Aerosol-printed MoS2 ink as a high sensitivity humidity sensor
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Universidade Federal de Minas Gerais
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Artigo de periódico
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Molybdenum disulfide (MoS2) is attractive for use in next-generation nanoelectronic devices and exhibits great potential for humiditysensing applications. Herein, MoS2ink was successfully prepared via asimple exfoliation method by sonication. The structural and surfacemorphology of a deposited inkfilm was analyzed by scanning electronmicroscopy (SEM), Raman spectroscopy, and atomic force microscopy(AFM). The aerosol-printed MoS2ink sensor has high sensitivity, with aconductivity increase by 6 orders of magnitude upon relative humidityincrease from 10 to 95% at room temperature. The sensor also has fastresponse/recovery times and excellent repeatability. Possible mechanismsfor the water-induced conductivity increase are discussed. An analyticalmodel that encompasses two ionic conduction regimes, with a percolationtransition to an insulating state below a low humidity threshold, describesthe 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.
Abstract
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Condutividade elétrica, Umidade, Detectores
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Electrical conductivity, Electrical properties, Humidity, Layers, Sensors
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https://pubs.acs.org/doi/full/10.1021/acsomega.1c06525