am8b07925_si_001.pdf (784.78 kB)
Photoacoustic Sensing of Trapped Fluids in Nanoporous Thin Films: Device Engineering and Sensing Scheme
journal contribution
posted on 2018-07-24, 00:00 authored by Giulio Benetti, Marco Gandolfi, Margriet J. Van Bael, Luca Gavioli, Claudio Giannetti, Claudia Caddeo, Francesco BanfiAccessing fluid infiltration
in nanogranular coatings is an outstanding
challenge, of relevance for applications ranging from nanomedicine
to catalysis. A sensing platform, allowing quantifying the amount
of fluid infiltrated in a nanogranular ultrathin coating, with thickness
in the 10–40 nm range, is here proposed and theoretically investigated
by multiscale modeling. The scheme relies on impulsive photoacoustic
excitation of hypersonic mechanical breathing modes in engineered
gas-phase-synthesized nanogranular metallic ultrathin films and time-resolved
acousto-optical read-out of the breathing modes frequency shift upon
liquid infiltration. A superior sensitivity, exceeding 26 × 103 cm2/g, is predicted upon equivalent areal mass
loading of a few ng/mm2. The capability of the present
scheme to discriminate among different infiltration patterns is discussed.
The platform is an ideal tool to investigate nanofluidics in granular
materials and naturally serves as a distributed nanogetter coating,
integrating fluid sensing capabilities. The proposed scheme is readily
extendable to other nanoscale and mesoscale porous materials.
History
Usage metrics
Categories
Keywords
equivalent areal mass loadingtime-resolved acousto-optical read-outnanogranular ultrathin coatinggas-phase-synthesized nanogranularplatforminfiltration patternsScheme Accessing fluid infiltrationnanogranular coatingsmaterialnanogetter coatingbreathing modes frequency shiftDevice Engineeringschemeultrathin filmsmultiscale modelingcapabilityphotoacoustic excitationbreathing modes
Licence
Exports
RefWorks
BibTeX
Ref. manager
Endnote
DataCite
NLM
DC