Journal of Materiomics
·
2021
·
IF 6.425
Jing Chen,Nan Su,Xiao Li Zhu,Xiao Qiang Liu,Jin-Xing Zhang,Xiang Ming Chen
BiFeO 3 has been recognized as one of the most important room-temperature single-phase multiferroic materials, but it still suffers from several drawbacks especially the weak magnetoelectric coupling. In the present work, the electric-field-controlled magnetism is achieved in Bi 1-x Gd x FeO 3 system, which involves a field-induced transition of Pna 2 1 / R 3 c at the morphotropic phase boundary region, and the magnetic state is switched between cycloidal state and canted antiferromagnetic state. The electric-field-controlled magnetism becomes reversible with the help of annealing, which is confirmed by magnetic hysteresis loops and the quantitative ratio of the involved phases for the as-sintered, as-poled and as-annealed samples. Compared with the systems of Bi 1-x Nd x FeO 3 and Bi 1-x Sm x FeO 3 , it is easier to tune the symmetry from R 3 c to Pna 2 1 with lower rare earth-content, and the field-induced transition is more apparent and subsequently leads to more significant electric-field-controlled magnetism in a wider composition range.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
Journal of Biomedical Nanotechnology
·
2018
·Vol. 14
·期 6
·1117-1124
·
IF 5.068
Hu Meixin,Qi Jianrong,Ruan Jing,Shen Guangxia
Carbon dots, as a potential substitute for semiconductor quantum dots, have drawn great interest in recent years. The preparation of fluorescent carbon dots has been made easy with many significant advances, but the complicated purifying processes, low quantum yield, and blue emission
wavelength still limit its wider application in biosensors, biomedicine, and photonic devices. Here we report a strategy to synthesis Gd-doped carbon dots (Gd-Cdots) of super-high quantum yield with a microwave assisted hydrothermal method. The Gd-Cdots, with a diameter of 47∼8 nm, can
be purified easily with conventional centrifugal techniques. Carbon microparticles (CMPs) have also been synthesized with a similar procedure. Meanwhile, we demonstrated a novel "turn-off-on" fluorescent biosensor, which has been developed for highly sensitive detection of glucose using Gd-doped
carbon dots as probes. The proposed biosensor has exhibited low-cost and non-toxic properties, with high sensitivity and good specificity. In addition, the results in real blood samples further confirmed it as a promising application in diabetes diagnosis.
研究领域:
生物传感
·
医学诊断
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Research Express
·
2019
·Vol. 6
·期 11
·115554
·
IF 1.449
Tao Wang,Xiaoou Sun,Duanting Yan,Guodong Zhang,Dejun Wang,Jing Leng,Runru Liu
In this work, the effect of grain size and uniformity of the precursor powder on the electrical property of ceria based electrolytes was investigated. Gadolinia-doped ceria (GDC) samples were treated under different calcination temperatures (600 °C and 1300 °C), where their grain size and uniformity were adjusted by varying the ratio of 1300 °C powder in precursors. The phase composition, morphology and conductivities of mixed GDC samples were characterized by x-ray diffraction (XRD), scanning electron spectroscopy (SEM) and AC impedance, respectively. XRD results revealed that all GDC samples are single cubic fluorite-type structures. As the content of 1300 °C powder increased, the grain boundary conductivity first dropped markedly to the minimum at the ratio x = 5% and then basically unchanged, whereas no significant change was observed in bulk conductivity. Our study demonstrated that the ratio of the higher calcination temperature powder in the mixed precursor powder gave rise to the variation of grain size uniformity and the electrical properties of GDC samples.
研究领域:
材料科学
·
固态离子学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 18
·9611-9617
·
IF 2.936
Ji-Wei Shen,Zhiqing Wang,Xiaoxuan Wei,Jiawei Liu,Yinmao Wei
Herein, user-friendly control of the synthesis of sub-10 nm hexagonal (β-) NaYbF4:Er nanocrystals (NCs) with extremely low-level Gd3+ doping (0%, 10 mol%) was achieved. We reveal for the first time that the effective sodium/fluoride levels during the formation of cubic (α-) nuclei are not only controlled by the sodium/fluoride to rare-earth precursor ratios used, but also sensitively restricted by the in situ NaF generation reaction in a sodium oleate-based solvothermal system. Excessive in situ NaF generation will lead to a respective sodium- and fluoride-deficient environment, delayed α-to-β transition and larger β-NCs. Based on these effects, sub-10 nm monodisperse low-level Gd3+-doped β-NaYbF4:Er was obtained with a user-friendly low fluoride dosage by finely balancing this NaF generation reaction and achieving an intrinsic optimized sodium-fluoride level for NC nucleation. Notably, our work represents the first example where the focus is on the competing in situ NaF generation reaction and its use for nucleation regulation, as well as for the user-friendly control of the solvothermal synthesis of sub-10 nm β-NaYbF4:Er.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
PubMed
高影响因子
BIOMACROMOLECULES
·
2012
·
IF 5.479
Zhenhua Li,Zhen Liu,Meili Yin,Xinjian Yang,Qinghai Yuan,Jinsong Ren,Xiaogang Qu
A novel cancer-cells-triggered controlled-release gadolinium-doped luminescent and mesoporous strontium hydroxyapatite nanorods (designated as Gd:SrHap nanorods) system using cell-type-specific aptamers as caps has been constructed. Aptamers behave as a dual-functional molecule that acts as not only a lid but also a targeted molecular that can be used in an effective way for therapeutically special cancer cells. After incubated with cancer cells, for example, MCF-7 cells, the doxorubicin-loaded and aptamer-capped Gd:SrHap nanorods (designated as Gd:SrHap-Dox-aptamer) can be internalized into MCF-7 cells, resulting in the pore opening and drug releasing. Furthermore, the high biocompatibility and biodegradability Gd:SrHap nanorods with blue autofluorescence and paramagnetism could serve as a good contrast agent of targeting fluorescence and magnetic resonance imaging. We envision that this Gd:SrHap system could play a significant role in developing new generations of site-selective, controlled-release delivery and interactive sensory nanodevices.
研究领域:
生物医学工程
·
纳米医学
·
分子生物学
✓ 已验证
产品关联
DOI
PubMed
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
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
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 Materials Chemistry B
·
2016
·Vol. 5
·期 1
·92-101
·
IF 4.872
Yi Pan,Jun Yang,Yaning Fang,Junhui Zheng,Rong Song,Changqing Yi
In this study, an efficient and mild approach is reported for the facile synthesis of a carbon quantum dot (CQD)-based dual-modal fluorescence (FL)/magnetic resonance (MR) imaging probe by doping Gd(III) into CQDs through a one-pot pyrolysis process at low temperature. The as-prepared Gd-encapsulated CQDs (GCDs), which have an average diameter of ∼15 nm, are highly water-soluble. The GCDs are observed to have a high MR response with a longitudinal relaxation of 57.42 mM−1 s−1 and a strong fluorescence brightness with an absolute quantum yield of 40% while containing only 1.0% (w/w) of Gd3+ content. Stemming from the minimum Gd-doping and the inert carbon coating, GCDs exhibit excellent biocompatibility and blood compatibility. Dual-modality bioimaging applications of GCDs are successfully demonstrated by the use of HeLa cells and mice as models, revealing their great potential in fundamental biomedical research studies and even clinical fields such as fluorescence-guided surgery and dual-modal FL/MR imaging of blood vessels.
研究领域:
生物医学工程
·
材料科学
·
医学影像学
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Dewang Zeng,Fengwen Kang,Yu Qiu,Dongxu Cui,Min Li,Li Ma,Shuai Zhang,Rui Xiao
Supporting materials are often employed to enhance the stability of iron oxides oxygen carriers, but the reactivity is compromised for the dilution of the active phase. Here, we report several iron oxides supported by ionic conducting gadolinium-doped cerium oxides (GDC) for efficient chemical looping hydrogen production. The results show that GDC support can simultaneously improve redox stability and activity. Specifically, the produced Fe 2 O 3 /Gd 0.3 Ce 0.7 O 3−δ exhibits a high hydrogen production rate of ~0.71 mmol·g −1 ·min −1 and hydrogen yield of ~10 mmol·g −1 with negligible decay through 20 redox cycle. When using methane as the reducing agent, Fe 2 O 3 /Gd 0.3 Ce 0.7 O 3−δ shows high methane conversion of 75.67% and much lower carbon deposition than Fe 2 O 3 . The high performance is attributed to the improved oxide ion-conductivity through the oxygen carrier, which is further verified as the ability of the GDC support to accelerate the oxygen diffusion in the bulk. The explored support effects in this work can be extended to design oxygen carrier materials with both high activity and stability.
研究领域:
材料科学
·
能源化学
·
催化化学
·
无机化学
·
清洁能源技术
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Yi-Bing Zhang,Jin Wang,Jun-Xia Wang,Yi Huang,Ping Luo,Xiao-Feng Liang,Hong-Bin Tan
In order to ascertain the structural relationship of zirconolite and pyrochlore for their potential application in HLW immobilization, the Gd-doped zirconolite-pyrochlore composite ceramics (Ca 1- x Zr 1- x Gd 2 x Ti 2 O 7 ) were systematically synthesized with x = 0.0–1.0 by traditional solid-phase reaction method. The phase evolution and microstructure of the as-prepared samples have been elucidated by XRD and Rietveld refinement , Raman spectroscopy , BSE-EDS and HRTEM analysis. The results showed that zirconolite-2M, zirconolite-4M, perovskite and pyrochlore, four phases were identified in Ca 1- x Zr 1- x Gd 2 x Ti 2 O 7 system and could be coexisted at x = 0.4 composition. With the increase of Gd 3+ substitution, the phase evolution was followed by zirconolite-2M→zirconolite-4M→pyrochlore. It is illustrated that the phase transformation from zirconolite-2M to zirconolite-4M was promoted by the preferential substitution of Gd 3+ for Ca 2+ . And the solubility of Gd 3+ in zirconolite-2M, zirconolite-4M and pyrochlore increased in sequence. The chemical stability test was also measured by the PCT leaching method. The normalized elemental release rates of Ca, Zr, Ti and Gd in Ca 1- x Zr 1- x Gd 2 x Ti 2 O 7 system were fairly low and in the range of 10 −6 −10 −8 g m −2 d −1 , which indicated a potential ceramics composite ensemble of CaZrTi 2 O 7 -Gd 2 Ti 2 O 7 system for nuclear HLW immobilization.
研究领域:
材料科学
·
核能工程
·
化学
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2016
·
IF 4.035
Chunli Jiang,Zhitao Shen,Chunhua Luo,Hechun Lin,Rong Huang,Yiting Wang,Hui Peng
A facile one-pot strategy has been developed for the aqueous synthesis of Gd doped CdTe (Gd:CdTe) QDs as fluorescence and magnetic resonance imaging dual-modal agent. The prepared Gd:CdTe QDs showed narrow size distribution and the average size was less than 5 nm. The amount of Gd 3+ dopant in Gd:CdTe QDs significantly affected the optical properties of obtained QDs. The highest PL QY for the prepared Gd:CdTe QDs was up to 42.5%. The QDs showed the weak toxicity and significant enhancement in MRI signal. The specific relaxivity value ( r1 ) was determined to be 4.22 mM −1 s −1 . These properties make the prepared Gd:CdTe QDs be an effective dual-modal imaging agent and have great potential applications in biomedical field.
研究领域:
材料科学
·
医学影像
·
纳米生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）