Optical properties of MgO and Mg(OH) 2 nanostructures synthesized by a chemical precipitation method using impure brine

Yousefi, Sadegh; Ghasemi, Behrooz; Tajally, Mohammad; Asghari, Alireza

doi:10.1016/j.jallcom.2017.04.036

Cited by 110 publications

(50 citation statements)

References 46 publications

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“…This was related to the [19,20]. Also, these results were in good match with other previous works which used pure precursor for the synthesis of MgO nanostructures [1,5,[21][22][23][24]. The synthesized MgO NPs from impure brine have geart potential in optoelectronics applications.…”

Section: Optical Propertiessupporting

confidence: 88%

“…Performed studies indicated that the morphology and characteristics (including optical, thermal, and etc.) of MNPs can be affected by the synthesis method and the process conditions such as, the reaction's temperature, precipitator agent's concentration, magnesium's concentration, type and concentration of the dispersing agent, suspension aging temperature and calcination's time and temperature [5].…”

Section: Introductionmentioning

confidence: 99%

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Precipitator concentration-dependent opto-structural properties of MgO nanoparticles fabricated using natural brine

Yousefi

Ghasemi

2020

SN Appl. Sci.

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In this paper, MgO nanoparticles (MNPs) were synthesized using simple wet chemical precipitation technique from evaporative brine as Mg ions precursor. The effect of NaOH concentration on morpho-structural and optical properties of as-synthesized nanoparticles was studied. The obtained nanoparticles were characterized by X-ray Diffraction (XRD), transmission electron microscopy (TEM), field emission scanning electron microscope (FESEM), energy dispersive X-ray (EDS), fourier transform infrared spectroscopy and UV-Vis absorption spectroscopy. The obtained structural properties (from XRD analysis) indicated that MNPs had pure cubic phase, high crystallinity, and average crystallite size and were in good agreement with TEM and FESEM characteristics. Also, increasing the concentration of the precipitator resulted in reduced crystallites size (from 37.09 to 17.61 nm), nanoparticles size (from 35-88 nm to 22-75 nm), and strain value (from 1.23 × 10-3 to 0.57 × 10-3). The optical properties of MNPs including absorption (A), transmittance (T), absorption coefficient (α), optical band gap energy (E g), Extinction coefficient (k), and refractive index (n) were investigated using UV-Vis spectroscopy and examined in details.

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Section: Optical Propertiessupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Precipitator concentration-dependent opto-structural properties of MgO nanoparticles fabricated using natural brine

Yousefi

Ghasemi

2020

SN Appl. Sci.

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“…In order to discover the observed changes in the IR bands of the different NPs, measurements in the frequency region of 450-900 cm -1 were undertaken. In Figure 10b, the characteristic peaks of two bands, centered at about 860 cm -1 [5,51] and 535 cm -1 [49,50] and 535 cm -1 centered bands, at that, this phenomenon is much more various inside the first band (Figure 11a). It should be noted on the active role of some point defects on the NPs surface, which could act as traps of adventitious CO 3 2− species, registered during the XPS studies.…”

Section: Ft-ir Spectramentioning

confidence: 87%

Effect of synthesis conditions on room-temperature ferromagnetic properties of Mg-O nanoparticles

Morozov

Sathasivam

Белоусова

et al. 2018

Journal of Alloys and Compounds

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Page 2: Considering the following sentence: "Experimentally RTFM has been observed in undoped MgO nanoparticles preferable synthesized by wet chemical routes", complete with: (see Table 1) A3: CORRECTED. 4) Page 2: Please, explain what the Author mean when they say: "the surface of such nanoparticles was not sufficiently clean" A4: CORRECTED as: "the surface of such nanoparticles could not sufficiently clean compared with NPs produced by gas-phase methods." Q5) Page 3: Substitute "metal magnesium" with "metallic magnesium" A5: "metal" is corrected to "metallic". 6) Page 4: Please, specify better the techniques that are used to evaluate the parameters listed in Table 2, or move the Table in the "Results and discussion" section A6: In page 4 the text was corrected as: "Some parameters of the NPs synthesis, including metal feed rates, gases flow rates, and corresponding collection zones are listed in Table 2. Table 2. Main properties of the Mg-O NPs. S-specific surface area obtained from BET measurements; -mean particle size obtained from SEM micrographs; y-MgO content and a-MgO lattice parameter obtained from XRD data; σ s-maximum specific magnetization (VSM, RT, 10 kOe)." 7) Page 5: As concerns the BET measurements, specify the measurements conditions (i.e., time, temperature, minimum pressure in outgassing procedure) A7: In the text on page 5 was added the sentence: "No outgassing procedures were applied before the BET measurements." 8) Page 6: Correct: "collected in the main zone" with "collected in the main zones" A8: CORRECTED. 9) Page 6: Considering the sentence: "In Figure 2a, NPs of about 50 nm in an average size is generally uniform cubes", please specify how the Authors evaluate the average size. From a first visual investigation, only the interval can be estimated. A9: In the text on page 5 written: "Particle size and morphology were investigated by scanning electron microscopy (SEM) using CARL ZEISS ULTRA PLUS. Electron micrographs were analyzed by Carl Zeiss AxioVision ver. 4.82 image processing software to calculate the average particle size ‹d› [22]." 10) Page 6: Author refer to the "Particle size distribution", but it is not reported. Did the Author evaluate the particles size distribution by SEM images? A10: Yes, see A12.

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“…In Figure a, broad peaks around 2θ values of 20° and 43.5° reflect (002) and (100) planes of amorphous carbon, which is often associated with the turbostratic structure of the carbons ,. There are no peaks for MgO impurities (generally, sharp peaks at 37°, 42.5°, 62.5°, 75° and 79° for MgO) in the pattern of APC3‐700, confirming high purity of APC3‐700. Raman spectra in Figure b show the characteristics of D‐band (1336 cm −1 ) and G‐band (1581 cm −1 ).…”

Section: Resultsmentioning

confidence: 76%

Controlled Fabrication of Interconnected Porous Carbon Nanosheets for Supercapacitors with a Long Cycle Life

Chen

Bai

et al. 2017

ChemElectroChem

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The pursuit of promising precursors and simple preparation approaches boosts the development of sustainable carbon‐related energy systems. In this work, a relatively low‐cost and eco‐friendly ternary precursor system is presented for the fabrication of interconnected sheet‐structured porous carbon materials by the combination of template‐assisted pyrolysis and post‐activation. The variation of effect factors permitted the formation of tunable microstructures with multilevel pore channels, and the optimized sample (APC3‐700) with multiple desired properties (such as, large surface area, hierarchical interconnected pores, and nitrogen doping) was successfully synthesized. Due to the large electrode/electrolyte interface, short pathway for mass/charge transfer, high electrochemical activity, and low transport resistance, APC3‐700 proved to be a favorable material with high capacitance (225 F g−1 at 1 A g−1) and a high rate profile (remaining 91 % at 20 A g−1). In particular, the symmetrical supercapacitor assembled demonstrated a long cycle life with almost no capacitance decaying over 20 000 cycles. The method used may be employed for the widespread development of nanosheet‐connected carbon materials from different sources for efficient enhancement of energy storage.

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Optical properties of MgO and Mg(OH) 2 nanostructures synthesized by a chemical precipitation method using impure brine

Cited by 110 publications

References 46 publications

Precipitator concentration-dependent opto-structural properties of MgO nanoparticles fabricated using natural brine

Precipitator concentration-dependent opto-structural properties of MgO nanoparticles fabricated using natural brine

Effect of synthesis conditions on room-temperature ferromagnetic properties of Mg-O nanoparticles

Controlled Fabrication of Interconnected Porous Carbon Nanosheets for Supercapacitors with a Long Cycle Life

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