Carbon-Dot Capacitive Sensor Array for Continuous Pathogen Detection
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Solution Overview
Problem
Existing bacterial detection methods are limited by their inability to perform continuous monitoring, which is crucial for applications in healthcare, environmental monitoring, and homeland security, as they require manual sampling and ex situ analysis.
Innovation Solution
A capacitive artificial nose using carbon-dot-interdigitated electrode (C-dot-IDE) sensors that generate distinct capacitance signals for different bacterial strains, enabling continuous, real-time monitoring and discrimination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual sampling and ex situ analysis methods are used for bacterial detection, then measurement precision can be achieved, but continuous monitoring capability is lost
Solution Approach 1:
The sensor system performs automatic detection of bacterial volatile compounds without requiring manual sampling or external analysis equipment. The capacitive sensors continuously monitor VOCs in the environment, generating signals that directly indicate bacterial presence and growth, enabling the system to serve itself for continuous monitoring applications
Solution Approach 2:
The patent replaces manual mechanical sampling operations with automated electronic sensing. Instead of physically collecting samples and transporting them to analysis equipment, the system uses capacitive sensors to electronically detect and measure bacterial volatile compounds in real-time, substituting mechanical sampling with electronic detection
2Measurement precision
If vapor-based bacterial detection schemes are used, then bacterial identification can be achieved, but continuous monitoring is precluded
Solution Approach 1:
The capacitive sensor system enables continuous detection of bacterial volatile compounds without interruption. The sensors operate continuously in the environment, constantly measuring VOC concentrations and generating real-time signals that reflect ongoing bacterial growth and metabolic activity, maintaining uninterrupted monitoring capability
Solution Approach 2:
The sensor platform provides multiple functions: it identifies different bacterial species through their unique VOC profiles, quantifies bacterial growth levels, and operates continuously in real-time. This multi-functional capability allows a single system to achieve both precise identification and continuous monitoring productivity
3Measurement precision
If artificial nose platforms with multiple sensing mechanisms are used, then selectivity among different vapor molecules is improved, but device complexity increases
Solution Approach 1:
The system achieves selective detection of different bacterial volatiles by using an array of capacitive sensors with different surface properties. Each sensor in the array is segmented to respond to specific types of volatile compounds, and the combined signals from multiple segmented sensors enable discrimination of different bacterial species through pattern recognition
Solution Approach 2:
The patent varies the surface parameters of the capacitive sensors (such as surface chemistry, porosity, and material composition) to create different sensitivities to specific volatile compounds. By changing these parameters across the sensor array, the system achieves high selectivity without requiring complex sensing mechanisms for each individual sensor
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 C-dot-IDE sensors allow for non-invasive, continuous monitoring and identification of bacterial growth, enhancing safety measures in various environments by detecting volatile compounds from microbes.
Implementation Method 1
The C-dot-IDE capacitive artificial nose has been successfully applied for continuous monitoring and discriminating among bacteria
Implementation Method 2
Bacteria are known to emit varied volatile molecules, which types and concentrations are strain dependent
Data Source
AI summary
The present invention is directed to a sensing device including a plurality of capacitive sensors, each capacitive sensor comprises a sensing element electrically connected to electrodes and comprising carbon dots; the plurality of capacitive sensors comprises at least a first sensor, a second sensor and a third sensor; the carbon dots of the first sensor, the second sensor and the third sensor independently comprise hydrophilic surface groups, each independently comprising nitrogen and oxygen atoms; the hydrophilic surface groups of the carbon dots predetermine: (i) a different surface polarity; and (ii) a different sensitivity of the first sensor of the second sensor and of the third sensor to a volatile compound (VC). Further provided is a method of using the sensing device of the invention, such as for determining the presence of a microorganism of interest in a sample or at a target location.