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A silver nanoparticle-anchored UiO-66(Zr) metal-organic framework (MOF)-based capacitive HS gas sensor

CrystEngComm, ISSN: 1466-8033, Vol: 21, Issue: 47, Page: 7303-7312
2019
  • 67
    Citations
  • 0
    Usage
  • 64
    Captures
  • 0
    Mentions
  • 72
    Social Media
Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    67
    • Citation Indexes
      67
  • Captures
    64
  • Social Media
    72
    • Shares, Likes & Comments
      72
      • Facebook
        72

Article Description

Hydrogen sulfide (HS) is a highly poisonous gas; if present in a workplace, it must be identified immediately at concentrations greater than 10 ppm. Although there are numerous reports on sensing HS gas using various techniques and approaches, there still exists a gap in terms of the limit of detection (LOD) and feasibility. In this work, we demonstrated capacitive HS sensing for the first time using metal-organic frameworks (MOFs) decorated with silver oxide (AgO) nanoparticles as the sensing materials. The nanoparticles were deposited on three MOFs (UiO-66(Zr) BDC, UiO-66(Zr) BDC-NO, and UiO-66(Zr) BDC-N) using the impregnation technique. The sensing materials were characterized for morphology using X-ray diffraction, scanning electron microscopy, and X-ray photoelectron spectroscopy techniques. The synthesized MOFs were coated on interdigitated electrode capacitors as the dielectric materials and a comparison of their sensing properties was presented; among them, UiO-66(Zr) BDC-NO loaded with AgO showed the highest sensitivity towards HS. The optimized MOF-AgO composite demonstrated experimental LOD of 1 ppm of HS at room temperature, showing high chemical absorption affinity towards HS. The work presented here is promising for developing sensitive HS sensors and in addition paves the way to explore and develop other possible MOF-based composite materials for gas sensing applications.

Bibliographic Details

Sandeep G. Surya; Sanjit M. Majhi; V. Mani Teja; Karumbaiah N. Chappanda; Sreenu Bhanoth; Yogeshwar D. More

Royal Society of Chemistry (RSC)

Chemistry; Materials Science; Physics and Astronomy

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