Aminophenol Molecular Capture Layer for Specific Molecular Sensing with Field-Effect Devices.

Area of Science:

• Chemical sensing
• Materials science
• Nanotechnology

Background:

• Development of highly specific and sensitive recognition layers is crucial for advanced sensing applications.
• Existing methods for nerve agent detection often lack the required specificity, affinity, and field-deployability.
• Interface management with short receptor molecules offers a promising approach for targeted molecular recognition.

Purpose of the Study:

• To demonstrate a specific detection method for G-type nerve agent simulants using a novel recognition layer.
• To design and realize an electronic chemosensor based on a meta-nanochannel field-effect transistor (MNC FET).
• To quantify the sensor's performance in terms of specificity, limit of detection, dynamic range, and sensitivity.

Main Methods:

• Functionalization of a meta-nanochannel field-effect transistor (MNC FET) sensing area with 4-amino-2-((dimethylamino)methyl)phenol (amino-2-DMAMP) receptors via amine-based chemistry.
• Utilizing nucleophilic substitution reaction between surface-bound amino-2-DMAMP receptors and diethyl chlorophosphate (DCP) simulant for detection.
• Characterization of receptor-simulant interaction specificity and affinity using 31P-nuclear magnetic resonance (NMR) and electrospray ionization mass spectrometry (ESI-MS/MS).

Main Results:

• Demonstrated excellent specificity and affinity of amino-2-DMAMP receptors toward DCP simulant.
• Achieved a limit of detection of 1 pg/mL for DCP.
• Reported a wide dynamic range of 8 orders of magnitude with excellent linearity and sensitivity.
• Successfully realized a label-free electronic chemosensor with high electronic grade.

Conclusions:

• The developed recognition layer exhibits high specificity and affinity, suitable for sensing applications.
• The meta-nanochannel field-effect transistor (MNC FET) based chemosensor provides a platform for specific, label-free, and quantitative detection.
• The sensor technology is low-cost, easy-to-operate, and suitable for field-deployable applications in chemical sensing.