Nanostructure Biosensor Calibration via Electrical Normalization
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Solution Overview
Problem
Nanowire Field Effect Transistor (FET) sensors face challenges in achieving quantitative detection due to device-to-device variation in electrical parameters like threshold voltage and transconductance, limiting their competitiveness with state-of-the-art techniques and requiring individual calibration, which hampers multiplexing capabilities.
Innovation Solution
The development of nanostructure biosensors with uniform characteristics, such as consistent baseline current, transconductance, and threshold voltage, allows for quantitative detection by normalizing the initial current rate using baseline current or transconductance, enabling comparison across devices and generation of a universal calibration curve for analyte quantification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bottom-up or CVD grown nanowires are used for sensor fabrication, then sensor detection capability is achieved, but device-to-device variation in electrical parameters (threshold voltage, mobility, transconductance) increases
Solution Approach 1:
The patent applies parameter changes by normalizing sensor responses using measured electrical parameters (threshold voltage, mobility, transconductance) as normalization factors. This transforms the raw sensor data into a standardized format that compensates for device-to-device variations, enabling quantitative comparison across sensors fabricated by bottom-up or CVD methods.
Solution Approach 2:
The patent implements feedback by measuring the actual electrical parameters of each sensor device and using these measurements to adjust and normalize the sensor response. This closed-loop approach allows the system to account for manufacturing variations and achieve quantitative detection despite device-to-device variability.
2Measurement precision
If individual device calibration is performed to achieve quantitative analysis, then measurement precision is improved, but device complexity and calibration time increase
Solution Approach 1:
The patent applies self-service by enabling each sensor device to calibrate itself through automated measurement of its electrical parameters (threshold voltage, mobility, transconductance). The system uses these self-measured parameters to normalize its own response, eliminating the need for complex external calibration procedures while achieving quantitative analysis.
3Measurement precision
If individual device calibration is required for each sensor, then quantitative detection is achieved, but multiplexing capability is reduced
Solution Approach 1:
The patent applies universality by developing a standardized normalization protocol that can be applied to all sensor devices in an array. This universal approach allows multiple sensors to be calibrated and compared using the same electrical parameters (threshold voltage, mobility, transconductance), enabling quantitative detection across multiplexed sensor arrays without requiring individual calibration procedures for each device.
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 approach reduces device-to-device variability, enables reliable quantification of analyte concentrations, and allows for multiplexing by normalizing device signals, thereby enhancing the sensitivity and accuracy of nanostructure biosensors.
Implementation Method 1
Nanowire Field Effect Transistor (FET) sensor technology
Implementation Method 2
the nanosensor surface potential is changed due to the electric charge present on the bound molecule
Data Source
AI summary
The present invention relates to uniform nanostructure biosensors and methods of calibrating the response of nanostructure biosensors. The invention overcomes device to device variability that has made quantitative detection difficult. The described biosensors have uniform characteristics that allow for more reliable comparison across devices. The methods of the invention comprise normalizing the initial current rate, as measured by the nanostructure biosensor following the addition of an analyte, to device characteristics of the biosensor. The device characteristics of the biosensor which can be used to normalize the response include baseline current and transconductance, Calibration of responses allows for the generation of calibration curves for use in all devices to quantitatively detect an analyte, without the need for individual device calibration.