DALTON TRANSACTIONS
·
2015
·Vol. 45
·期 4
·1708-1716
·
IF 4.197
Fei He,Chunxia Li,Xinyang Zhang,Yinyin Chen,Xiaoran Deng,Bei Liu,Zhiyao Hou,Shanshan Huang,Dayong Jin,Jun Lin
808 nm excited upconversion nanoparticles (UCNPs) have received extensive attention in the biomedical areas. However, one of the limitations of UCNPs is their lower luminescence efficiency. Aimed at this problem, a series of BaGdF5-based UCNPs were prepared by a layer-by-layer procedure. And UC luminescence properties are optimized by varying the doping concentration of rare earth ions, amount and types of shells. It is found that if the amount of core BaGdF5:20%Yb3+/2%Er3+ was fixed at 0.5 mmol, the optimized conditions of three shell layers are 0.3 mmol of BaGdF5:10%Yb3+, 0.5 mmol of BaNdF5 and 0.5 mmol of BaGdF5. Thus the UC luminescence intensity of the resultant nanoparticles BaGdF5:20%Yb3+/2%Er3+@BaGdF5:10%Yb3+@BaNdF5@BaGdF5 (Er@Yb@Nd@Gd) is enhanced more than four times compared with that of BaGdF5:20%Yb3+/2%Er3+@BaGdF5:10%Yb3+@BaNdF5 (Er@Yb@Nd). To further improve the biocompatibility and applications in the biological field, carboxymethyl chitosan (CMC), a type of biocompatible water-transfer agent, was used as a capping ligand to modify the surface of Er@Yb@Nd@Gd. An antitumor drug doxorubicin (DOX) was loaded to the CMC-modified Er@Yb@Nd@Gd nanocarriers by electrostatic interactions. The DOX can be selectively released in an acidic environment, which shows a pH-triggered drug release behavior. On the other hand, Er@Yb@Nd@Gd nanoparticles have excellent magnetic properties due to the presence of Gd components. T1-weighted magnetic resonance imaging (MRI) reveals the concentration-dependent brightening effect with longitudinal relaxivity (r1) as high as 43.77 s−1 (mM)−1, much higher than that of previous Gd3+-based counterparts. The results indicate that this multifunctional drug delivery system is expected to be a promising platform for simultaneous cancer therapy and bioimaging.
研究领域:
生物医学
·
材料科学
·
药学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF LUMINESCENCE
·
2021
·
IF 3.599
Lei Yu,Kuibao Zhang,Weiwei Li,Baozhu Luo
In this study, Sm-doped Gd 2 Zr 2 O 7 transparent ceramics were successfully prepared by high temperature vacuum sintering using combustion synthesized nanopowders . X-ray diffraction, solid ultraviolet absorption spectrophotometer and fluorescence spectrometer were employed to investigate the structural evolution and photoluminescence properties of as-prepared samples. The Sm-doped Gd 2 Zr 2 O 7 nanopowders are in defective fluorite structure, which transforms into pyrochlore structure after high temperature sintering . The 3% Sm-doped sample exhibits high in-line transmittance of 74.7% at the wavelength of 1000 nm. The fluorescence lifetimes of all samples excited at 404 nm and detected at 615 nm are in millisecond scale, and the concentration quenching occurs when the Sm doping concentration reaches to 10%.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Nuclear Materials and Energy
·
2020
·
IF 2.213
Xinyi Yang,Liangliang Song,Bo Chang,Qi Yang,Xiaodong Mao,Qunying Huang
The low solubility of gadolinium (Gd) limits its application in iron-based neutron shielding alloys. In this study, a high content of Gd up to 7.87 wt.% was added into 316L stainless steel by mechanical alloying (MA) of Gd 2 O 3 with 316L powder. Neutronics calculation results showed that the shielding efficiency of 0.2 mm thick 7.87 wt.% Gd-316L alloy was equivalent to that of 33 mm thick 316L for thermal neutrons. Microstructure analysis indicated that Gd-Si-O particles with an average size of 12.5 nm were uniformly dispersed in the matrix. It revealed that Gd 2 O 3 dissolved into the 316L matrix during MA and re-precipitated at around 780 °C as Gd 2 SiO 5 by XRD and TG-DSC. This study provides a novel Gd-containing alloy designed to achieve integration of structural alloys with good neutron shielding function for future application.
研究领域:
材料科学
·
核工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Zhenyu Xu,Han Liu,Weiping Zhou,Wanchun Yu,Guoqiang Xiao,Di Lu,Fei Gao,Zhenzhi Cheng,Guangsheng Luo
In this study, the impact of Gd 3+ doping on the structural, magnetic and dielectric properties of BaSrCo 2 (Fe 1- x Gd x ) 11 AlO 22 ( x = 0, 0.02, 0.04, 0.06, 0.08, 0.1) ferrite ceramics synthesized by the conventional solid-state reaction method are investigated. XRD results reveal that all the samples crystallize in the R 3 ‾ m space group. With the increase of Gd content, the formation of M-type phase is effectively inhibited due to Gd 3+ ions may change the activation energy of nucleation of the grains and the formation energy of hexaferrite. SEM analysis confirms the presence of hexagonal grains in samples with homogeneous elements distribution. The XPS results verify the coexistence of ferric and ferrous ions in the ceramics. The magnetization and coercivity are suppressed by Gd 3+ substitution. The permeability increases firstly and then decreases with the substitution of Gd ions. While the dielectric constant increases with the substitution of Gd. The real and imaginary parts of the dielectric constant in the frequency range of 2–18 GHz change slightly with doping amounts variation, and all the samples exhibit prominent peaks at about 14 GHz due to natural resonance.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Chemistry
·
2022
·
IF 13.599
Xingyu Pu,Jiabao Yang,Tong Wang,Shuaici Cheng,Qi Cao,Junsong Zhao,Hui Chen,Yixin Zhang,Tingting Xu,Ilhom Tojiboyev,Hadi Salari,Xuanhua Li
All-inorganic CsPbI 2 Br perovskite solar cells (PSCs) have received extensive research interests recently. Nevertheless, their low efficiency and poor long-term stability are still obstacles for further commercial application. Herein, we demonstrate that high efficiency and exceptional long-term stability are realized by incorporating gadolinium(III) chloride (GdCl 3 ) into the CsPbI 2 Br perovskite film. The incorporation of GdCl 3 enhances the Goldschmidt tolerance factor of CsPbI 2 Br perovskite, yielding a dense perovskite film with small grains, thus the α-phase CsPbI 2 Br is remarkably stabilized. Additionally, it is found that the GdCl 3 -incorporated perovskite film achieves suppressed charge recombination and appropriate energy level alignment compared with the pristine CsPbI 2 Br film. The noticeable increment in efficiency from 14.01% (control PSC) to 16.24% is achieved for GdCl 3 -incorporated PSC. Moreover, the nonencapsulated GdCl 3 -incorporated PSC exhibits excellent environmental and thermal stability, remaining over 91% or 90% of the original efficiency after 1200 h aging at 40% relative humidity or 480 h heating at 85 °C in nitrogen glove box respectively. The encapsulated GdCl 3 -incorporated PSC presents an improved operational stability with over 88% of initial efficiency under maximum power point (MPP) tracking at 45 °C for 1000 h. This work presents an effective ion-incorporation approach for boosting efficiency and long-term stability of all-inorganic PSCs.
研究领域:
材料科学
·
能源研究
✓ 已验证
DOI
高影响因子
NANOTECHNOLOGY
·
2018
·Vol. 30
·期 7
·075101
·
IF 3.404
Hongying Guo,Xiaoshuang Zhao,Hongmei Sun,Hongda Zhu,Honghao Sun
Development of a safe, efficient and inexpensive multifunctional nanoplatform using a facile approach for multimodal imaging and therapeutic functions becomes more and more practically relevant but challenging. In this work, we demonstrated a novel nanocomposites (Bi2S3-Gd) for computed tomography (CT)/magnetic resonance (MR) imaging-guided photothermal therapy (PTT) for cancer in vitro. It was achieved by modification of hydrophobic Bi2S3 with a smart amphiphilic gadolinium-chelated ligand. The as-prepared nanocomposites composed of low-cost Bi2S3 and gadolinium complexes, showed high stability, excellent biocompatibility and good photostability. It was observed that Bi2S3-Gd nanocomposites can efficiently convert the NIR light into heat, and then suppressed the growth of tumor cells under NIR laser irradiation. Apart from serving as an effective photothermal agent, the as-prepared nanomaterials could induce an efficient contrast enhancement for both CT and MR imaging at low concentrations of Bi and Gd, rendering more accurate diagnosis. This work suggests the potential of Bi2S3-Gd nanomaterials as a novel multifunctional nanoplatform for CT/MR imaging-guided PTT for cancer.
研究领域:
医学影像学
·
纳米医学
·
肿瘤学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 12
·9612-9618
·
IF 3.289
Ming Chen,Jia-Hong Wang,Zhi-Jun Luo,Zi-Qiang Cheng,Ya-Fang Zhang,Xue-Feng Yu,Li Zhou,Qu-Quan Wang
Metal/rare-earth core/shell hetero-nanostructures combine the optical properties of metal cores and rare-earth shells, which are widely reported and expected to be used in multitask applications. However, there is still no facile and efficient strategy to directly prepare such materials. Herein, we present a facile hydrothermal method for directly coating rare-earth vanadate shells onto the Au nanoparticle (AuNP) cores. Citrate plays a fascinating and critical role in the whole synthesis process, and not only acts as the capping agent to stabilize the as-prepared AuNP cores and the final products but also serves as the complexing agent to assist the nucleation and growth of rare-earth vanadate shells. Interestingly, the grown Au/GdVO4:Eu core/shell NPs have a flower-like shape with tunable plasmon resonance and bright fluorescence. The morphology and crystallinity as well as the growth mechanism and tunable optical properties of the Au/GdVO4:Eu are investigated. The method developed here could be extended for preparing other metal/rare-earth hybrids and the multifunctional products with specific morphology have the potential in the photocatalytic and biomedical application.
研究领域:
材料科学
·
纳米技术
·
光学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2020
·
IF 2.726
Fenglan Liang,Liang Qin,Jingrong Xu,Shumei Li,Chumin Luo,Huan Huang,Deyun Ma,Zhi Li,Jun Xu
A water-stable 3D porous Gd-based MOF decorated by hydroxyl groups with irl topology, {[Gd 2 (OH-BDC) 2 (DMF) 2 (H 2 O) 2 ]∙(H 2 O)} n ( 1 ) (OH–H 2 BDC = 2,5-dihydroxyterephthalic acid, DMF = dimethylformamide) has been prepared and were structurally characterized. The results of TGA and PXRD revealed that 1 shows high thermal stability up to 350 °C and good water stability. 1 exhibits a 3D framework with 1D channel of 8.4 × 8.1 Å 2 parallel to the c axis. Activated 1 ( 1a ) shows an 5-Fluorouracil payload of 23.2 wt% and higher signal enhancement ability than Gd-DTPA with the r 1 value being 31.20 mM −1 S −1 . Meanwhile, 1a exhibits selective CO 2 uptake compare with CH 4 , N 2 , O 2 , and H 2 at room temperature under simulation condition. Furthermore, the magnetic property , in vitro MTT assays and in vivo Zebrafish toxicity tests of 1 have also been carried out.
研究领域:
材料科学
·
医学
·
化学
✓ 已验证
DOI
高影响因子
Functional Materials Letters
·
2023
·
IF 1.3
Chaoqian Qin,Jinghong Du,Jiaxing Chen,Jiarui Yang,Shengyang He
Titanium dioxide nanotube arrays doped with Mo 6 + , Gd 3 + , and Mo 6 + - Gd 3 + were prepared by anodic oxidation combined with a two-step electrochemical method. The crystalline structure, surface morphology, light absorption properties, and crystalline transformation process were characterized using XRD, SEM, UV–Vis, DSC, and FT-IR. The results show that Mo 6 + and Gd 3 + single doping of TiO 2 can promote the transformation of amorphous TiO 2 to anatase and inhibit the transformation of anatase phase to rutile, but Mo 6 + – Gd 3 + co-doping promotes both phase transformations, and the anatase compositions of the TiO 2 heat-treated at 450 ∘ C were all over 91%; The tube diameters of TiO 2 nanotubes were all around 60–70 nm; the Mo 6 + - and Gd 3 + -doped TiO 2 light absorption peaks were all significantly red-shifted, with the most obvious change in the Mo 6 + – Gd 3 + co-doping, where the forbidden bandwidth was reduced to 3.01 eV; The degradation rate of pure TiO 2 photocatalytic degradation of methylene blue for 8 h was only 41.9%, while the degradation rate of Mo 6 + – Gd 3 + co-doped TiO 2 was as high as 91.51%; Mo 6 + , Gd 3 + , single doping and co-doping could increase the amount of •OH, •OOH adsorbed on the surface of TiO 2 , which led to the improvement of catalytic performance.
研究领域:
材料科学
·
纳米技术
·
环境科学
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2021
·
IF 8.198
Yibo Wang,Shuai Hou,Rongpeng Ma,Jiadong Jiang,Zhaoping Shi,Changpeng Liu,Junjie Ge,Wei Xing
Simultaneously improving the activity and long-term stability of the oxygen evolution electrocatalysts in acidic media is an ever ongoing process for the water electrolysis technique. Here, we report a novel Gd-doped porous IrO2 (Gd-pIrO2) catalyst with a high specific surface at 293 m2 g–1 and enhanced catalytic activity toward oxygen evolution reaction (OER), where the overpotential required to reach 10 mA cm–2 is only 287 mV. We found that Gd3+ doping induces the formation of abundant oxygen vacancies and an increase in Ir4+/Ir3+ ratio, due to the charge compensating mechanism in defect chemistry. Combining experimental techniques and density functional theory calculations, we revealed that Gd doping at an appropriate content leads to an overall enhancement in OER performance, where oxygen vacancies facilitate the adsorption of water molecules and the high ratio of Ir4+/Ir3+ facilitates the H dissociation. The novel strategy proposed in this study provides an efficient way for designing high-performance electrocatalysts for water electrolysis.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2019
·Vol. 103
·期 2
·809-818
·
IF 3.094
Zhigang Sun,Ziyun Chen,Mengyao Wang,Bin Lu
We first report the novel Ce 3+ -activated and Lu 3+ -stabilized gadolinium aluminate garnet (GAG) transparent ceramics derived from their precipitation precursors via a facile co-precipitation strategy using ammonium hydrogen carbonate (AHC) as the precipitant. The resulting precursors in liquid phase were substantially homogeneous solid solutions and could directly convert into sinterable garnet powders via pyrolysis. Substituting 35 at.% of Lu 3+ for Gd 3+ was effective to stabilize the cubic GAG garnet structure and transparent (Gd,Lu) 3 Al 5 O 12 :Ce ceramics were successfully fabricated by vacuum sintering at 1715°C. The ceramic transparency was improved by optimizing the particle processing conditions and the best sample had an in-line transmittance of ~70% at 580 nm (Ce 3+ emission center) and over 80% in partial infrared region with a fine average grain size of ~4.5 μm. Transparent (Gd,Lu) 3 Al 5 O 12 :Ce ceramics have a short critical wavelength (<200 nm) and a maximal infrared cut-off at ~6.6 μm. Both the (Gd,Lu) 3 Al 5 O 12 :Ce phosphor powder and the transparent ceramic exhibited characteristic yellow emission of Ce 3+ with strong broad emission bands from 490 to 750 nm upon UV excitation into two groups of broad bands around 340 and 470 nm. The photoluminescence and photoluminescence excitation intensities as well as the quantum yield were greatly enhanced via high-temperature densification. Both the phosphor powder and ceramic bulk had short effective fluorescence lifetimes.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2014
·Vol. 16
·期 2
·1-10
·
IF 2.278
Du Weimin,Zhang Youjuan,Wang Yanbin,Liu Junning,Lu Haiyang,Hou Suhan,Zhang Xiaohua
Abstract Zirconia modified by gadolinium (Gd/ZrO 2 ) nanocomposite has been successfully prepared by NaCl-assisted method. The effects of gadolinium introduction on phase, composition, optical properties, and photocatalytic activities were investigated in detail. Results reveal that the introduction of gadolinium could enlarge the lattice space, create structural defects, and restrict the product growth. At the same time, the generated structural defects further influence the optical properties of Gd/ZrO 2 nanocomposite with single phase. Photocatalytic experiments indicate that Gd 0.2 Zr 0.8 O 2− δ
nanocrystals have better visible-light-responsive photocatalytic activities which results from the special structural defect, smaller size (30–55 nm), and larger specific surface area (~50.60 m 2 /g). Hence, Gd 0.2 Zr 0.8 O 2− δ
nanocrystals are promising visible-light-responsive photocatalysts with potential prospects in wastewater treatment and environmental protection. Also, the present NaCl-assisted method might be generalized to synthesize other nanocomposite with more complicated structures. Graphical Abstract
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）