Increasing the detection speed of an all-electronic real-time biosensor

Area of Science:

• Nanotechnology
• Biomedical Engineering
• Physical Chemistry

Background:

• Biosensor response time is critical for applications and depends on biomolecule transport.
• Carbon nanotube field-effect transistors (CNFETs) are promising nanoelectronic biosensors.
• Optimizing biomolecule delivery to the sensor surface is essential for improving performance.

Purpose of the Study:

• To investigate a strategy for enhancing protein flux to CNFET biosensors.
• To quantify the impact of blocking upstream binding sites on protein binding rates.
• To demonstrate a new method for characterizing nanoelectronic biosensor performance.

Main Methods:

• Fabrication of carbon nanotube field-effect transistor biosensors.
• Quantification of protein binding rates on nanoelectronic sensors.
• Application of a protein-repellent coating to block upstream binding sites.
• Mass transport modeling to determine maximal flux enhancement.

Main Results:

• A 2.5-fold increase in initial protein flux to the biosensor was observed when upstream binding sites were blocked.
• Mass transport modeling provided insights into the theoretical limits of flux enhancement.
• The study established a novel methodology for assessing nanoelectronic biosensor performance.

Conclusions:

• Blocking upstream binding sites is an effective strategy to enhance protein flux in biosensors.
• This mass transport optimization approach is applicable to various microfluidic-based biosensors.
• The findings contribute to the development of faster and more efficient biosensing technologies.