Contrasting responses of organic transistors to nerve gas and explosive simulant vapors
We describe chemically sensitive organic transistors in which the semiconductor film consists of a base layer of a high mobility p- or n-channel molecular solid, and an overlayer contains analogous co...
Luminescent conjugated oligothiophenes: real time in vivo imaging of biomolecules
Molecular probes for selective identification of biomolecular targets are important to advance our understanding of the molecular mechanisms underlying pathological events and for clinical diagnostic ...
Sensing nitroaromatic analytes with a bifluorene-cored dendrimer
Proc. SPIE, Vol. 7418, 741803 (2009);
doi:10.1117/12.825821
Online Publication Date: 20 August 2009
Conference Date: Tuesday 4 August 2009
Conference Location: San Diego, CA, USA
Conference Title: Organic Semiconductors in Sensors and Bioelectronics II
Conference Chairs: Ruth Shinar, George G. Malliaras
Afirst generation dendrimer comprised of a 9,9,9',9'-tetra-n-hexyl substituted 2,2'-bifluorene core,biphenyl dendrons, and 2-ethylhexyloxy surface groups can rapidly detect highelectron affinity, explosive-related analytes such as pnitrotoluene and 2,4-dinitrotoluene. Stern-Volmeranalysis of the dendrimer in solution showed that the quenchingcould be either collisional or static but not a combinationof the two mechanisms. The Stern-Volmer analysis was found tobe critically dependent on correcting for the absorption of theanalyte at the excitation wavelength and the inner filter effect.Films of the dendrimer were found to have a measurabledecrease in the PL for all the nitroaromatic analytes inseconds. The luminescence of the films could be recovered onremoval of the analyte. It was found that both thin(25 nm) and thick (80 nm) films showed a rapidresponse to the analytes but for the less volatile analytesthe final level of quenching was less for the thickerfilms.
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