Surface enhanced Raman scattering (SERS) spectra of trinitrotoluene in silver colloids prepared by microwave heating method

详细信息    查看全文

• 作者：Chunling Zhang ; Kaijun Wang ; Dejun Han ; Qing Pang
• 关键词：Surface enhanced Raman scattering (SERS) ; Silver colloid ; Trinitrotoluene (TNT) ; Microwave heating
• 刊名：Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy
• 出版年：25 March, 2014
• 年：2014
• 卷：122
• 期：Complete
• 页码：387-391
• 全文大小：548 K

文摘

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 10^鈭?0 mol L^鈭? and some preliminary experiments of detecting TNT vapor (about 10 渭g/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.