Volatile Organic Compound Detection by Graphene Field-Effect Transistors Functionalized with Fly Olfactory Receptor...

Area of Science:

• Biomimetic sensors
• Nanomaterials for chemical detection
• Olfactory receptor research

Background:

• Graphene field-effect transistors (gFETs) show promise for volatile organic compound (VOC) sensing but suffer from low specificity.
• Developing highly specific sensors is crucial for accurate VOC detection in various applications.

Purpose of the Study:

• To design and implement a gFET sensor with enhanced specificity for limonene detection.
• To utilize peptides mimicking a fruit fly olfactory receptor (OR19a) for targeted VOC sensing.

Main Methods:

• High-throughput peptide array and gas chromatography were used to design OR19a mimetic peptides.
• Peptide probes were bifunctionalized with a graphene-binding peptide for facile sensor surface self-assembly.
• gFET devices were functionalized with the designed peptide probes for limonene detection.

Main Results:

• The peptide-modified gFET achieved highly sensitive and selective detection of limonene.
• The sensor demonstrated a detection range of 8-1000 pM for limonene.
• Facile, one-step self-assembly of the peptide probe onto the gFET surface was achieved.

Conclusions:

• A target-specific peptide selection and functionalization strategy advances precise VOC detection systems.
• Peptide-modified gFETs offer a promising platform for overcoming specificity challenges in chemical sensing.
• This approach enables sensitive and selective detection of specific VOCs like limonene.