Fe3O4@FeOOH Nanozyme for Pb2+ Detection
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Solution Overview
Problem
Current methods for detecting Pb2+ ions, such as colorimetric probes, face challenges with sensitivity and recovery of nanomaterials used in SERS, leading to weak signal enhancement and difficulty in detecting trace substances effectively.
Innovation Solution
A nanozyme material composed of iron-doped carbon dots and Prussian blue (PB) with gold nanoparticles (Fe,NA/CDs-PB@AuNPs) is developed, which exhibits both peroxidase activity and Raman enhancement, enabling dual-mode detection through colorimetric assays and SERS, providing high sensitivity and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If nanomaterials are prepared into SERS substrates with oxidase-like activities, then detection speed and sensitivity are improved, but the nanomaterials disperse into solution causing weak SERS enhancement and difficulty in recovery
Solution Approach 1:
The patent uses magnetic Fe3O4 nanoparticles as a core that can be easily separated from solution through magnetic field application. The Fe3O4@FeOOH core-shell structure provides a stable platform that prevents nanoparticle aggregation while maintaining SERS activity, enabling both high detection sensitivity and easy recovery of the nanomaterials.
2Measurement precision
If signal amplification is used to achieve ultra-sensitive determination of Pb2+, then detection sensitivity is improved, but the complexity of the detection system increases
Solution Approach 1:
The patent combines multiple functions into a single integrated nanoplatform: Fe3O4 provides magnetic separation, FeOOH shell provides peroxidase-like catalytic activity for signal amplification, and the structure serves as a SERS substrate. This merging of functions achieves ultra-sensitive Pb2+ detection without requiring multiple separate amplification systems, thus maintaining operational simplicity.
Solution Approach 2:
The FeOOH shell exhibits strong peroxidase-like catalytic activity that accelerates the oxidation of TMB substrate in the presence of H2O2, generating a amplified colorimetric signal and Raman signal. This strong oxidant capability enables ultra-sensitive detection while keeping the system simple, as the catalytic amplification occurs automatically upon addition of substrates.
3Ease of operation
If colorimetric probe method is used for Pb2+ detection, then operational simplicity is improved, but detection sensitivity and reliability are insufficient
Solution Approach 1:
The nanoplatform provides dual-mode detection capability: colorimetric assay for simple operation and SERS for high sensitivity and reliability. The same Fe3O4@FeOOH nanomaterial serves both as a catalyst for colorimetric reaction and as a SERS substrate, allowing users to choose the appropriate detection mode based on their needs while maintaining ease of operation.
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 nanozyme material allows for rapid and accurate detection of Pb2+ ions with improved sensitivity and reliability, as the dual-mode detection results are complementary and consistent, enhancing the detection accuracy and precision.
Implementation Method 1
FeOOH shell provides peroxidase-like catalytic activity for signal amplification
Implementation Method 2
accelerates the oxidation of TMB substrate in the presence of H2O2
Implementation Method 3
In surface-enhanced Raman spectroscopy (SERS), a Raman signal of a target substance is greatly enhanced with a precious metal material such as gold and silver
Implementation Method 4
The patent uses magnetic Fe3O4 nanoparticles as a core that can be easily separated from solution through magnetic field application
Implementation Method 5
To achieve the ultra-sensitive determination of Pb2+, signal amplification is often required in studies to achieve excellent sensitivity and low detection limits
Data Source
AI summary
A nanozyme material and a preparation method thereof are provided. In the preparation method, Prussian blue (PB) is used to regulate the peroxidase activity of Fe,NA/CDs, and then gold nanoparticles are synthesized with Fe,NA/CDs as a reducing agent and a stabilizing agent. The nanozyme material has both a peroxidase activity and a Raman enhancement effect, which can be used for nanozyme-based surface-enhanced Raman spectroscopy (SERS). An embodiment of the present disclosure also provides a method for rapidly detection of a Pb2+ ion, which is based on a color change or an additional Raman SERS signal generation caused by nanozyme oxidation. Such sensing signals (colorimetric and SERS analysis) are derived from a catalytic oxidation reaction of ABTS or TMB, while the presence of Pb2+ specifically inhibits the oxidation, such that the rapid detection of Pb2+ can be achieved.