A chemodosimeter-modified carbon nanotube-field effect transistor: toward a highly selective and sensitive electrical...

Area of Science:

• Nanoelectronics
• Biosensing
• Chemical Sensors

Background:

• Carbon nanotube-field effect transistors (CNT-FETs) offer high sensitivity for electronic detection.
• Chemodosimeters provide specific molecular recognition through chemical transformation.
• Integrating these technologies can enhance biosensing capabilities.

Purpose of the Study:

• To develop a CNT-FET biosensor utilizing the chemodosimeter principle for cysteine detection.
• To demonstrate the signaling mechanism based on chemodosimeter chemical transformation.
• To evaluate the sensor's performance in terms of sensitivity, selectivity, and speed.

Main Methods:

• Immobilizing a cysteine-selective chemodosimeter onto the CNT surface.
• Utilizing CNT-FETs to monitor real-time conductance changes.
• Investigating the molecular interaction between the chemodosimeter and cysteine.

Main Results:

• The chemodosimeter undergoes specific chemical transformation upon interaction with cysteine.
• This transformation alters charge distribution, affecting CNT-FET conductivity.
• Achieved label-free, rapid, highly selective detection of cysteine with a 0.45 fM limit of detection.

Conclusions:

• The study validates the chemical transformation of chemodosimeters as a signaling principle for CNT electronic sensors.
• The developed CNT-FET biosensor demonstrates excellent performance for ultrasensitive and selective cysteine detection.
• This technology holds promise for advanced sensing platforms in practical applications.