Chemosensing of 1,4-dinitrobenzene using bisfluorene dendrimer distributed feedback lasers

Richardson, S.; Barcena, H. S.; Turnbull, G. A.; Burn, P. L.; Samuel, I. D. W.
August 2009
Applied Physics Letters;8/10/2009, Vol. 95 Issue 6, p063305
Academic Journal
We report the trace vapor detection of the molecule 1,4-dinitrobenzene, a model analyte for the explosive substance 2,4,6-trinitrotoluene, via fluoresence quenching of a first generation conjugated dendrimer containing a 2,2′-bis[9,9-di-n-hexylfluorene] core. We show that much greater sensitivity can be obtained by using the material as a surface emitting distributed feedback laser. We find that the slope efficiency of the laser is a convenient and sensitive indicator of the presence of the analyte. The slope efficiency decreases by a factor 50 in the presence of 1,4-dinitrobenzene.


Related Articles

  • Photofragmentation of nitro-based explosives with chemiluminescence detection. Monterola, Maria Pamela P.; Smith, Benjamin W.; Omenetto, Nicolò; Winefordner, James D. // Analytical & Bioanalytical Chemistry;Aug2008, Vol. 391 Issue 7, p2617 

    A simple, fast, reliable, sensitive and potentially portable explosive detection device was developed employing laser photofragmentation (PF) followed by heterogeneous chemiluminescence (CL) detection. The PF process involves the release of NOx(x = 1,2) moieties from explosive compounds such as...

  • High power laser photochemistry. Production of neutral atomic and small molecular fragments by UV multiphoton dissociation. Chen, Peter; Pallix, Joan B.; Chupka, William A.; Colson, Steven D. // Journal of Chemical Physics;1/1/1986, Vol. 84 Issue 1, p527 

    Atomic carbon, Ch, CH2, and CH3, produced by UV multiphoton dissociation, have been detected by resonant MPI on picosecond and nanosecond time scales. Large yields of neutral fragments produced within the pulse width of the dissociation laser suggest that exceedingly rapid radiationless...

  • Competitive amperometric immunosensor based on covalent linking of a protein conjugate to dendrimer-functionalised nanogold substrate for the determination of 2,4,6-trinitrotoluene. Giannetto, Marco; Maiolini, Elisabetta; Ferri, Elida; Girotti, Stefano; Mori, Giovanni; Careri, Maria // Analytical & Bioanalytical Chemistry;Jan2013, Vol. 405 Issue 2/3, p737 

    A new amperometric immunosensor for 2,4,6-trinitrotoluene based on the working principle of competitive enzyme-linked immunosorbent assay was developed and characterised. An electrodeposited nanogold substrate was functionalised by deposition of self-assembled monolayers of 2-aminoethanethiol as...

  • Reactions of iron clusters with hydrogen. III. Laser-induced desorption of H2 by multiphoton absorption. Liu, K.; Parks, E. K.; Richtsmeier, S. C.; Pobo, L. G.; Riley, S. J. // Journal of Chemical Physics;9/15/1985, Vol. 83 Issue 6, p2882 

    Multiphoton absorption and ionization of hydrogenated (or deuterated) iron clusters generally leads to desorption of a specific number of H2 (or D2) molecules for a given cluster size and a given number of photons absorbed. Ionization via single photon absorption occurs without desorption....

  • Continuous flow, explosives vapor generator and sensor chamber. Collins, Greg E.; Giordano, Braden C.; Sivaprakasam, Vasanthi; Ananth, Ramagopal; Hammond, Mark; Merritt, Charles D.; Tucker, John E.; Malito, Michael; Eversole, Jay D.; Rose-Pehrsson, Susan // Review of Scientific Instruments;2014, Vol. 85 Issue 5, p1 

    A novel liquid injection vapor generator (LIVG) is demonstrated that is amenable to low vapor pressure explosives, 2,4,6-trinitrotoluene and hexahydro-1,3,5-trinitro-1,3,5-triazine. The LIVG operates in a continuous manner, providing a constant and stable vapor output over a period of days and...

  • Dendrimer supermolecules.  // Science Teacher;Jan98, Vol. 65 Issue 1, p14 

    Reports that scientist have developed a class of large dendrimer super-molecules, which can be used for converting sunlight into electricity. Comments from researcher, Raoul Kopelman; Information on the molecules.

  • vapor pressure.  // American Heritage Student Science Dictionary;2009, p360 

    A definition of the term "vapor pressure" is presented. It is the pressure exerted by water vapor in the atmosphere. It is also the pressure exerted by a vapor on the solid or liquid phase with which it is in equilibrium. At pressures lower than the vapor pressure, atoms or molecules of the...

  • Gas-phase diagnostics by laser-induced gratings II. Experiments. Stampanoni-Panariello, A.; Kozlov, D.; Radi, P.; Hemmerling, B. // Applied Physics B: Lasers & Optics;Jul2005 Part 1, Vol. 81 Issue 1, p113 

    In this article we review the results achieved in the past ten years at the Paul Scherrer Institute on the topic of diagnostics in the gas phase by laser-induced gratings (LIGs). The technique has been applied for thermometry in air and in flames at different pressures, for flow velocimetry, for...

  • Microbial degradation of explosives: biotransformation versus mineralization. Hawari, J.; Beaudet, S.; Halasz, A.; Thiboutot, S.; Ampleman, G. // Applied Microbiology & Biotechnology;Nov2000, Vol. 54 Issue 5, p605 

    The nitroaromatic explosive 2,4,6-trinitrotoluene (TNT) is a reactive molecule that biotransforms readily under both aerobic and anaerobic conditions to give aminodinitrotoluenes. The resulting amines biotransform to give several other products, including azo, azoxy, acetyl and phenolic...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics