Ultra trace detection of explosives in air: Development of a portable fluorescent detector

Caron, Thomas; Guillemot, Marianne; Montméat, Pierre; Veignal, Florian; Perraut, François; Prené, P.; Serein-Spirau, Françoise

doi:10.1016/j.talanta.2009.12.040

Cited by 71 publications

(47 citation statements)

References 15 publications

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“…For example, Caron et al 91 reported of a highly π-conjugated phenylene-ethynylene diimine (Figure 1.20, left), which is highly emissive in the solid state, but its emission is quenched by adsorption of nitroaromatic molecules on its specific adsorption sites. In the presence of nitro aromatic compounds, the emission of the fluorophore is quenched due to a charge transfer mechanism, as previously seen in the case of conjugated polymers.…”

Section: 81mentioning

confidence: 99%

Vapochromic features of new luminogens based on julolidine-containing styrene copolymers

et al. 2017

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We report on vapochromic films suitable for detecting volatile organic compounds (VOCs), based on new polystyrene copolymers containing julolidine fluorescent molecular rotors (JCAEM). Poly(styrene-co-hydroxyethylmethacrylate) copolymers functionalized with cyanovinyl-julolidine moieties of different compositions were prepared, (P(STY-co-JCAEM)(m) with m = 0.06–0.61). The sensing performance of the spin-coated copolymer films demonstrated significant vapochromism when exposed to VOCs characterized by high vapour pressure and a favourable interaction with the polymer matrix, such as Et2O and CH2Cl2. It is worth mentioning that the fluorescence decrease rate was 7 times faster than that of previously investigated julolidine-based fluorescent molecular rotors dispersed in PS films. This phenomenon was attributed to the better control of the JCAEM moiety distribution in the polymer matrix conferred by the covalent approach, combined with a minimal film thickness of 4 microns. These factors, in concert, strongly accelerate the deactivation pathways of the JCAEM units in the presence of VOCs which interact well. Overall, the present results support the use of julolidine-enriched styrene copolymers as effective chromogenic materials suitable for the fast detection of VOCs.

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Section: 81mentioning

confidence: 99%

Vapochromic features of new luminogens based on julolidine-containing styrene copolymers

et al. 2017

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“…The film was deposited on a glass substrate, then acted as a wave-guide, and was used for the ultra-trace detection of TNT or 2,4-DNT in ambient air or on objects tainted with these explosives. 109 This material exhibited excellent fluorescence properties and the high electron density of the diimine As cited above, the chromogenic behaviour of receptor 131 in the presence of TNB was similar to that observed in the presence of TNT and PA in the chloroform solutions of this compound (colour modulations from yellow to green). In contrast, receptor 131 was characterised by modest binding affinities to TNB, TNT and PA in organic solvents, and was also found to require relatively high concentrations to produce a detectable colorimetric response to the naked eye.…”

Section: 110supporting

confidence: 60%

“…Stern-Volmer plots indicated a dynamic quenching process in which nitro derivatives accepted an electron from the excited state of 103. In an additional work, the same authors prepared a family of Zn (salicylaldimine) derivatives (104)(105)(106)(107)(108)(109)(110). They were organised in a sensory array which was able to display differential responses to closely related nitroaromatics.…”

Section: 101 102mentioning

confidence: 99%

Functional hybrid materials for the optical recognition of nitroaromatic explosives involving supramolecular interactions

Soler¹

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Dedicada a todos los que me quieren y me han apoyado de corazón durante este largo camino, especialmente a mi familia y a ti Segundo. Luis Villaescusa, por esos conciertazos con sólo de trompeta en el 2.6, y por su experiencia en resolver dudas peliagudas. ¡MUCHAS GRACIAS! Por supuesto, ¡gracias chicas! Andrea, porque enseguida me integraste en el grupo, y nos hicimos inseparables. Un apoyo tanto fuera como dentro del lab, la hermana mayor que nunca tuve. Esteleta, la perla del lab, eres una máquina, y sobre todo estupenda, cuanto me has enseñado...no cambies nunca! Tati, que loca estás! la hippy un poco punk...jo, cuando te fuiste dejaste un vacio enorme, pero ves, todo llega en la vida, dentro de nada, doctora. Cris Sanfeliu, porque con tu alegría gatuna y buen corazón, siempre me has hecho sonreír, mi pequeña diseñadora. Inma Candel, como olvidar esas "candeladas", jajajaja, que buena eres, nadie me hace reír tanto, ¡hasta con chistes malos! María, con tu orden y calma nos encandilaste, un alma pura y llena de dulzura que nos enamoró. Sé que vas a llegar muy alto, porque tú vales mucho mi niña, créeme! Sois mis pequeñonas para siempre, por muy grandes que nos hagamos. Inma Campos, porque tu "me aburro" y los "patos" siempre me recordarán a ti, por no decir ese viaje a Copenhague y muchas otras aventuras inolvidables. Merche, sabes que sin ti no sabría hacer un filtro de pliegues, y siempre te lo recuerdo. A mis mamis: Elena, floreta, porque tu saber estar es de admirar y tus grandes consejos siempre me ayudan a mejorar en todo en la vida, no sólo en la química; a Carmen, por tu gran paciencia y experiencia en el lab; y por supuesto a Rosa, por su risa contagiosa y su bondad. ¡Gracias amores! A los chicos: a Édgar, el peque de la casa pero con un gran corazón, siempre ofreciendo su mano y ayudando en todo, nadie me saca una sonrisa como tú; a Santi, porque eres un crack en orgánica; a Hanoi, por su ritmo cubano y sabrosura; a Pavel y Carlos, ResumenLa presente tesis doctoral titulada "Materiales funcionales híbridos para el reconocimiento óptico de explosivos nitroaromáticos mediante interacciones supramoleculares" se basa en la combinación de principios de Química Supramolecular y de Ciencia de los Materiales para el diseño y desarrollo de nuevos materiales híbridos orgánico-inorgánicos funcionales capaces de detectar explosivos nitroaromáticos en disolución.En primer lugar se realizó una búsqueda bibliográfica exhaustiva de todos los sensores ópticos (cromogénicos y fluorogénicos) descritos en la bibliografía y que abarca el período desde 1947 hasta 2011. Los resultados de la búsqueda están reflejados en el capítulo 2 de esta tesis.El primer material híbrido preparado está basado en la aplicación de la aproximación de los canales iónicos y, para ello, emplea nanopartículas de sílice funcionalizadas con unidades reactivas y unidades coordinantes (ver capítulo 3).Este soporte inorgánico se funcionaliza con tioles (unidad reactiva) y una poliamina lineal (unidad coordinante) y se estudia el transporte de una e...

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“…will generate a measurable response. The sensitivity of these dendrimer films is competitive when compared to previously reported fluorescent conjugated polymer films, [24][25][26] and porous silicon-based sensors, [27] although in the latter case a catalytic oxidation step was required in the detection process.…”

Section: Resultsmentioning

confidence: 79%

Assessing the sensing limits of fluorescent dendrimer thin films for the detection of explosive vapors

Shoaee

Chen

Cavaye

et al. 2017

Sensors and Actuators B: Chemical

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Photoluminescence quenching of organic thin films is a promising technique for the detection of vapors from explosives. The photoluminescence quenching response depends on the energetics of electron transfer from the photo-excited sensing material to the analytes, the vapor pressure of the analyte, and the diffusion process of the analytes in the sensing films. It is critical that the performance of a potential sensing material be evaluated in the solid-state with a range of analytes and across a range of vapor concentrations to ensure high sensitivities through noncontact sampling is achievable. We have investigated the photoluminescence quenching of three generations of carbazole-based dendrimers across a range of nitro-containing analyte vapor concentrations, including the TNT by-product 2,4-dinitrotoluene (DNT), and the tagging agent 2,3-dimethyl-2,3-dinitrobutane (DMNB). We show that the performance of all three dendrimer generations in the solid-state is near identical. Furthermore, we show that these dendrimers have a high affinity towards nitroaromatic compounds with parts per billion sensitivity, which makes them ideal for trace-level detection.

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Ultra trace detection of explosives in air: Development of a portable fluorescent detector

Cited by 71 publications

References 15 publications

Vapochromic features of new luminogens based on julolidine-containing styrene copolymers

Vapochromic features of new luminogens based on julolidine-containing styrene copolymers

Functional hybrid materials for the optical recognition of nitroaromatic explosives involving supramolecular interactions

Assessing the sensing limits of fluorescent dendrimer thin films for the detection of explosive vapors

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