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Proceedings Paper

Enhanced Raman spectroscopy of 2,4,6-TNT in anatase and rutile titania nanocrystals
Author(s): Edwin De La Cruz-Montoya; Jaqueline I. Jeréz; Marcia Balaguera-Gelves; Tatiana Luna-Pineda; Miguel E. Castro; Samuel P. Hernández-Rivera
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Paper Abstract

The majority of explosives found in antipersonnel and antitank landmines contain 2,4,6-trinitrotoluene (TNT). Chemical sensing of landmines and Improvised Explosive Devices (IED) requires detecting the chemical signatures of the explosive components in these devices. Nanotechnology is ideally suited to needs in microsensors development by providing new materials and methods that can be employed for trace explosive detection. This work is focused on modification of nano-scaled colloids of titanium dioxide (Titania: anatase, rutile and brookite) and thin layer of the oxides as substrates for use in Enhanced Raman Scattering (ERS) spectroscopy. Ultrafine particles have been generated by hydrothermally treating the sol-gel derived hydrous oxides. ERS spectra of nanocrystalline anatase Titania samples prepared with different average sizes: 38 nm (without acid), 24 nm (without acid) and 7 nm (with HCl). Bulk phase (commercial) and KBr were also used to prepare mixtures with TNT to look for Enhanced Raman Effect of the nitroaromatic explosive on the test surfaces. The studies clearly indicated that the anatase crystal size affects the enhancement of the TNT Raman signal. This enhancement was highest for the samples with Titania average crystal size of 7 nm.

Paper Details

Date Published: 9 May 2006
PDF: 7 pages
Proc. SPIE 6203, Optics and Photonics in Global Homeland Security II, 62030X (9 May 2006); doi: 10.1117/12.666129
Show Author Affiliations
Edwin De La Cruz-Montoya, Univ. of Puerto Rico-Mayagüez (United States)
Jaqueline I. Jeréz, Univ. of Puerto Rico-Mayagüez (United States)
Marcia Balaguera-Gelves, Univ. of Puerto Rico-Mayagüez (United States)
Tatiana Luna-Pineda, Univ. of Puerto Rico-Mayagüez (United States)
Miguel E. Castro, Univ. of Puerto Rico-Mayagüez (United States)
Samuel P. Hernández-Rivera, Univ. of Puerto Rico-Mayagüez (United States)

Published in SPIE Proceedings Vol. 6203:
Optics and Photonics in Global Homeland Security II
Theodore T. Saito; Daniel Lehrfeld, Editor(s)

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