Kinetic Model for H2S Adsorption on NiO Surface in Resistive MEMS Gas Sensors: Coupling Mass Transfer, Multisite Adsorption, and Surface Interactions

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Main Authors: Kondrateva, Anastasia, Mishin, Maxim, Goltaev, Igor
Format: Recurso digital
Published: Zenodo 2026
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author Kondrateva, Anastasia
Mishin, Maxim
Goltaev, Igor
author_facet Kondrateva, Anastasia
Mishin, Maxim
Goltaev, Igor
contents <p>Heterogeneous processes at gas--solid interfaces in resistive gas sensors involve external diffusion, multisite adsorption, surface migration and desorption, often complicated by site heterogeneity and lateral interactions. In this work, we develop a non-equilibrium kinetic framework that explicitly couples external mass transfer to multisite Langmuir--Hinshelwood adsorption–desorption with lateral adsorbate interactions and surface diffusion. The model is constructed to factorise material-specific (NiO site types and morphology), analyte-specific (molecular versus dissociative H2S adsorption and concentration-dependent desorption) and transport-specific (MEMS-based gas delivery and mass-transfer limitations) contributions, which enables transfer of kinetic parameters across different sensing layers, morphologies and analytes. Validation on a MEMS-based NiO sensor for H2S demonstrates that only a model including dissociative adsorption, chemisorption with long-lived sulfur-containing species and concentration-dependent desorption can reproduce the experimentally observed multistage transients and apparent relaxation times. By linking surface coverage dynamics directly to conductivity via a morphology-dependent power-law relation, the framework bridges microscopic surface chemistry and macroscopic sensor signal, providing a physically grounded alternative to phenomenological relaxation models and a tool for generating synthetic training data for electronic-nose applications.</p>
format Recurso digital
id zenodo_https___doi_org_10_1039_D5CP04688B
institution Zenodo
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publishDate 2026
publisher Zenodo
record_format zenodo
spellingShingle Kinetic Model for H2S Adsorption on NiO Surface in Resistive MEMS Gas Sensors: Coupling Mass Transfer, Multisite Adsorption, and Surface Interactions
Kondrateva, Anastasia
Mishin, Maxim
Goltaev, Igor
<p>Heterogeneous processes at gas--solid interfaces in resistive gas sensors involve external diffusion, multisite adsorption, surface migration and desorption, often complicated by site heterogeneity and lateral interactions. In this work, we develop a non-equilibrium kinetic framework that explicitly couples external mass transfer to multisite Langmuir--Hinshelwood adsorption–desorption with lateral adsorbate interactions and surface diffusion. The model is constructed to factorise material-specific (NiO site types and morphology), analyte-specific (molecular versus dissociative H2S adsorption and concentration-dependent desorption) and transport-specific (MEMS-based gas delivery and mass-transfer limitations) contributions, which enables transfer of kinetic parameters across different sensing layers, morphologies and analytes. Validation on a MEMS-based NiO sensor for H2S demonstrates that only a model including dissociative adsorption, chemisorption with long-lived sulfur-containing species and concentration-dependent desorption can reproduce the experimentally observed multistage transients and apparent relaxation times. By linking surface coverage dynamics directly to conductivity via a morphology-dependent power-law relation, the framework bridges microscopic surface chemistry and macroscopic sensor signal, providing a physically grounded alternative to phenomenological relaxation models and a tool for generating synthetic training data for electronic-nose applications.</p>
title Kinetic Model for H2S Adsorption on NiO Surface in Resistive MEMS Gas Sensors: Coupling Mass Transfer, Multisite Adsorption, and Surface Interactions
url https://doi.org/10.1039/D5CP04688B