Polymer Single Nanowire Biosensor for BNP Detection
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Solution Overview
Problem
Current methods for producing single nanowires of uniform diameter are inefficient, resulting in non-uniform bundled nanowires, which hinders the development of reliable biomarker detection devices, particularly for monitoring cardiovascular disease biomarkers like B-type natriuretic peptide (BNP) outside healthcare settings due to lack of high sensitivity, selectivity, and cost-effectiveness.
Innovation Solution
A biomarker detection device utilizing a microfluidic biosensor with a biomarker functionalized polymer single nanowire connected to gold electrodes on a silicon wafer, coupled with a liquid electrolyte gate and tunable gate voltage, and software to report conductivity changes, enabling quantitative and qualitative BNP measurement with high sensitivity and specificity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If prior art methods are used to produce nanowires, then production can proceed with existing techniques, but the result is bundled nanowires of non-uniform width and quality
Solution Approach 1:
The patent segments the nanowire production process into distinct stages: template formation, electrochemical deposition, and template removal. This segmentation allows each stage to be optimized independently, achieving uniform nanowire diameters through controlled deposition while maintaining ease of manufacture through standardized procedures.
Solution Approach 2:
The patent introduces a porous template as an intermediary structure that guides nanowire formation. This template acts as a mediator between the deposition process and final nanowire structure, ensuring uniform diameter and preventing bundling while simplifying the overall manufacturing process through template-based control.
2Reliability
If single nanowires of uniform diameter are produced, then device reliability improves with consistent initial conductance, but mass production remains extremely difficult
Solution Approach 1:
The patent merges multiple functions into a single integrated process: the porous template serves simultaneously as a structural guide, a deposition mask, and a release mechanism. This combination enables mass production of uniform nanowires by eliminating the need for separate alignment and positioning steps.
Solution Approach 2:
The patent utilizes parameter changes in the electrochemical deposition process, specifically controlling voltage, current density, and deposition time, to achieve uniform nanowire growth across large areas. These parameter optimizations enable consistent production while maintaining high reliability through controlled initial conductance.
3Measurement precision
If nanowires are functionalized with antibodies for biomarker detection, then sensitivity and selectivity improve, but device complexity and cost increase
Solution Approach 1:
The patent performs preliminary functionalization of the nanowire surface with antibodies during the manufacturing process, before device assembly. This preliminary action simplifies the overall device complexity by eliminating post-fabrication functionalization steps and reduces costs through batch processing of multiple devices simultaneously.
Solution Approach 2:
The patent creates a universal nanowire platform that can be functionalized with different antibodies for various biomarkers using the same base structure and process. This multi-functionality approach reduces device complexity by maintaining a standardized platform while achieving high measurement precision for different applications through antibody selection.
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 device allows for sensitive and specific detection of BNP levels, potentially enabling early monitoring of cardiovascular disease outside healthcare settings, reducing hospitalization costs and improving patient care through cost-effective and simple assays.
Implementation Method 1
the polymer single nanowire coupled to a gate electrode by a liquid electrolyte gate
Implementation Method 2
the resistance to electrical current through them changes when the nanowire is in the presence of the molecule of interest
Data Source
AI summary
A biomarker detection device comprising: a microfluidic biosensor further comprising a biomarker functionalized polymer single nanowire connecting a pair of gold electrodes on a silicon wafer; the biomarker functionalized polymer single nanowire s coupled to a gate electrode by a liquid electrolyte gate; and a tunable gate voltage connected to the gate electrode.