Aerosol-printed MoS2 ink as a high sensitivity humidity sensor.

• Autor(a) principal: Pereira, Neuma das Mercês
• Data de Publicação: 2022
• Outros Autores: Rezende, Natália Pereira, Cunha, Thiago Henrique Rodrigues da, Barboza, Ana Paula Moreira, Silva, Glaura Goulart, Lippross, Daniel, Neves, Bernardo Ruegger Almeida, Chacham, Helio, Ferlauto, Andre Santarosa, Lacerda, Rodrigo Gribel
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UFOP
• Texto Completo: http://www.repositorio.ufop.br/jspui/handle/123456789/15990; https://doi.org/10.1021/acsomega.1c06525

Molybdenum disulfide (MoS2) is attractive for use in nextgeneration nanoelectronic devices and exhibits great potential for humidity sensing applications. Herein, MoS2 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 MoS2 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 highperformance humidity sensor and fundamental insights into the sensing mechanism.