材料科学
爆炸物
三硝基甲苯
季戊四醇四硝酸酯
电子束物理气相沉积
蒸发
纳米孔
蒸汽压
拉曼散射
纳米技术
基质(水族馆)
拉曼光谱
化学气相沉积
光电子学
化学
光学
物理
有机化学
热力学
海洋学
地质学
作者
Samir Adhikari,Daegwon Noh,Minjun Kim,Dae-Hyun Ahn,Yudong Jang,Eunsoon Oh,Dong Hoon Lee
标识
DOI:10.1016/j.saa.2024.123996
摘要
Non-invasive and passive detection of explosives in the vapor phase is advantageous for military, counter-terrorism, and homeland security applications. Detection of explosives using SERS has been an active research topic. However, the vapor pressures of most explosives are low at room temperature, and consequently, the vapor phase detection by SERS is highly challenging without intentionally heating explosive powder to increase the vapor pressure. In this work, we report the rapid and sensitive detection of 2,4,6-trinitrotoluene (TNT) and 2,4-dinitrotoluene (2,4-DNT) in the vapor phase, using a gold nanogap (AuNG) SERS substrate. The AuNG SERS substrate was fabricated with electron beam evaporation, rapid thermal annealing, and wet etching. SERS measurements were carried out with an incident power as low as 0.56 mW at 785 nm. To prevent the condensation effect, the TNT and 2,4-DNT powders inside the cuvette were taken out before inserting the nanogap substrate. Our SERS results demonstrate the feasibility of the non-invasive detection of vapor phase explosives under ambient conditions.
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