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

다국어 초록 (Multilingual Abstract)

To date, chemoresistive gas sensors based on metal oxide semiconductors (MOS) have been the most attractive sensor typesfor the practical application. However, with the emerging concept of Internet of Everything, high operating temperaturesover 300 °C of the gas sensors based on MOS must be reduced to achieve low power consumption and overcome a limitedbattery capacity of mobile devices. The 2-dimensional materials like MoS 2 have been, therefore, one of the most recentlystudied materials for gas sensors with capability of operation at signifi cantly lower temperatures. However, lacking selectivitytoward various target gas species limited their application to gas sensors. Herein, we investigated the eff ects of noblemetals (Pd and Au) decoration on the gas sensing properties of MoS 2 thin fi lms. Due to the electronic sensitization of thenoble metal catalysts and the formation of Pd hydride, overall gas responses and selectivity were signifi cantly improvedtoward tests gas species. These results provide clear understandings on the eff ects of the surface noble metal catalysts ongas sensing properties of MoS 2 .

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