chemical/physical separation to electrical current measurement. By monitoring current changes at the graphene nanogap as DNA bases pass through, the system transforms the sequencing process into an electrical measurement task, enabling faster and more efficient base identification
2Measurement precision
If graphene nanogap sensors are used to achieve high resolution DNA analysis, then measurement precision improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent introduces marker elements as intermediaries to bridge the gap between manufacturing limitations and measurement precision requirements. The markers serve as reference points that enable accurate positioning and identification of the nanogap location, allowing the system to achieve high measurement precision even with moderate manufacturing tolerances
Solution Approach 2:
The patent performs preliminary positioning by pre-forming marker elements that indicate the exact location where the nanogap should be created. This preliminary action guides subsequent nanogap fabrication, ensuring that the final sensor achieves the required precision for DNA base analysis
3Ease of operation
If marker elements are added to identify graphene position, then ease of operation improves, but device complexity increases
Solution Approach 1:
The patent uses marker elements with distinct physical or electrical characteristics (analogous to color changes) that make the graphene layer position easily identifiable. The markers provide visual or detectable signals that simplify the operation and alignment process, allowing users to quickly locate and work with the active sensing regions
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 efficient analysis of DNA bases with high precision and reduced time and effort, facilitating the measurement of DNA base order through advanced graphene nanogap or nanopore electrodes.
Implementation Method 1
nanosensors including graphene... electron mobility is high... one base of DNA may be analyzed
Data Source
AI summary
Nanosensors including graphene and methods of manufacturing the same. A nanosensor includes a first insulating layer in which a first nanopore is formed; a graphene layer that is disposed on the first insulating layer and having a second nanopore or a nanogap formed therein adjacent to the first nanopore; and a marker element that is disposed adjacent to the graphene layer and identifies a position of the graphene layer.