Electrochemical Biosensor Nanowell Arrays for fM Analyte Detection
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Solution Overview
Problem
Current electrochemical biosensors lack the ability to detect multiple analytes present in femtomolar (fM) concentrations with high selectivity and are not cost-effectively producible in large scales for broad applications.
Innovation Solution
The development of electrochemical biosensors with a perforated insulation layer forming nanowells on electrodes, allowing for enhanced sensitivity and selectivity, includes a buffer layer, electrode layer, and insulator layer configuration, enabling detection of analytes in the fM range, with specific embodiments using glass or silicon substrates, titanium or chromium buffer layers, and silicon dioxide or nitride insulator layers, and capable of operating with electronic devices for signal detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional electrochemical biosensors are used, then the device structure is simple and manufacturing cost is low, but the sensitivity and selectivity for detecting multiple analytes in fM range are insufficient
Solution Approach 1:
The electrode surface is segmented into multiple independent nanowell arrays, where each nanowell contains isolated binding sites for different analytes. This segmentation enables simultaneous detection of multiple analytes with high selectivity while maintaining a relatively simple overall device structure that can be manufactured at scale.
Solution Approach 2:
Different regions of the electrode surface are赋予 different functional properties through the perforated insulator layer, creating localized binding zones with specific affinities for different analytes. This local differentiation enhances measurement precision for multiple analytes without requiring complete redesign of the entire sensor system.
2Quantity of substance
If conventional electrochemical biosensors are used, then the manufacturing process is simple and cost-effective, but the ability to detect multiple analytes in fM range with high selectivity is lacking
Solution Approach 1:
The biosensor platform is designed with universal nanowell structures that can detect multiple different analytes using the same fundamental detection mechanism. This multi-functionality allows the sensor to detect various analytes in the fM range while maintaining compatibility with existing manufacturing processes, ensuring ease of large-scale production.
Solution Approach 2:
The sensor utilizes changes in electrochemical parameters (current, voltage) in response to analyte binding events within nanowells. By monitoring these parameter changes, the sensor achieves fM-level detection sensitivity while the underlying measurement principle remains compatible with conventional electrochemical manufacturing techniques.
3Area of stationary object
If the electrode surface is made larger to increase detection capacity, then more analytes can be detected, but the selectivity and sensitivity for individual analytes decreases
Solution Approach 1:
Instead of using a single large electrode surface, the detection area is divided into numerous small nanowells arranged in arrays. Each nanowell acts as an independent detection unit with high local concentration of binding sites, maintaining high sensitivity and selectivity while the collective array provides large total detection capacity.
Solution Approach 2:
The sensor transitions from a two-dimensional planar electrode surface to a three-dimensional nanowell structure. This dimensional change allows the electrode to provide both large total surface area for high-capacity detection and small local well volumes for high sensitivity and selectivity, simultaneously resolving the contradiction between detection capacity and precision.
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
These biosensors demonstrate improved sensitivity and selectivity, capable of detecting analytes in the fM range, with resilient and stable components reducing manufacturing costs and enabling wide-ranging applications, including medical and environmental testing.
Implementation Method 1
electrochemical biosensors use the principle of electrochemical analysis to detect specific analytes, where chemical response to an electrical excitation applied to a system is measured and analyzed
Data Source
AI summary
Electrochemical biosensor devices and methods of using such devices are provided for detecting low concentration of an analyte in a biological fluid sample. One exemplary embodiment of an electrochemical biosensor device includes a plurality of electrodes made of a buffer layer laid on a substrate layer, an electrode layer laid on the buffer layer, and a perforated insulator layer laid on the electrode layer, such that a plurality of nanowells are formed on the electrode layer and the dimensions of the nanowells are defined by the sizes of the perforations, walls of the nanowells are defined by the insulator layer, and the bottom floors of the nanowells are defined by an upper surface of the electrode layer. In some instances, the nanowells of the biosensors have a pitch ratio of 1:1. In other instances, the biosensors can detect analytes that are present in fM concentration range.