Synthesis of ZnO Nanoparticles onto Sepiolite Needles and Determination of Their Sensitivity toward Humidity, NO2 and H2

doi:10.1016/j.jmst.2016.03.008

Abstract

Abstract: This work investigated the sensitivity toward humidity, NO₂ and H₂ of ZnO modified sepiolite (Si₁₂Mg₈O₃₀(OH)₄.(H₂O)₄⋅8H₂O). To this aim, sepiolite powder was first modified by leaching magnesium ions in HCl then by precipitating nano-sized Zn-based compounds under basic conditions. A subsequent thermal treatment at 550?°C for 1 h was performed. The powders were characterized by X-ray diffraction (XRD), specific surface area measurements, thermogravimetric and differential thermal analysis and field emission scanning electron microscopy, as well as high resolution transmission electron microscopy. The XRD patterns showed that all leached heat treated samples were made of anhydrous sepiolite and of ZnO. Sensors were then obtained by screen printing these materials onto commercial alumina substrates with Pt electrodes. All the investigated compositions were capable of detecting NO₂ down to ppm level and 20?ppm H₂, at an optimal working temperature of 300?°C. These detection limits are in line with the current best results reported in literature.

Key words: Clay minerals, Gas sensor, Sensitivity, Hydrogen sensor, Nitrogen, Oxide

M. Hassan, Ahmed S. Afify, J.M. Tulliani. Synthesis of ZnO Nanoparticles onto Sepiolite Needles and Determination of Their Sensitivity toward Humidity, NO₂ and H₂[J]. J. Mater. Sci. Technol., 2016, 32(6): 573-582.

Figures/Tables 10

XRD patterns of as-received sepiolite (S0) and ZnO-doped sepiolite treated at pH 0 for 2?h (S2), 6?h (S6) and 24?h (S24), while (*

) refers to sepiolite peaks (JCPDS card No. 13-0595 for sepiolite), (§

) refers to anhydride sepiolite[14] and (+) refers to ZnO phase (JCPDS card No. 36-1451).

TG-DTA of pure sepiolite (S0).

TG-DTA of S2 powder.

FE-SEM micrographs of powders sepiolite as received (a, b), S2 (c, d), S6 (e, f) and S24 (g, h).

FE-SEM micrograph of S2 powder (a), EDX spectrum (b) and Mg and Zn map (c) of the same zone.

HR-TEM micrographs of powder S2 (a, b), and detail of ZnO nanoparticles on a S2 grain (c, d).

Sensors response in function of RH.

FE-SEM micrograph of screen printed S2 film at different magnification.

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Synthesis of ZnO Nanoparticles onto Sepiolite Needles and Determination of Their Sensitivity toward Humidity, NO₂ and H₂

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