JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2015
·
IF 1.909
Xuesong Wang,Jinbao Zhang,Lianyuan Wang,Shouchun Li,Li Liu,Chang Su,Lili Liu
Pure and Er-doped In 2 O 3 nanotubes were systematically fabricated by using a single nozzle eletrospinning method followed by calcination . The as-synthesized nanotubes were characterized by scanning electron microscopy (SEM), energy-dispersive X-ray (EDX) spectrometry and X-ray powder diffraction (XRD). Compared with pure In 2 O 3 nanotubes, Er-doped In 2 O 3 nanotubes exhibit improved formaldehyde sensing properties at 260 °C. The response of Er-doped In 2 O 3 nanotubes to 20 ppm formaldehyde is about 12, which is 4 times larger than that of pure In 2 O 3 nanotubes. The response and recovery times of Er-doped In 2 O 3 nanotubes to 20 ppm formaldehyde are about 5 and 38 s, respectively. Furthermore, the response of Er-doped In 2 O 3 nanotubes to 100 ppb formaldehyde is 2.19.
研究领域:
材料科学
·
环境科学
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DOI
高影响因子
Food & Function
·
2014
·Vol. 5
·期 7
·1520-1528
·
IF 2.907
Ye-wei Huang,Huan-huan Xu,Su-min Wang,Yi Zhao,Yu-min Huang,Run-bo Li,Xuan-jun Wang,Shu-mei Hao,Jun Sheng
Caffeine is present in a number of dietary sources consumed worldwide. Although its pharmacokinetics has been intensively explored, little is known about complexed caffeine (C-CAF) in aqueous extraction of fermented Pu-er tea. The major components of C-CAF are oxidative tea polyphenols (OTP) and caffeine. Furthermore, the C-CAF can be precipitated in low pH solution. After administering the same amount of total caffeine and comparing the peak level of plasma caffeine with the coffee (contains 0.11 ± 0.01% C-CAF) group, the results showed that the caffeine/OTP (contains 66.67 ± 0.02% C-CAF) group and the instant Pu-er tea (contains 23.18 ± 0.02% C-CAF) group were 33.39% and 25.86% lower, respectively. The concentration of the metabolites of caffeine supports the idea that the absorption of the C-CAF was inhibited in mice. Congruent with this result, the amount of caffeine detected in mice excrement showed that more caffeine was eliminated in the caffeine/OTP group and the Pu-er tea group. The locomotor activity tests of mice demonstrated that the stimulating effect of caffeine in caffeine/OTP and Pu-er tea was weaker than in coffee. Our findings demonstrate that caffeine can be combined with OTP and the absorption of C-CAF is inhibited in mice, thus decreasing the irritation effect of caffeine. This may also be developed as a slow release formulation of caffeine.
研究领域:
药理学
·
茶学
·
动物生理学
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DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2015
·
IF 2.605
T. Wei,Z. Dong,C.Z. Zhao,Y.J. Ma,T.B. Zhang,Y.F. Xie,Q.J. Zhou,Z.P. Li
Er-doped Sr 2 Bi 4 Ti 5 O 18 (SBT- x ) ceramics were synthesized via a solid-state reaction method, and their structure, up-conversion luminescence (UCL), temperature sensing performance and ferroelectric behaviors were investigated. The obtained SBT- x samples crystallize in the polar orthorhombic phase, with space group B2cb. Under 980 nm excitation, bright green and weak red emissions are observed which correspond to the transitions from 2 H 11/2 / 4 S 3/2 and 4 F 9/2 to 4 I 15/2 level, respectively. The optimal doping concentration of Er 3+ in SBT host is determined as 0.08. The critical energy transfer distance ( R c ) is about 20.57 Å and the major interaction mechanism among Er 3+ ions is determined as the d–d interaction. A possible UCL mechanism is proposed in light of the dependence of emission intensities on pumping power. Furthermore, optical temperature sensing properties are also investigated according to the fluorescence intensity ratio (FIR) of green emissions at 527 and 550 nm in the temperature range from 303 K to 573 K. The maximum sensing sensitivity is found to be 0.0042 K −1 . Additionally, the response of SBT- x to external electric field stimuli is also confirmed. It is believed that SBT- x has potential application as optical temperature sensing materials.
研究领域:
材料科学
·
光学
·
物理学
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DOI
高影响因子
LUMINESCENCE
·
2017
·Vol. 33
·期 1
·138-144
·
IF 1.509
Liping Zhang,Jianguo Zhang,Hongqi Chen,Lun Wang
An redox luminescence switch was developed for the sensing of glutathione (GSH), l -cysteine (Cys) or l -ascorbic acid (AA) based on redox reaction. The Mn 2+ -doped NaYF 4 :Yb,Er upconversion nanorods (UCNRs) with an emission peak located in the red region were synthesized. The luminescence intensity of the UCNRs could be quenched due to the Mn 2+ could be oxidized to MnO 2 by KMnO 4 . Subsequently, when the AA, GSH or Cys was added into the MnO 2 modified upconversion nanosystem, which could reduced MnO 2 to Mn 2+ and the luminescence intensity was recovered. The concentration ranges of the nanosystem are 0.500–3.375 mM (R 2 = 0.99) for AA, 0.6250–11.88 mM (R 2 = 0.99) for GSH and 0.6250–9.375 mM (R 2 = 0.99) for Cys, respectively.
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PubMed
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2022
·Vol. 128
·期 9
·1-9
·
IF 2.983
Han Zhanwen,Yu Hongquan,Tian Zhuang,Zhang Jinsu,Sun Jiashi,Li Xiangping,Xu Sai,Chen Baojiu
The lanthanide-based white light-emitting diodes excited by irradiation at a wavelength of 980 nm have attracted increasing attention because of their low photon frequency and ease of implementation. Here, we report on warm, white, Y 2 Ti 2 O 7 :Tm/Yb/Er nanotubes prepared by a simple single-needle electrospinning method. The Y 2 Ti 2 O 7 :Tm/Yb/Er nanotubes have an outer diameter of about 180 nm, and a wall thickness of 36 nm. Their color coordinates and chromaticity were controlled to yellow → red → warm white by adjusting the Tm 3+ concentration from 0.5 to 2.0%. The luminescence properties and upconversion mechanism of Y 2 Ti 2 O 7 :Tm/Yb/Er nanotubes were investigated. The warm white Y 2 Ti 2 O 7 :Tm/Yb/Er nanotubes exhibit a strong correlated color temperature to a household incandescent lamp.
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高影响因子
OPTICAL MATERIALS
·
2021
·
IF 3.08
Huilian Qin,Jing Li,Meijuan Yuan,Yaru Peng,Yuxin Huang,Li Chen
Monodisperse sub-10 nm Sc 2 O 3 : Yb, Er upconverting nanoparticles (UCNPs) were firstly synthesized via solvothermal method in three-neck round-bottom flask. The X-ray diffraction (XRD) shows that the prepared UCNPs possess cubic structure. The transmission electron microscopy (TEM) shows that sample has monodisperse spheroid morphology with high crystallinity . The average size of spheroid UCNPs could be controllable manipulated as small as 3 nm. Furthermore, the sample exhibits stronger red and green upconversion luminescence (UCL) than reported Sc 2 O 3 : Yb, Er nanostructure by biphasic solvothermal method. The Fourier-transform infrared (FTIR) spectra and decay curve reveal that ultra-small Sc 2 O 3 : Yb, Er UCNPs exhibit the reduced surface groups and long decay time of Er 3+ ions. The results indicate Sc 2 O 3 : Yb, Er UCNPs is a probable oxide material with small size and intense UCL for biological applications.
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高影响因子
JOURNAL OF BIOLOGICAL INORGANIC CHEMISTRY
·
2010
·Vol. 15
·期 4
·591-599
·
IF 3.415
Zhu Hua,Huang Liliang,Zhang Yuanqing,Xu Xiaoping,Sun Yanhong,Shen Yu-Mei
To develop technetium- and rhenium-labeled nonsteroidal estrogen imaging agents for estrogen receptor (ER) positive breast tumors, two groups of rhenium and technetium cyclofenil derivatives were synthesized and characterized. The binding affinities of the rhenium complexes for ERs were determined. The tricarbonyl rhenium complex showed the highest binding affinity for ERs (81.2 for ERβ, 16.5 for ERα). Tricarbonyl technetium cyclofenil complexes were obtained in high radiochemical purity and radiochemical yields. The results of studies of their octanol/water partition and in vitro stability are presented. These results demonstrate that these radiolabeled cyclofenil derivatives may be considered as potential breast cancer imaging agents.
研究领域:
医学影像学
·
药物化学
·
肿瘤学
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DOI
PubMed
高影响因子
INORGANIC CHEMISTRY
·
2026
·Vol. 65
·期 30
·17837-17844
·
IF 4.6
Li Dongrui,Feng Yujie,Cai Zhengwei,Sun Shengjun,Liu Mingyu,Yang Yu,Han Qifeng,Yang Chaoxin,Yao Yongchao,Liu Xuefei,Liu Qian,Sun Xuping,Tang Bo
Direct seawater electrolysis offers a sustainable route
to green
hydrogen production, but its practical deployment demands durable
anodic catalysts under chloride-rich conditions. Here, we report on
the development of Er-incorporated NiFe layered double hydroxide on
nickel foam (Er-NiFe LDH/NF) as a robust oxygen-evolution anode for
ampere-level seawater oxidation. On one hand, Er functions as a Lewis-acidic
center to enrich hydroxide anions and electrostatically repels chloride
ions, thereby suppressing chloride-induced corrosion; on the other
hand, its unique 4f electronic configuration modulates the electronic
structure of NiFe LDH. Consequently, the optimized catalyst achieves
a low overpotential of 350 mV at 1000 mA cm –2 and
sustains this current density ( j ) for 1000 h. Moreover,
the assembled anion exchange membrane electrolyzer, using Er-NiFe
LDH/NF as the anode and Pt/C/NF as the cathode, delivers a j of 500 mA cm –2 at a low cell voltage
of 2.20 V with 500 h of stable operation.
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高影响因子
Advanced Optical Materials
·
2026
·
IF 7.2
Sihan Wang,Xiaojun Guo,Xiadiyan Refuhati,Yanzhen Xiao,Lei Yan,Zhengkun Fu,Zhenglong Zhang
Upconversion luminescent materials have broad application prospects in lighting, display, and laser technology. However, single-phase systems are constrained by performance bottlenecks, making it difficult to simultaneously achieve high temperature sensitivity and tunable luminescence. To address this challenge, (Yb x Er 1-x ) 2 SiO 5 /SiO 2 multiphase composite phosphors are synthesized using a low-temperature (300 °C) hydrothermal method. Under 976 nm excitation, the material exhibits concentration-dependent luminescence: as the Yb fraction increases, the red emission at 660 nm continuously enhances, while the green emission shows initial enhancement followed by suppression. This behavior is attributed to an energy back-transfer mechanism between Yb 3+ and Er 3+ ions. Regarding temperature sensing, a highly repeatable thermal response is observed through the fluorescence intensity ratio of Er 3+ levels. Specifically, the thermally coupled levels show a relative sensitivity of 1.91% K −1 , while the non-thermally coupled levels exhibit an absolute sensitivity of 0.1063 K −1 . Furthermore, precise adjustment of Yb 3+ content, excitation power, or temperature enables continuous color tuning from green to red. This work simultaneously realizes high-precision temperature sensing and dynamic luminescence color control in upconversion materials, providing novel design concepts and practical pathways for developing multifunctional optical materials.
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高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Guangxu Li,Yongli Luo,Qin Zhou,Jiangtao Wu,Xiaochun Wu,Wentao Jiang
Poor humidity resistance and insufficient ultralow detection capability remain unsolved issues for metal oxide semiconductor-based gas sensors. Herein, we prepared a range of Er 3+ -doped BiFeO 3 solid solutions for acetone gas sensing. Among them, Bi 0.92 Er 0.08 FeO 3 gave a 550% increase in gas response and a detection limit of down to 1 parts-per-billion for acetone vapor. Moreover, its gas response curve kept nearly unchanged across varying humidity, showing strong humidity independence. The high dielectric constant, large lattice distortion, and domain wall conductivity generated by the non-centrosymmetric structure prove beneficial for acetone sensing performance. This work presents a rational approach to designing high-performance gas sensors through tuning dielectric constant and crystal structure.
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高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Xin Tong,Hongquan Yu,Xiangping Li,Sai Xu,Baojiu Chen
Owing to their environmental friendliness, structural tunability, and ability to emit self-trapped excitons, lead-free halide double perovskites (DPs) have demonstrated significant potential for applications in light-emitting diodes (LEDs) and photodetectors. However, their chemical and thermal stability is generally insufficient. These limitations hinder their practical application in LEDs, as these devices typically generate considerable heat under high operating currents and prolonged usage, particularly in the case of infrared LEDs. In this work, Er 3+ -doped double perovskites (Cs 2 NaYCl 6 and the Cs 2 NaYCl 6 @0.6 KBr composite) were synthesized via a hydrothermal method. The emission intensity of Cs 2 NaYCl 6 :2 % Er 3+ @0.6 KBr is five times greater than that of Cs 2 NaYCl 6 :2 % Er 3+ within the wavelength range of 1400–1600 nm. In the Cs 2 NaYCl 6 :Er 3+ @0.6 KBr composite, the surface defects of Cs 2 NaYCl 6 :Er 3+ were modified by the introduction of KBr, leading to an increase in the external quantum efficiency (EQE) of Cs 2 NaYCl 6 :Er 3+ from 9.5 % to 30.0 %. Under a 150 mA working current, the operating temperatures of the near-infrared (NIR) LED devices based on the Cs 2 NaYCl 6 :2 %Er 3+ and Cs 2 NaYCl 6 :2 %Er 3+ @0.6 KBr composite are 53.2 and 47.4 °C, respectively. After working for 2 h, the temperatures of the NIR LEDs based on Cs 2 NaYCl 6 :2 %Er 3+ and Cs 2 NaYCl 6 :2 %Er 3+ @0.6 KBr were 60.3 °C and 46.0 °C, respectively, under a 100 mA operating current.
研究领域:
材料科学
·
光学工程
·
固态照明技术
·
稀土发光材料
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
You Li,Sai Xu,Yuefeng Gao,Yongze Cao,Xizhen Zhang,Hongquan Yu,Yichao Wang,Tianshuo Liu,Baojiu Chen
The intrinsic challenge to thermally responsive photoluminescent materials is pertaining to the limited thermal stability and reproducibility. Most prevailing photoluminescent agents suffer from constraints imposed by their frail chemical structure , rendering them fail to work at elevated temperatures for a long time. This inherent limitation curtails their utility within domains in anti-counterfeiting and encoded information storage. Herein, a series of double perovskite Cs 2 NaInCl 6 : Sb 3+ /Ln 3+ (Ln = Er, Dy, Tb, Ho) phosphors were synthesized using the high-temperature hydrothermal method . Upon ultraviolet light illumination, the blue emission band of self-trapped excitons (STEs) and intrinsic emissions of Ln 3+ are observed. In light of the variations in thermal quenching levels of the two emission centers and the effect of temperature on the lifetime of Ln 3+ , multi-mode thermometers with superior sensitivity are established. Moreover, they also can be used in anti-counterfeiting and encoding information storage, relying on the significant temperature-dependent color variation, excellent thermal stability and repeatability. The unique thermochromic properties and satisfactory stability of Cs 2 NaInCl 6 : Sb 3+ /Ln 3+ (Ln = Er, Dy, Tb, Ho) phosphors bring forward a new concept of developing multi-mode thermometers and reliable information encryption systems with the application of thermochromic materials.
研究领域:
材料科学
·
光学
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DOI
高影响因子
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