Enhanced photoluminescence of Fe3O4@Y2O3:Eu3+ bifunctional nanoparticles by the Gd3+ co-doping

Wu, Tianhui; Pan, Huayan; Chen, Rubiao; Luo, Dong; Zhang, Hong; Shen, Ye; Lü, Bin; Huang, Jie; Li, Yanghui; Wang, Le

doi:10.1016/j.jallcom.2016.01.130

Cited by 17 publications

(3 citation statements)

References 23 publications

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“…An additional doping of the Zn-containing magnetic oxide prepared with 0.25 mmol of Zn(acac) 2 (similar to PPQ–Zn-2) using the smallest amounts of Co or Ni species (PPQ–Zn-Co-3 and PPQ–Zn-Ni-4, Table ) leads to a prominent increase of PL. The enhanced luminescence due to the codoping of Gd 3+ was observed in (Y,Gd)BO 3 :Eu 3+ and Fe 3 O 4 @(Y 1– x Gd x ) 2 O 3 :Eu 3+ and attributed to the energy transfer between Gd 3+ and Eu 3+ . On the other hand, Co- and Ni-doping of ZnO was reported to lead to significant PL quenching, , revealing that in doped Zn-containing magnetic oxides there is no doping of the ZnO phase, but rather, there is codoping of Zn 2+ with Co 2+ (or Ni 2+ ) into Fe 3 O 4 .…”

Section: Results and Discussionmentioning

confidence: 95%

Enhancing the Catalytic Activity of Zn-Containing Magnetic Oxides in a Methanol Synthesis: Identifying the Key Factors

Baird

Dittmar

Losovyj

et al. 2017

ACS Appl. Mater. Interfaces

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A new family of Ni-, Co-, and Cr-doped Zn-containing magnetic oxide nanoparticles (NPs) stabilized by polyphenylquinoxaline (PPQ) and hyperbranched pyridylphenylene polymer (PPP) has been developed. These NPs have been synthesized by thermal decomposition of Zn and doping metal acetylacetonates in the reaction solution of preformed magnetite NPs, resulting in single-crystal NPs with spinel structure. For the PPQ-capped NPs, it was demonstrated that all three types of metal species (Fe, Zn, and a doping metal) reside within the same NPs, the surface of which is enriched with Zn and a doping metal, while the deeper layers are enriched with Fe. The Cr-doped NPs at the high Cr loading are an exception due to favored deposition of Cr on magnetite located in the NP depth. The PPP-capped NPs exhibit similar morphology and crystallinity; however, the detailed study of the NP composition was barred due to the high PPP amount retained on the NP surface. The catalyst testing in syngas conversion to methanol demonstrated outstanding catalytic properties of doped Zn-containing magnetic oxides, whose activities are dependent on the doping metal content and on the stabilizing polymer. The PPP stabilization allows for better access to the catalytic species due to the open and rigid polymer architecture and most likely optimized distribution of doping species. Repeat experiments carried out after magnetic separation of catalysts from the reaction mixture showed excellent catalyst stability even after five consecutive catalytic runs.

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Section: Results and Discussionmentioning

confidence: 95%

Enhancing the Catalytic Activity of Zn-Containing Magnetic Oxides in a Methanol Synthesis: Identifying the Key Factors

Baird

Dittmar

Losovyj

et al. 2017

ACS Appl. Mater. Interfaces

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“…The introduction of Gd 2 O 3 :Tb 3+ and SiOx (weak and non-magnetic materials) in the composites results in the decrease in the proportion of magnetic materials in the total sample [43,44]. Another reason is attributed to Fe 3 O 4 particles coated with a layer of Gd 2 O 3 :Tb 3+ fluorescence materials [45]. However, the saturation magnetization of Fe 3 O 4 @Gd 2 O 3 :Tb 3+ @SiOx nanoparticles is much higher than that of Gd 2 O 3 (2.257 emu g −1 ).…”

Section: Magnetic Propertymentioning

confidence: 99%

Synthesis of Fe₃O₄@Gd₂O₃:Tb³⁺@SiOx multifunctional nanoparticles and their luminescent, magnetic and hyperthermia properties

Yang

et al. 2020

Nanotechnology

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Multifunctional Fe 3 O 4 @Gd 2 O 3 :Tb 3+ @SiOx nanoparticles were successfully synthesized by co-precipitation and polyol methods. The synthesized nanoparticles were composed by cubic phase as core of Fe 3 O 4 and Gd 2 O 3 :Tb 3+ and the shell of amorphous SiOx. The composites exhibited a spherical shape with a diameter of 10-15 nm and highly uniform dispersion. They showed not only excellent fluorescence under excitation at a wavelength of 278 nm, but also strong magnetic responsiveness (M S = 24.040 emu g −1 ). The results of magnetic resonance imaging in vitro (r 1 = 6.00 mm −1 s −1 , r 2 = 63.95 mm −1 s −1 ) showed that the samples could be used as T 1 -positive and T 2 -negative contrast agents. In addition, it was found that Fe 3 O 4 @Gd 2 O 3 :Tb 3+ @SiOx attains hyperthermia temperature (43 • C) in 90 s under the alternating current magnetic field, and their specific absorption rate (229.9 w g −1 ) was higher than that of Fe 3 O 4 (183.92 w g −1 ). Hence, the multifunctional nanoparticle could be used for the diagnosis and therapy of cancer.

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“…Many researchers have introduced the use of Novel bifunctional Nd:YAG/Fe 3 O 4 nanocomposite as nanothermometer/ nanoheater for potential biomedical applications E M Tejeda 1 , M Arámburo 2 , E Vargas 2 , O E Contreras 1 and G A Hirata 1 magnetite NPs in hyperthermia treatments, their work relies on the close-to-non toxicity levels of these NPs, and its excellent superparamagnetic character [8][9][10][11]. While some report the usage of this material in combination with phosphors [1,[12][13][14][15] mainly for tagging, bioimaging purposes, drugdelivery [14,16,17]; only a few report these materials as heater/optical thermometer nanocomposite [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Novel bifunctional Nd:YAG/Fe₃O₄ nanocomposite as nanothermometer/nanoheater for potential biomedical applications

Tejeda

Arámburo

Vargas

et al. 2018

J. Phys. D: Appl. Phys.

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This work reports a novel bifunctional nanocomposite made of infrared-emitting nanophosphors and superparamagnetic nanoparticles, which simultaneously provides heating and temperature sensing at the nanoscale level. Highly luminescent Y3Al5O12:Nd3+ nanophosphors were synthesised by using a sol–gel route and were subsequently mixed with superparamagnetic nanoparticles producing a core–shell structure, which displayed superparamagnetic and fluorescent properties in the same nanostructured system. As a result, this bifunctional nanocomposite showed two essential characteristics: (i) it increased in temperature up to 57 °C upon exposure to an alternating magnetic field of sufficient strength and frequency, and (ii) its temperature could be optically sensed by monitoring the infrared luminescence emitted from the YAG:Nd nanophosphor. Our experiments revealed that the YAG:Nd/Fe3O4@SiO2 nanocomposite possesses excellent luminescence and superparamagnetic properties; both physical properties are driven in a non-contact manner making it appropriate for sensing local heating and temperature of cells, and also suitable to be used in medical treatments with minimal invasiveness.

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Enhanced photoluminescence of Fe3O4@Y2O3:Eu3+ bifunctional nanoparticles by the Gd3+ co-doping

Cited by 17 publications

References 23 publications

Enhancing the Catalytic Activity of Zn-Containing Magnetic Oxides in a Methanol Synthesis: Identifying the Key Factors

Enhancing the Catalytic Activity of Zn-Containing Magnetic Oxides in a Methanol Synthesis: Identifying the Key Factors

Synthesis of Fe₃O₄@Gd₂O₃:Tb³⁺@SiOx multifunctional nanoparticles and their luminescent, magnetic and hyperthermia properties

Novel bifunctional Nd:YAG/Fe₃O₄ nanocomposite as nanothermometer/nanoheater for potential biomedical applications

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Enhanced photoluminescence of Fe3O4@Y2O3:Eu3+ bifunctional nanoparticles by the Gd3+ co-doping

Cited by 17 publications

References 23 publications

Enhancing the Catalytic Activity of Zn-Containing Magnetic Oxides in a Methanol Synthesis: Identifying the Key Factors

Enhancing the Catalytic Activity of Zn-Containing Magnetic Oxides in a Methanol Synthesis: Identifying the Key Factors

Synthesis of Fe3O4@Gd2O3:Tb3+@SiOx multifunctional nanoparticles and their luminescent, magnetic and hyperthermia properties

Novel bifunctional Nd:YAG/Fe3O4 nanocomposite as nanothermometer/nanoheater for potential biomedical applications

Contact Info

Product

Resources

About

Synthesis of Fe₃O₄@Gd₂O₃:Tb³⁺@SiOx multifunctional nanoparticles and their luminescent, magnetic and hyperthermia properties

Novel bifunctional Nd:YAG/Fe₃O₄ nanocomposite as nanothermometer/nanoheater for potential biomedical applications