Aerosol-Printed MoS Ink As a High Sensitivity Humidity Sensor

Overview

Journal ACS Omega

Publisher American Chemical Society

Specialty Chemistry

Date 2022 Mar 31

PMID 35356695

Authors

Neuma M Pereira

Natalia P Rezende

Thiago H R Cunha

Ana P M Barboza

Glaura G Silva

Daniel Lippross

Bernardo R A Neves

Helio Chacham

Andre S Ferlauto

Rodrigo G Lacerda

Affiliations

Soon will be listed here.

Abstract

Molybdenum disulfide (MoS) is attractive for use in next-generation nanoelectronic devices and exhibits great potential for humidity sensing applications. Herein, MoS ink was successfully prepared via a simple exfoliation method by sonication. The structural and surface morphology of a deposited ink film was analyzed by scanning electron microscopy (SEM), Raman spectroscopy, and atomic force microscopy (AFM). The aerosol-printed MoS ink sensor has high sensitivity, with a conductivity increase by 6 orders of magnitude upon relative humidity increase from 10 to 95% at room temperature. The sensor also has fast response/recovery times and excellent repeatability. Possible mechanisms for the water-induced conductivity increase are discussed. An analytical model that encompasses two ionic conduction regimes, with a percolation transition to an insulating state below a low humidity threshold, describes the sensor response successfully. In conclusion, our work provides a low-cost and straightforward strategy for fabricating a high-performance humidity sensor and fundamental insights into the sensing mechanism.

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