Characterization of mechano-thermally synthesized Curie temperature-adjusted La0.8Sr0.2MnO3 nanoparticles coated with (3-aminopropyl) triethoxysilane

Salili, Seyyed Muhammad; Ataie, A.; Barati, Mohammad Reza; Sadighi, Zoya

doi:10.1016/j.matchar.2015.05.025

Cited by 22 publications

(11 citation statements)

References 34 publications

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“…In addition, a N−H band is observed for APTES at about 1630 cm −1 . At lower wavenumbers, the bands in the 1100–1000 cm −1 region are related to additional Si‐O‐Si and Si‐O‐C bands . The description of the FTIR spectra for the NiFe‐DS and NiFe‐AQ samples can be found in previously published work, in which their main vibrational bands are reported .…”

Section: Resultssupporting

confidence: 57%

Fundamental Insights into the Covalent Silane Functionalization of NiFe Layered Double Hydroxides

Carrasco

Silva

Oestreicher

et al. 2020

Chemistry A European J

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Layered double hydroxides (LDHs) are ac lass of 2D anionic materials exhibiting wide chemical versatility and promising applications in different fields, ranging from catalysis to energy storage and conversion.H owever,t he covalent chemistry of this kind of 2D materials is still barely explored. Herein, the covalentf unctionalization with silanes of am agnetic NiFe-LDH is reported. The synthetic route consists of at opochemical approach followed by anion exchange reaction with surfactant molecules prior to covalent functionalization with the (3-aminopropyl)triethoxysilane (APTES) molecules. The functionalized NiFe-APTES was fully characterized by X-ray diffraction, infrared spectroscopy, electron microscopy,t hermogravimetric analysis coupled with mass spectrometry and 29 Si solid-state nuclear magnetic resonance, among others. The effect on the electronic properties of the functionalizedL DH was investigated by am agnetic study in combination with Mçssbauer spectroscopy. Moreover,t he reversibility of the silane-functionalizationa t basic pH was demonstrated, and the quality of the resulting LDH was proven by studying the electrochemical performance in the oxygen evolution reaction in basic media. Furthermore, the anion exchange capability for the NiFe-APTES was tested employing Cr VI ,r esulting in an increase of 200 %o ft he anion retention. This report allows for an ew degree of tunability of LDHs, openingt he door to the synthesis of new hybrid architectures and materials.[a] Dr.Figure 2. FESEM (A), TEM (B) and mapping images (bottom panel) of NiFe-APTES. The inset in (A) shows DLS and the inset in (B) showst he SAED pattern. Mapping imagesare obtained from the single particle in the bottom left image( scale bar of 100 nm).

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Section: Resultssupporting

confidence: 57%

Fundamental Insights into the Covalent Silane Functionalization of NiFe Layered Double Hydroxides

Carrasco

Silva

Oestreicher

et al. 2020

Chemistry A European J

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“…Various geometries are evenly distributed on surface as has been proposed in similar perovskite ceramics with a varying chemical stoichiometry. 27 At higher magnication, we observe that all particles with a regular size of nearly 5 mm are evenly scattered on the surface, indicating that each particle consists of an agglomerate of a variety of crystallites. 28 To compare doping elements, we remark that the BCPrTZN compounds have a smaller grain sizes than the BCCrTZN compound.…”

Section: Surface Morphological and Composition Analysismentioning

confidence: 74%

“…Various geometries are evenly distributed on surface as has been proposed in similar perovskite ceramics with a varying chemical stoichiometry. 27 …”

Section: Resultsmentioning

confidence: 99%

Evaluation of the microstructure, optical properties and hopping conduction mechanism of rare earth doped Ba_0.85Ca_0.12RE_0.03Ti_0.90Zr_0.04Nb_0.042O₃ ceramics (RE = Ce³⁺ and Pr³⁺)

et al. 2022

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“…In addition, surface functionalization of the QDs was probed by the Fourier transform infrared (FTIR) spectral studies (spectrum shown in Figure d), which corroborated the XPS results. For instance, bands observed at 1010 and 1100 cm –1 correspond to Si–O–Si and Si–O–C vibrations, respectively. , Likewise, the vibrational frequency bands at ∼687 and 918 cm –1 could be attributed to Si–O–Si and Si–O–H bonds, , whereas the bands at ∼756 and 1460 cm –1 could be assigned to the Si–C bonds. − The infrared bands located at 1325 and 1560 cm –1 are related to the C–N and N–H bonds, respectively. , The asymmetric stretching of the C–CH 2 groups could be observed at ∼2925 cm –1 . ,, It is evident from these characterization studies that a-Si QDs embedded by the shell of silicon oxides have been formed by the current γ-ray irradiation approach.…”

Section: Resultsmentioning

confidence: 99%

“…For instance, bands observed at 1010 and 1100 cm −1 correspond to Si−O−Si and Si−O−C vibrations, respectively. 70,71 Likewise, the vibrational frequency bands at ∼687 and 918 cm −1 could be attributed to Si−O−Si and Si−O−H bonds, 72,73 whereas the bands at ∼756 and 1460 cm −1 could be assigned to the Si−C bonds. 74−76 The infrared bands located at 1325 and 1560 cm −1 are related to the C−N and N−H bonds, respectively.…”

Section: Resultsmentioning

confidence: 99%

Blue Light-Emitting Si Quantum Dots with Mesoporous and Amorphous Features: Origin of Photoluminescence and Potential Applications

2017

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Recently, Si quantum dots (QDs) with porous and amorphous characteristics have shown tremendous potential applications in photovoltaics and biomedical fields. However, in general, their preparation involves meticulous synthetic procedures. Herein, we present the first report of the synthesis of Si QDs in aqueous solution with amorphous and porous features using γ-ray irradiation, which is a facile, one-pot, and reproducible approach. Fourier transform infrared and X-ray photoelectron spectroscopy indicated the formation of a shell of Si oxides (SiO x , 0 < x < 2) surrounding the Si core. The Brunauer–Emmett–Teller method confirmed the formation of mesoporous structure with a specific surface area of ∼53 m2/g. The average size of the QDs was <2 nm, as determined from high-resolution transmission electron microscopy. Moreover, the size of the QDs could be tuned by varying the dose, as was indicated from the shift in their absorption peaks. The QDs displayed bright blue emission under ultraviolet light. Detailed and systematic investigations involving various sets of experiments such as aging, annealing, acid treatment, and temperature-dependent PL studies of the QDs indicate the origin of the blue photoluminescence (PL) is the radiative processes originating from the defects located in the oxide shell as well as at/or near the Si/SiO x interface. This has been further substantiated from the size-independent emission spectra at various absorbed doses and short PL lifetime (in nanoseconds). Nonetheless, these QDs showed highly sensitive and robust thermosensing properties, as their PL intensity varied linearly and reproducibly with temperature, ranging from 278 to 338 K. In addition, the QDs were found to be noncytotoxic and therefore can be utilized in cell imaging. Furthermore, the blue PL and the nontoxic aspects of these QDs can be utilized in anticounterfeiting measures, the potential application of which is also demonstrated in this work. The possible mechanism behind the formation of Si QDs and the role of the total dose in the introduction of mesoporous and amorphous features are proposed and explained in this paper.

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Characterization of mechano-thermally synthesized Curie temperature-adjusted La0.8Sr0.2MnO3 nanoparticles coated with (3-aminopropyl) triethoxysilane

Cited by 22 publications

References 34 publications

Fundamental Insights into the Covalent Silane Functionalization of NiFe Layered Double Hydroxides

Fundamental Insights into the Covalent Silane Functionalization of NiFe Layered Double Hydroxides

Evaluation of the microstructure, optical properties and hopping conduction mechanism of rare earth doped Ba_0.85Ca_0.12RE_0.03Ti_0.90Zr_0.04Nb_0.042O₃ ceramics (RE = Ce³⁺ and Pr³⁺)

Blue Light-Emitting Si Quantum Dots with Mesoporous and Amorphous Features: Origin of Photoluminescence and Potential Applications

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Characterization of mechano-thermally synthesized Curie temperature-adjusted La0.8Sr0.2MnO3 nanoparticles coated with (3-aminopropyl) triethoxysilane

Cited by 22 publications

References 34 publications

Fundamental Insights into the Covalent Silane Functionalization of NiFe Layered Double Hydroxides

Fundamental Insights into the Covalent Silane Functionalization of NiFe Layered Double Hydroxides

Evaluation of the microstructure, optical properties and hopping conduction mechanism of rare earth doped Ba0.85Ca0.12RE0.03Ti0.90Zr0.04Nb0.042O3 ceramics (RE = Ce3+ and Pr3+)

Blue Light-Emitting Si Quantum Dots with Mesoporous and Amorphous Features: Origin of Photoluminescence and Potential Applications

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Evaluation of the microstructure, optical properties and hopping conduction mechanism of rare earth doped Ba_0.85Ca_0.12RE_0.03Ti_0.90Zr_0.04Nb_0.042O₃ ceramics (RE = Ce³⁺ and Pr³⁺)