Gas sensors based on CeO2 nanoparticles prepared by chemical precipitation method and their temperature-dependent selectivity towards H2S and NO2 gases

Oosthuizen, Dina N.; Motaung, David E.; Swart, H.C.

doi:10.1016/j.apsusc.2019.144356

Cited by 78 publications

(28 citation statements)

References 56 publications

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“…In the case of the O 1s XPS spectrum, the binding energies lower than 530 eV are usually assigned to oxygen from the lattice of the CeO 2 crystal, in our case, at around 527 eV and 529 eV (Figure 4). The peak at higher binding energies, in our case around 531 eV, is usually attributed to the weakly absorbed oxygen species on the surface of CeO 2 associated with Ce 3+ ions [39][40][41] (Figure 4). These cover anionic molecules, such as OH − groups, O 2− 2 , or neutral molecules, including chemisorbed water.…”

Section: X-ray Photoelectron Spectroscopymentioning

confidence: 63%

Revealing the Effect of Synthesis Conditions on the Structural, Optical, and Antibacterial Properties of Cerium Oxide Nanoparticles

Fifere¹,

Airinei²,

Dobromir

et al. 2021

Nanomaterials

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Cerium oxide nanoparticles were prepared by a precipitation method using Ce(IV) sulphate as precursor dispersed in glycerol with varying synthesis parameters such as temperature or precipitating agent. The structural and morphological characteristics of the obtained nanoparticles were investigated by X-ray diffraction, transmission electron microscopy, and diffuse reflectance spectroscopy. The crystallite size of the nanoparticles varied between 13 and 17 nm. The presence of Ce3+ and Ce4+ was proved by XPS data in the CeO2 samples and the conservation of the fluorite structure was evinced by X-ray diffractograms with a contraction of the lattice parameter, regardless of the size of the nanoparticle. From diffuse reflectance spectra, two band gap energy values for the direct transition were observed. Depending on the synthesis condition, the red shift of gap energy and the blue shift of Urbach energy with increasing content of Ce3+ were ascertained. The antibacterial tests revealed that the cerium oxide nanoparticles show good antimicrobial activity towards the common pathogens Escherichia coli and Staphylococcus aureus.

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Section: X-ray Photoelectron Spectroscopymentioning

confidence: 63%

Revealing the Effect of Synthesis Conditions on the Structural, Optical, and Antibacterial Properties of Cerium Oxide Nanoparticles

Fifere¹,

Airinei²,

Dobromir

et al. 2021

Nanomaterials

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“…Moreover, providing a cost-effective fabrication process for industrial perspectives should be considered. Various nanostructures, namely nanoparticles (NPs) [19,20], nanotubes (NTs) [21,22], nanowires (NWs) [23,24], and nanosheets (NSHs) [25,26], show good sensitivity to the different gases. Among all these nanostructures, silicon nanowires (SiNWs) have demonstrated substantial advantages due to their need for relatively standard processing techniques, which allows for integration with standard complementary metal oxide semiconductor (CMOS) processes for very large scale production [27,28].…”

Section: Introductionmentioning

confidence: 99%

Silicon Nanowires for Gas Sensing: A Review

et al. 2020

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The unique electronic properties of semiconductor nanowires, in particular silicon nanowires (SiNWs), are attractive for the label-free, real-time, and sensitive detection of various gases. Therefore, over the past two decades, extensive efforts have been made to study the gas sensing function of NWs. This review article presents the recent developments related to the applications of SiNWs for gas sensing. The content begins with the two basic synthesis approaches (top-down and bottom-up) whereby the advantages and disadvantages of each approach have been discussed. Afterwards, the basic sensing mechanism of SiNWs for both resistor and field effect transistor designs have been briefly described whereby the sensitivity and selectivity to gases after different functionalization methods have been further presented. In the final words, the challenges and future opportunities of SiNWs for gas sensing have been discussed.

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“…14,15 The same active sites in these metal oxides have been used for H 2 S sensing at low temperatures. 16 Thus, it can be safely assumed that these metal oxide composites could be suitable for the catalytic oxidation of H 2 S at low temperatures or even at room temperature.…”

Section: Introductionmentioning

confidence: 99%

“…Though room temperature H 2 S oxidation studies on CeO 2 or CeO 2 -based composites are scarce, several reports on H 2 S sensing over these materials are available in the literature. 16,17 Many of the transition metal oxides show excellent H 2 S adsorptive/oxidative behaviour at room temperature. 18 Furthermore, the synthesized nanocomposites were tested for the removal of H 2 S in ambient conditions.…”

Section: Introductionmentioning

confidence: 99%

A novel one-step synthesis of Ce/Mn/Fe mixed metal oxide nanocomposites for oxidative removal of hydrogen sulfide at room temperature

2021

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Gas sensors based on CeO2 nanoparticles prepared by chemical precipitation method and their temperature-dependent selectivity towards H2S and NO2 gases

Cited by 78 publications

References 56 publications

Revealing the Effect of Synthesis Conditions on the Structural, Optical, and Antibacterial Properties of Cerium Oxide Nanoparticles

Revealing the Effect of Synthesis Conditions on the Structural, Optical, and Antibacterial Properties of Cerium Oxide Nanoparticles

Silicon Nanowires for Gas Sensing: A Review

A novel one-step synthesis of Ce/Mn/Fe mixed metal oxide nanocomposites for oxidative removal of hydrogen sulfide at room temperature

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