Controlled exfoliation of molybdenum disulfide for developing thin film humidity sensor

Shao Lin Zhang; Hyang Hee Choi; Hong Yan Yue; Woo Chul Yang

doi:10.1016/j.cap.2013.11.031

Controlled exfoliation of molybdenum disulfide for developing thin film humidity sensor

Shao Lin Zhang, Hyang Hee Choi, Hong Yan Yue, Woo Chul Yang

Department of Physics

Research output: Contribution to journal › Article › peer-review

130 Scopus citations

Abstract

We report a facile, size-controllable exfoliation process using an ultrasound-assisted liquid method to fabricate few-layer molybdenum disulfide (MoS₂) nanosheets. The morphology, structure and size distribution of the nanosheets processed with different ultrasonic powers were examined by atomic force microscopy, Raman spectroscopy and dynamic light scattering. It was revealed that the size of nanosheets reduces and final yield increases with elevating ultrasonic power. Bulk and exfoliated MoS₂ based thin film sensors are fabricated by a simple drop casting method on alumina substrates. Our sensors exhibit excellent sensitivity with very quick response and recovery speed to humidity gas. Comparative studies are carried out to draw up the size or ultrasonic power dependent sensing behavior.

Original language	English
Pages (from-to)	264-268
Number of pages	5
Journal	Current Applied Physics
Volume	14
Issue number	3
DOIs	https://doi.org/10.1016/j.cap.2013.11.031
State	Published - Mar 2014

Keywords

Dynamic light scattering
Humidity sensor
Liquid exfoliation
Molybdenum disulfide
Ultrasonic power

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10.1016/j.cap.2013.11.031

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title = "Controlled exfoliation of molybdenum disulfide for developing thin film humidity sensor",

abstract = "We report a facile, size-controllable exfoliation process using an ultrasound-assisted liquid method to fabricate few-layer molybdenum disulfide (MoS2) nanosheets. The morphology, structure and size distribution of the nanosheets processed with different ultrasonic powers were examined by atomic force microscopy, Raman spectroscopy and dynamic light scattering. It was revealed that the size of nanosheets reduces and final yield increases with elevating ultrasonic power. Bulk and exfoliated MoS2 based thin film sensors are fabricated by a simple drop casting method on alumina substrates. Our sensors exhibit excellent sensitivity with very quick response and recovery speed to humidity gas. Comparative studies are carried out to draw up the size or ultrasonic power dependent sensing behavior.",

keywords = "Dynamic light scattering, Humidity sensor, Liquid exfoliation, Molybdenum disulfide, Ultrasonic power",

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AU - Zhang, Shao Lin

AU - Choi, Hyang Hee

AU - Yue, Hong Yan

AU - Yang, Woo Chul

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AB - We report a facile, size-controllable exfoliation process using an ultrasound-assisted liquid method to fabricate few-layer molybdenum disulfide (MoS2) nanosheets. The morphology, structure and size distribution of the nanosheets processed with different ultrasonic powers were examined by atomic force microscopy, Raman spectroscopy and dynamic light scattering. It was revealed that the size of nanosheets reduces and final yield increases with elevating ultrasonic power. Bulk and exfoliated MoS2 based thin film sensors are fabricated by a simple drop casting method on alumina substrates. Our sensors exhibit excellent sensitivity with very quick response and recovery speed to humidity gas. Comparative studies are carried out to draw up the size or ultrasonic power dependent sensing behavior.

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Controlled exfoliation of molybdenum disulfide for developing thin film humidity sensor

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