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Please use this identifier to cite or link to this item: http://apo.ansto.gov.au/dspace/handle/10238/3884

Title: Solid State Dendrimer Sensors: Effect of Dendrimer Dimensionality on Detection and Sequestration of 2,4-Dinitrotoluene
Authors: Cavaye, H
Shaw, PE
Smith, ARG
Burn, PL
Gentle, IR
James, M
Lo, SC
Meredith, P
Keywords: Sensors
Luminescence
Neutron Reflectors
Measuring Methods
Films
Fluorescence
Issue Date: 22-Sep-2011
Publisher: American Chemical Society
Citation: Cavaye, H., Shaw, P.E., Smith, A.R.G., Burn, P.L., Gentle, I.R., James, M., Lo, S.C., Meredith, P. (2011), Solid State Dendrimer Sensors: Effect of Dendrimer Dimensionality on Detection and Sequestration of 2,4-Dinitrotoluene, Journal of Physical Chemistry C, 115(37), 18366-18371.
Abstract: We compare two dendrimers, which contain the same luminescent chromophores but differ in dimensionality, for the detection of an explosive analyte via PL quenching. Each dendrimer has first generation biphenyl dendrons with 2-ethylhexyloxy surface groups but differ in the core units. One dendrimer has a bifluorene core and hence has a “planar†structure, whereas the second has four bifluorene units tetrahedrally arranged around an adamantyl center and hence has a “three-dimensional†structure. Solution Stern–Volmer measurements have previously been reported to show that the three-dimensional dendrimer has a higher binding constant than that of the more planar compound. Films of the dendrimers rapidly detect 2,4-dinitrotoluene (DNT) with thinner films (∼25 nm) being more responsive than thicker films (∼85 nm). Neutron reflectometry measurements show that the analyte can diffuse completely through the films with the three-dimensional dendrimer absorbing more of the analyte. The rate of recovery of the PL was faster for the planar dendrimer than the three-dimensional material showing that large binding constants are not necessary for reversible detection of analytes.© 2011, American Chemical Society
URI: http://dx.doi.org/10.1021/jp2055136s
http://apo.ansto.gov.au/dspace/handle/10238/3884
ISSN: 1932-7447
Appears in Collections:Journal Articles

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