A silver nanoparticle-anchored UiO-66(Zr) metal–organic framework (MOF)-based capacitive H2S gas sensor. Issue 47 (15th November 2019)

• Record Type: Journal Article
• Authors: Surya, Sandeep G.; Bhanoth, Sreenu; Majhi, Sanjit M.; More, Yogeshwar D.; Teja, V. Mani; Chappanda, Karumbaiah N.
• Is Part Of: CrystEngComm. Volume 21:Issue 47(2019)
• Page Start: 7303
• Page End: 7312
• Publication Date: 2019-11-15
• Subjects: Crystals -- Periodicals; Crystal growth -- Periodicals; Crystallography -- Periodicals; Cristaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Cristallographie -- Périodiques; 548
• DOI: 10.1039/c9ce01323g
• Languages: English
• ISSNs: 1466-8033

Abstract

Abstract : Metal–organic frameworks anchored with metal oxide nanoparticles for the detection of H2 S gas with enhanced sensitivity. Abstract : Hydrogen sulfide (H2 S) 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 H2 S 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 H2 S sensing for the first time using metal–organic frameworks (MOFs) decorated with silver oxide (Ag2 O) nanoparticles as the sensing materials. The nanoparticles were deposited on three MOFs (UiO-66(Zr) BDC, UiO-66(Zr) BDC-NO2, and UiO-66(Zr) BDC-N3 ) 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-NO2 loaded with Ag2 O showed the highest sensitivity towards H2 S. The optimized MOF–Ag2 O composite demonstrated experimental LOD of 1 ppm of H2 S at room temperature, showing high chemical absorption affinity towards H2 S. The work presented here is promising for developing sensitive H2 S sensors and in addition paves the way to explore and develop other possible MOF-based composite materials for gas sensing applications.