Photoacoustic investigation of nanoparticles ultra-thin films
Résumé
Ultrathin metal nanoparticles coatings are emerging as go-to materials in a variety of fields ranging from pathogens control [1] to sensing. Accessing their mechanical properties is a crucial issue limiting their exploitation in real-life applications. The mechanical properties of metallic nanogranular thin films are unveiled exploiting ultrafast photoacoustic nanometrology in conjunction with bottom-up and top-down approaches based on more traditional techniques [2,3]. Analytical homogenization methods are introduced, allowing to rationalise, in an easy-to- adopt scheme, both the films vibration freqeuncies and radiation damping. The latter yields important information on the granular?s films interfacial layer morphology. Building on the acquired knowledge a variety of applications are proposed, ranging from nano-fluid infiltration sensing [4] to gas-phase separation [5] and bendable electronics [6]. References [1] G. Benetti, E. Cavaliere, R. Brescia, S. Salassi et al., Nanoscale, 11, 1626, 2019 [2] S. Peli, E. Cavaliere et al., J. Phys. Chem. C, 120, 4673, 2016 [3] G. Benetti, C. Caddeo C. Melis et al., J. Phys. Chem. C, 121, 22434, 2017 [4] G. Benetti, M. Gandolfi et al., ACS Appl. Mater. Interfaces, 10, 27947, 2018 [5] G. Torrisi, E. Cavaliere et al., Sol. Energy Mater. Sol. Cells, 199, 114, 2019
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