Molecular recognition of 2,4,6-trinitrotoluene by 6-aminohexanethiol and surface-enhanced Raman scattering sensor

Abstract

TNT) sensor 6-Aminohexanethiol (AHT) and mixed monolayer Surface-enhanced Raman spectroscopy (SERS) Electrochemical desorption and X-ray photoelectron spectroscopy (XPS) Analysis of explosives in soil a b s t r a c t 2,4,6-Trinitrotoluene (TNT) is one of the most commonly used nitro aromatic explosives in landmine, military and mining industry. This article demonstrates rapid and selective identification of TNT by surface-enhanced Raman spectroscopy (SERS) using 6-aminohexanethiol (AHT) as a new recognition molecule. First, Meisenheimer complex formation between AHT and TNT is confirmed by the development of pink color and appearance of new band around 500 nm in UV-vis spectrum. Solution Raman spectroscopy study also supported the AHT:TNT complex formation by demonstrating changes in the vibrational stretching of AHT molecule between 2800 and 3000 cm −1 . For surface enhanced Raman spectroscopy analysis, a self-assembled monolayer (SAM) of AHT is formed over the gold nanostructure (AuNS) SERS substrate in order to selectively capture TNT onto the surface. Electrochemical desorption and Xray photoelectron studies are performed over AHT SAM modified surface to examine the presence of free amine groups with appropriate orientation for complex formation. Further, AHT and butanethiol (BT) mixed monolayer system is explored to improve the AHT:TNT complex formation efficiency. Using a 9:1 AHT:BT mixed monolayer, a very low detection limit (LOD) of 100 fM TNT was realized. The new method delivers high selectivity towards TNT over 2,4 DNT and picric acid. Finally, real sample analysis is demonstrated by the extraction and SERS detection of 302 pM of TNT from spiked. Crown

Rapid DNT fluorescent films detection with high sensitivity and selectivity

“…Detection of trace explosives such as 2, 4, 6-trinitrotoluene (TNT) and 2, 4dinitrotoluene (DNT) is of great significance due to their serious threat to homeland security and public safety [1][2][3]. So far, the common techniques detected trace explosives mainly include gas chromatography mass spectrometry (GC-MS) [4,5], X-ray imaging [6], ion mobility spectroscopy (IMS) [7], surface-enhanced Raman spectroscopy [8,9], and electrochemical methods [10,11]. But these technologies usually exhibit some disadvantages such as high cost, complicated operation and time-consuming.…”

Positively-charged plasmonic nanostructures for SERS sensing applications

“…In addition to inorganic anions, a large set of small negativelycharged organic molecules such as explosives, 22,48,68,70,71,[81][82][83] pollutants, 28,66,73,84,85 and pigments 25,31,44 has been targeted by SERS-sensing approaches using positively-charged plasmonic nanomaterials.…”

A Rapid and Sensitive Quantitative Analysis Method for TNT using Raman Spectroscopy

“…2,4,6-Trinitrotoluene (TNT) is a classic explosive that has been extensively used [17][18][19]. It is usually synthesized by the nitration of toluene, in which the byproducts such as [a] F. Gao 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 2,4-dinitrotoluence (DNT) and 2,6-DNT would be produced.…”