A highly sensitive and selective detection of 2,4,6-trinitrotoluene (TNT) using a peptide-functionalized silicon...

Area of Science:

• Nanotechnology
• Chemical Sensing
• Biomolecular Engineering

Background:

• 2,4,6-trinitrotoluene (TNT) is a common explosive requiring sensitive detection methods.
• Existing detection technologies for TNT often lack the required sensitivity and specificity.
• Development of portable and highly sensitive explosive detection systems is crucial for security applications.

Purpose of the Study:

• To develop a highly sensitive and specific sensor for the detection of 2,4,6-trinitrotoluene (TNT).
• To investigate the influence of biointerfacing linker chemistry and ionic strength on sensor performance.
• To achieve femtomolar level detection limits for TNT.

Main Methods:

• Self-assembly of silicon nanowire (SiNW) arrays.
• Functionalization of SiNWs with anti-TNT peptides for specific TNT binding.
• Investigation of buffer ionic strength (phosphate buffer solution - PBS) effects on binding signals.
• Optimization of sensor parameters for enhanced TNT detection.

Main Results:

• Demonstrated highly sensitive and specific detection of TNT using a functionalized SiNW array sensor.
• Achieved a record low detection limit of 0.2 femtomolar (fM) for TNT.
• Identified optimal conditions for biointerfacing and ionic strength for maximal sensor response.

Conclusions:

• The optimized peptide-functionalized SiNW array sensor exhibits unprecedented sensitivity for TNT detection.
• The developed sensor technology shows significant potential for creating portable devices for femtomolar level TNT detection.
• This research advances the field of explosive detection through innovative nanotechnology and biomolecular approaches.