PEG-directed microwave-assisted hydrothermal synthesis of spherical α-Ni(OH)2 and NiO architectures

Zhu, Zhiliang; Zhang, Yanbin; Zhang, Yanli; Liu, Hui; Zhu, Chunkui; Wu, Yingfeng

doi:10.1016/j.ceramint.2012.09.017

Cited by 18 publications

(5 citation statements)

References 24 publications

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“…The estimated band gap of NiO is 3.36 eV for MCM and 2.70 eV for CCM. Compared with the bulk band gap value of NiO (4.0 eV), the absorption edges of the pure NiO nano-and microstructures have red shifted, which is an evidence of the quantum confinement effect [33]. The band gap value may be influenced by various factors such as crystallite size, structural parameter, carrier concentrations, presence of impurities and lattice strain.…”

Section: Optical Properties (Diffuse Reflectance Spectroscopy)mentioning

confidence: 94%

Comparative investigation of NiO nano- and microstructures for structural, optical and magnetic properties

Manikandan¹,

Vijaya²,

Kennedy

2013

Physica E: Low-dimensional Systems and Nanostructures

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Section: Optical Properties (Diffuse Reflectance Spectroscopy)mentioning

confidence: 94%

Comparative investigation of NiO nano- and microstructures for structural, optical and magnetic properties

Manikandan¹,

Vijaya²,

Kennedy

2013

Physica E: Low-dimensional Systems and Nanostructures

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“…Table 1 Spherical morphologies and hollow structures via hydro(solvo)thermal synthesis. Teflon-lined autoclave and treated at 160 C for specific 30 min under the temperature-controlled mode in a MDS-8 microwave hydrothermal system [367] Praseodymium oxide + nitric acid+ NaF + ammonia + deionized water Placed in a microwave oven (650 W, 2.45 GHz) with a refluxing apparatus. The suspension was heated by microwave irradiation for 20 min at 70% of the maximum power under refluxing.…”

Section: Hollow Sphere and Porous Structuresmentioning

confidence: 99%

An overview into advantages and applications of conventional and unconventional hydro(solvo)thermal approaches for novel advanced materials design

Conti

Dey

Pottker

et al. 2022

Preprint

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The hydro(solvo)thermal approaches due to their simplicity and relatively low cost have attracted great attention to novel advanced materials processing with controlled particle sizes and well-defined morphologies, including the desirable obtaining of diverse metastable phases. Furthermore, in this case, such advanced materials obtained by this strategy generally have a high crystallinity structure as the main characteristic, which is interesting for a wide range of technological applications of high performance. This critical review presents the recent progress and challenges in conventional and unconventional hydro(solvo)thermal synthesis of novel advanced materials with desirable functionality and outstanding physicochemical properties designed using such methods. Finally, in this perspective, we believe that this detailed knowledge of the effect of processing parameters and as they will affect the prepared materials structure-composition-morphology is a key step to providing new chemical insights for the rational advanced materials design.

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“…By careful control of reaction parameters undesirable side reactions or phase transformations are minimized and lead to reduced defects as well as enhanced reaction rate and scaleability. Thus, this method is widely used to synthesize hollow spheres [ 12 , 13 ], one-dimensional materials such as tubes and wires [ 14 , 15 ], two-dimensional materials [ 16 , 17 ], and heterostructured materials [ 18 , 19 ].…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal Synthesis of Bismuth Ferrite Hollow Spheres with Enhanced Visible-Light Photocatalytic Activity

et al. 2023

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In recent years, semiconductor hollow spheres have gained much attention due to their unique combination of morphological, chemical, and physico-chemical properties. In this work, we report for the first time the synthesis of BiFeO3 hollow spheres by a facile hydrothermal treatment method. The mechanism of formation of pure phase BiFeO3 hollow spheres is investigated systematically by variation of synthetic parameters such as temperature and time, ratio and amount of precursors, pressure, and calcination procedures. The samples were characterized by X-ray powder diffraction, scanning electron microscopy, energy dispersive X-ray spectroscopy, and UV-vis diffuse reflectance spectroscopy. We observe that the purity and morphology of the synthesized materials are very sensitive to synthesis parameters. In general, the chemically and morphologically very robust hollow spheres have diameters in the range of 200 nm to 2 μm and a wall thickness of 50–200 nm. The synthesized BiFeO3 hollow spheres were applied as catalysts in the photodegradation of the model pollutant Rhodamine B under visible-light irradiation. Notably, the photocatalyst demonstrated exceptionally high removal efficiencies leading to complete degradation of the dye in less than 150 min at neutral pH. The superior efficiencies of the synthesized material are attributed to the unique features of hollow spheres. The active species in the photocatalytic process have been identified by trapping experiments.

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PEG-directed microwave-assisted hydrothermal synthesis of spherical α-Ni(OH)2 and NiO architectures

Cited by 18 publications

References 24 publications

Comparative investigation of NiO nano- and microstructures for structural, optical and magnetic properties

Comparative investigation of NiO nano- and microstructures for structural, optical and magnetic properties

An overview into advantages and applications of conventional and unconventional hydro(solvo)thermal approaches for novel advanced materials design

Hydrothermal Synthesis of Bismuth Ferrite Hollow Spheres with Enhanced Visible-Light Photocatalytic Activity

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