Stabilization of Monodisperse, Phase-Pure MgFe2O4 Nanoparticles in Aqueous and Nonaqueous Media and Their Photocatalytic Behavior

Kirchberg, Kristin; Becker, Anna; Bloesser, André; Weller, Tobias; Timm, Jana; Suchomski, Christian; Marschall, Roland

doi:10.1021/acs.jpcc.7b08780

Cited by 48 publications

(64 citation statements)

References 88 publications

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“…The optical energy for TiFe 2 O 4 and ZnFe 2 O 4 changes slightly between 2.17 eV and 2.27 eV for 1064 nm and 532 nm and it does not present significant changes after one month of the synthesis which gives indications about the stability of the colloid over the time as can be seen in the method used, Figure 3a,b. These values are in accordance with those reported in previous works showing magnetic semiconductor behavior [40][41][42][43]. These results have a great variety of photocatalyst applications in environmental cleaning, since a small band gap is also important in any applications of NPs that involve light, as has been reported in previous works [14,34].…”

Section: Band Gap Estimationsupporting

confidence: 92%

Colloidal Metal Oxide Nanoparticles Prepared by Laser Ablation Technique and Their Antibacterial Test

Duque

Madrigal

Riascos

et al. 2019

Colloids and Interfaces

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In this article we report the production of metal oxide (TiFe2O4, ZnFe2O4) nanoparticles by pulsed laser ablation technique in a liquid environment. We used nanosecond Nd: YAG laser systems working at 532 nm and 1064 nm of wavelength and the energy of the laser beam was kept constant at 80 mJ. Absorbance spectra, surface plasmon resonance, optical band-gap, and nanoparticle morphology were investigated using ultraviolet-visible (UV-Vis) spectroscopy, Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM). Changing the wavelength of the laser for growth, nanoparticles showed shift between the absorbance and surface plasmon resonance peaks in their UV-Vis spectra, which implies that the optical properties of the colloid nanoparticles depend on laser parameters. This was confirmed with the variation of the band gap energy. Furthermore, redshift for the absorbance peak was observed for samples as-grown at 532 nm around 150 nm as a function of time preparation. Conversely, for the samples as-grown at 1064 nm there was no shift in the absorbance spectra, which could be due to agglomeration and formation of larger particles. The characterization results showed appropriate plasmonic photo-catalysts properties of the particles, hence the photoactivation of the nanoparticles was examined on antibacterial effect using colonies of Staphylococcus aureus and Escherichia coli.

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Section: Band Gap Estimationsupporting

confidence: 92%

Colloidal Metal Oxide Nanoparticles Prepared by Laser Ablation Technique and Their Antibacterial Test

Duque

Madrigal

Riascos

et al. 2019

Colloids and Interfaces

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“…For synthesis of MgFe 2 O 4 nanoparticles a known microwave synthesis method was modified here [51]. 194.7 mg (0.875 mmol) of magnesium acetylacetonate were dissolved in 15 mL rac-1-phenylethanol using an ultrasonic bath.…”

Section: Synthesismentioning

confidence: 99%

“…The stabilization of ferrite NPs in dispersion is possible after or during synthesis [31,35,40,41]. A lot of synthesis strategies for ferrite NPs and the further preparation of stable ferrite NP dispersions are known like sol-gel [42,43] or solvothermal [44][45][46], high temperature [47,48], mechanochemical routes [49], or microwave-assisted procedures [50,51]. Recently, we could show that stable MgFe 2 O 4 NP dispersions could be achieved by employment of appropriate capping agents in aqueous and also non-aqueous solvents [51].…”

Section: Introductionmentioning

confidence: 99%

Stabilization of nanosized MgFe2O4 nanoparticles in phenylene-bridged KIT-6-type ordered mesoporous organosilica (PMO)

Timm

Bloesser

Zhang

et al. 2020

Microporous and Mesoporous Materials

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The unique combination of two functional materials, namely the earth-abundant spinel magnesioferrite (MgFe 2 O 4) and mesoporous phenylene-bridged KIT-6-type organosilica, was developed. The mesoporous organosilica acts as host matrix for the nanosized MgFe 2 O 4 particles which leads to better dispersibility and increased stability towards acids. Additionally, the mesoporous host is a very good material to generate a toolbox towards applicable materials due to flexible functionalization. Nanosized, monodisperse MgFe 2 O 4 crystallites were synthesized via a facile microwave assisted non-aqueous reaction path. Afterwards, the particles were embedded in phenylene-bridged periodic mesoporous organosilica with 3D cubic pore arrangement (KIT-6-type PMO) generating a new kind of mesoporous inorganic-organic hybrid material (MgFe 2 O 4 @phe-PMO). The MgFe 2 O 4 @phe-PMO exhibits the characteristics of both components: A high specific surface area of 1164 m 2 g-1 with clearly defined and highly ordered micro-and mesopores (1.5 and 6.8 nm), and the broad absorption of visible and UV light due to the phenylene bridging units in the PMO and the MgFe 2 O 4 particles. The presence of MgFe 2 O 4 nanoparticles in the PMO matrix is proven by UV/Vis spectroscopy, powder X-ray diffraction (PXRD) and transmission electron microscopy (TEM). Selected area electron diffraction (SAED) and Scanning TEM in atomic resolution was chosen to demonstrate the crystallinity and phase purity of MgFe 2 O 4 particles in the hybrid material. An additional focus was laid on calcination of the MgFe 2 O 4 /PMO hybrids to remove template molecules, while preventing rearrangement or shrinkage of the pore system and to promote further crystallization of the MgFe 2 O 4 nanoparticles.

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“…These special characteristics are caused by the effects of quantum confinement effect of metallic nanoclusters of TiFe2O4 and ZnFe2O4, which cannot be seen in bulk material [25,36,37]. [40,41]. This results have a great variety photocatalysts applications in environmental clean since a small band gap is also important as is reported in previous works [14,34].…”

Section: Uv-vis Analysismentioning

confidence: 82%

Colloidal Metal Oxide Nanoparticles Prepared by Laser Ablation Technique and Their Antibacterial Test

Duque¹,

Moreno²,

Avila³

et al. 2019

Preprint

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We report the production of metal oxide (TiFe2O4, ZnFe2O4) nanoparticles by pulsed laser ablation technique in liquid environment. We used nano second Nd: YAG   laser systems working at 532 nm and 1064 nm of wavelength, the energy of the laser beam was kept constant at 80 mJ. Absorbance spectra, surface plasmon resonance, optical band-gap and nanoparticle morphology were investigated using ultraviolet-visible (UV-Vis) spectroscopy, Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM). Changing the wavelength of the laser for growth, nanoparticles shown shift between the absorbance and surface plasmon resonance peaks in their UV-Vis spectra, this implies that the optical properties of the colloid nanoparticles depends on laser parameters, this was confirmed with the variation of the band gap energy. Furthermore, red shift for the absorbance peak was observed for samples as-growth at 532 nm around the 150 nm as function of time preparation. Whereas, for the samples as-growth at 1064 nm there is no shift in the absorbance spectra, this can be due to agglomeration and formation of larger particles. The characterization results shown appropriate plasmonic photo-catalysts properties of the particles, hence the photo activation of the nanoparticles was examined on antibacterial effect using colonies of Staphylococcus Aureus and Escherichia coli.

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Stabilization of Monodisperse, Phase-Pure MgFe₂O₄ Nanoparticles in Aqueous and Nonaqueous Media and Their Photocatalytic Behavior

Cited by 48 publications

References 88 publications

Colloidal Metal Oxide Nanoparticles Prepared by Laser Ablation Technique and Their Antibacterial Test

Colloidal Metal Oxide Nanoparticles Prepared by Laser Ablation Technique and Their Antibacterial Test

Stabilization of nanosized MgFe2O4 nanoparticles in phenylene-bridged KIT-6-type ordered mesoporous organosilica (PMO)

Colloidal Metal Oxide<sub> </sub>Nanoparticles Prepared by Laser Ablation Technique and Their Antibacterial Test

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