With the support of the National Natural Science Foundation of China, the research team led by Researcher Zhang Zhongping, Institute of Intelligence, Chinese Academy of Sciences (recipient of the National Outstanding Youth Fund, Chinese Academy of Sciences "100 Persons Program") focuses on the surface of various materials and those mixed with trace amounts of explosive substances Timely and on-site detection of this challenging problem, using the unique fingerprint information of Raman spectroscopy and the advantages of Raman substrates to easily modify Raman active molecules, developed a Raman sensor test paper that can smell the odor of explosives. Relevant research results were published in the internationally renowned chemical journal "Analytical Chemistry" recently, and they also applied for national invention patents.
Detecting suspicious packages, mail and explosives hidden by terrorists has always been a topic of great concern in the field of international anti-terrorism and public safety. Due to the low vapor pressure and high explosive nature of nitro explosives, the current airport security inspection mainly relies on ion mobility spectroscopy and X-ray diffraction equipment, making it difficult to achieve rapid, timely and low-cost detection. The researchers of this research group printed silver nanoparticles on the filter membrane by inkjet printing technology and modified Raman active molecules (p-mercaptoaniline) to prepare Raman sensing test paper sensitive to TNT. When TNT residual particles invisible to the naked eye are adhered to the surface of envelopes, clothes, parcels, soil, etc., the TNT crystal adhered to the surface can be vaporized by using a low-energy laser (without damaging the surface of the object), and then the Raman sensor test paper is placed Above the laser, collect the vapor volatilized by TNT, and then use Raman instrument to detect. According to the change of Raman signal of Raman active molecules, determine and identify whether the substance contains TNT. The detection limit in solution can reach 1.6 × 10-17 / cm2 TNT; similarly, the TNT atmosphere is assisted by low-energy laser A TNT of 1.4 ppm can be detected with a detection time of 2 seconds. The work was highly appraised by the reviewers and considered that "the idea of ​​this work is highly innovative and provides a new means for the rapid detection of explosives on site. It is an excellent and important research work."
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