Nanomaterials for luminescence detection of nitroaromatic explosives

Kırpık

et al. 2019

Applied Organom Chemis

In this work, four new Nd (III) and Sm (III) complexes of two pentadendate ligands (L1 and L2) were prepared and their molecular structures were determined by single crystal X‐ray diffraction studies. X‐ray analysis showed that the Nd (III) and Sm (III) complexes of L1 sits on a twofold crystallographic axis while the complexes of L2 does not show crystallographically imposed symmetry. Absorption and photoluminescence properties of the complexes were studied both in the solid state and DMF solutions. The fluorescence sensing of nitro‐aromatic compounds [nitrobenzene (NB), 4‐nitrophenol (NP), 2,4‐dinitrophenol (DNP) and 2,4,6‐trinitrophenol (TNP)] were studied by photoluminescence spectroscopy. All four complexes showed better sensitivity towards nitrophenol (NP) with low LOD values.

Section: Resultsmentioning

confidence: 99%

New Sm (III) and Nd (III) complexes: Synthesis, structural characterization and fluorescent sensing of nitro‐aromatic compounds

Kırpık

et al. 2019

Applied Organom Chemis

“…It can be seen from Figure 5 that distilled water (3) does not change its thermal conductivity throughout the duration of the test, as expected for a non-carbonated liquid. Ale (18) demonstrates the largest increase in thermal conductivity upon outgassing, followed by cola (16) and sparkling water (17). It is important to note that, while cola (16) and ale (18) have both stabilized in thermal conductivity by 25 minutes open and 50 minutes open, respectively, the sparkling water (17) has failed to stabilize in thermal conductivity by 60 minutes of testing.…”

Section: Carbonation Evaluationmentioning

confidence: 97%

“…14 Spectroscopic technologies employ mass spectrometry or infrared spectrometry to detect illicit or hazardous materials. [15][16][17][18][19][20][21] These techniques are able to detect trace amounts of explosive or illicit material in vapor or as residue collected from swabs taken of luggage or a person's skin. These technologies vary greatly in principle but tend to be spot analyses rather than bulk analysis and are unable to detect materials through a barrier -thus a hermetically sealed can poses an insurmountable barrier to the test.…”

Section: Introductionmentioning

confidence: 99%

Application of the modified transient plane source technique for early detection of liquid explosives

et al. 2016

The paper will review the feasibility of adapting the Modified Transient Plane Source (MTPS) method as a screening tool for early-detection of explosives and hazardous materials. Materials can be distinguished from others based on their inherent thermal properties (e.g. thermal effusivity) in testing through different types of barrier materials. A complimentary advantage to this technique relative to other traditional detection technologies is that it can penetrate reflective barrier materials, such as aluminum, easily. A strong proof-of-principle is presented on application of the MTPS transient thermal property measuring in the early-screening of liquid explosives. The work demonstrates a significant sensitivity to distinguishing a wide range of fluids based on their thermal properties through a barrier material. The work covers various complicating factors to the longer-term adoption of such a method including the impact of carbonization and viscosity. While some technical challenges remain, the technique offers significant advantages in complimenting existing detection methods in being able to penetrate reflective metal containers (e.g. aluminum soft drinkscans) with ease.

Sensors and Actuators B: Chemical

“…Over the years, numerous analytical methods have been developed for the detection of TNT in soil and water [10][11][12][13][14]. However, the in-field and real-time determination of TNT at the ultratrace level still face limitations in terms of sensitivity, selectivity, reproducibility, cost-effectiveness and suitability to field analysis.…”

Section: Introductionmentioning

confidence: 99%

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

Jamil

Sivanesan

Izake

et al. 2015

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