Novel route for fabrication of nanostructured α-Fe2O3 gas sensor

Bandgar, D.K.; Navale, S.T.; Khuspe, G.D.; Pawar, Sachin A.; Mulik, R. N.; Patil, V. B.

doi:10.1016/j.mssp.2013.08.016

Cited by 61 publications

(25 citation statements)

References 23 publications

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“…Thanks to its low cost, high resistance to corrosion, and nontoxicity properties, this most stable iron oxide has been traditionally used as catalysts, pigments, electrode materials and gas sensor [7,8,9]. Regarding gas sensor applications, there are many reports about α-Fe 2 O 3 nanostructures [10,11] and many researchers have tried to enhance gas sensing properties of iron oxide using different strategies such as doping with metals [12], composite with another metal oxide [13] and synthesis of different morphologies [11]. Ag as a core is the cheapest available noble metal and displays excellent thermal conductivity properties, and its electrical conductivity is the best amongst other excellent candidate metals like Cu, Al and Au [14].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Characterization and Gas Sensing Properties of Ag@α-Fe2O3 Core–Shell Nanocomposites

et al. 2015

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Ag@α-Fe2O3 nanocomposite having a core–shell structure was synthesized by a two-step reduction-sol gel approach, including Ag nanoparticles synthesis by sodium borohydride as the reducing agent in a first step and the subsequent mixing with a Fe+3 sol for α-Fe2O3 coating. The synthesized Ag@α-Fe2O3 nanocomposite has been characterized by various techniques, such as SEM, TEM and UV-Vis spectroscopy. The electrical and gas sensing properties of the synthesized composite towards low concentrations of ethanol have been evaluated. The Ag@α-Fe2O3 nanocomposite showed better sensing characteristics than the pure α-Fe2O3. The peculiar hierarchical nano-architecture and the chemical and electronic sensitization effect of Ag nanoparticles in Ag@α-Fe2O3 sensors were postulated to play a key role in modulating gas-sensing properties in comparison to pristine α-Fe2O3 sensors.

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Section: Introductionmentioning

confidence: 99%

Synthesis, Characterization and Gas Sensing Properties of Ag@α-Fe2O3 Core–Shell Nanocomposites

et al. 2015

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“…Because of these excellent properties, α-Fe2O3 nanoparticles are used in water treatment [9], contrast reagents/drug delivery [10], sensor technology [11], [12], optical coatings, magnetic storage [13], field-effect transistors [14], catalysts [15], pigments [16], etc. α-Fe2O3 nanoparticles can be synthesized by several methods, for instance, chemical vapour deposition, hydrothermal synthesis [17], sonochemical technique, chemical precipitation [18], sol-gel technique [19], microemulsion technique [20], hydrolysis [21], ball milling [22], laser ablation, sputtering, and spray pyrolysis [23]. In the past decades until now, there have been numerous investigations of different magnetic nanoparticle-based polymer nanocomposites [24]- [30].…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Characterization of α-Fe2O3 Nanoparticles Dispersed Epoxy Nanocomposites

et al. 2021

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Hematite(α-Fe2O3) nanoparticles were synthesized by sol-gel process and further mixed with epoxy resin to obtain the nanocomposites. X-Ray Diffraction (XRD) and Scanning Electron Microscope (SEM) analysis revealed that α-Fe2O3 nanoparticles have an average diameter of about 30 nm, also illustrated the crystal structure and morphology of the nanomaterials. Fourier-Transform Infrared spectroscopy (FTIR) showed the functional groups that were present in α-Fe2O3 nanoparticles, neat epoxy andα-Fe2O3/epoxy nanocomposites. Vibrating Sample Magnetometer (VSM) analysis exhibits the magnetic hysteresis curve and revealed that α-Fe2O3 nanoparticles were superparamagnetic. Tensile testing was performed to obtain the tensile strength, yield strength, elongation, young modulus and required energy to deform the materials. Vickers micro-hardness test showed the surface hardness of the nanocomposites. Flexural strength also measured, which indicate the strength of nanocomposites against bending. Thermogravimetric Analysis (TGA) measurement showed the thermal properties of α-Fe2O3 nanoparticles and its influence into the epoxy matrix. UV-Vis spectroscopy was performed to obtain the optical band gap energy of the nanocomposites. DC-resistivity measurements showed a significant influence of α-Fe2O3 nanoparticles on the dc-electrical properties of the epoxy matrix.

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“…Different methods of synthesis of nanostructured metal oxides have been described in the literature, such as sol-gel, hydrolysis, thermal decomposition, sonochemistry, microwave, hydrothermal [3][4][5]. Various methods for synthesizing nanostructured metal oxides use various experimental parameters such as pH of the synthesis solution, surfactant, reaction temperature, precursor concentrations and pressure to control the morphology and size of the nanostructure, almost all methods [6].…”

Section: Introductionmentioning

confidence: 99%

Nanostructured Iron Oxide Powders by Microwave Assisted Synthesis

Modan¹,

Ducu

Topala

et al. 2021

J. Sci. Arts

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A range of nanostructured oxides with excellent properties is used in technology and science for applications in several fields: catalysis, gas detection, biomedical applications. The most studied forms of oxides are hematite, maghemite and magnetite. In this study, microwave-assisted hydrolytic synthesis and microwave-assisted coprecipitation synthesis are described for the preparation of undoped and doped iron oxide powders using iron (III) chloride (FeCl3), potassium chloride (KCl) as precursors and sodium hydroxide (NaOH) solution as a hydrolysis agent. Microwave-assisted hydrolysis was performed at different concentrations of FeCl3 precursor: 0.1 M, 0.4 M, 0.7 M to which a constant concentration of hydrolysis agent was added, and the synthesis to obtain potassium-doped powders consisted of co-precipitation of 0.1M FeCl3 and 0.025M KCl precursor solutions in the presence of 2M NaOH hydrolysis agent. The developed powders were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and Fourier transform infrared spectroscopy (FTIR). The novelty is the use of potassium as a doping element for iron oxide, for potential application as catalyst. Hematite doped with 5% K was obtained by microwave-assisted coprecipitation synthesis. The presence of K was evidenced by EDS, while XRD spectra indicate successful doping of iron oxide with potassium, either interstitially or by substitution. By microwave synthesis, an increase in particle size was observed with increasing calcination temperature. The formation of the crystalline hematite phase was not obtained in the microwave heating process but following calcination of the powder

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Novel route for fabrication of nanostructured α-Fe2O3 gas sensor

Cited by 61 publications

References 23 publications

Synthesis, Characterization and Gas Sensing Properties of Ag@α-Fe2O3 Core–Shell Nanocomposites

Synthesis, Characterization and Gas Sensing Properties of Ag@α-Fe2O3 Core–Shell Nanocomposites

Fabrication and Characterization of α-Fe2O3 Nanoparticles Dispersed Epoxy Nanocomposites

Nanostructured Iron Oxide Powders by Microwave Assisted Synthesis

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