Correlation of magnetic properties with microstructural properties for columnar-structured (Zn1−xMnx)O/Al2O3 (0001) thin films

Lee, Sejoon; Kang, Tae Won; Kim, Deuk Young

doi:10.1016/j.jcrysgro.2005.06.040

Cited by 18 publications

(4 citation statements)

References 29 publications

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“…In addition, in our previous studies [14,15], we had observed that the ferromagnetic properties are strongly related to crystallographic properties corresponding to the microstructural aspect and the lattice distribution. Thus, the variation of surface textures of the (Zn 1-x Mn x )O thin films with varying P O 2 should be considered as a primary task.…”

Section: Resultsmentioning

confidence: 89%

Effects of oxygen partial pressure during sputtering growth on physical properties of Zn0.93Mn0.07O thin films

Lee

Hwang

et al. 2006

Journal of Crystal Growth

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Section: Resultsmentioning

confidence: 89%

Effects of oxygen partial pressure during sputtering growth on physical properties of Zn0.93Mn0.07O thin films

Lee

Hwang

et al. 2006

Journal of Crystal Growth

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“…This means that all three, S-Si, R-Si, and B-Si, were well crystallized via magnesiothermic reduction from the biomass resources of the S-RH, R-RH, and B-RH ashes, respectively. By using the Scherer formula [54][55][56], the average crystallite sizes of the S-Si, R-Si, and B-Si nanocrystals were determined to be 33, 28, and 22 nm, respectively. This corroborates the dependence of the Si nanocrystal size on the kind of biomass raw source; i.e., the Si nanocrystal size relies on the different Si contents in each RH, as confirmed in Figure 2.…”

Section: Structural and Vibrational Propertiesmentioning

confidence: 99%

Derivation of Luminescent Mesoporous Silicon Nanocrystals from Biomass Rice Husks by Facile Magnesiothermic Reduction

Lee

2021

Nanomaterials

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High-quality silicon (Si) nanocrystals that simultaneously had superior mesoporous and luminescent characteristics were derived from sticky, red, and brown rice husks via the facile and cost-effective magnesiothermic reduction method. The Si nanocrystals were confirmed to comprise an aggregated morphology with spherical nanocrystals (e.g., average sizes of 15–50 nm). Due to the surface functional groups formed at the nanocrystalline Si surfaces, the Si nanocrystals clearly exhibited multiple luminescence peaks in visible-wavelength regions (i.e., blue, green, and yellow light). Among the synthesized Si nanocrystals, additionally, the brown rice husk (BRH)-derived Si nanocrystals showed to have a strong UV absorption and a high porosity (i.e., large specific surface area: 265.6 m2/g, small average pore diameter: 1.91 nm, and large total pore volume: 0.5389 cm3/g). These are indicative of the excellent optical and textural characteristics of the BRH-derived Si nanocrystals, compared to previously reported biomass-derived Si nanocrystals. The results suggest that the biomass BRH-derived Si nanocrystals hold great potential as an active source material for optoelectronic devices as well as a highly efficient catalyst or photocatalyst for energy conversion devices.

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“…In the composite of MnO 2 -AC, two additional peaks from C (002) and C (100) phases were observed at 23.2 and 43.2 • because of the agglomeration of AC and α-MnO 2 [36][37][38]45,46]. Using Scherer's law [47][48][49], the average crystalline size of the MnO 2 and MnO 2 -AC were calculated to be approximately 32 nm and 28 nm, respectively. [28,39,44].…”

Section: Topographical and Compositional Propertiesmentioning

confidence: 99%

Upcycling of Wastewater via Effective Photocatalytic Hydrogen Production Using MnO2 Nanoparticles—Decorated Activated Carbon Nanoflakes

et al. 2020

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In the present work, we demonstrated the upcycling technique of effective wastewater treatment via photocatalytic hydrogen production by using the nanocomposites of manganese oxide-decorated activated carbon (MnO2-AC). The nanocomposites were sonochemically synthesized in pure water by utilizing MnO2 nanoparticles and AC nanoflakes that had been prepared through green routes using the extracts of Brassica oleracea and Azadirachta indica, respectively. MnO2-AC nanocomposites were confirmed to exist in the form of nanopebbles with a high specific surface area of ~109 m2/g. When using the MnO2-AC nanocomposites as a photocatalyst for the wastewater treatment, they exhibited highly efficient hydrogen production activity. Namely, the high hydrogen production rate (395 mL/h) was achieved when splitting the synthetic sulphide effluent (S2− = 0.2 M) via the photocatalytic reaction by using MnO2-AC. The results stand for the excellent energy-conversion capability of the MnO2-AC nanocomposites, particularly, for photocatalytic splitting of hydrogen from sulphide wastewater.

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Correlation of magnetic properties with microstructural properties for columnar-structured (Zn1−xMnx)O/Al2O3 (0001) thin films

Cited by 18 publications

References 29 publications

Effects of oxygen partial pressure during sputtering growth on physical properties of Zn0.93Mn0.07O thin films

Effects of oxygen partial pressure during sputtering growth on physical properties of Zn0.93Mn0.07O thin films

Derivation of Luminescent Mesoporous Silicon Nanocrystals from Biomass Rice Husks by Facile Magnesiothermic Reduction

Upcycling of Wastewater via Effective Photocatalytic Hydrogen Production Using MnO2 Nanoparticles—Decorated Activated Carbon Nanoflakes

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