石墨烯
材料科学
异质结
碳化硅
光电子学
纳米技术
半导体
检出限
复合材料
化学
色谱法
作者
P. Roy,Golam Haider,Tsu‐Chin Chou,Kuei‐Hsien Chen,Li‐Chyong Chen,Yang‐Fang Chen,Chi‐Te Liang
出处
期刊:ACS Sensors
[American Chemical Society]
日期:2019-01-21
卷期号:4 (2): 406-412
被引量:43
标识
DOI:10.1021/acssensors.8b01312
摘要
Gas sensors, which play an important role in the safety of human life, cover a wide range of applications including intelligent systems and detection of harmful and toxic gases. It is known that graphene is an ideal and attractive candidate for gas sensing due to its high surface area and excellent mechanical, electrical, optical, and thermal properties. However, in order to fully realize its potential as a commercial gas sensor, demand for a graphene-based device of low-limit detection, high sensitivity, and fast response time needs to be met. Here, we demonstrate a metal/insulator/semiconductor (MIS) based gas sensor consisting of as-grown epitaxial graphene nanowalls (EGNWs)/silicon carbide (SiC)/silicon (Si) structure. The unique edge dominant three-dimensional (3D) EGNWs based MIS device achieved an extraordinarily low limit of detection (0.5 ppm) and unprecedented sensitivity (82 μA/ppm/cm2 for H2) with a fast response of shorter than 500 ms. These unique properties of our MIS device are attributed to the abundance of vertically oriented nanographitic edges and structural defects that act as extra-favorable adsorption sites and exhibit fast electron-transfer kinetics through the edges. Our experimental findings can pave the way for the realization of high-performance 3D graphene-based gas sensor devices.
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