Materials
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2022
·Vol. 15
·期 19
·6953
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IF 3.748
Yaohui Xu,Pingkeng Wu,Mingjin Wu,Yuehe Gu,Hongguang Yu,Zhao Ding
Pr-doped CeO2with different doping levels was prepared from Ce(NO3)3∙6H2O and Pr(NO3)3∙6H2O by solvothermal method without any additional reagents, in which the mixed solution of ethylene glycol and distilled water was employed as a solvent. The influences of Pr-doping on phase composition, crystal structure and morphology were investigated, as well as Pr valence and oxygen vacancy defects. The Pr cations entered into the CeO2crystal lattice with normal trivalence and formed a Pr-CeO2solid solution based on the fluorite structure. The larger trivalent Pr was substituted for tetravalent Ce in the CeO2crystal and compensated by oxygen vacancy defects, which caused the local lattice expansion of the crystal lattice. Moreover, the Pr-doped CeO2solid solutions exhibited visible color variation from bright cream via brick red to dark brown with the increasing of Pr contents. The degradation of AO7 dye was also investigated using a domestic medical ultraviolet lamp; the removal efficiency of AO7 by 1% and 2% Pr-doped CeO2approached 100%, much higher than 66.2% for undoped CeO2.Keywords:CeO2;Pr-doping;photocatalysis;pollutant degradation;mesoporous structure
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JOURNAL OF ALLOYS AND COMPOUNDS
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2016
·
IF 3.014
Guang-Xin Xiang,Guo-Jun Wang,Zhi-Jun Zhang,He Feng,Jing-Tai Zhao,Jiao Wang,Xin-Yuan Sun,Ri-Hua Mao,Yong Wang
The uniform 1D nano-rods of RE 3+ doped Ln 7 O 6 F 9 ( Ln = Y and Lu; RE = Pr, Sm and Eu) were synthesized through a facile two-step hydrothermal method without extra fluorine source followed by post-heat treatment. The phase formation, morphologies, as well as photoluminescence properties of the materials were investigated. The precursor composition was determined to be Ln (OH) 1.69 F 1.31 using the Fourier transform infrared spectrum (FT-IR), thermal gravimetric and differential scanning calorimetry (TG-DSC). The average lengths of Y 7 O 6 F 9 and Lu 7 O 6 F 9 were about 6.8 and 7.9 μm, respectively, with the average width of about 650 nm. It was interesting that the tip of the nano-rods exhibits a straight line and divergent umbrella shaped bifurcation for Y 7 O 6 F 9 and Lu 7 O 6 F 9 , respectively. Upon ultraviolet excitation, Pr 3+ , Sm 3+ and Eu 3+ ions in Ln 7 O 6 F 9 showed blue, orange and red emissions originating from their characteristic f-f transitions. In addition, the 4 f 1 5 d 1 → 4 f 2 band emissions (340–450 nm) as well as typical 4 f 2 → 4 f 2 line emissions (450–700 nm) of Pr 3+ were observed in Pr 3+ -doped Ln 7 O 6 F 9 . For Sm 3+ -doped Ln 7 O 6 F 9 , only the typical f - f transitions of Sm 3+ were observed with the absence of charge transfer (CT) band. However, the broad excitation bands at 255 nm attributing to the charge transfer transition of Eu 3+ (i.e. O 2− → Eu 3+ CT) were observed in Eu 3+ -doped Ln 7 O 6 F 9 .
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JOURNAL OF RARE EARTHS
·
2025
·
IF 7.2
Jianhua Liu,Jiarui Duan,Deyin Wang,Yuhua Wang
Phytochrome Pr and Pfr are essential for plant growth and photosynthesis, primarily absorbing deep red light at 660 nm and near-infrared (NIR) light at 730 nm. This paper is dedicated to enhance the efficiency of deep red to NIR light emission in BaLu 2– x SiAl 4– y O 12 (BLSA): x Ce 3+ , y Cr 3+ through an energy transfer strategy designed to promote plant growth and improve night vision. It is found that sample doped solely with Cr 3+ can emit deep red to NIR emission in BLSA; however, the spin-forbidden nature of the Cr 3+ 3d→3d transition leads to low luminescence efficiency. On the contrary, in Ce 3+ -doped BLSA, Ce 3+ ions efficiently absorb blue light and emit intense green light, which overlaps the wavelength range of Cr 3+ absorption spectrum. This spectral overlap promotes the energy transfer from Ce 3+ to Cr 3+ , thereby enhancing the deep red to NIR emission of Cr 3+ . This enhancement is evidenced by the external quantum efficiency of Cr 3+ emission, which is 12.5% in the sample doped solely with Cr 3+ and is increased to 48.6% when co-doped with Ce 3+ ions. The energy transfer mechanism between Ce 3+ and Cr 3+ is found to primarily involve dipole-dipole interactions, as described by Dexter's formula and multipole interaction modeling. In addition, by using BLSA:0.1Ce 3+ ,0.03Cr 3+ phosphor to fabricate NIR lighting devices, it is found that the emission spectra are highly matched with the absorption spectra of the phytochromes Pr and Pfr, demonstrating its great potential for application in indoor plant growth lighting. Moreover, the lighting source system is adaptable for various scenarios such as night vision and non-invasive bio-imaging, showcasing its promising versatility for application.
研究领域:
植物学
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光学材料
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植物生理学
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光子学
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材料科学
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Crystals
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2022
·Vol. 12
·期 7
·963
·
IF 2.67
Weili Wang,Shihai Miao,Dongxun Chen,Yanjie Liang
Trivalent lanthanides (Ln3+) doped bismuth-based inorganic compounds have attracted considerable interest as promising candidates for next-generation inorganic luminescent materials. Here, a series of K0.3Bi0.7F2.4(KBF) nanocrystalline particles with controlled morphology have been synthesized through a low-temperature aqueous-phase precipitation method. Using KBF as the host matrix, Eu3+, Tb3+, Pr3+, Nd3+, Sm3+,and Dy3+ions are introduced to obtain K0.3Bi0.7F2.4:Ln3+(KBF:Ln) nanophosphors. The as-prepared KBF:Ln nanophosphors exhibit commendable photoluminescence properties, in which multicolor emissions in a single host lattice can be obtained by doping different Ln3+ions when excited by ultraviolet light. Moreover, the morphology and photoluminescence performance of these nanophosphors remain unchanged under different soaking times in water, showing good stability in a humid environment. The proposed simple and rapid synthesis route, low-cost and nontoxic bismuth-based host matrix, and tunable luminescent colors will lead the way to access these KBF:Ln nanophosphors for appealing applications such as white LEDs and optical thermometry.
研究领域:
材料科学
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纳米技术
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光学
·
化学
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CERAMICS INTERNATIONAL
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2026
·
IF 5.6
Feng Jiang,Jie Liu,Duo Zhou,Junxiong Zhang,Zhibin Chen,Guo Feng,Quan Zhang,Xiaojun Zhang,Jianmin Liu,Yun Yu
In this study, high chroma Ce and Pr co-doped zircon-yellow ceramic pigments were synthesized via an in-situ molten salt-assisted method. The effects of Pr doping content and Si/Zr molar ratio on the color performance, phase composition, and microstructure of the pigments were systematically investigated. The results indicated that the introduced of Pr cations not only serve as the chromogenic center but also promotes the crystallization of zircon. The optimal color performance of the sample was achieved when the Pr doping content was 0.07 and the Si/Zr molar ratio was 1.05, with corresponding CIELAB values of L∗ = 77.29, a∗ = 13.78, b∗ = 76.12, and C∗ = 77.36. This color performance was remarkably superior to that of a commercially available high-grade yellow pigment ( L∗ = 82.04, a∗ = −1.62, b∗ = 56.28, and C∗ = 56.30). The synthesized pigment exhibited remarkably coloring performance, a small particle size with a narrow distribution (D 10 = 1.15 μm, D 50 = 3.72 μm, and D 90 = 7.88 μm), and good dispersibility. The in-situ molten salt-assisted method employed in this study offers advantages such as low calcination temperature, reduced environmental impact, and simple operation. This method provides a reliable strategy for the eco-friendly synthesis of high performance yellow ceramic pigments used in premium ceramic decoration.
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APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Zhenyu Zhang,Ning Wang,Xingzi Wang,Zheng Zhao,Chen Dong,Xianmin Tan,Yuanyuan Zheng,Zongyu Feng,Xiangxi Zhong,Juanyu Yang,Xiaowei Huang
With the linewidth of integrated circuits has progressively narrowed, imposing higher demands on the chemical mechanical polishing (CMP) process. Cerium oxide nanoparticles are widely used as abrasives in CMP, with their physical structure and the surface content of Ce 3+ ions and oxygen vacancies directly affecting their CMP performance. Here in, we synthesized La/Pr/Nd doped CeO 2 with the porous self-assembled spherical structures. Doping with La/Pr/Nd reduced the grain size of cerium oxide, increased its specific surface area, decreased the pore size, and increased the pore volume. HR-TEM analysis shows that the porous self-assembled spherical CeO 2 primarily exposes the (111) crystal facet. Additionally, the density functional theory (DFT) calculation, XPS, H 2 -TPR and XANES analyses shown that doping of La/Pr/Nd facilitated the formation of oxygen vacancies and increased the Ce 3+ content on the (111) crystal facet of the CeO 2 . La atoms are more likely to stabilize on the CeO 2 (111) surface compared to Pr and Nd atoms. The CMP results indicated that, The La-CeO 2 exhibited a higher MRR of 338 ± 7.54 nm/min, which is a 35 % increase compared to p-CeO 2 , and achieved superior surface roughness ( Ra = 0.201 ± 0.010 nm).
研究领域:
材料科学
·
纳米技术
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Chaochao Tao,Songsong Ding,Shengqian Wang,Lin Liu,Houfa Mao,Genyuan Chen,Hualan Xu,Chongfeng Guo,Shengliang Zhong
Multicolor emission has long been a critical scientific challenge in the field of persistent luminescence (PersL) materials, with the achievement of multicolor PersL emission within a single host matrix representing a primary research objective. Herein, a new and effective method of using coordination polymers (CPs) as precursors is designed to synthesize multicolored CdSiO 3 :RE 3+ (RE = Pr, Sm, Eu, Tb, Tm) PersL materials. Through variation of rare earth dopants, we successfully achieved color-tunable PersL emission spanning brown, pink, purple, red, green, and blue spectra. The influence of RE 3+ dopants on the crystal structure, morphology and optical properties are studied in detail. Notably, this straightforward synthesis strategy enabled the effective production of nanospherical particles exhibiting regular morphology and uniform size distribution. The electronic band structure of the material was theoretically analyzed using density functional theory (DFT) calculations. Combined with thermoluminescence (TL) measurements were performed to elucidate the underlying PersL mechanism. To demonstrate practical applications, we designed a dynamic anti-counterfeiting pattern and evaluated the potential utility of CdSiO 3 :RE 3+ materials. This study not only enhances our fundamental understanding of CdSiO 3 -based PersL materials, but also provides novel insights into morphology and size control strategies that could be extended to other PersL material systems.
研究领域:
材料科学
·
光学
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JOURNAL OF MOLECULAR STRUCTURE
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2026
·
IF 4.9
Jiafeng Hu,Ying-ying Hu,Gui-an Yang,Xiao-qin Wu
A 3D Pr-MOF: {[Pr(NDC) 1.5 (DMF)(H 2 O)]·(H 2 O)(DMF)} n ( Pr-1 , H 2 NDC=2,6-naphthalenedicarboxylic acid; DMF= N ,N-dimethylformyl) was synthesized by solvothermal method. Pr-1 was studied by thermogravimetry, infrared and powder diffraction experimental methods. The experimental results showed that the chemical properties of Pr-1 were very good, and then Pr-1 was modified on a dry glassy carbon electrode (GCE) to prepare the Pr-1 /GCE sensor, which was applied to the detection of isomers of nitrobenzyl alcohol (NBA). Pr-1 /GCE has good electrochemical properties, and can clearly identify the electrochemical signal identified by NBA isomers. In the environment containing a variety of aromatic ring small molecule interference, Pr-1 can still identify NBA isomers, and has good selection characteristics and anti-interference characteristics.
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JOURNAL OF POWER SOURCES
·
2021
·
IF 9.127
Xin Zhou,Nianjun Hou,Tian Gan,Lijun Fan,Yongxin Zhang,Jingyu Li,Ge Gao,Yicheng Zhao,Yongdan Li
BaCe 0.2 Fe 0.8-x Pr x O 3-δ (x = 0–0.3) is studied as a cobalt-free cathode material for proton-conducting solid oxide fuel cells. The cathode is composed of a cubic BaFeO 3-δ phase and an orthorhombic BaCeO 3-δ phase, and Pr is doped in both phases. The partial substitution of Pr for Fe decreases the content of the BaFeO 3-δ phase, leading to a lower electrical conductivity . BaCe 0.2 Fe 0.6 Pr 0.2 O 3-δ has the most adsorbed oxygen and Fe 3+ on the surface, resulting in the fastest oxygen surface exchange kinetics and the highest activity. The partial pressure of H 2 O shows a negligible effect on the polarization resistance of the cathode. In contrast, the polarization resistance increases remarkably with the decrease of oxygen partial pressure , indicating that the rate of the cathode process is controlled by the surface exchange of oxygen. At 700 °C, BaCe 0.2 Fe 0.6 Pr 0.2 O 3-δ shows the lowest polarization resistance of 0.057 Ω cm 2 , and a single cell with that cathode exhibits the highest maximum power density of 562 mW cm −2 . The results demonstrate that Pr doped BaCe 0.2 Fe 0.8 O 3-δ is a promising cobalt-free cathode material for proton-conducting solid oxide fuel cells.
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JOURNAL OF HAZARDOUS MATERIALS
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2021
·
IF 10.588
Zhihao Zhang,Shendan Zhang,Chunjie Jiang,Haichuan Guo,Fengdong Qu,Yuichi Shimakawa,Minghui Yang
Distinguishing toxic gases among the various volatile sulfur compounds (VSCs) is of significant practical value for atmospheric and environmental pollution monitoring, industrial monitoring, and even for medical diagnostics (where VSCs are indicators of diseases). The particular challenge lies in the detection and discrimination of sulfur-containing gases such as dimethyl disulfide (DMDS), methyl sulfide (DMS), hydrogen sulfide (H 2 S), and carbon disulfide (CS 2 ) is of value. Herein, single-phase perovskite-type LnFeO 3 nanoparticles were prepared by the citrate sol-gel method. Their gas sensing characteristics regard to the four typical VSCs were investigated. We found that the gas response of the p-type semiconductor LnFeO 3 gas sensors to the four typical VSCs are significantly different. In addition, the sensors offer high performance, good tolerance to environmental changes and long-term stability for detecting VSCs gas at an operating temperature of 210 °C. A new design of sensor array was realized by integrating a series of LnFeO 3 materials, which revealed excellent recognition ability for various VSCs, showing promise for real time monitoring.
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FOOD AND CHEMICAL TOXICOLOGY
·
2020
·
IF 4.679
Chunlei Zhu,Fengru Liu,Yunlong Wei,Fan Zhang,Ting Pan,Yingwang Ye,Yizhong Shen
Having reported that rare earth elements displayed potential toxicity i n vivo , often be found in soil, plants and etc. , which might be easily chelated with the natural functional molecule rutin to form rutin metal complexes, ultimately entering the human body by means of food chain . However, few reports paid the attention on the toxicology of the complexes consisting of rutin with rare earth ions. Here, we focused on the potential toxicity by probing the site-selective binding of the rutin-rare earth ions complexes to human serum albumin (HSA). As a proof-of-concept, we selected Pr 3+ as the representative to conjugate with rutin to form rutin-Pr(III) complex, which was further applied to interact with HSA in aqueous solution. The results exhibited that the rutin-Pr(III) complex primary bound to the hydrophobic cavity at site II (subdomain IIIA) of HSA through hydrogen bonding and van der Waals force . Through the thermomechanical analysis, we found this binding process was spontaneous because of the negative Δ G. We believe that this work may offer a new insight into understanding the physiological effects ( e.g. toxicology) of rutin and rare earth ions, which could be helpful to guide their rational use in the agriculture and environment-related industries.
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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.
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