Fabrication of SERS Swab for Direct Detection of Trace Explosives in Fingerprints

被引:135
作者
Gong, Zhengjun [1 ]
Du, Hongjie [1 ,2 ]
Cheng, Fansheng [2 ]
Wang, Cong [2 ]
Wang, Canchen [1 ,2 ]
Fan, Meikun [1 ]
机构
[1] Southwest Jiaotong Univ, Fac Geosci & Environm Engn, Chengdu 610031, Peoples R China
[2] Chengdu Green Energy & Green Mfg R&D Ctr, Chengdu 610207, Sichuan, Peoples R China
基金
中国国家自然科学基金;
关键词
ENHANCED RAMAN-SCATTERING; SURFACE; SPECTROSCOPY; NANOPARTICLES; IONIZATION; COLLECTION; SUBSTRATE; FIBER; VAPOR;
D O I
10.1021/am507424v
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Swab sampling is of great importance in surface contamination analysis. A cotton swab (cotton Q-tip) was successfully transformed into surface-enhanced Raman scattering (SERS) substrate (SERS Q-tip) through a bottom-up strategy, where Ag NPs were first self-assembled onto the Q-tip followed by in situ growing. The capability for direct swab detection of Raman probe Nile Blue A (NBA) and a primary explosive marker 2,4-dinitrotoluene (2,4-DNT) using the SERS Q-tip was explored. It was found that at optimum conditions, a femotogram of NBA on glass surface could be swab-detected. The lowest detectable amount for 2,4-DNT is only similar to 1.2 ng/cm(2) (total amount of 5 ng) on glass surface, 2 orders of magnitude more sensitive than similar surface analysis achieved with infrared technique, and comparable even with that obtained by ion mobility spectrometry-mass spectrometry. Finally, 2,4-DNT left on fingerprints was also analyzed. It was found that SERS signal of 2,4-DNT from 27th fingerprint after touching 2,4-DNT powder can still be clearly identified by swabbing with the SERS Q-tip. We believe this is the first direct SERS swabbing test of explosives on fingerprint on glass. Considering its relative long shelf life (>30 d), the SERS Q-tip may find great potential in future homeland security applications when combined with portable Raman spectrometers.
引用
收藏
页码:21931 / 21937
页数:7
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