Vapor Sensing Using Conjugated Molecule‐Linked Au Nanoparticles in a Silica Matrix

Dirk, Shawn M.; Howell, Stephen W.; Price, B. Katherine; Fan, Hongyou; Washburn, Cody; Wheeler, David R.; Tour, James M.; Whiting, Joshua; Simonson, R. Joseph; Pomposo, ed., Jose A.

doi:10.1155/2009/481270

Vapor Sensing Using Conjugated Molecule‐Linked Au Nanoparticles in a Silica Matrix

Journal Article · Mon Dec 29 23:00:00 EST 2008 · Journal of Nanomaterials

DOI:https://doi.org/10.1155/2009/481270· OSTI ID:1198237

Dirk, Shawn M.; Howell, Stephen W.; Price, B. Katherine; Fan, Hongyou; Washburn, Cody; Wheeler, David R.; Tour, James M.; Whiting, Joshua; Simonson, R. Joseph; Pomposo, ed., Jose A.

Cross‐linked assemblies of nanoparticles are of great value as chemiresistor‐type sensors. Herein, we report a simple method to fabricate a chemiresistor‐type sensor that minimizes the swelling transduction mechanism while optimizing the change in dielectric response. Sensors prepared with this methodology showed enhanced chemoselectivity for phosphonates which are useful surrogates for chemical weapons. Chemoselective sensors were fabricated using an aqueous solution of gold nanoparticles that were then cross‐linked in the presence of the silica precursor, tetraethyl orthosilicate with the α ‐, ω ‐dithiolate (which is derived from the in situ deprotection of 1,4‐di(Phenylethynyl‐4 ^′ ,4 ^″ ‐diacetylthio)‐benzene ( 1 ) with wet triethylamine). The cross‐linked nanoparticles and silica matrix were drop coated onto interdigitated electrodes having 8 μ m spacing. Samples were exposed to a series of analytes including dimethyl methylphosphonate (DMMP), octane, and toluene. A limit of detection was obtained for each analyte. Sensors assembled in this fashion were more sensitive to dimethyl methylphosphonate than to octane by a factor of 1000.

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Sponsoring Organization:: USDOE

OSTI ID:: 1198237

Journal Information:: Journal of Nanomaterials, Journal Name: Journal of Nanomaterials Journal Issue: 1 Vol. 2009; ISSN 1687-4110

Publisher:: Hindawi Publishing CorporationCopyright Statement

Country of Publication:: Egypt

Language:: English

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