Uniform and Well-Dispersed LuBO3 Hollow Microspheres: Synthesis, Formation and Photoluminescence Properties

2018 ◽  
Vol 18 (12) ◽  
pp. 8302-8306 ◽  
Author(s):  
Yu Gao ◽  
Baotong Xu ◽  
Feixue Ai ◽  
Guiyan Zhao ◽  
Yanfeng Bi ◽  
...  
Keyword(s):  
Uv Light ◽  
Exchange Process ◽  
Hollow Spheres ◽  
Average Diameter ◽  
Hollow Microspheres ◽  
Precipitation Method ◽  
Ion Exchange Process ◽  
Potential Applications ◽  
First Time ◽  
Display Systems

A hard template strategy is developed to fabricate the LuBO3: Eu3+/Tb3+ hollow microspheres using a novel multi-step transformation synthetic route for the first time with polystyrene (PS) spheres as the template, followed by the combination of a facile homogeneous precipitation method, an ion-exchange process, and a calcination process. The results show that the as-obtained LuBO3: Eu3+/Tb3+ hollow spheres have a uniform morphology with an average diameter of 1.8 μm and shell thickness of about 80 nm. When used as luminescent materials, the emission colors of LuBO3: Eu3+/Tb3+ samples can be tuned from red, through orange, yellow and green–yellow, to green by simply adjusting the relative doping concentrations of the activator ions under the excitation of ultraviolet (UV) light, which might have potential applications in the field such as light display systems and optoelectronic devices.

scholarly journals Large-scale fabrication of porous YBO 3 hollow microspheres with tunable photoluminescence

2018 ◽  
Vol 5 (4) ◽  
pp. 172186 ◽  
Author(s):  
Zhenhe Xu ◽  
He Yu ◽  
Feixue Ai ◽  
Guiyan Zhao ◽  
Yanfeng Bi ◽  
...  
Keyword(s):  
High Performance ◽  
Large Scale ◽  
Low Cost ◽  
Exchange Process ◽  
Hollow Spheres ◽  
Average Diameter ◽  
Hollow Microspheres ◽  
Precipitation Method ◽  
Polystyrene Spheres ◽  
Ion Exchange Process

Hollow lanthanide-doped compounds are some of the most popular materials for high-performance luminescent devices. However, it is challenging to find an approach that can fabricate large-scale and well-crystallized lanthanide-doped hollow structures and that is facile, efficient and of low cost. In this study, YBO 3 : Eu 3+ /Tb 3+ hollow microspheres were fabricated by using a novel multi-step transformation synthetic route for the first time with polystyrene spheres as the template, followed by the combination of a facile homogeneous precipitation method, an ion-exchange process and a calcination process. The results show that the as-obtained YBO 3 : Eu 3+ /Tb 3+ hollow spheres have a uniform morphology with an average diameter of 1.65 µm and shell thickness of about 160 nm. When used as luminescent materials, the emission colours of YBO 3 : Eu 3+ /Tb 3+ samples can be tuned from red, through orange, yellow and green-yellow, to green by simply adjusting the relative doping concentrations of the activator ions under the excitation of ultraviolet light, which might have potential applications in fields such as light display systems and optoelectronic devices.

scholarly journals Large-scale synthesis and luminescence of GdPO4 hollow microspheres

RSC Advances ◽  
2018 ◽  
Vol 8 (39) ◽  
pp. 21857-21862 ◽  
Author(s):  
Yu Gao ◽  
Yongkun Qiu ◽  
Xin Wang ◽  
Yanfeng Bi ◽  
Guiyan Zhao ◽  
...  
Keyword(s):  
Ion Exchange ◽  
Large Scale ◽  
Exchange Process ◽  
Hollow Microspheres ◽  
Precipitation Method ◽  
Homogeneous Precipitation ◽  
Calcination Process ◽  
Ion Exchange Process ◽  
Homogeneous Precipitation Method ◽  
First Time

GdPO4 hollow microspheres were synthesized by using a novel multi-step route for the first time with polystyrene (PS) spheres as the template, followed by the combination of a facile homogeneous precipitation method, an ion-exchange process, and a calcination process.

Synthesis and up-conversion photoluminescence properties of uniform monodisperse YbPO4:Ln3+ (Ln3+ = Er3+, Tm3+, Ho3+) hollow microspheres

2017 ◽  
Vol 41 (17) ◽  
pp. 8959-8964 ◽  
Author(s):  
Zhenhe Xu ◽  
Yanfeng Bi ◽  
He Yu ◽  
Junying Lin ◽  
Fu Ding ◽  
...  
Keyword(s):  
Ion Exchange ◽  
Exchange Process ◽  
Hollow Microspheres ◽  
Homogeneous Precipitation ◽  
Photoluminescence Properties ◽  
Calcination Process ◽  
Ion Exchange Process ◽  
First Time

Uniform monodisperse YbPO4 hollow microspheres have been successfully synthesized via the combination of a facile homogeneous precipitation approach, an ion-exchange process, and a calcination process for the first time.

Green-Chemical Synthesis of ETS-4 Zeotypes for Photocatalytic Hydrogen Production

2012 ◽  
Vol 584 ◽  
pp. 366-370 ◽  
Author(s):  
M.V. Shankar ◽  
Jin Hua Ye
Keyword(s):  
Uv Light ◽  
Exchange Process ◽  
Photocatalytic Efficiency ◽  
Methanol Reforming ◽  
Synthesis Time ◽  
Ion Exchange Process ◽  
Green Chemical Synthesis ◽  
Electron Transfer Properties ◽  
Synthesized Materials ◽  
First Time

Pristine ETS-4, a microporous titanosilicate zeotype material was successfully synthesized by using inorganic alkaline-sols as precursors for the first time. Use of halogen/organic free medium, drastic reduction in excess amount of alkali precursors and short synthesis time makes this methodology much more versatile. Sr-ETS-4 material was prepared using ion-exchange process. Structural, optical, bulk and surface properties of the synthesized materials were thoroughly examined and their properties are interpreted. The photocatalytic experiments were conducted under UV light irradiation. Further, Sr-ETS-4 material has showed ca. 4 times higher photocatalytic efficiency for photocatalytic methanol reforming as compared with pristine ETS-4 catalyst. The observed higher photocatalytic efficiency of Sr-ETS-4 catalyst might be attributed to better electron transfer properties of Sr-ion and semiconducting property of one-dimensional titanium chains within zeotype structure.

Universal route to fabricate facile and flexible micro-supercapacitors with gold-coated silver electrodes

RSC Advances ◽  
2016 ◽  
Vol 6 (85) ◽  
pp. 81936-81942 ◽  
Author(s):  
Yizhen Yu ◽  
Jian Zhang ◽  
Wu Zhang ◽  
Ruili Liu ◽  
Xing Wu ◽  
...  
Keyword(s):  
Ion Exchange ◽  
Exchange Process ◽  
Protective Layer ◽  
Cost Effective ◽  
Ion Exchange Process ◽  
Silver Electrodes ◽  
First Time ◽  
Immersion Plating

For the first time, a facile, cost-effective and universal route to fabricate the flexible Ag@Au MSCs was proposed. Au protective layer improves the performances of MSCs. This technique combines surface ion-exchange process with immersion plating.

scholarly journals BIODEGRADABLE GELATIN DECORATED Fe3O4 NANOPARTICLES FOR PACLITAXEL DELIVERY

2018 ◽  
Vol 55 (1B) ◽  
pp. 7 ◽  
Author(s):  
Dai Hai Nguyen
Keyword(s):  
Fe3o4 Nanoparticles ◽  
Drug Loading ◽  
Spherical Shape ◽  
Average Diameter ◽  
Precipitation Method ◽  
Loop Analysis ◽  
Transmission Electron ◽  
Potential Applications ◽  
Size And Morphology ◽  
Co Precipitation

The objective of this study is to prepare biodegradable iron oxide nanoparticles with gelatin (GEL) for paclitaxel (PTX) delivery. In detail, Fe3O4 nanoparticles were prepared and then coated them with GEL (Fe3O4@GEL) conjugate by co–precipitation method. Furthermore, the formation of Fe3O4@GEL was demonstrated by Fourier transform infrared (FT–IR) and powder X–ray diffraction (XRD). The superparamagnetic property of Fe3O4@GEL was also showed by hysteresis loop analysis, the saturation magnetization reached 20.36 emu.g–1. In addition, size and morphology of Fe3O4@GEL nanoparticles were determined by transmission electron microscopy (TEM). The results indicated that Fe3O4@GEL nanoparticles were spherical shape with average diameter of 10 nm. Especially, PTX was effectively loaded into the coated magnetic nanoparticles, 86.7 ± 3.2 % for drug loading efficiency and slowly released up to 5 days. These results suggest that the potential applications of Fe3O4@GEL nanoparticles in the development of stable drug delivery systems for cancer therapy.

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.

Template-Directed Synthesis and Upconversion Luminescence of Y2O3 Hollow Spheres

2014 ◽  
Vol 1052 ◽  
pp. 198-202 ◽  
Author(s):  
Cui Miao Zhang ◽  
Jian Yuan Wang ◽  
Ya Min Liu ◽  
Guang Jia
Keyword(s):  
Upconversion Luminescence ◽  
Hollow Spheres ◽  
Spherical Shape ◽  
Hollow Microspheres ◽  
Flat Panel Displays ◽  
Sem Images ◽  
Calcination Process ◽  
Potential Applications ◽  
Subsequent Calcination ◽  
Light Excitation

Uniform Y2O3 hollow microspheres have been successfully prepared via a urea-based homogeneous precipitation technique with colloidal carbon spheres as template followed by a subsequent calcination process. The template can be effectively removed and the amorphous precursor has converted to crystalline Y2O3 during the annealing process. SEM images indicate that the hollow spheres inherit the spherical shape and good dispersion of the templates, and the shell of the hollow spheres is composed of a large amount of uniform nanoparticles. The lanthanide activator ion Ln3+-doped Y2O3 hollow microspheres exhibit bright upconversion luminescence with different colors under 980 nm light excitation, which may find potential applications in the fields such as light phosphor powders, advanced flat panel displays, or drug delivery.

scholarly journals Photocatalytic Performances and Antibacterial Activities of Nano-Zno Derived By Cetrimide-Based Co-Precipitation Method by Varying Solvents

2019 ◽  
Vol 9 (2) ◽  
pp. 930-938
Keyword(s):  
Dye Degradation ◽  
Uv Light ◽  
Cost Effective ◽  
Antibacterial Activities ◽  
Precipitation Method ◽  
Zno Nanostructures ◽  
Sem Images ◽  
Potential Applications ◽  
Powder Samples ◽  
Co Precipitation

In this work, zinc oxide nanoparticles have been synthesized by cost-effective and based on the efficient cetrimide and varying solvents are using the method of co-precipitation annealing at 350 C. The resultant powder samples were characterized well by means of XRD, SEM, FT-IR, PL and UV-visible DRS spectroscopy. Among them, XRD exhibits ZnO has the structure of hexagonal wurtzite with a preferred orientation of 101 planes. It is noted in ZnO represented in SEM images have different solvents and cetrimide has a strong influence on the morphology of ZnO nanostructures that are to be sized are 50nm, 70nm, 90nm 100nm. It confirms that the changes in the band-gap from UV-vis DRS data. The presence of Zn-O confirms various functional groups decomposed in the sample from FTIR data. The PL study states that the emission band available at approximately 410nm and checks the recombination level shows low, further, it correlates with good photocatalytic properties. The sunlight measured by Lux meter and dye degradation studies is done by a simple aeration photocatalytic technique represents 95% degradations and under UV light is 85%. Besides, the scavengers of the responsive species of during the degradation were additionally examined for photocatalytic mechanism. An antibacterial activity is enhanced significantly, which is based on the attribution of Nano features of ZnO nanostructures for p. aeruginosa bacteria. Thus, this study paved the way for potential applications of photocatalytic and antibacterial activities.

TiO2 HOLLOW SPHERES: ONE-POT SYNTHESIS AND ENHANCED PHOTOCATALYSIS

2013 ◽  
Vol 06 (03) ◽  
pp. 1350025 ◽  
Author(s):  
CHANGCHAO JIA ◽  
YONGQIANG CAO ◽  
PING YANG
Keyword(s):  
Uv Light ◽  
Large Diameter ◽  
Hollow Spheres ◽  
Hollow Microspheres ◽  
Hydrolysis Rate ◽  
One Pot ◽  
Cavity Structure ◽  
Tio2 Hollow Spheres ◽  
Low Solubility ◽  
Solid Spheres

Hollow TiO2 microspheres were successfully fabricated by metal salts with low solubility in ethanol acting as intelligent templates using a simple one-pot solvothermal method. Hollow spheres with large diameter were obtained using CuSO4⋅5H2O as templates while small ones were obtained using Sr(NO3)2 as templates. It is found that titanium precursor plays an important role for the morphology of samples. Solid TiO2 microspheres were prepared by using titanium tetrabutoxide (TBT). In contrast, bowl-like hollow microspheres were obtained by using titanium tetrachloride (TiCl4) . Furthermore, the amount of H2O can stimulate the hydrolysis rate of TiCl4 to form solid spheres. Compared with solid microspheres, hollow TiO2 microspheres depending on their interior cavity structure exhibited enhanced photocatalysis efficiency for the UV-light photodegradation of methyl orange. Quantificationally, the apparent photocatalytic degradation pseudo-first-rate constant of the hollow microspheres is 1.25 times of that of the solid ones.

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