Graphene field-effect transistor sensor for ultra-sensitive acrylamide detection

Overview

This solution is a chemical sensor built on a graphene field-effect transistor (FET) combined with a molecularly imprinted polymer (MIP) membrane for the ultra-sensitive detection of acrylamide. Acrylamide is a known carcinogen commonly found in heated starchy foods, coffee, and certain industrial processes, making reliable detection important for food safety, public health, and industrial quality control.

The core value proposition is a sensor that delivers high sensitivity, selectivity, and accuracy while remaining low-cost and suitable for mass production. By pairing graphene's unique electrical properties with a polymer membrane engineered to selectively bind acrylamide, the sensor can identify trace amounts of acrylamide in complex sample matrices. Potential applications include food safety testing, water quality monitoring, industrial process control, and environmental surveillance.

Technical specifications

How it works:

• Graphene serves as the sensing material; its electrical conductivity changes in response to charged molecules in its environment
• A molecularly imprinted polymer membrane acts as a selective filter, allowing only acrylamide molecules to pass through and interact with the graphene surface
• The change in graphene's electrical properties is measured and correlated to acrylamide concentration

Key features and demonstrated capabilities:

• The research team has previously demonstrated graphene transistor sensors for cancer biomarkers, nitrogen, and phosphate detection
• A phosphate-selective membrane on a graphene transistor achieved a detection limit of 0.1 ppm with a 10-second response time
• Optimization of graphene surface area and membrane thickness reduced phosphate detection limits to less than 1 ppt
• A suspended single-crystalline graphene sensor achieved multiplex lung cancer biomarker detection with a limit of detection of 0.1 ppt and a linear range from 1 ppt to 1 ppm
• Per-device cost is less than $1, with simple and fast operation
• Mass microfabrication compatibility supports low-cost, scalable manufacturing

Target performance for acrylamide detection:

• Projected detection limit of less than 0.1 ppb using standard graphene transistors
• Potential for even lower detection limits using suspended graphene configurations

Technology readiness level

The underlying graphene FET sensor platform has been validated through prior work on phosphate and cancer biomarker detection, demonstrating detection limits as low as 0.1 ppt and rapid response times. The acrylamide-specific sensor is at an earlier development stage. Future validation involves synthesizing acrylamide-selective molecularly imprinted polymers with optimized formulations, coating them onto graphene transistors, and evaluating sensitivity and detection limits. Estimated development time is approximately one year. The team is seeking partnership support for field testing and funding for key personnel.