期刊
ACS APPLIED MATERIALS & INTERFACES
卷 9, 期 46, 页码 40593-40603出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b11317
关键词
metal-organic framework; Co3O4 nanocubes; carbon nanotube; metal mesh; flexible gas sensor
资金
- Wearable Platform Materials Technology Center (WMC) - National Research Foundation of Korea (NRF) Grant of the Korean Government (MSIP) [2016R1A5A1009926]
- Nano Material Technology Development Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT and Future Planning [2016M3A7B4905609]
- National Research Foundation of Korea (NRF) grant - Korea government (MSIP) [2016RIA2B3015400]
- National Research Foundation (NRF) of Korea grant - Ministry of Science, ICT and Future Planning [NRF-2015RIA2A1A16074901]
- Korea Evaluation Institute of Industrial Technology (KEIT) [N0002418] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Detection and control of air quality are major concerns in recent years for environmental monitoring and healthcare. In this work, we developed an integrated sensor architecture comprised of nanostructured composite sensing layers and a flexible heating substrate for portable and real-time detection of nitrogen dioxide (NO2). As sensing layers, PdO-infiltrated Co3O4 hollow nanocubes (PdO-Co3O4 HNCs) were prepared by calcination of Pd-embedded Co-based metal organic framework polyhedron particles. Single-walled carbon nanotubes (SWCNTs) were functionalized with PdO-Co3O4 HNCs to control conductivity of sensing layers. As a flexible heating substrate, the Ni mesh electrode covered with a 40 nm thick Au layer (i.e., Ni(core)/Au(shell) mesh) was embedded in a colorless polyimide (cPI) film. As a result, SWCNT-functionalized PdO-Co3O4 HNCs sensor exhibited improved NO2 detection property at 100 degrees C, with high sensitivity (S) of 44.11% at 20 ppm and a low detection limit of 1 ppm. The accelerated reaction and recovery kinetics toward NO2 of SWCNT-functionalized PdO-Co3O4 HNCs were achieved by generating heat on the Ni(core)/Au(shell) mesh embedded cPI substrate. The SWCNT-functionalized porous metal oxide sensing layers integrated on the mechanically stable Ni(core)/Au(shell) mesh heating substrate can be envisioned as an essential sensing platform for realization of low-temperature operation wearable chemical sensor.
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