Solid-state dendrimer sensors: Probing the diffusion of an explosive analogue using neutron reflectometry

Cavaye, Hamish, Smith, Arthur R. G., James, Michael, Nelson, Andrew, Burn, Paul L., Gentle, Ian R., Lo, S.-C. and Meredith, Paul (2009) Solid-state dendrimer sensors: Probing the diffusion of an explosive analogue using neutron reflectometry. Langmuir, 25 21: 12800-12805. doi:10.1021/la9017689


Author Cavaye, Hamish
Smith, Arthur R. G.
James, Michael
Nelson, Andrew
Burn, Paul L.
Gentle, Ian R.
Lo, S.-C.
Meredith, Paul
Title Solid-state dendrimer sensors: Probing the diffusion of an explosive analogue using neutron reflectometry
Journal name Langmuir   Check publisher's open access policy
ISSN 0743-7463
Publication date 2009-07-17
Sub-type Article (original research)
DOI 10.1021/la9017689
Volume 25
Issue 21
Start page 12800
End page 12805
Total pages 6
Editor David G Whitten
Josef F Holzwarth
Ralph G Nuzzo
Richard Crooks
Place of publication U. S. A.
Publisher American Chemical Society
Language eng
Subject C1
970102 Expanding Knowledge in the Physical Sciences
970103 Expanding Knowledge in the Chemical Sciences
030107 Sensor Technology (Chemical aspects)
030304 Physical Chemistry of Materials
030305 Polymerisation Mechanisms
091208 Organic Semiconductors
Abstract Determining how analytes are sequestered into thin films is important for solid-state sensors that detect the presence of the analyte by oxidative luminescence quenching. We show that thin (230 ± 30 Å) and thick (750 ± 50 Å) films of a first-generation dendrimer comprised of 2-ethylhexyloxy surface groups, biphenyl-based dendrons, and a 9,9,9′,9′-tetra-n-propyl-2,2′-bifluorene core, can rapidly and reversibly detect p-nitrotoluene by oxidative luminescence quenching. For both the thin and thick films the photoluminescence (PL) is quenched by p-nitrotoluene by 90% in 4 s, which is much faster than that reported for luminescent polymer films. Combined PL and neutron reflectometry measurements on pristine and analyte-saturated films gave important insight into the analyte adsorption process. It was found that during the adsorption process the films swelled, being on average 4% thicker for both the thin and thick dendrimer films. At the same time the PL was completely quenched. On removal of the analyte the films returned to their original thickness and scattering length density, and the PL was restored, showing that the sensing process was fully reversible.
Keyword polymer films
Q-Index Code C1
Q-Index Status Confirmed Code

 
Versions
Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 45 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 47 times in Scopus Article | Citations
Google Scholar Search Google Scholar
Created: Thu, 12 Nov 2009, 21:51:34 EST by Mr Andrew Martlew on behalf of School of Chemistry & Molecular Biosciences