Humidity and CO2 gas sensing properties of double-layer graphene

被引：77

作者：

Fan, Xuge ^{[1
]}

Elgammal, Karim ^{[4
,6
]}

Smith, Anderson D. ^{[2
]}

Ostling, Mikael ^{[2
]}

Delin, Anna ^{[4
,5
,6
]}

Lemme, Max C. ^{[2
,3
]}

Niklaus, Frank ^{[1
]}

机构：

[1] KTH Royal Inst Technol, Sch Elect Engn, Dept Micro & Nanosyst, SE-10044 Stockholm, Sweden

[2] KTH Royal Inst Technol, Sch Informat & Commun Technol, Dept Integrated Devices & Circuits, SE-16440 Kista, Sweden

[3] Rhein Westfal TH Aachen, Dept Elect Devices, D-52074 Aachen, Germany

[4] KTH Royal Inst Technol, Sch Engn Sci, Dept Appl Phys, Elect 229, SE-16440 Kista, Sweden

[5] Uppsala Univ, Mat Theory Div, Dept Phys & Astron, Box 516, SE-75120 Uppsala, Sweden

[6] KTH Royal Inst Technol, Swedish E Sci Res Ctr SeRC, SE-10044 Stockholm, Sweden

来源：

CARBON | 2018年 / 127卷

基金：

欧洲研究理事会;

关键词：

QUANTUM DOTS; OXIDE; SENSORS; FILMS; SENSITIVITY; FABRICATION; ADSORPTION; MECHANISM; MEMBRANE; NO2;

D O I：

10.1016/j.carbon.2017.11.038

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Graphene has interesting gas sensing properties with strong responses of the graphene resistance when exposed to gases. However, the resistance response of double-layer graphene when exposed to humidity and gasses has not yet been characterized and understood. In this paper we study the resistance response of double-layer graphene when exposed to humidity and CO2, respectively. The measured response and recovery times of the graphene resistance to humidity are on the order of several hundred milliseconds. For relative humidity levels of less than similar to 3% RH, the resistance of double-layer graphene is not significantly influenced by the humidity variation. We use such a low humidity atmosphere to investigate the resistance response of double-layer graphene that is exposed to pure CO2 gas, showing a consistent response and recovery behaviour. The resistance of the double-layer graphene decreases linearly with increase of the concentration of pure CO2 gas. Density functional theory simulations indicate that double-layer graphene has a weaker gas response compared to single-layer graphene, which is in agreement with our experimental data. Our investigations contribute to improved understanding of the humidity and CO2 gas sensing properties of double-layer graphene which is important for realizing viable graphene-based gas sensors in the future. (C) 2017 Elsevier Ltd. All rights reserved.

引用

页码：576 / 587

页数：12

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