Anomalous vapor sensor response of a fluorinated alkylthiol-protected gold nanoparticle film
Langmuir, 2009•ACS Publications
Monolayer-protected gold nanoparticle films generally swell and increase their electrical
resistance when exposed to organic vapors. Films of gold nanoparticles protected by 1 H, 1
H, 2 H, 2 H-perfluorodecanethiol (PFDT) exhibit an anomalous response in which the
resistance decreases for all vapors investigated. Electron microscopy illustrates that the
PFDT-functionalized gold nanoparticles are hexagonally ordered with an interparticle
separation of 3 nm. Quartz crystal microbalance measurements confirm substantial mass …
resistance when exposed to organic vapors. Films of gold nanoparticles protected by 1 H, 1
H, 2 H, 2 H-perfluorodecanethiol (PFDT) exhibit an anomalous response in which the
resistance decreases for all vapors investigated. Electron microscopy illustrates that the
PFDT-functionalized gold nanoparticles are hexagonally ordered with an interparticle
separation of 3 nm. Quartz crystal microbalance measurements confirm substantial mass …
Monolayer-protected gold nanoparticle films generally swell and increase their electrical resistance when exposed to organic vapors. Films of gold nanoparticles protected by 1H,1H,2H,2H-perfluorodecanethiol (PFDT) exhibit an anomalous response in which the resistance decreases for all vapors investigated. Electron microscopy illustrates that the PFDT-functionalized gold nanoparticles are hexagonally ordered with an interparticle separation of 3 nm. Quartz crystal microbalance measurements confirm substantial mass uptake, but the relatively large interparticle separation and insulating properties of the gold particles lead to a porous film whose electrical resistance is strongly influenced by changes in the relative permittivity and reversible, vapor-induced changes in film morphology.
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