SWCNT Network-FET Device for Human Serum Albumin Detection

Area of Science:

• Materials Science and Engineering
• Nanotechnology
• Biomedical Engineering
• Biosensor Technology

Background:

• Human serum albumin (HSA) is vital for physiological functions.
• Accurate detection of HSA is crucial for various diagnostic applications.
• Existing biosensor technologies require improvement in sensitivity and specificity.

Purpose of the Study:

• To develop a simple, fast, and reliable method for fabricating random single-walled carbon nanotube (SWCNT) thin films.
• To utilize these SWCNT films as transducers in a field-effect transistor (FET) based biosensor for human serum albumin (HSA) detection.
• To demonstrate the biosensor's capability for quantifying HSA in complex biological matrices.

Main Methods:

• Fabrication of SWCNT network thin films using the airbrush deposition technique.
• Morphological characterization via atomic force microscopy (AFM) and field-emission scanning electron microscopy (FESEM).
• Electrical analysis using three-terminal current-voltage (IV) measurements and Fourier transform infrared (FTIR) spectroscopy for surface alteration verification.

Main Results:

• The SWCNT network thin film was successfully fabricated and characterized.
• The biosensor demonstrated a highly sensitive detection of HSA with a limit of detection (LOD) of 0.47 fg/mL.
• The sensor exhibited excellent specificity, distinguishing HSA from interfering biomolecules like bovine serum albumin (BSA).

Conclusions:

• The developed SWCNT-FET biosensor offers a promising platform for sensitive and specific HSA quantification.
• The airbrush deposition method provides a simple and efficient approach for fabricating SWCNT-based transducers.
• This technology holds potential for application in clinical diagnostics and biological monitoring.