Liquid-dependent impedance induced by vapor condensation and percolation in nanoparticle film

Shinya Kano; Harutaka Mekaru

doi:10.1088/1361-6528/ac3d63

Liquid-dependent impedance induced by vapor condensation and percolation in nanoparticle film

Nanotechnology. 2021 Dec 13;33(10). doi: 10.1088/1361-6528/ac3d63.

Authors

Shinya Kano^{1

2}, Harutaka Mekaru^{1

2}

Affiliations

¹ Human Augmentation Research Center, National Institute of Advanced Industrial Science and Technology (AIST), Kashiwa 270-0882, Japan.
² Sensing System Research Center, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8564, Japan.

PMID: 34823238
DOI: 10.1088/1361-6528/ac3d63

Abstract

A liquid-dependent impedance is observed by vapor condensation and percolation in the void space between nanoparticles. Under the Laplace pressure, vapor is effectively condensed into liquid to fill the nanoscale voids in an as-deposited nanoparticle film. Specifically, the transient impedance of the nanoparticle film in organic vapor is dependent on the vapor pressure and the conductivity of the condensed liquid. The response follows a power law that can be explained by the classical percolation theory. The condensed vapor gradually percolates into the void space among nanoparticles. A schematic is proposed to describe the vapor condensation and percolation dynamics among the nanoparticles. These findings offer insights into the behavior of vapor adsorbates in nanomaterial assemblies that contain void space.

Keywords: capillary condensation; impedance; nanoparticles; percolation theory; vapor.