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Electronic Materials Letters

, Volume 15, Issue 3, pp 368–376 | Cite as

Pd- and Au-Decorated MoS2 Gas Sensors for Enhanced Selectivity

  • Jun Min Suh
  • Young-Seok Shim
  • Ki Chang Kwon
  • Jong-Myeong Jeon
  • Tae Hyung Lee
  • Mohammadreza Shokouhimehr
  • Ho Won JangEmail author
Original Article - Nanomaterials
  • 209 Downloads

Abstract

To date, chemoresistive gas sensors based on metal oxide semiconductors (MOS) have been the most attractive sensor types for the practical application. However, with the emerging concept of Internet of Everything, high operating temperatures over 300 °C of the gas sensors based on MOS must be reduced to achieve low power consumption and overcome a limited battery capacity of mobile devices. The 2-dimensional materials like MoS2 have been, therefore, one of the most recently studied materials for gas sensors with capability of operation at significantly lower temperatures. However, lacking selectivity toward various target gas species limited their application to gas sensors. Herein, we investigated the effects of noble metals (Pd and Au) decoration on the gas sensing properties of MoS2 thin films. Due to the electronic sensitization of the noble metal catalysts and the formation of Pd hydride, overall gas responses and selectivity were significantly improved toward tests gas species. These results provide clear understandings on the effects of the surface noble metal catalysts on gas sensing properties of MoS2.

Graphical abstract

Keywords

Molybdenum disulfide Gas sensor Noble metal catalyst Selectivity NO2 

Notes

Acknowledgements

This work was financially supported by the Basic Science Research Program (2017R1A2B3009135), Future Material Discovery Program (2016M3D1A1027666), and the Nano·Material Technology Development Program (2016M3A7B4910) through the National Research Foundation of Korea, and the International Energy Joint R&D Program of the Korea Institute of Energy Technology Evaluation and Planning (20168510011350). J. M. Suh acknowledges the Global Ph.D. Fellowship Program through the National Research Foundation of Korea funded by the Ministry of Education (2015H1A2A1033701).

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Copyright information

© The Korean Institute of Metals and Materials 2019

Authors and Affiliations

  1. 1.Department of Materials Science and Engineering, Research Institute of Advanced MaterialsSeoul National UniversitySeoulRepublic of Korea
  2. 2.Department of Materials Science and Engineering, Advanced Battery Center, KAIST Institute for the NanocenturyKAISTDaejeonRepublic of Korea
  3. 3.SZU-NUS Collaborative Innovation Center for Optoelectronic Science and Technology, College of Optoelectronic EngineeringShenzen UniversityShenzenChina
  4. 4.Fundamental Technology Group, Central R&D InstituteSamsung Electro-Mechanics Co.SuwonRepublic of Korea

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