Triethylamine-Modified Graphene Sensor for Real-Time Nitrate Detection
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Solution Overview
Problem
Conventional methods for measuring nitrate nitrogen in water are costly, require complex pretreatment, and lack real-time monitoring capabilities, especially in field settings, due to their reliance on chemical reactions and biological identification.
Innovation Solution
A graphene sensor with a functionalized graphene film modified using triethylamine is developed, featuring a substrate and electrode layer, allowing for low-cost, real-time, and in-situ measurement of nitrate nitrogen with high chemical stability and specificity, even in the presence of interfering ions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional optical methods are used to measure nitrate nitrogen, then measurement capability is achieved, but the process requires complex pretreatment and chemical reagents, making it unsuitable for on-site real-time monitoring
Solution Approach 1:
The patent extracts the essential measurement function from complex optical methods and concentrates it into a simple graphene-based FET sensor that directly detects nitrate nitrogen without requiring pretreatment processes or chemical reagents, enabling on-site real-time monitoring
Solution Approach 2:
The patent replaces the optical measurement system with an electrical field-based FET sensor system, where the graphene film detects nitrate nitrogen through electrical signal changes rather than optical signals, eliminating the need for complex optical pretreatment processes
2Reliability
If biological identification methods are used in FET sensors for nitrate measurement, then measurement specificity is achieved, but the sensors have high costs and poor chemical stability in water environments
Solution Approach 1:
The patent replaces expensive biological identification materials with inexpensive graphene material that can be mass-produced through chemical vapor deposition, significantly reducing sensor manufacturing costs while maintaining measurement capability
Solution Approach 2:
The patent uses functionalized graphene film as a composite material that combines the excellent electrical properties of graphene with specific chemical functional groups that provide nitrate nitrogen recognition capability, eliminating the need for biological materials and improving chemical stability in water environments
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 graphene sensor provides rapid and accurate nitrate nitrogen detection with a low limit of detection (1.8 nM) and strong anti-interference capabilities, suitable for real-time monitoring in water quality assessment, significantly improving upon existing methods.
Implementation Method 1
TEA is used as an electron donor of graphene, and the charge exchange between TEA and graphene leads to strong Coulomb attraction
Implementation Method 2
the charge exchange between TEA and graphene leads to strong Coulomb attraction
Data Source
AI summary
The present disclosure provides a graphene sensor and a preparation method and use thereof, and relates to the technical field of sensors. The graphene sensor according to the present disclosure includes a substrate, and an electrode layer and a functionalized graphene film that are laminated on a single side of the substrate, where the functionalized graphene film is obtained by modifying a graphene film with triethylamine. According to the present disclosure, the triethylamine is used as a probe to modify the graphene film, so that nitrate nitrogen can be sensitively and accurately measured. The graphene sensor according to the present disclosure identifies an object to be measured based on chemical functional groups instead of a biological method, and has low costs and high chemical stability.