Graphene Inkjet Sensor Electrodes via Sulfur Doping
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Solution Overview
Problem
Existing graphene-based sensors require high temperature operation and are costly, limiting their widespread adoption for sensitive and selective detection of various target species.
Innovation Solution
A low-cost, low-temperature inkjet printing method using a formulation of water, polyvinylpyrrolidone (PVP), and graphene material, with optional sulphur-doping and metal functionalization, to create sensitive and selective graphene sensor electrodes that do not require high temperature operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional graphene-based sensors are used, then sensitivity and selectivity for target species are achieved, but high temperature operation is required and cost is high
Solution Approach 1:
The patent changes the chemical composition parameters of the graphene material by introducing sulfur doping and specific functional groups. This modifies the electronic and chemical properties of graphene, enabling it to achieve high sensitivity and selectivity for target species detection without requiring high temperature operation. The parameter change in material composition directly resolves the contradiction between measurement precision and operating temperature.
Solution Approach 2:
The patent creates a composite material system combining graphene with sulfur dopants and specific functional groups. This composite structure enhances the sensing capabilities of graphene while reducing its operational temperature requirements. The composite material approach allows simultaneous achievement of high sensitivity/selectivity and low temperature operation by leveraging synergistic effects between different components.
2Measurement precision
If conventional graphene-based sensors are used, then sensing performance is achieved, but manufacturing cost is high
Solution Approach 1:
The patent modifies the material parameters by using sulfur doping and specific functionalization methods that can be implemented through relatively simple chemical treatments. These parameter changes enable high sensing performance to be achieved through chemical modification rather than complex fabrication processes, thereby reducing manufacturing costs while maintaining or improving sensing performance.
Solution Approach 2:
The patent employs wet chemical methods for graphene functionalization that can be performed in solution phase, allowing for easier processing and potential recovery of reagents. This approach replaces costly vacuum-based or high-temperature fabrication methods with more economical wet chemistry techniques, reducing overall manufacturing costs while achieving the desired sensing performance.
3Reliability
If high temperature operation is required, then sensor performance is maintained, but power consumption increases and lifespan decreases
Solution Approach 1:
The patent changes the material properties of graphene through sulfur doping and functionalization, which enables the sensor to maintain high reliability and performance at lower operating temperatures. This parameter change in material composition allows the sensor to function effectively without high temperature heating, thereby reducing power consumption and extending operational lifespan while maintaining sensor performance.
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 method enables the fabrication of graphene-based sensors with high sensitivity and selectivity for a variety of target species at low temperatures, reducing operational costs and extending the sensors' lifespan through low power consumption.
Implementation Method 1
PVP functions as a stabilising agent to prevent graphene flakes from agglomerating in an ink formulation
Implementation Method 2
PVP functions as a concentrating agent at the surface of a graphene based sensing electrode
Implementation Method 3
treating a graphene material with sulfamic acid and/or thiourea
Implementation Method 4
growing metal containing nanostructures on the surface of the treated graphene material
Data Source
AI summary
Graphene based sensor technology is described. Certain aspects relate to graphene containing ink formulations suitable for fabricating sensor electrodes via inkjet printing methods and to sensor electrodes produced from such ink formulations. Certain further aspects relate to processes for fabricating functionalized graphene materials for use in such ink formulations. Further still, certain aspects relate to sensors comprising graphene sensor electrodes.