Rapid Liquid Recognition and Quality Inspection with Graphene Test Papers

Area of Science:

• Materials Science
• Analytical Chemistry
• Sensor Technology

Background:

• Electronic tongues are crucial for liquid sensing in environmental, healthcare, and food quality applications.
• Rapid and simple liquid sensing methods are needed for routine quality control.
• Nanomaterials offer potential for miniaturizing sensing devices.

Purpose of the Study:

• To develop a broad-spectrum liquid-sensing system for rapid liquid recognition.
• To utilize disposable graphene-polymer nanocomposite test paper for this purpose.
• To demonstrate the system's efficacy in identifying complex liquids and toxicants.

Main Methods:

• Fabrication of disposable graphene-polymer nanocomposite test paper via ion-assisted filtration.
• Development of a broad-spectrum electronic tongue system.
• Testing the system with various complex liquids, including metal salt solutions, polymer solutions, soft drinks, alcoholic liquor, and milk.

Main Results:

• Successful recognition of complex liquids, including metal salt and polymer solutions.
• Demonstrated suitability for foodstuff quality assessment (soft drinks, alcoholic liquor, milk).
• Effective detection of toxicants within these liquids.

Conclusions:

• The developed electronic tongue system, based on graphene-polymer nanocomposite test paper, offers rapid and simple liquid sensing.
• The system is highly effective for food quality control and toxicant detection.
• The material-structure design and detection method have potential for broader applications in chemical sensing.