Photoacoustic Sensing of Trapped Fluids in Nanoporous Thin Films: Device Engineering and Sensing Scheme

Luca Gavioli, Claudio Giannetti, Francesco Banfi, Giulio Benetti, Marco Gandolfi, Claudia Caddeo, Margriet J. Van Bael

Risultato della ricerca: Contributo in rivistaArticolo in rivistapeer review

9 Citazioni (Scopus)

Abstract

Accessing 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.
Lingua originaleEnglish
pagine (da-a)27947-27954
Numero di pagine8
RivistaACS APPLIED MATERIALS & INTERFACES
Volume10
DOI
Stato di pubblicazionePubblicato - 2018

Keywords

  • Ag nanoparticles
  • Materials Science (all)
  • getter materials
  • granular materials
  • mass sensing
  • molecular dynamics
  • nanofluidics
  • nanomechanics
  • nanoporosity
  • ultrafast opto-mechanics
  • wettability

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