Surface enhanced Raman spectroscopy (SERS) has been demonstrated for the detection of trace levels of
explosives due to its high sensitivity, speed of detection and fingerprint feature. 2,4,6-Trinitrotoluene
(TNT), a leading example of nitroaromatic explosives, is causing wide concern. In this study, SERS spectra
of TNT solution in silver colloids have been successfully measured and a comparison was drawn with the
normal Raman spectra of bulk TNT. The silver colloids were prepared by the microwave heating method
and characterized by UV–Vis spectra and the scanning electron microscopy (SEM). NaCl and pH value
have a great impact on SERS intensity of TNT, the corresponding experimental research results and theoretical
interpretations were further illustrated to a certain extent. Moreover, the detection limit of TNT
in aqueous solution was achieved as low as 1010 mol L1 and some preliminary experiments of detecting
TNT vapor (about 10 lg/L) using SERS have been carried out. Our results demonstrated the potential of
SERS for probing TNT with high sensitivity, and suggest SERS as a powerful method for detection of
TNT and similar species at trace levels.
Surface enhanced Raman spectroscopy (SERS) has been demonstrated for the detection of trace levels ofexplosives due to its high sensitivity, speed of detection and fingerprint feature. 2,4,6-Trinitrotoluene(TNT), a leading example of nitroaromatic explosives, is causing wide concern. In this study, SERS spectraof TNT solution in silver colloids have been successfully measured and a comparison was drawn with thenormal Raman spectra of bulk TNT. The silver colloids were prepared by the microwave heating methodand characterized by UV–Vis spectra and the scanning electron microscopy (SEM). NaCl and pH valuehave a great impact on SERS intensity of TNT, the corresponding experimental research results and theoreticalinterpretations were further illustrated to a certain extent. Moreover, the detection limit of TNTin aqueous solution was achieved as low as 1010 mol L1 and some preliminary experiments of detectingTNT vapor (about 10 lg/L) using SERS have been carried out. Our results demonstrated the potential ofSERS for probing TNT with high sensitivity, and suggest SERS as a powerful method for detection ofTNT and similar species at trace levels.
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