LSPR Interferometer for Lead Ion Detection
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Solution Overview
Problem
Current methods for detecting trace lead ions in water are either time-consuming, require expensive equipment, or are not suitable for on-site monitoring due to the need for DNA oligonucleotides, which have storage and operational limitations, and existing label-free techniques like SPR are not sensitive enough for detecting lead ions.
Innovation Solution
An optochemical detector using a localized surface plasmon resonance interferometer with gold nanoislands and a synthetic ionophore receptor, such as poly(m-phenylenediamine-co-Aniline-2-sulfonic acid), that alters light signals in response to lead ions, allowing for label-free, subnanomolar detection without DNA oligonucleotides, enabling rapid and portable on-site monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional chemical testing approaches are used, then the detection process is simple, but the detection speed is slow and time-consuming
Solution Approach 1:
The patent replaces traditional chemical testing methods with an optical detection system based on localized surface plasmon resonance (LSPR). The LSPR sensor uses optical fields to detect lead ions, substituting chemical reactions with physical optical measurements, thereby achieving both simplicity and rapid detection without time-consuming chemical procedures
Solution Approach 2:
The patent changes the detection parameter from chemical reaction-based measurements to optical parameter measurements (resonance wavelength, intensity, or phase changes). By monitoring changes in optical properties when lead ions bind to the sensor surface, the system achieves rapid detection while maintaining operational simplicity
2Measurement precision
If material characterization techniques in laboratories are used, then the detection accuracy is high, but the equipment cost is expensive and not suitable for daily applications
Solution Approach 1:
The patent extracts the essential detection function from complex laboratory equipment and concentrates it into a compact LSPR sensor system. By using a miniaturized sensor with integrated optical components, the system achieves laboratory-grade detection accuracy in a portable, cost-effective device suitable for field deployment
Solution Approach 2:
The patent creates a simplified version of laboratory characterization techniques through the LSPR sensor, which replicates the high sensitivity and accuracy of lab equipment using optical principles. The sensor effectively copies the detection capability of complex instruments in a much simpler, more affordable platform
3Measurement precision
If DNA oligonucleotides are used for detection, then the detection specificity is high, but the storage and operational conditions are limited
Solution Approach 1:
The patent replaces DNA oligonucleotides with a synthetic ionophore receptor that forms part of a polymer coating on the LSPR sensor. This synthetic receptor is more stable, does not require stringent storage conditions, and can be directly integrated into the sensor structure, eliminating the need for separate DNA components and their associated storage requirements
Solution Approach 2:
The patent uses a composite polymer coating containing synthetic ionophore receptors embedded in the polymer matrix. This composite material provides both high detection specificity for lead ions and improved stability compared to DNA-based systems, while maintaining ease of operation without special storage conditions
4Ease of manufacture
If existing label-free techniques like SPR are used, then the detection is simple, but the sensitivity is not enough for detecting lead ions
Solution Approach 1:
The patent transitions from bulk surface plasmon resonance (SPR) to localized surface plasmon resonance (LSPR) by using nanoscale metal structures. This localization concentrates the optical field at specific points, enhancing the interaction with target molecules and significantly improving sensitivity while maintaining the simplicity of label-free detection
Solution Approach 2:
The patent employs a polymer coating with porous or nanostructured morphology on the LSPR sensor surface. This porous structure increases the surface area and provides more binding sites for lead ions, thereby enhancing detection sensitivity while maintaining the label-free approach and operational simplicity
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 detector achieves a subnanomolar detection limit for lead ions, two orders of magnitude better than the WHO guideline, with improved robustness, reduced material costs, and enhanced operational conditions, facilitating effective on-site monitoring of lead ions in water.
Implementation Method 1
the probe cell unit comprises a localized surface plasmon resonance interferometer
Implementation Method 2
the localized surface plasmon resonance interferometer is arranged to introduce a change of the phase of the light signal
Implementation Method 3
the ionophore receptor includes poly(m-phenylenediamine-co-Aniline-2-sulfonic acid) arranged to selectively bind with the target substance
Implementation Method 4
the ion-selective unit is arranged to change a local refractive index of the probe cell unit
Implementation Method 5
the light detection unit comprises a linear array detector arranged to record an output result associated with a spectral interference fringe
Data Source
AI summary
An optochemical detector and a method for fabricating an optochemical detector includes a light generation unit arranged to emit a light signal; a probe cell unit arranged to alter at least one physical characteristic of the light signal in response to an interaction with a target substance; and a light detection unit arranged to receive the light signal altered by the probe cell unit; wherein a detection of the target substance is characterized by a change in the at least one physical characteristic altered by the probe cell unit.