A simple solution calcination route to porous MgO nanoplates

Niu, Haixia; Yang, Qing; Tang, Kaibin; Xie, Yi

doi:10.1016/j.micromeso.2006.07.013

Cited by 39 publications

(30 citation statements)

References 45 publications

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“…Therefore, the PL spectrum mainly consists of two bands, peaking at approximately 2.91 eV in blue region and 2.39 eV in blue-green region, respectively. The similar blue emission has been previously observed in PL spectra of MgO nanowires [2] and MgO nanoplates [3], whereas the blue-green emission was found from MgO nanobelts [4]. Both blue and blue-green emissions may originate from defects in MgO, such as oxygen vacancies [3][4][5].…”

Section: Resultssupporting

confidence: 84%

Catalyst-Free Growth of Magnesium Oxide Whiskers and Their Characteristics

2008

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This study reports the production of magnesium oxide (MgO) whiskers on silicon (Si) substrates by the thermal heating of MgB 2 powders. We investigated the structural properties of the as-synthesized whiskers by using X-ray diffraction, transmission electron microscopy, selected area electron diffraction, and scanning electron microscopy. The product consisted of onedimensional whiskers with a square cross-section. The whiskers had a singlecrystalline cubic structure of MgO. The photoluminescence measurement with the Gaussian fitting exhibited visible light emission bands centered at 2.39 eV and 2.91 eV. We proposed the growth of MgO whiskers to follow the vapor-solid mechanism.

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Section: Resultssupporting

confidence: 84%

Catalyst-Free Growth of Magnesium Oxide Whiskers and Their Characteristics

2008

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“…The MA-3 sorbent carbonized at 723 K became black and was accompanied by a 16% larger surface area and a 27% higher CO 2 adsorption capability. In general, MgO nanoparticles tend to aggregate at high temperature driven by the minimization of surface energy, 35 which seems inconspicuous here, as the crystallite sizes and CO 2 adsorption capacities of MA-3, MA-4 and MA-5 samples were similar (Table 1). Carbonization at 873 K slightly increased the surface area of MA-6, at the same time reducing its carbon content, and ultimately expanding the exposure of MgO, thus, it captured 28.9 mg g À1 of CO 2 at 473 K (Table 1).…”

Section: Resultsmentioning

confidence: 85%

“…Formation and release of gaseous products such as CO 2 , moisture and acetone will leave behind some pores in the primary MgO particles. 26,35 Although the variation of gas ow rate in the range of 10-50 mL min À1 had no obvious inuence on the actual CO 2 adsorption of the resulting sample ( Fig. S4 †), the MA-5-s sample prepared in a N 2 atmosphere rather than a N 2 ow lacked pores [as shown in its TEM image ( Fig.…”

Section: Discussionmentioning

confidence: 99%

A novel porous MgO sorbent fabricated through carbon insertion

Wan

Wei

et al. 2014

J. Mater. Chem. A

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A new strategy utilizing carbon insertion to synthesize a highly efficient CO 2 -capturer through selfdispersion of MgO by co-existing carbon is reported in this paper. Carbon-adulterated magnesia is formed in situ during the carbonization of magnesium acetate for the first time, suppressing the aggregation of MgO nanoparticles and increasing the accessibility of basic sites for CO 2 . With few carbon particles (about 2%) inside as the adulterant, the porous MgO composites have a surface area of greater than 200 m 2 g À1 and a high CO 2 adsorption capacity of up to 28 mg g À1 at 473 K, offering a new candidate material for adsorbing CO 2 in flue gas vents.

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“…Regarding the PL properties of 1D MgO nanostructures, the violet, blue and blue-green emissions have been previously reported. [14][15][16][17][18][19] The influence of dopants on the PL properties of 1D MgO nanostructures have also been reported before. 20 21 However, the influence of SnO 2 coating and subsequent annealing has not been reported to date.…”

Section: Introductionmentioning

confidence: 55%

Preparation and Characterization of MgO Nanorods Coated with SnO<SUB>2</SUB>

Kim¹,

Jin²,

Kim³

et al. 2012

j. nanosci. nanotech.

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MgO nanorods have been grown by thermal evaporation of Mg3N2 powders on Si (100) substrates coated with gold (Au) thin films. The MgO nanorods grown on Al2O3 (0001) were 0.1-0.2 microm in diameter and up to a few tens of micrometers in length. MgO/SnO2 coaxial nanorods have also been prepared by atomic layer deposition (ALD) of SnO2 onto the nanorods. Transmission electron microscopy (TEM) and X-ray diffraction (XRD) analysis results indicate that the MgO-cores and the SnO2 shells of the annealed coaxial nanorods are of a single crystalline nature with cubic and orthorhombic structures, respectively. The photoluminescence (PL) spectroscopy analysis results show that SnO2 coating slightly increases the PL emission intensity of MgO nanorods. The PL emission of the SnO2-coated MgO nanorods is found to be considerably enhanced by thermal annealing and to strongly depend on the annealing atmosphere. The PL emission intensity of the MgO/SnO2 coaxial nanorods has been significantly increased by annealing in a reducing atmosphere. The origin of the PL enhancement by annealing in a reducing atmosphere is discussed on the basis of energy-dispersive X-ray spectroscopy analyses.

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A simple solution calcination route to porous MgO nanoplates

Cited by 39 publications

References 45 publications

Catalyst-Free Growth of Magnesium Oxide Whiskers and Their Characteristics

Catalyst-Free Growth of Magnesium Oxide Whiskers and Their Characteristics

A novel porous MgO sorbent fabricated through carbon insertion

Preparation and Characterization of MgO Nanorods Coated with SnO<SUB>2</SUB>

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