Planar DNA Sensor With Electret Layer for Passive Strand Detection
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Solution Overview
Problem
Existing methods for detecting DNA-like molecules, such as cDNA/DNA/RNA, are inefficient, costly, and require laboratory equipment and trained personnel, making them unsuitable for mass-scale applications, particularly in fields like personalized treatments and microbiome analysis.
Innovation Solution
A multilayered, planar sensor device that operates passively without a power source, utilizing an electret layer to attract negatively charged DNA strands to a sensing layer, where they interact with conductive elements to measure physical changes, and is manufactured using roll-to-roll technology for cost-effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional DNA detection methods (gel electrophoresis, fluorescent dyes) are used, then detection accuracy is achieved, but device complexity and cost increase significantly
Solution Approach 1:
The sensor is divided into multiple functional layers: a solution layer for sample preparation, a sensing layer with conductive elements for detection, and an electret layer for particle attraction. Each layer performs a specific function, allowing complex DNA detection to be achieved through simple, modular components rather than a single complex device
Solution Approach 2:
The electret layer acts as an intermediary that attracts negatively charged DNA particles to the sensing layer without requiring complex mechanical or electronic systems. This passive attraction mechanism simplifies the overall device while maintaining detection capability
2Reliability
If traditional DNA detection methods are used, then reliable detection is achieved, but loss of time and operational efficiency worsen
Solution Approach 1:
The solution layer contains pre-loaded chemical solutions that automatically break down biological samples into DNA strands upon contact. This preliminary action occurs passively without requiring external power or active processing, enabling rapid sample preparation and reducing overall detection time while maintaining reliability
Solution Approach 2:
The sensor performs sample processing, particle attraction, and detection automatically through passive physical and chemical processes. The electret layer self-generates electric fields to attract DNA particles, and the conductive elements automatically detect changes when DNA binds, eliminating the need for complex operational procedures and reducing time loss
3Ease of operation
If passive operation without power source is implemented, then ease of operation and cost decrease, but device functionality is limited
Solution Approach 1:
The sensor detects DNA by measuring changes in electrical parameters (capacitance, conductance) of the conductive elements when DNA particles bind to them. This parameter-based detection approach maintains versatility for detecting different DNA sequences while operating passively, as the fundamental detection mechanism remains the same regardless of the specific DNA target
Solution Approach 2:
The sensor design with conductive elements and electret layer provides a universal platform for DNA detection that can be adapted to detect different DNA sequences by changing the probe molecules on the conductive elements. The passive operation mechanism remains unchanged, allowing the same simple device structure to serve multiple detection purposes
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 low-cost, disposable, and efficient detection of specific DNA sequences without specialized equipment, facilitating applications in personalized beauty and microbiome analysis by isolating and identifying DNA strands using passive principles.
Implementation Method 1
an electret layer to attract negatively charged DNA strands to a sensing layer
Data Source
AI summary
A multilayered sensor device for detecting DNA or DNA-like strands within a biological sample includes: a planar electret layer having a positive pole; a sensing layer configured above the electret layer including a plurality of sensors comprising pairs of conductive elements with gaps therebetween, wherein strands of single-stranded DNA of the sensor are configured within the gaps, wherein the strands of single-stranded DNA of the sensor within the gaps are configured to couple with strands of single-stranded DNAfrom the biological sample; and a solution layer configured above the sensing layer, said solution layer comprising chemical solutions for breaking down a biological sample into DNA strands. The positive pole is arranged relative to the sensing layer and solution layer such that, following breakdown of the biological sample into DNA strands, the positive pole draws strands of single-stranded DNA through the solution layer and to the sensing layer.