Investigation of the key parameters for gas sensing through comparison of electrospun and sol-gel semiconducting oxides

Fioravanti, Ambra; Morandi, Sara; Pedrazzo, Alberto Rubin; Cecone, Claudio; Manzoli, Maela; Zanetti, Marco; Bracco, Pierangiola; Mazzocchi, M.; Lettieri, S.; Marani, Pietro; Carotta, M.C.

doi:10.1016/j.ceramint.2022.04.087

Cited by 12 publications

(6 citation statements)

References 83 publications

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“…As shown in Table , the preparative conditions are the same for all samples; nevertheless, outcomes are quite different. The SSAs of SnO 2 are between ∼44 and 50 m 2 /g; for all CD templates, these values are quite higher or at least comparable with those reported in the literature for SnO 2 prepared by other synthetic routes. − This result is very interesting since the samples were obtained through an objectively very simple preparation, without complex procedures and, even more noteworthily, without any solvent in any step. On the other hand, ZnO samples show much lower SSAs with respect to SnO 2 .…”

Section: Resultssupporting

confidence: 78%

“…On the other hand, ZnO samples show much lower SSAs with respect to SnO 2 . In this case, SSAs are lower or at least comparable to those reported in the literature for ZnO prepared by other synthetic routes. − Nevertheless, this result still remains interesting, taking into account that the samples, as in the other case, were obtained without complex procedures and without any solvent in any step.…”

Section: Resultssupporting

confidence: 76%

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Cyclodextrins as a Templating Agent in Solvent-Free Kneading-Based Syntheses of Nanosized SnO₂ and ZnO

Pedrazzo

Jouve

Morandi

et al. 2022

ACS Sustainable Chem. Eng.

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In recent years, in the ultrasensible sensor field, there has been a growing interest in diffusion of metal oxide-based semiconductors (MOS): they are suitable materials for sensors, combining high efficiency, fast response, stability, simple preparation, and low cost. In most applications (gas sensing, solar cells, and photocatalysis), MOS activity is strongly related to the specific surface area; to improve the properties of MOS, research is moving toward nanosized structures with controllable crystalline phases. There are many examples of synthetic methods that permit one to obtain ceramic nanoparticles, such as thermal and physical deposition, hydro/solvothermal processes, and more recently, electrospinning (ES) followed by thermal treatment. The addition of an oxide precursor to a polymeric solution and subsequent thermal treatment, above the thermal degradation of the polymer, allow one to ablate the polymeric matrix and, at the same time, to convert the precursor in the respective oxide. In this work, a new synthetic route of nanosized MOS is proposed, where the ES process, before calcination, is indeed replaced by the simple kneading of the precursors in the presence of an excess of cyclodextrins (CDs). The CD structure with the presence of a slightly apolar cavity and a hydrophilic external part determines the ability to establish specific interactions with various types of molecules through the formation of noncovalently bonded complexes, either in the solid phase or in aqueous solution. The possibility to exploit inclusion complexes of CDs and metal precursors to obtain nanostructured oxides is herein demonstrated. The inclusion complexes were prepared using zinc oxide (ZnAc) and tin(II) ethylexanoate (precursors of SnO2 and ZnO) and by exploiting a solvent-free approach based on the kneading of α-CD, β-CD, and γ-CD and precursors in a ball mill. The use of kneading overcomes all the limitations related to poorly soluble or insoluble compounds, permitting one to avoid the use of solvents and to speed up the preparation of the MOS precursor. The complexes after kneading were characterized by thermogravimetric analyses and then thermally treated to obtain oxides. After the synthesis, the so-obtained SnO2 and ZnO nanoparticles were characterized by high-resolution transmission electron microscopy and X-ray diffraction and by measuring the specific surface area by the Brunauer–Emmett–Teller method, putting in evidence of an influence of the CD size on the final oxide.

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Section: Resultssupporting

confidence: 78%

Section: Resultssupporting

confidence: 76%

Cyclodextrins as a Templating Agent in Solvent-Free Kneading-Based Syntheses of Nanosized SnO₂ and ZnO

Pedrazzo

Jouve

Morandi

et al. 2022

ACS Sustainable Chem. Eng.

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“…2 FeO 3 [111] 1 ppm-200 • C 32.97% ***** Fe 2 O 3 [104] 1 ppm-350 • C 3 ** 0.25CuO-0.75Fe 2 O 3 [104] 1 ppm-350 • C 10.6 ** 0. 5CuO-0.5Fe 2 O 3 [104] 1 ppm-350 • C 15.3 ** 0.75CuO-0.25Fe 2 O 3 [104] 1 ppm-350 [102] 5 ppm-260 • C 0.44 * ZnO [115] 100 ppm-RT 11.78% NA GO/ZnO [115] 100 ppm-RT 31.17% NA Co 3 O 4 [116] 20 ppm-225 • C 0.04 * 0.2 GO-Co 3 O 4 [116] 20 ppm-225 • C 9.26 * Cu/G-doped ZnO [117] 50 ppm-270 • C 3.21 ** ZnO [118] 10 ppm-450 • C 25 * SnO 2 [118] 10 ppm-350 • C <20 * TiO 2 [118] 10 ppm-350 • C <30 * Fe-doped rGO decorated WO 3 [119] 10 ppm-130 • C 4.678 ** LaFeO 3 [120] 100 ppm-100 • C 132.1 * LaFeO 3 /La 2 O 3 [120] 100 ppm-100 • C 25.7 * LaFeO 3 /Fe 2 O 3 [120] 100 ppm-100 [118] 50 ppm-450 • C <7 * TiO 2 [118] 50 ppm-450 • C <4 * CuFe 2 O 4 [102] 5 ppm-260 • C 1.22 * SnO 2 [122] 470 ppm-450 [124] NA-30 • C 78.57% ***** Sb(1.8at%)-doped SnO 2 [124] NA-80 • C 18.74% ***** Sb(2.4at%)-doped SnO 2 [124] NA-80 • C 71% ***** Ni(10 mol.%)ZnO [125] 40 ppm-RT 33.3% ***** Ni(20 mol.%)ZnO [125] 40 ppm-RT 61.1% ***** Ni(30 mol.%)ZnO [125] 40 ppm-RT 16.6% ***** LaFeO 3 [126] 5000 ppm-220 • C 1.72% ***** LaCo 0 . 1 Fe 0 .…”

Section: • Compositesmentioning

confidence: 99%

Recent Advances in Low-Dimensional Metal Oxides via Sol-Gel Method for Gas Detection

Ben Arbia,

Helal,

Comini

2024

Nanomaterials

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Low-dimensional metal oxides have drawn significant attention across various scientific domains due to their multifaceted applications, particularly in the field of environment monitoring. Their popularity is attributed to a constellation of unique properties, including their high surface area, robust chemical stability, and remarkable electrical conductivity, among others, which allow them to be a good candidate for detecting CO, CO2, H2, NH3, NO2, CH4, H2S, and volatile organic compound gases. In recent years, the Sol-Gel method has emerged as a powerful and versatile technique for the controlled synthesis of low-dimensional metal oxide materials with diverse morphologies tailored for gas sensing applications. This review delves into the manifold facets of the Sol-Gel processing of metal oxides and reports their derived morphologies and remarkable gas-sensing properties. We comprehensively examine the synthesis conditions and critical parameters governing the formation of distinct morphologies, including nanoparticles, nanowires, nanorods, and hierarchical nanostructures. Furthermore, we provide insights into the fundamental principles underpinning the gas-sensing mechanisms of these materials. Notably, we assess the influence of morphology on gas-sensing performance, highlighting the pivotal role it plays in achieving exceptional sensitivity, selectivity, and response kinetics. Additionally, we highlight the impact of doping and composite formation on improving the sensitivity of pure metal oxides and reducing their operation temperature. A discussion of recent advances and emerging trends in the field is also presented, shedding light on the potential of Sol-Gel-derived nanostructures to revolutionize the landscape of gas sensing technologies.

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“…Moreover, the organisation and positioning of nanostructures may provide difficulties (Krishna, 2022). Researchers have successfully utilised various methods, including the hydrothermal technique Catto, 2023), sol-gel chemistry (Sztaberek, 2019;, electrospinning (Fioravanti, 2022;Chen, 2022) and Vapor phase deposition (chemical, physical) (Galstyan, 2022), to grow MOXs nanowires for gas-sensing applications. These methods are preferred due to their simplicity, cost-effectiveness, and ability to produce consistent results.…”

Section: Growth Techniques Of One-dimensional Nanostructuresmentioning

confidence: 99%

One-Dimensional Metal Oxide Nanostructures: H<sub>2</sub> Gas Sensors

Kumarage,

Wijesundera

2023

sljo-j-jdrra

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This article thoroughly analyses metal oxide nanostructures with one-dimensional properties and their utilisation in hydrogen (H2) gas detection. In recent years, there has been an increasing interest in utilising the distinct characteristics of Metal Oxides (MOXs) Nanowires (NWs), Nanorods (NRs), and Nanotubes (NTs) to create advanced H2 gas sensors with exceptional performance. The article examines the ways of synthesising these nanostructures, focusing on hydrothermal, solvothermal, and electrospinning processes due to their cost-effectiveness and ability to produce high yields. This article discusses the operation of hydrogen (H2) gas sensors that utilize one-dimensional metal oxide frameworks that can perform effectively at both room temperature and low temperatures. Moreover, the research highlights the need to examine adjustable growth factors to enhance the efficiency of these nanostructures. Furthermore, this study comprehensively investigates the effects of decoration, functionalization, and doping techniques on boosting the chemical and physical characteristics of Metal Oxides (MOXs) that are useful in gas sensing functionality. The study proposes the necessity for future research to investigate the operational processes of metal oxide nanostructures, specifically in the setting of hybrid nanocomposites. Thorough investigations like this are essential for evaluating the effects of certain materials on the structure and form of the hybrid system. This review aims to offer substantial insights that will enhance the advancement of high-performance sensor devices tailored for the detection of hydrogen gas. Additionally, the review incorporates a perspective that illuminates the expected future research trends in the field.

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Investigation of the key parameters for gas sensing through comparison of electrospun and sol-gel semiconducting oxides

Cited by 12 publications

References 83 publications

Cyclodextrins as a Templating Agent in Solvent-Free Kneading-Based Syntheses of Nanosized SnO₂ and ZnO

Cyclodextrins as a Templating Agent in Solvent-Free Kneading-Based Syntheses of Nanosized SnO₂ and ZnO

Recent Advances in Low-Dimensional Metal Oxides via Sol-Gel Method for Gas Detection

One-Dimensional Metal Oxide Nanostructures: H<sub>2</sub> Gas Sensors

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Investigation of the key parameters for gas sensing through comparison of electrospun and sol-gel semiconducting oxides

Cited by 12 publications

References 83 publications

Cyclodextrins as a Templating Agent in Solvent-Free Kneading-Based Syntheses of Nanosized SnO2 and ZnO

Cyclodextrins as a Templating Agent in Solvent-Free Kneading-Based Syntheses of Nanosized SnO2 and ZnO

Recent Advances in Low-Dimensional Metal Oxides via Sol-Gel Method for Gas Detection

One-Dimensional Metal Oxide Nanostructures: H<sub>2</sub> Gas Sensors

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Product

Resources

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Cyclodextrins as a Templating Agent in Solvent-Free Kneading-Based Syntheses of Nanosized SnO₂ and ZnO

Cyclodextrins as a Templating Agent in Solvent-Free Kneading-Based Syntheses of Nanosized SnO₂ and ZnO