Synthesis of Hollow ß-Phase GeO2 in Microemulsion

2013 ◽  
Vol 669 ◽  
pp. 360-365
Author(s):  
Xu Zou ◽  
Bing Bing Liu ◽  
Wei Wu ◽  
Dong Mei Li ◽  
Quan Jun Li ◽  
...  
Keyword(s):  
Optical Properties ◽  
Ostwald Ripening ◽  
Hollow Structure ◽  
Simple Method ◽  
Light Emitting ◽  
Hollow Interior ◽  
Potential Applications ◽  
One Step ◽  
Average Size ◽  
20 Nm

We fabricated mono-dispersed hollow waxberry shaped ß-quartz GeO2by a facile one-step synthesis in emulsion at room temperature. TEM images indicated that hollow waxberry shaped GeO2were consisted of nano-sphere whose average size were estimated to be 20 nm. The growth mechanism and optical properties of the products were also investigated. The possible formation mechanism of the hollow interior is proposed as the Ostwald ripening. The optical properties of the ß-GeO2nanoparticles with hollow shapes were also studied with photoluminescence spectrum, which reveals a broad emission, suggesting potential applications in electronic and optoelectronic nanodevices. These attractive results provide us a new simple method further used to fabricate other specific hollow structure and indicate hollow waxberry shaped GeO2may have potential applications in light-emitting nanodevices.

Preparation of hollow Fe3O4 spheres through a facile method and their applications

2017 ◽  
Vol 10 (06) ◽  
pp. 1750075 ◽  
Author(s):  
Xingping Wu ◽  
Aiping Zhu ◽  
Zhaodong Nan
Keyword(s):  
Saturation Magnetization ◽  
Ostwald Ripening ◽  
Solvothermal Method ◽  
Hollow Spheres ◽  
Hollow Structure ◽  
Solid Sphere ◽  
Small Particles ◽  
Potential Applications ◽  
One Step ◽  
Solid Spheres

Fe3O4 hollow microspheres with good dispersibility and high saturation magnetization were synthesized through a facile one-step solvothermal method. The formation mechanism of the hollow structure was studied by taking time-dependent experiments. Porous [Formula: see text]-FeOOH and [Formula: see text]-Fe2O3 nanosheets were firstly fabricated. Fe3O4 solid spheres aggregated by small particles were obtained from the transition of [Formula: see text]-FeOOH and [Formula: see text]-Fe2O3. Finally, the solid sphere is transferred to hollow sphere through Ostwald ripening. The maximum saturation magnetization of the hollow spheres is [Formula: see text][Formula: see text]emu/g, which is higher than some results reported in references. The Fe3O4 hollow spheres show potential applications in microwave absorption and photocatalysis.

In situ synthesis of NIR-light emitting carbon dots derived from spinach for bio-imaging applications

2017 ◽  
Vol 5 (35) ◽  
pp. 7328-7334 ◽  
Author(s):  
Liping Li ◽  
Ruiping Zhang ◽  
Chunxiang Lu ◽  
Jinghua Sun ◽  
Lingjie Wang ◽  
...  
Keyword(s):  
Optical Properties ◽  
Carbon Dots ◽  
In Situ Synthesis ◽  
Light Emitting ◽  
Nir Light ◽  
Bio Imaging ◽  
One Step

NIR-light emitting CDs (R-CDs) were prepared using spinach as a precursor by one-step solvothermal treatment. The R-CDs exhibited great optical properties, negligible toxicity, and superior labelling capability both in vitro and in vivo.

One-step preparation and characterization of core-shell SiO2/Ag composite spheres by pulse plating

2017 ◽  
Vol 24 (3) ◽  
pp. 423-427 ◽  
Author(s):  
Li Xiong ◽  
Xiangping Huang ◽  
Ya Liu ◽  
Liqing Pan
Keyword(s):  
Structural Characteristics ◽  
Pulse Plating ◽  
Core Shell ◽  
X Ray Diffraction ◽  
Simple Method ◽  
Transmission Electron ◽  
Surface Enhanced Raman ◽  
One Step ◽  
Enhanced Raman Scattering ◽  
20 Nm

AbstractA simple method of one-step pulse plating was used in the fabrication of core-shell SiO2/Ag composite spheres. Structural characteristics and morphologies of the prepared SiO2/Ag composite spheres are characterized by means of X-ray diffraction, scanning electron microscope, and transmission electron microscopy. The Ag shell is uniformly coated on the surface of SiO2 spheres with the thickness of about 20 nm. Photoluminescence (PL) spectrum has revealed that PL of the core-shell samples is much stronger than that of bare SiO2 spheres. Raman spectrometer measurements show that the SiO2/Ag composite spheres have excellent surface-enhanced Raman scattering performance. In addition, the current-voltage characteristic of SiO2/Ag composite spheres has improved at the same time.

Preparation and Photocatalysis Properties of TiO2/Graphene Nanocomposites

2012 ◽  
Vol 430-432 ◽  
pp. 1005-1008
Author(s):  
Dong Fang Wang ◽  
Da Chen ◽  
Guang Xing Ping ◽  
Chao Wang ◽  
Hai Zhen Chen ◽  
...  
Keyword(s):  
Solvothermal Method ◽  
Raw Materials ◽  
Chemical Oxidation ◽  
Graphene Nanocomposites ◽  
Photocatalytic Activities ◽  
Potential Applications ◽  
Tio2 Nanomaterials ◽  
One Step ◽  
20 Nm ◽  
Commercial Tio2

In this work, a novel photocatalyst with excellent photocatalytic activities was developed by the combination of TiO2 with graphene oxide (GO). GO was firstly prepared by the chemical oxidation of graphite through Hummers method and the subsequent dispersion and exfoliation in water. Then, GO and P25 nanoparticles (commercial TiO2) were used as raw materials to synthesize TiO2/graphene (TiO2/GE) nanocomposites by using a one-step solvothermal method. TEM images clearly showed that TiO2 nanomaterials (the size of about 15~20 nm) were distributed well onto the two-dimensional (2D) graphene sheets, indicating the formation of TiO2/GE nanocomposites. XRD results indicated that TiO2/GE nanocomposites exhibited TiO2 crystalline phase structure. Meanwhile, it was demonstrated from the methylene blue (MB) photodegradation results that TiO2/GE nanocomposites possessed excellent photocatalytic activities with potential applications.

Facile Synthesis and Luminescence Properties of Gd2O3:Eu3+ Hollow Spheres

2014 ◽  
Vol 998-999 ◽  
pp. 55-58
Author(s):  
Cui Miao Zhang ◽  
Jian Yuan Wang ◽  
Ya Min Liu ◽  
Guang Jia
Keyword(s):  
Hollow Spheres ◽  
Hollow Structure ◽  
Spherical Shape ◽  
Precipitation Method ◽  
Main Process ◽  
Flat Panel Displays ◽  
Light Emitting ◽  
Potential Applications ◽  
Biological Labeling ◽  
Aqueous Conditions

Well-dispersed, uniform Gd2O3:Eu3+ hollow microspheres have been successfully fabricated via a urea-based homogeneous precipitation method in the presence of colloidal carbon spheres as template, followed by subsequent heat treatment. The main process was carried out under aqueous conditions without any organic solvents, surfactants, or etching agents. The as-obtained Gd2O3:Eu3+ spheres with a spherical shape and hollow structure are uniform in size and distribution, and the diameters of the spheres and thickness of the shell are about 500 nm and 50 nm, respectively. The Gd2O3:Eu3+ hollow spheres exhibit strong red emission corresponding to the 5D0-7F2 transition of the Eu3+ ions under ultraviolet excitation, which might find potential applications in the fields such as light-emitting phosphors, advanced flat panel displays, or biological labeling.

Novel iridium complexes with polymer side-chains

2004 ◽  
Vol 846 ◽  
Author(s):  
Elisabeth Holder ◽  
Veronica Marin ◽  
Emine Tekin ◽  
Dmitry Kozodaev ◽  
Michael A. R. Meier ◽  
...  
Keyword(s):  
Optical Properties ◽  
Morphological Properties ◽  
Side Chains ◽  
Iridium Complexes ◽  
Light Emitting ◽  
Force Microscopy ◽  
Novel Materials ◽  
Atomic Force ◽  
Local Current ◽  
Potential Applications

ABSTRACTThe focus of the presented research lies on the synthesis of novel charged iridium(III) compounds with potential applications in light-emitting electrochemical cells. The design involves iridium(III)-based materials with polymer side-chains leading to linear light-emitting polymer arrangements.To study the electro-optical properties of such light-emitting polymers conventional and combinatorial deposition methods are used. Straightforward screening approaches are introduced. The combinatorial efforts engage the processing via inkjet printing and the screening of the optical properties using plate reader technologies based on steady state UV-vis and fluorescence. Furthermore, the morphological properties are investigated using optical interferometry and atomic force microscopy (AFM). Overall it can be shown that novel materials can be deposited revealing high-quality thin films, which allow the screening of electro-optical features using combinatorial methods. Some initial local current density studies by AFM have also been performed to characterize the current injection and transport properties of the novel materials.

Recent investigations on nonlinear absorption properties of carbon nanotubes

Nanophotonics ◽  
2020 ◽  
Vol 9 (4) ◽  
pp. 761-781 ◽  
Author(s):  
Hongwei Chu ◽  
Ying Li ◽  
Cong Wang ◽  
Han Zhang ◽  
Dechun Li
Keyword(s):  
Carbon Nanotubes ◽  
Optical Properties ◽  
Nonlinear Optical ◽  
Materials Science ◽  
Hollow Structure ◽  
Future Research ◽  
Nanometer Scale ◽  
Absorption Properties ◽  
Potential Applications ◽  
Carbon Based Nanomaterials

AbstractCarbon nanotubes (CNTs) are carbon based nanomaterials with long hollow structure and diameter at the nanometer scale. The chirality in combination with the radius determines the unique properties of CNTs. These CNTs with different properties have wide applications in the nanotechnology, electronics, photonics, and other fields in materials science and technology. In this review, we highlight the recent investigations on the nonlinear optical properties and applications in the lasers. The future research aspects and potential applications are discussed at the end of the review.

scholarly journals Mossbauer Investigations in Hematite Nanoparticles

2021 ◽  
Vol 12 (4) ◽  
pp. 4626-4636
Keyword(s):  
Sol Gel ◽  
Weighted Average ◽  
Ferromagnetic Behavior ◽  
Morin Transition ◽  
Hematite Nanoparticles ◽  
Hematite Phase ◽  
Potential Applications ◽  
Average Size ◽  
20 Nm ◽  
Structural Characterizations

Hematite nanoparticles of average size 20 nm were synthesized using the sol-gel method, and the structural characterizations were conducted using XRD and TEM. The XRD profile revealed a small fraction of the maghemite phase and the main hematite phase. Mössbauer spectroscopy was used to study the magnetic structure of the particles and revealed a third but very slight non-magnetic phase. Mössbauer spectrum shows 35% of the nanoparticles exhibiting superparamagnetism. The weighted average Morin transition temperature for the particles determined by Mössbauer is 262 K, which is remarkably similar to the bulk value and higher than the Morin transition determined by VSM (about 250 K). The reported findings on the hematite nanoparticles will help understand the enhanced ferromagnetic behavior of the hematite nanoparticles at room temperature, which is crucial for potential applications.

scholarly journals Advance Optical Properties and Emerging Applications of 2D Materials

2021 ◽  
Vol 8 ◽  
Author(s):  
Partha Kumbhakar ◽  
Chinmayee Chowde Gowda ◽  
Chandra Sekhar Tiwary
Keyword(s):  
Optical Properties ◽  
Optical Sensors ◽  
Near Infrared ◽  
Surface Defects ◽  
2D Materials ◽  
Metal Organic Framework ◽  
Perovskite Oxide ◽  
Light Emitting ◽  
Optical Sensitivity ◽  
Potential Applications

In the last several decades, significant efforts have been devoted to two-dimensional (2D) materials on account of their optical properties that have numerous applications in the optoelectronic world in the range of light-emitting diodes, optical sensors, solar energy conversion, photo-electrochemical cells, photovoltaic solar cells, and even the biomedical sector. First, we provide an outline of linear optical properties of 2D materials such as graphene, TMDs, h-BN, MXenes, perovskite oxide, and metal-organic framework. Then, we discuss the optoelectronic properties of the 2D materials. Along with these, we also highlight the important efforts in developing 2D optical materials with intensive emission properties at a broad wavelength from ultraviolet to near-infrared. The origin of this tunable emission has been discussed decoratively. Thickness and layer-dependent optical properties have been highlighted and are explained through surface defects, strain, vacancy, doping, and dangling bonds emerging due to structural change in the material. The linear and nonlinear optical properties in 2D MXene and perovskite oxides are also impressive due to their potential applications in next-generation devices with excellent optical sensitivity. Finally, technological innovations, challenges, and possible tuning of defects and imperfections in the 2D lattice are discussed.

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