Highly selective and ultra-low power consumption metal oxide based hydrogen gas sensor employing graphene oxide as molecular sieve

SENSORS AND ACTUATORS B-CHEMICAL

卷:320

Article

Rasch, Florian¹  Postica, Vasile²  Schutt, Fabian¹  Mishra, Yogendra Kumar³  Nia, Ali Shaygan⁴  Lohe, Martin R.⁴  Feng, Xinliang⁴  Adelung, Rainer¹  Lupan, Oleg^1,2 

[1] Univ Kiel, Inst Mat Sci, Funct Nanomat, Fac Engn, Kaisers Str 2, D-24143 Kiel, Germany

[2] Tech Univ Moldova, Dept Microelect & Biomed Engn, Ctr Nanotechnol & Nanosensors, 168 Stefan Cel Mare Av, MD-2004 Kishinev, Moldova

[3] Univ Southern Denmark, NanoSYD, Mads Clausen Inst, Alsion 2, DK-6400 Sonderborg, Denmark

[4] Tech Univ Dresden, Dept Chem & Food Chem, Ctr Adv Elect Dresden, D-01062 Dresden, Germany

关键词: Graphene oxide;    Molecular sieving;    Hydrogen gas sensors;    2D nanomaterials;    Zinc oxide;   

DOI  :  10.1016/j.snb.2020.128363

来源: Elsevier

【 摘 要 】

The excellent gas sensing performance of metal oxide based nano- and microstructures, including a fast response time and good sensitivity, is typically limited by their low selectivity. Therefore, novel approaches and strategies are required to gain a precise control of the selectivity. Here, we introduce a nanoporous few-layer graphene oxide (GO) membrane with permeability only to specific gas molecules to improve the selectivity of individual zinc oxide microwires (ZnO MWs) toward hydrogen (H-2) gas. The fabricated GO-covered ZnO MWs showed ultra-low power consumption (60-200 nW) and an excellent room temperature H-2 gas sensing properties with fast response (114 s) and recovery (30 s) times, and a low detection limit of similar to 4 ppm, while no gas response was measured to all other tested gases. As proposed, the gas sensing mechanism is based on selective sieving of H-2 gas molecules through the GO membrane and further diffusion to the Schottky contacts, resulting in a decreased barrier height. Being based on a bottom-up fabrication approach, the presented results could have great potential for further technological applications such as high-performance and highly selective ultra-low power metal oxide-based gas sensors, opening new opportunities for the design of nanosensors and their integration in wireless and portable devices.

【 授权许可】

Free