Floating-Gate Transistor Molecule Detection
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Solution Overview
Problem
Current DNA detection methods are limited by the need for fluorescent labeling, complex sample preparation, and high operating expenses, and lack direct electronic indications of detection, making them cumbersome and difficult to interface with electronic devices.
Innovation Solution
The use of floating-gate transistors with electrolyte dielectrics to detect target molecules through changes in electrical properties, such as semiconductor conductance, without labeling, using a potentiometric approach that measures voltage changes across an ionic conducting electronic insulator, allowing for label-free, direct electronic readout of DNA hybridization or protein binding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If fluorescent labeling is used for DNA detection, then detection sensitivity is improved, but device complexity and sample preparation complexity increase
Solution Approach 1:
The invention extracts and eliminates the fluorescent labeling step from the detection process. Instead of using fluorescent labels to detect DNA, the device uses a field-effect transistor that directly transduces DNA binding events into electrical signals through changes in channel conductance, thereby simplifying both sample preparation and device operation while maintaining detection sensitivity
Solution Approach 2:
The invention replaces the optical detection system (fluorescence microscopy or flow cytometry) with an electrical detection system based on field-effect transistors. This substitution eliminates the need for optical components, fluorescent reagents, and complex optical alignment, while providing direct electronic readout that is easier to interface with modern electronic devices
2Measurement precision
If fluorescent labeling and optical detection are used, then molecule detection is achieved, but operating expenses and device portability are worsened
Solution Approach 1:
The invention replaces energy-intensive optical detection systems with low-power electrical measurements. Field-effect transistors require minimal power to operate and can be integrated with portable electronic devices, dramatically reducing operating expenses and enabling field-deployable point-of-care diagnostics
Solution Approach 2:
The invention uses inexpensive semiconductor materials and simple electronic components that can be mass-produced at low cost. The device architecture allows for disposable or single-use configurations that eliminate the need for expensive maintenance, calibration, and replacement of optical components
3Measurement precision
If fluorescent labeling is used for detection, then target molecules can be detected, but the method becomes cumbersome and difficult to interface with electronic devices
Solution Approach 1:
The invention replaces optical signal detection with direct electrical signal measurement. The field-effect transistor output is a standard electrical signal that can be directly interfaced with microcontrollers, smartphones, or other electronic devices, eliminating the need for complex optical detection systems and making the device easily integrable into modern electronic workflows
Solution Approach 2:
The invention creates a universal detection platform based on field-effect transistors that can detect various types of molecules (DNA, proteins, small molecules) by simply changing the recognition element on the gate. This universal architecture allows the same device to interface with different electronic systems and perform multiple detection functions
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
This method provides sensitive and selective detection of target molecules with minimal sample preparation, fast output, and the ability to detect various molecules, including nucleic acids and proteins, in a portable and cost-effective manner, avoiding the need for optical detection and electrochemical responses.
Implementation Method 1
an ionic conducting electronic insulator coupled to the semiconductor
Implementation Method 2
measuring voltage changes across an ionic conducting electronic insulator
Data Source
AI summary
The disclosure describes methods, devices, and system that measure chemisorption potentiometrically for detection of target molecules. In one example, a device includes a semiconductor, an ionic conducting electronic insulator coupled to the semiconductor, a floating gate electrode comprising a first portion and a second portion, the first portion being coupled to the semiconductor via the ionic conducting electronic insulator, an aqueous buffer, and a primary gate electrode coupled to the second portion of the floating gate electrode via the aqueous buffer. The second portion of the floating gate electrode may comprise a probe configured to react with a target chemical composition of a molecule to detect the presence of the molecule. Reaction with the target chemical composition may change an electrical property of the device and indicate the presence of the molecule in the aqueous buffer.