APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
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2020
·Vol. 126
·期 11
·1-14
·
IF 1.81
Shi Feng,Xiao En-Cai,Chen Guohua,Chen Ying
Non-stoichiometric Nd[Mg 0.5 Sn 0.5(1+ x ) ]O 3 (− 0.04 ≤ x ≤ + 0.04)—type samples were prepared using a traditional two-step solid-state sintering process. Their crystal structures, phase compositions, dielectric properties and lattice vibrational characteristics were identified in detail. The double perovskite Nd(Mg 0.5 Sn 0.5 )O 3 with a monoclinic structure was distinguished as the main crystalline phase, and pure phase was obtained when x < 0. The sample [Nd(Mg 0.5 Sn 0.49 )O 3 ] at x = − 0.02 shows the excellent dielectric properties: ε r = 18.74, Q × f = 47,979 GHz. The lattice vibrational characteristics were clarified with Raman and infrared active mode spectroscopy. The intrinsic properties were fitted by four-parameter semi-quantum model, which show that the low-frequency infrared modes yield a more significant contribution to permittivity and dielectric loss. Raman shifts of modes F 2g (A) and F 2g (B) correlate with dielectric constants negatively, which implies that the bond length has a positive correlation with permittivity. Full widths at half maximum of vibrational modes A 1g (O) correlate with dielectric loss values positively and correlate with the degree of order ( S ) negatively.
研究领域:
材料科学
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物理学
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DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
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2020
·Vol. 22
·期 11
·1-10
·
IF 2.132
Yang Yunjiang,Zhu Xiaowei,Bao Jinrong,Bai He,Wu Anping,Qiao Yan,Bian Yulong,Zhao Xin,Li Wenxian,Liu Ying
In this study, the core/shell/shell-structured SiO 2 /YPO 4 :Nd/SiO 2 composite microspheres with near-infrared luminescence property were prepared by sol-gel method. The morphology and structure of the as-prepared microspheres were observed by transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), and infrared spectroscopy (IR). These tests show that the composite microspheres have a sandwich structure. The diameter of the core SiO 2 microspheres is ~ 220 nm, the intermediate layer thickness of rare-earth phosphate is ~ 5 nm, and the outer SiO 2 layer is ~ 20 nm thick. The core/shell/shell microspheres are emitted at 1063 nm in the near-infrared region, which attributes to optical transparent windows of biological tissues. Meanwhile, the interaction between the composite microspheres and bovine serum albumin (BSA) was investigated. The results showed that the composite microspheres could quench the emission intensity of BSA by binding the tryptophan residues in BSA. The synthesized core/shell/shell composite microspheres may be used as near-infrared luminescence probes in the field of biological tissue imaging.
研究领域:
材料科学
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生物医学工程
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Tao Li,Lili Bo,Xiaolin Guan,Kun Jiang,Yun-Quan Liu,Jinhui Tong
The design of efficient, low-cost, highly active and thermally stable electrocatalysts is critical for both oxygen reduction reactions (ORR) and oxygen evolution reactions (OER). While some spinel metal oxides exhibit good activities for either ORR or OER, a bifunctional spinel metal oxide that can provide decent activities for both ORR and OER would be most desirable. To date, rare earth metal-modified spinel oxides have not been well-studied, but they are thought to be able to boost both ORR and OER simultaneously. Hence, a Nd-doped NiCo 2 O 4 catalyst was synthesized in this work to evaluate its potential for improving both ORR and OER reactions. We hypothesized that this catalyst would be a viable option, as the highly oxidized Co 4+ (hydroxycobalt oxide) generated from surface reconstruction could be an active site for OER while Ni 2+ is intrinsically an active site for ORR. Amazingly, our study revealed that the addition of Nd in spinel metal oxides was able to inhibit the formation of Co 4+ at low potentials while the Ni species promoted the formation of Co 4+ from Co 2+ , thus achieving a balance between Co 2+ and Co 4+ which resulted in a multi-step oxidation process of Co 2+ → Co 3+ → Co 4+ . In addition, by tuning the amount of Nd doped, an optimum electrocatalyst Nd 0.1 Ni 0.9 Co 2 O 4 with excellent activities for both ORR (i.e. the half-wave potential E 1/2 = 0.735 V) and OER (i.e. the overpotential at 10 mA cm −2 E 10 mA·cm −2 = 302 mV) in alkaline conditions was developed. In summary, this work may have opened a new pathway for applying spinel metal oxides as bifunctional catalysts in future commercial ORR and OER processes.
研究领域:
材料科学
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电化学
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产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
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2020
·
IF 3.83
Ting Wang,X.-L. Wang,S.-H. Song,Qing Ma
Multiferroic Nd/Sm-doped BiFeO 3 ceramics synthesized at 700 °C by spark plasma sintering in conjunction with sol-gel precursor powders are investigated by X-ray diffraction, scanning electron microscopy, dielectric , ferroelectric and magnetic measurements. With the doping content of Nd/Sm beyond 10 mol%, the crystal structure changes from R 3 c to coexistence of Pbam and R 3 c . It is also revealed that the grain size for all samples greatly decreases and the dielectric, ferroelectric and magnetic properties are obviously improved with Nd/Sm doping. The optimized remanent polarization are about 1.451 μC/cm 2 and 3.448 μC/cm 2 for the 10 mol% Nd-doped and 15 mol% Sm-doped BiFeO 3 ceramics, respectively. Because of the reduced concentration of oxygen vacancies , the leakage current density of Nd/Sm-doped ceramics decreases more than two orders of magnitude compared to the pure BiFeO 3 sample. The maximum remanent magnetization for the Sm-doped ceramics is approximately 0.279 emu/g, which is higher than that for the Nd-doped samples (0.263 emu/g).
研究领域:
材料科学
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凝聚态物理
·
无机化学
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Zibao Jiao,Zhengjun Yao,Jintang Zhou,Kun Qian,Yiming Lei,Bo Wei,Wenjing Chen
In the present work, novel Ni 0.5 Zn 0.5 Nd 0.04 Fe 1.96 O 4 ferrite (NZNF)/polyaniline (PANI) nanocomposites were prepared by interfacial polymerization. The crystal structure, microstructure and electromagnetic parameters of the samples were investigated in detail, indicating that PANI grew uniformly on the surface of ferrite like coral. By testing the electromagnetic parameters, it was found that PANI significantly improved the real and imaginary parts of the dielectric constant of the samples, thus affecting the impedance matching and attenuation performance. The addition of PANI adversely affected the impedance matching, but had a good effect on attenuation capacity. When the amount of aniline was 25 wt% of the ferrite, the impedance matching and attenuation capacity of the as-prepared NZNF/PANI nanocomposite reached the optimal balance. The NZNF/PANI-25 nanocomposite exhibited a maximum reflection loss of −37.4 dB at 8.4 GHz, and the effective absorption bandwidth was 4.9 GHz at a thickness of 4.0 mm. This novel absorbing material is a promising absorbent with strong and wide band absorption characteristics.
研究领域:
材料科学
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电磁工程
·
纳米技术
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DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2020
·
IF 4.019
Enming Zhao,Xiaodan Liu,Dongyang Tang,Lu Liu,Guangyu Liu,Bao Zhou,Chuanxi Xing
To date, the white light lanthanide upconvertion consisting of RGB components usually originated from more than one type of emitter. Alternatively, Pr 3+ is a fascinating lanthanide ion featuring multiple visible emission bands, including RGB components that in principle enable Pr 3+ to emit white light. In this paper, we report, for the first time to our knowledge, white light upconversion through dual sensitization routes in Nd/Yb/Pr triply doped NaYF 4 microrods upon 800 nm excitation. It is found that the dual sensitization is more efficient than single sensitization for Pr 3+ upconversion. In addition, the temperature sensing behaviors of the proposed triply doped microrods are comparatively investigated using different emission bands. This work presents a novel white light emitting material upon 800 nm excitation, and further demonstrates the feasibility of multichannel thermometry using the proposed material.
研究领域:
材料科学
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光学
·
纳米技术
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DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2020
·
IF 3.232
Hongqi Chen,Wen Wang,Changchun Ji,Lun Wang
The core–shell NaGdF 4 :Yb,Er@NaGdF 4 :Yb,Nd upconversion nanoparticles (UCNPs) were successfully obtained with the method of co-precipitation, and the water-solubility of UCNPs was improved by the ligand exchange reaction between nitrosyl tetrafluoroborate (NOBF 4 ) and nanoparticles. The IR-783 dye with negative charge and NOBF 4 -UCNPs with positive charge can bind together by electrostatic action to sensitize UCNPs through the energy transfer from IR-783 to UCNPs. However, with the presence of Na 2 S (a commonly used H 2 S donor), a highly selective reaction between H 2 S and IR-783, which destoried the structure of IR-783 and blocked the energy transfer, thus led to the quenching of luminescent intensity. Based on this, a sensing system for determination of H 2 S has been constructed successfully. The linear range of H 2 S detection by this system is 0.5–15 μM, and the detection limit is 34.17 nM. Furthermore, the dye-sensitized core–shell NaGdF 4 :Yb,Er@NaGdF 4 :Yb,Nd upconversion nanoprobe was applied to real sample analysis with satisfactory results.
研究领域:
分析化学
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纳米技术
·
材料科学
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产品关联
DOI
PubMed
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2025
·
IF 4.7
Shanshan Wang,Haotong Wang,Benteng Ma,Bingxin Zhu,Yusheng Yang,Min Qiu,Milin Zhang
The Nd–Ni intermetallic compounds have been used as a hydrogen storage material due to their high hydrogen storage capacity. Eight Nd–Ni intermetallic compounds have been identified, and the optimal alloy composition needs to be prepared for controllable material properties. In this work, the Nd–Ni intermetallic coatings were prepared by electrolysis in molten LiCl–KCl, and the neodymium activity in these intermetallics was measured. The electrochemical behavior of Nd(III) ions was investigated on the inert W electrode and active Ni electrode, respectively. The reduction process of Nd(III) ions was two-step and controlled by diffusion on a W electrode. Meanwhile, we found that Nd(II) ions affected the accurate evaluation of the diffusion coefficient because of the disproportionation reaction Nd(II)↔Nd(III) + Nd(0). The formation mechanism of Nd–Ni intermetallic coatings was resolved using a combination of electrochemical and EDS methods. Five Nd–Ni intermetallic NdNi 5 , Nd 2 Ni 7 , NdNi 3 , NdNi 2 , and NdNi coatings were successfully prepared by potentiostatic electrolysis. The activity and activity coefficient of neodymium in these intermetallic compounds were obtained. The relationship between the formation potential of Nd–Ni intermetallic compounds and the neodymium activity was established.
研究领域:
材料科学
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电化学
·
物理化学
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DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 68
·38850-38859
·
IF 2.936
Yaozu Guo,Dong Zhao,Junhua You,Wenli Pei,Yingdong Qu,Xiaoyang Wang,Qingyu Meng
Nd2Fe14B nanoparticles were successfully prepared by using a low-energy chemical method. The microscopic characteristics and formation mechanisms of the phases were investigated at each stage during the preparation of Nd-Fe-B nanoparticles. The Nd-Fe-B intermediates, Nd-Fe-B oxides and reduced Nd-Fe-B nanoparticles were detected and analyzed by using TEM, STEM, XRD, SEM, VSM and Rietveld calculations. The results showed that the intermediate of Nd-Fe-B consisted of Fe3O4 and Nd and Fe elements surrounded by nitrile organic compounds. The Nd-Fe-B oxide was composed of NdFeO3 (48.619 wt%), NdBO3 (31.480 wt%) and α-Fe (19.901 wt%), which was formed by the reaction among Nd, Fe3O4 and B2O3. NdFeO3 and NdBO3 exhibited a perovskite-like lamellar structure, and the grain size was smaller than that of α-Fe. Nd-Fe-B particles were mainly composed of Nd2Fe14B and α-Fe phases. The small particles of NdFeO3 and NdBO3 and the interstitial position between oxide particles and α-Fe were more favorable for the formation of Nd2Fe14B particles. At the same time, the surface of α-Fe particles can also diffuse to form Nd2Fe14B nanoparticles. The coercivity of Nd-Fe-B particles was 5.79 kOe and the saturation magnetization was 63.135 emu g−1.
研究领域:
材料科学
·
纳米材料
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磁性材料
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无机非金属材料
·
固体化学
✓ 已验证
DOI
高影响因子
MATERIALS & DESIGN
·
2023
·
IF 8.4
Yanbang Lian,Congcong Wang,Yu Meng,Junqiang Dong,Jianbin Zhang,Gongxun Bai,Jianbo Gao
Rational design and preparation of multifunctional low dimensional nanomaterials are of great importance for in vivo imaging and safety therapy. Meanwhile, nanomaterials with good bio-compatible and effectively photothermal conversion are still demanded to be fabricated in biomedicine. In this work, we have developed two-dimensional bismuth selenide nanosheets as the imaging and photothermal nanoagents. Through doping engineering, the near infrared photothermal conversion of Nd doped nanosheets was boosted by 52 %, which is higher than many previous works. Besides, the prepared nanomaterials can realize infrared and in vivo computed X-ray tomography bioimaging, due to the rich optical-magnetic properties of Nd atoms. The in vitro and vivo experiments with mice display that the Nd doped nanosheets have low toxicity and high biocompatibility. More importantly, the nanomaterials can efficiently achieve photothermal tumor ablation. It is suggested that designed and developed nanosheets have promising applications for biomedicine.
研究领域:
纳米技术
·
生物医学工程
·
材料科学
·
癌症治疗
·
成像技术
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产品关联
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2025
·
IF 4.8
Shuai Hu,Xiaoxuan Zhu,Yan Zhu,Chenliang Zhou,Gewen Yu,Yanming Wang,Cong Wang,Zhenfeng Wang,Jian Ding,Yuqing Wang,Xiaohui Guo
To enhance the activity and selectivity of Cu-based catalysts in the CO 2 hydrogenation reaction, this study systematically investigated the regulation effect of Nd-doping on the structure and surface properties of different oxide support (MgO, Al 2 O 3 , ZrO 2 , and CeO 2 ), and further explored its influence on the state of Cu species as well as the catalytic performance in CO 2 hydrogenation to methanol. The results show that the introduction of Nd 3 + can effectively induce lattice distortion of the support which promotes the generation of oxygen vacancies and the formation of surface basic sites, thereby enhancing the interfacial electronic interaction between Cu and support and improving the stability of Cu + active centers. Among them, the Cu catalyst supported on Nd-doped ZrO 2 exhibited the best catalytic performance such as the high CO 2 conversion and selectivity to methanol. Various characterization (XRD, SEM, in-situ XPS, H 2 -TPR, CO 2 -TPD, and H 2 -TPD) results confirmed the key role of Nd-doping in regulating the oxygen defects, electronic structure, and Cu species distribution over support. This study reveals the structural regulation mechanism of Nd in constructing efficient Cu-based catalysts for CO 2 hydrogenation from the perspective of support engineering, providing theoretical basis and practical guidance for the design of new high-performance catalytic materials.
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DOI
高影响因子
SOLID STATE IONICS
·
2021
·
IF 3.785
Yongxin Zhang,Zhiyong Huang,Tian Gan,Nianjun Hou,Lijun Fan,Xin Zhou,Ge Gao,Jingyu Li,Yicheng Zhao,Yongdan Li
Cu Ce 0.8 La 0.1 Sm 0.1 O 2-δ and Cu Ce 0.8 Nd 0.1 Sm 0.1 O 2-δ are studied as anode materials for solid oxide fuel cells with methanol as fuel. The oxygen surface exchange and bulk diffusion coefficients of Ce 0.8 Sm 0.2 O 2-δ both increase with La and Nd doping. The CH 3 OH temperature-programmed surface reaction results show that the addition of La and Nd accelerates the chemical oxidation of CH 3 OH. Furthermore, compared with Cu Ce 0.8 Sm 0.2 O 2-δ , the anodes with La and Nd show higher resistance to coking in CH 3 OH atmosphere. The Cu-based cermet anode exhibits a low catalytic activity for the electrochemical oxidation of H 2 , and a single cell supported by a Ce 0.8 Sm 0.2 O 2-δ ‑carbonate composite electrolyte with Cu Ce 0.8 Sm 0.2 O 2-δ anode exhibits a maximum power density of 160 mW cm −2 at 650 °C using dry hydrogen as fuel. However, the maximum power density reaches 550 mW cm −2 when CH 3 OH is used as fuel, and further increases to 730 and 830 mW cm −2 with the addition of La and Nd in the anode, respectively. The results indicate that with the promotion of the oxygen activity, the Cu-based cermet is a promising anode material for solid oxide fuel cells using CH 3 OH as fuel.
研究领域:
材料科学
·
燃料电池研究
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DOI
高影响因子
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