Chemical Sensing of 2D Graphene/MoS2 Heterostructure device

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• 作者：Byungjin Cho ; Jongwon Yoon ; Sung Kwan Lim ; Ah Ra Kim ; Dong-Ho Kim ; Sung-Gyu Park ; Jung-Dae Kwon ; Young-Joo Lee ; Kyu-Hwan Lee ; Byoung Hun Lee ; Heung Cho Ko ; Myung Gwan Hahm
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：August 5, 2015
• 年：2015
• 卷：7
• 期：30
• 页码：16775-16780
• 全文大小：340K
• ISSN：1944-8252

文摘

We report the production of a two-dimensional (2D) heterostructured gas sensor. The gas-sensing characteristics of exfoliated molybdenum disulfide (MoS₂) connected to interdigitated metal electrodes were investigated. The MoS₂ flake-based sensor detected a NO₂ concentration as low as 1.2 ppm and exhibited excellent gas-sensing stability. Instead of metal electrodes, patterned graphene was used for charge collection in the MoS₂-based sensing devices. An equation based on variable resistance terms was used to describe the sensing mechanism of the graphene/MoS₂ device. Furthermore, the gas response characteristics of the heterostructured device on a flexible substrate were retained without serious performance degradation, even under mechanical deformation. This novel sensing structure based on a 2D heterostructure promises to provide a simple route to an essential sensing platform for wearable electronics.