Fabrication of photoluminescent ZnO/SBA-15 through directly dispersing zinc nitrate into the as-prepared mesoporous silica occluded with template

Jiang, Qi; Wu, Zheng; Wang, Yi Meng; Cao, Yi; Zhou, Chun; Zhu, Jian Hua

doi:10.1039/b516061h

Cited by 176 publications

(72 citation statements)

References 28 publications

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“…The composite material shows no characteristic peaks of the wurtzite ZnO structure (curve 3). This observation correlates with the data of other authors on SBA-15 based composites [24,25] and can be interpreted either by the absence of ZnO in the material or as the presence of very small ZnO clusters formed inside the pores. We have ruled out the former interpretation by application of the chemical analysis method.…”

Section: X-ray Diffraction Resultssupporting

confidence: 81%

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Zinc oxide nanoparticles fabricated in the porous silica matrix by the sublimation method

Rudko¹,

Lashkaryov²,

Pisarzhevskii³

2015

Semicond. Phys. Quantum Electron. Optoelectron.

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Abstract. The nanocomposite -nanoporous silica (SBA-16) containing ZnO quantum dots -was fabricated by the sublimation method. This novel route of synthesizing ZnO nanoparticles implies physical sorption of zinc acetylacetonate precursor into the matrix pores from the gaseous phase, hydrolysis of the precursor, and thermal decomposition of the product with formation of ZnO nanoclusters directly inside the pores. The nanocomposite was characterized by XRD, nitrogen adsorption-desorption isotherms, and photoluminescence spectroscopy methods. We observed the blue shift of the ultraviolet luminescence of nanocomposite as compared to the luminescence of ZnO nanopowder as well as the decrease of the linewidth of the ultraviolet luminescence line, which points to the encapsulation of ZnO nanoparticles in the silica pores and narrowing of their size distribution.

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Section: X-ray Diffraction Resultssupporting

confidence: 81%

“…This observation points to the encapsulation of ZnO particles in the mesopores of SBA-16. The observed spectral position of the ultraviolet peak is also blue-shifted as compared to that observed in the PL spectra of ZnO/SBA-15 [24]. The latter composite was also obtained by using the solvent-free method, but of a different kind.…”

Section: Pl Resultsmentioning

confidence: 76%

Zinc oxide nanoparticles fabricated in the porous silica matrix by the sublimation method

Rudko¹,

Lashkaryov²,

Pisarzhevskii³

2015

Semicond. Phys. Quantum Electron. Optoelectron.

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“…3B) of 5% Zn on MCM-41, SBA-15 and SiO 2 show the amorphous nature of the samples while a single broad peak at 2h = 23.1 o (411) could be attributed to orthorhombic silica. There was no any reflection corresponding to ZnO phase, suggesting the well dispersed nature of ZnO particles on the support and/or inside the framework of mesoporous supports like MCM-41 and SBA-15 which is in accordance with the previous reports [33,34]. In case of alumina support (Fig.…”

Section: Catalyst Characterizationsupporting

confidence: 80%

Carbonylation of glycerol with urea to glycerol carbonate over supported Zn catalysts

et al. 2017

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Glycerol carbonylation with urea is a very feasible option to produce glycerol carbonate with a net result of CO 2 fixation through urea synthesis. The prerequisite of an efficient catalyst for this reaction is to possess both acid and basic sites together. Several acidic supports were screened for ZnO catalyst in this work and Zn/MCM-41 was found to exhibit the best activity and almost complete selectivity to glycerol carbonate (GC). Although, non-catalytic glycerol carbonylation resulted in GC formation but glycerol conversion achieved was twice with Zn/MCM-41 as a catalyst. Further to that increase in Zn loading from 2 to 5% resulted in increase in glycerol conversion from 63 to 82%. The prepared catalysts were characterized by XRD, NH 3 and CO 2 -TPD and effects of reaction parameters such as catalyst loading, glycerol to urea mole ratio and temperature on glycerol conversion and GC selectivity in batch mode of operation were also studied. Time on stream activity of 5% Zn/MCM-41 catalyst for continuous carbonylation of glycerol was also studied for *100 h with an average conversion of *55% and complete selectivity to GC. This indicated five times lower productivity of GC per h due to lower residence time than that in a batch operation as compared to that of a continuous operation. Activation energy estimated from the Arrhenius plot was found to be 39.82 kJ mol -1 suggesting that the reaction is kinetically controlled. A reaction pathway mediated by acid and basic sites of the Zn/MCM-41 catalyst is also proposed.

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“…While a carefully selected host material can result in broadening of light emission, it also gives additional stabilty to the ZnO film and prevents agglomeration of the grains. Of all the possible hosts, the research is mainly centred around the use of silicon and its varied complexes [3,4,5,6,7,8]. This is because of the key position of silicon in the microelectonic industry and its abiliy to emit in the red region in the nanophase.…”

Section: Introductionmentioning

confidence: 99%

Size and defect related broadening of photoluminescence spectra in ZnO:Si nanocomposite films

Shabnam¹,

Kant²,

Arun³

2012

Materials Research Bulletin

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Nanocomposite films of Zinc Oxide and Silicon were grown by thermal evaporation technique using varying ratios of ZnO:Si in the starting material. Analysis reveal the role of ZnO and amorphous silicon interface in contributing to relatively less common blue photoluminescence emissions (at ∼ 400 and 470nm). These blue peaks are observed along with the emissions resulting from band edge transition (370nm) and those related to defects (522nm) of ZnO. Careful analysis shows that along with the grain size of ZnO, a suitable compositional ratio (of ZnO to silicon) is critical for the coexistence of all the four peaks. Proper selection of conditions can give comparable photoluminescence peak intensities leading to broadband emission.

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Fabrication of photoluminescent ZnO/SBA-15 through directly dispersing zinc nitrate into the as-prepared mesoporous silica occluded with template

Cited by 176 publications

References 28 publications

Zinc oxide nanoparticles fabricated in the porous silica matrix by the sublimation method

Zinc oxide nanoparticles fabricated in the porous silica matrix by the sublimation method

Carbonylation of glycerol with urea to glycerol carbonate over supported Zn catalysts

Size and defect related broadening of photoluminescence spectra in ZnO:Si nanocomposite films

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