Metal-Organic Framework-Templated PdO-Co3O4 Nanocubes Functionalized by SWCNTs: Improved NO2 Reaction Kinetics on Flexible Heating Film

Seon Jin Choi, Hak Jong Choi, Won Tae Koo, Daihong Huh, Heon Lee, Il Doo Kim

    Research output: Contribution to journalArticlepeer-review

    66 Citations (Scopus)

    Abstract

    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 °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.

    Original languageEnglish
    Pages (from-to)40593-40603
    Number of pages11
    JournalACS Applied Materials and Interfaces
    Volume9
    Issue number46
    DOIs
    Publication statusPublished - 2017 Nov 22

    Bibliographical note

    Funding Information:
    This work was supported by Wearable Platform Materials Technology Center (WMC) funded by the National Research Foundation of Korea (NRF) Grant of the Korean Government (MSIP; No. 2016R1A5A1009926). This research was supported by Nano·Material Technology Development Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT and Future Planning (2016M3A7B4905609), the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIP) (2016R1A2B3015400), and National Research Foundation (NRF) of Korea grant funded by the Ministry of Science, ICT and Future Planning (NRF-2015R1A2A1A16074901).

    Funding Information:
    This work was supported by Wearable Platform Materials Technology Center (WMC) funded by the National Research Foundation of Korea (NRF) Grant of the Korean Government (MSIP; No. 2016R1A5A1009926). This research was supported by Nano-Material Technology Development Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT and Future Planning (2016M3A7B4905609) the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIP) (2016R1A2B3015400), and National Research Foundation (NRF) of Korea grant funded by the Ministry of Science, ICT and Future Planning (NRF-2015R1A2A1A16074901).

    Publisher Copyright:
    © 2017 American Chemical Society.

    Keywords

    • CoO nanocubes
    • carbon nanotube
    • flexible gas sensor
    • metal mesh
    • metal-organic framework

    ASJC Scopus subject areas

    • General Materials Science

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