Mesoporous Silica Matrix as a Tool for Minimizing Dipolar Interactions in NiFe2O4 and ZnFe2O4 Nanoparticles

Virumbrales, M.; Sáez-Puche, R.; Torralvo, M.J.; Blanco-Gutiérrez, V.

doi:10.3390/nano7070151

Cited by 10 publications

(8 citation statements)

References 45 publications

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“…), which are materials that include two types of transition metals, have stood out due to their robust catalytic activity as exhibiting significant potential applications in various fields. In particular, a few of them such as ZnFe 2 O 4 [13,14], NiFe 2 O 4 [15,16,17,18,19,20,21,22], CoFe 2 O 4 [23], MnFe 2 O 4 [24], Ni 1-X Co X Fe 2 O 4 [25], and NiCuZn ferrites [26] have been reported to be greatly promising in the electrical properties of gas sensors and humidity sensors. More interesting, NiFe 2 O 4 with various microstructures have been prepared so far to effectively detect acetone [14,15,16,17], ammonia [18], NO 2 [19], n-propanol [20], and triethylamine [21].…”

Section: Introductionmentioning

confidence: 99%

“…In addition, the NiFe bimetallic MOFs have been synthesized by metal Ni incorporation, which is further converted to ternary oxides of NiFe 2 O 4 . Song et al obtained hollow NiFe 2 O 4 microspindles from NiFe bimetallic MOFs, illustrating a high sensitivity for acetone detection [14]. Zhang et al prepared 1D α-Fe 2 O 3 /NiFe 2 O 4 heterojunction, which showed an improved response to acetone vapors using NiFe-bimetallic MOFs [39].…”

Section: Introductionmentioning

confidence: 99%

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MOFs-Derived Porous NiFe2O4 Nano-Octahedrons with Hollow Interiors for an Excellent Toluene Gas Sensor

et al. 2019

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Toluene is extensively used in many industrial products, which needs to be effectively detected by sensitive gas sensors even at low-ppm-level concentrations. Here, NiFe2O4 nano-octahedrons were calcinated from NiFe-bimetallic metal-organic framework (MOFs) octahedrons synthesized by a facile refluxing method. The co-existence of p-Phthalic acid (PTA) and 3,3-diaminobenzidine (DAB) promotes the formation of smooth NiFe-bimetallic MOFs octahedrons. After subsequent thermal treatment, a big weight loss (about 85%) transformed NiFe2O4 nanoparticles (30 nm) into NiFe2O4 porous nano-octahedrons with hollow interiors. The NiFe2O4 nano-octahedron based sensor exhibited excellent gas sensing properties for toluene with a nice stability, fast response, and recovery time (25 s/40 s to 100 ppm toluene), and a lower detection limitation (1 ppm) at 260 °C. The excellent toluene-sensing properties can not only be derived from the hollow interiors combined with porous nano-octahedrons to favor the diffusion of gas molecules, but also from the efficient catalytic activity of NiFe2O4 nanoparticles.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

MOFs-Derived Porous NiFe2O4 Nano-Octahedrons with Hollow Interiors for an Excellent Toluene Gas Sensor

et al. 2019

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“…On the other hand, using HCA as a coating ligand instead of TEG leads to a dispersion of nanoparticles inside the ordered silica structure. The CFO HS nanocomposite shows a decrease in the M r / M s value, indicating a reduction in the interparticle interactions among particles . Moreover, the reduction of coercivity indicates that the system becomes less anisotropic.…”

Section: Resultsmentioning

confidence: 98%

Morpho-Structural and Magnetic Properties of CoFe₂O₄/SiO₂ Nanocomposites: The Effect of the Molecular Coating

et al. 2023

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The use of magnetic nanoarchitecture in several applications is often limited by the lack of noninteracting particles, due to the frequent presence of clusters and aggregates of particles. Here, we report an investigation of the interparticle interactions by changing the molecular coating on ∼5 nm CoFe 2 O 4 nanoparticles embedded in a silica structure. The magnetic investigation at a low temperature allows revealing the key role of organic ligands in tuning the morpho-structural properties of hybrid materials. Cobalt ferrite-coated nanoparticles were prepared by the polyol method using triethylene glycol as a co-reagent (CFO T ) and by the exchange ligand process using dihydroxyhydrocinnamic acid (CFO H ). Then, magnetic mesoporous silica nanocomposites have been prepared starting from CFO T (CFO TS ) and CFO H (CFO HS ). For the CFO TS sample, the interparticle distance did not change after coating, whereas the CFO HS sample showed an increase in the interparticle distance by 23%. This value has been obtained by investigating interparticle interactions by remanence techniques, which represent a good approach to determine the approximated values of interparticle distances in complex systems. The measurements showed that the silica coating produces a reduction of 47% in the dipolar interaction strength for the CFO HS sample, whereas no significant change was observed for the CFO TS sample. The differences in magnetic response upon varying the molecular coating of nanoparticles are due to the different interactions of the molecular ligands with silica, resulting in a change of interparticle distances and then magnetic interactions.

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“…However, these materials possess certain drawbacks including low catalytic activity, low electronic conductivity, restricted sensitivity, and selectivity. In recent years, some bimetal oxides, such as ZnFe 2 O 4 , , NiFe 2 O 4 , − CoFe 2 O 4 , and MnFe 2 O 4 , have become gas sensing materials because of their defect effects and excellent catalytic activity. As a particular cubic spinel material, various microstructures of NiFe 2 O 4 have been prepared to efficiently detect acetone, , ammonia, n -propanol, toluene, , NO 2 , etc.…”

Section: Introductionmentioning

confidence: 99%

Metal–Organic Framework-Derived Porous NiFe₂O₄ Nanoboxes for Ethyl Acetate Gas Sensors

Liu

Wang

Zhang

et al. 2022

ACS Appl. Nano Mater.

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Detection of ethyl acetate (EtOAc) gas is important for human health and even the diagnosis of certain cancers. However, only a few materials were reported for EtOAc sensing. Herein, NiFe2O4 nanobox (NB) sensing materials with a porous hollow structure were prepared by annealing the self-sacrificed templates of hydrothermally synthesized metal–organic frameworks (MOFs). The superior selectivity of NiFe2O4 NB materials was observed toward EtOAc gas at low optimum working temperature. The response (R g /R a) of the NiFe2O4 NB-based sensor is 64.27 toward 200 ppm EtOAc at 120 °C, which is nearly three times greater than that of the sensor based on NiFe2O4 nanocubes (NCs) without a hollow structure. In addition, the NiFe2O4 NB-based sensor exhibited a limit of detection (LOD) of around 0.26 ppm. The enhanced gas sensing performance of the NiFe2O4 NB material may be associated with the unique porous hollow morphology and multiple surface element states, providing more active sites and facilitating the diffusion of gases. The NiFe2O4 NB material is expected to be a candidate material for EtOAc gas detection.

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Mesoporous Silica Matrix as a Tool for Minimizing Dipolar Interactions in NiFe2O4 and ZnFe2O4 Nanoparticles

Cited by 10 publications

References 45 publications

MOFs-Derived Porous NiFe2O4 Nano-Octahedrons with Hollow Interiors for an Excellent Toluene Gas Sensor

MOFs-Derived Porous NiFe2O4 Nano-Octahedrons with Hollow Interiors for an Excellent Toluene Gas Sensor

Morpho-Structural and Magnetic Properties of CoFe₂O₄/SiO₂ Nanocomposites: The Effect of the Molecular Coating

Metal–Organic Framework-Derived Porous NiFe₂O₄ Nanoboxes for Ethyl Acetate Gas Sensors

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Mesoporous Silica Matrix as a Tool for Minimizing Dipolar Interactions in NiFe2O4 and ZnFe2O4 Nanoparticles

Cited by 10 publications

References 45 publications

MOFs-Derived Porous NiFe2O4 Nano-Octahedrons with Hollow Interiors for an Excellent Toluene Gas Sensor

MOFs-Derived Porous NiFe2O4 Nano-Octahedrons with Hollow Interiors for an Excellent Toluene Gas Sensor

Morpho-Structural and Magnetic Properties of CoFe2O4/SiO2 Nanocomposites: The Effect of the Molecular Coating

Metal–Organic Framework-Derived Porous NiFe2O4 Nanoboxes for Ethyl Acetate Gas Sensors

Contact Info

Product

Resources

About

Morpho-Structural and Magnetic Properties of CoFe₂O₄/SiO₂ Nanocomposites: The Effect of the Molecular Coating

Metal–Organic Framework-Derived Porous NiFe₂O₄ Nanoboxes for Ethyl Acetate Gas Sensors