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Detection of explosives based on surface-enhanced Raman spectroscopy
Hainer Wackerbarth1, Christian Salb, Lars Gundrum
1Laser-Laboratorium Göttingen e.V., Photonic Sensor Technology, Hans-Adolf-Krebs-Weg 1, D-37077 Göttingen, Germany. hainer.wackerbarth@llg-ev.de
Applied Optics
|August 11, 2010
Summary
This study introduces a surface-enhanced Raman scattering (SERS) device for detecting airborne explosives like TNT and TATP. Optimized substrate temperature enhances explosive detection sensitivity using SERS.
Area of Science:
- Analytical Chemistry
- Spectroscopy
- Materials Science
Background:
- Detection of airborne explosives is critical for security.
- Surface-Enhanced Raman Scattering (SERS) offers high sensitivity for molecular detection.
- Nanostructured substrates are key for enhancing SERS signals.
Purpose of the Study:
- To develop and evaluate a SERS-based device for airborne explosive detection.
- To analyze the SERS spectra of trinitrotoluene (TNT) and triacetone triperoxide (TATP).
- To investigate the effect of substrate temperature on TATP detection sensitivity.
Main Methods:
- Utilized a nanostructured gold substrate for SERS.
- Resublimated airborne explosives (TNT, TATP) onto the cooled substrate.
- Analyzed SERS spectra and compared with bulk Raman spectra.
- Investigated substrate temperature effects on TATP SERS signals.
Main Results:
- Successfully detected TNT and TATP using the SERS device.
- SERS spectrum of TATP showed minimal frequency shift compared to bulk.
- TATP signal intensity increased with decreasing temperature down to 200 K.
- TATP spectral fingerprint was lost below 200 K.
Conclusions:
- The developed SERS device is effective for airborne explosive detection.
- Substrate temperature significantly influences the sensitivity and detectability of TATP.
- Optimizing substrate temperature is crucial for maximizing SERS-based explosive detection.
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