Nanogap Device DNA Base Differentiation via Segmented Electrodes
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current DNA detection methods using nanogap systems face challenges in distinguishing between DNA bases due to the fast movement of molecules and small signal sizes, making it difficult to differentiate between the four different DNA bases with a 0.37 nm interval.
Innovation Solution
A nanogap device structure is developed, comprising a first insulation layer with a nanopore, a graphene-based nanogap electrode, and semiconductor layers, where the nanogap electrode is divided into two parts with a narrow gap facing the nanopore, allowing for the measurement of drain current signals and their synchronization to amplify or detect error signals, facilitating the differentiation of DNA bases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If DNA molecules move through the nanogap at ultrahigh speed (10^7 base/sec or higher), then the detection process is fast, but the signal detection becomes difficult and existing electrical signal detecting methods cannot distinguish four different DNA bases having an interval of 0.37 nm
Solution Approach 1:
The nanogap electrode is divided into two separate parts (first nanogap electrode and second nanogap electrode) with a gap between them, creating multiple detection zones. This segmentation allows for enhanced signal differentiation by measuring changes in electrical properties as DNA passes through each zone, enabling distinction between different DNA bases despite high translocation speeds
Solution Approach 2:
The patent introduces a vertical stacking dimension by placing nanogap electrodes and semiconductor layers in multiple tiers (first and second sets). This three-dimensional arrangement creates multiple measurement planes that can detect DNA bases from different spatial perspectives, improving the ability to distinguish between bases at high translocation speeds
2Device complexity
If the signal from the nanogap is small, then the device structure can be simple, but signal detection becomes difficult
Solution Approach 1:
The patent combines multiple functional components into an integrated nanogap device structure: nanogap electrodes are merged with semiconductor layers (graphene and other semiconductor materials) to form a unified detection system. This merging amplifies the small signals generated at the nanogap by utilizing the semiconductor properties of the integrated structure, making detection feasible without significantly increasing device complexity
Solution Approach 2:
The patent employs composite material structures combining graphene layers with other semiconductor materials in the nanogap electrode assembly. These composite materials enhance the electrical signal generation and detection capabilities, allowing small signals from DNA translocation to be effectively amplified and detected while maintaining a relatively simple overall device structure
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 nanogap device effectively amplifies small electrical signals generated by DNA passing through the nanogap, enabling the precise differentiation of DNA bases by synchronizing and processing drain current signals, thereby improving DNA detection sensitivity.
Implementation Method 1
a system for measuring a tunneling current or a blockade current when a DNA, a ribonucleic acid (RNA), or the like passes through a nanogap
Implementation Method 2
a system for measuring a tunneling current or a blockade current when a DNA, a ribonucleic acid (RNA), or the like passes through a nanogap
Data Source
AI summary
A nanogap device includes a first insulation layer having a nanopore formed therein, a first nanogap electrode which may be formed on the first insulation layer and may be divided into two parts with a nanogap interposed between the two parts, the nanogap facing the nanopore, a second insulation layer formed on the first nanogap electrode, a first graphene layer formed on the second insulation layer, a first semiconductor layer formed on the first graphene layer, a first drain electrode formed on the first semiconductor layer, and a first source electrode formed on the first graphene layer such as to be apart from the first semiconductor layer.