Graphene Quantum Point Contact Nanopore for DNA Sequencing
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Solution Overview
Problem
Current genome sequencing technologies face challenges in achieving low-cost, high-speed, and accurate biomolecule sensing, particularly in differentiating individual nucleotides during DNA translocation through nanopores, due to thermal fluctuations and screening effects from ions and solvent.
Innovation Solution
A graphene-based nanopore device with a quantum point contact (QPC) geometry, where the shape, size, and position of the nanopore, along with modulated carrier concentration, enhance conductance sensitivity to detect DNA translocation and conformational changes, allowing for precise nucleotide detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional nanopore sequencing is used, then DNA translocation can be achieved, but thermal fluctuations and ion screening effects reduce measurement precision
Solution Approach 1:
The patent modulates the carrier concentration in the graphene QPC to optimize conductance sensitivity. By changing the electrical parameters of the detection system (gate voltage, carrier density), the device achieves enhanced sensitivity to DNA translocation while maintaining operation in the presence of thermal fluctuations and ionic environments
Solution Approach 2:
The patent replaces conventional ionic current measurement with electronic conductance measurement in graphene. This substitution of measurement mechanism exploits the unique electronic properties of graphene QPC, which provides superior signal-to-noise ratio and is less susceptible to thermal and ionic interference compared to traditional nanopore methods
2Measurement precision
If graphene QPC geometry is optimized, then conductance sensitivity increases, but device complexity increases
Solution Approach 1:
The patent introduces a localized quantum point contact geometry within the graphene sheet, creating a specific regional structure with enhanced electronic properties. The QPC region is precisely positioned and dimensioned to maximize conductance modulation by DNA, while the rest of the graphene maintains its intrinsic properties
Solution Approach 2:
The patent employs dynamic control of carrier concentration through gate voltage modulation, allowing the QPC to operate at optimal sensitivity points. The system can adapt its electrical characteristics in real-time to maintain maximum detection sensitivity under varying experimental conditions
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 graphene QPC device demonstrates significant conductance variations during DNA translocation, enabling the detection of individual nucleotides and conformational changes, improving the signal-to-noise ratio and sensitivity for genome sequencing applications.
Implementation Method 1
the shape, size, and position of the nanopore, along with modulated carrier concentration, enhance conductance sensitivity to detect DNA translocation
Implementation Method 2
modulated carrier concentration, enhance conductance sensitivity to detect DNA translocation and conformational changes
Data Source
AI summary
Aspects of the subject disclosure may include, for example, an apparatus having a material having a through-hole, a gate coupled to the material for controlling a charge concentration of the material, a sensor, and a controller coupled to the material, the gate and the sensor. The controller can perform operations including applying a first voltage potential to the material to induce a flow of current in the material, applying a second voltage potential to the gate to adjust the charge concentration of the material, and receiving sensing data from the sensor responsive to a change in electrical properties of the material caused by a target traversing the first through-hole of the material. The through-hole causes a plurality of structural portions of the target to be misaligned with a direction of the flow current in the material. Additional embodiments are disclosed.