CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
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2025
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IF 3
Guo Wenhang,Zeng Liang,Zhang Xinyuan,Cai Xiaoyu,Su Tan,Su Zhongmin
A silicate inorganic phosphor matrix, CJU-1-Eu (K 3 EuSi 6 O 15 ), based on rice husk-derived biomass silicon, was synthesized via a hydrothermal method. The material was doped with Tb 3+ ions, and the effect of Tb 3+ concentration was investigated, resulting in a series of tunable white-light inorganic phosphors (CJU-1-Eu: x Tb 3+ ) ranging from warm white to cool white. The CJU-1-Eu:0.04Tb 3+ inorganic white-light phosphor was combined with a UV chip to produce the white-light-emitting diode (WLED) device. The device exhibited CIE coordinates of (0.332, 0.327) and the color rendering index (CRI) of 86.5 at 100 mA current. This white-light phosphor achieves both the recycling and high-value utilization of rice husk ash.
研究领域:
材料科学
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环境科学
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光学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED PHYSICS
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2022
·Vol. 132
·期 13
·
IF 2.877
Wang Yi,Yan Jun,Chen Yunlin,Cui Qiuhong
Generally, researchers focus on the great negative magnetocaloric effect (NMCE) rather than the positive magnetocaloric effect (PMCE) in Mn 3 GaC. Here, we prepared Mn 3 Ga 1−x Tb x C composites with a partial substitution of Ga by Tb. Tb doping expands the canted-ferromagnetic phase (CFM) between the anti-ferromagnetic and ferromagnetic phase in Mn 3 Ga 0.97 Tb 0.03 C. The CFM phase can be as a boundary to separate the NMCE from PMCE. It is possible to combine the NMCE and PMCE for refrigeration. Compared with NMCE in Mn 3 GaC, NMCE–PMCE combination in Mn 3 Ga 0.97 Tb 0.03 C displays a much larger operating temperature range without loss of magnetic entropy changes. Therefore, the NMCE–PMCE combination is valuable for improving the operating temperature range of magnetocaloric effect materials. It also provides a new idea for refrigeration applications.
研究领域:
材料科学
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物理学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Bowen Wang,Xuyan Xue,Changshuai Gong,Xuejiao Wang,Qiushi Wang,Ji-Guang Li
A series of Tb 3+ substituted layered perovskite Sr(La 1- x Tb x )AlO 4 ( x = 0–1) was synthesized via solid-state reaction. The influence of Tb 3+ on the phase, structure, photoluminescence, and long afterglow properties of the SrLaAlO 4 product was investigated. The fully substituted product SrTbAlO 4 was found to be isostructural with its SrLaAlO 4 counterpart, and the crystal structure parameters were first reported in this work. Photoluminescence investigation found that benefiting from the unique layered crystal structure, the activator Tb 3+ was well separated and the optimal doping concentration was found to be as high as 20 at%. Except for photoluminescence, the products simultaneously show long afterglow properties due to disorder cations distribution in the local structure and thus induced defect condition. When the UV light source is turned off, the afterglow luminescence of SrLaAlO 4 : 0.03 Tb 3+ can last over 1 h. The trap distribution of SrLaAlO 4 : Tb 3+ was analyzed in detail by thermoluminescence. The trap depth is calculated to be around 0.7–0.81 eV, the value of which highly coincides with the ideal energy level for trapping and releasing electrons at room temperature. On the basis of the experimental results, the mechanism of long afterglow luminescence of SrLaAlO 4 : Tb 3+ is elaborated and discussed.
研究领域:
材料科学
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光学
✓ 已验证
DOI
高影响因子
ACS Applied Electronic Materials
·
2025
·
IF 4.7
Na Chu,Zhihua Wang,Fubo Gu
Tb-doped SnO2 (represented as Tb–SnO2) was prepared by calcining Tb-doped Sn MOF synthesized by a solvothermal method. 5% Tb–SnO2 exhibits excellent selectivity, high response (28.2), and fast response/recovery time (28 s/135 s) toward 50 ppb (volume concentration in parts per billion) formaldehyde (HCHO) at low operating temperature (200 °C). The low detection limit of the HCHO gas sensor is mainly due to the large number of oxygen vacancies in Tb–SnO2 caused by the charge imbalance between Tb ions and Sn ions during the high-temperature calcination process of Tb-doped Sn MOF. Oxygen vacancies promote the conversion of oxygen molecules into active adsorbed oxygen species, narrow the band gap of semiconductor oxides, and reduce the activation energy of formaldehyde gas-sensing reactions, thereby improving the performance of gas sensors. 5% Tb–SnO2 gas sensor has strong moisture resistance, with a response value of 209.3 to 10 ppm of HCHO at a high relative humidity of 80%. The moisture resistance mechanism of the material is explained as Tb3+/Tb4+ redox pairs acting as water molecule capture agents, which reduce the occupation of gas-sensing reaction active sites by water molecules on the material surface.
研究领域:
材料科学
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化学传感器
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环境监测
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Yong Xu,Yue Wang,Ping Wang,Yishun Wang,Weili Dai,Jianping Zou,Xubiao Luo
Employing electric energy to convert carbon dioxide (CO 2 ) into valuable small molecules is a potentially practical method in energy storage and greenhouse gas alleviation. A huge challenge for electrocatalytic CO 2 reduction is to reduce overpotential to improve energy efficiency. Herein, we demonstrate that doping alloy Pd 49 Ag 30 Te 4 (PAT) with rare-earth element Tb is beneficial for selective exposure of (1 1 1) crystal plane, which is a highly active crystal plane for producing carbon monoxide (CO). The as-prepared Tb 2.9 PAT exhibited high electrocatalytic performance with 95.7 % CO faradic efficiency at − 0.8 V (vs RHE), far exceeding that of PAT, and coupled with good durability. In situ spectral study and theoretical calculations disclose that the introduction of Tb regulates the d-band center of PAT alloy, weakens the Pd − C bonding ability, and promotes the desorption of *CO in the rate-determining step. This study provides a method for doping induced selective exposure of crystal face, which provides new idea for improving catalytic performance.
研究领域:
材料科学
·
电化学
·
催化
✓ 已验证
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Haowei Lu,Jiaqi Lin,Haiwu Zheng
The ferroelectric properties and fatigue resistance of 47(Ba 0.7 Ca 0.3 )TiO 3 –53Ba(Zr 0.2 Ti 0.8 )O 3 (BCZT) film can be enhanced by Tb modified and adding SrTiO 3 (STO) buffer layer using pulsed laser deposition(PLD) method. The 0.4 mol% Tb doped BCZT/STO(0.4Tb-BCZT/STO) film possesses optimal comprehensive electrical properties. Comparing with traditional BCZT film gown on Pt, the residual polarization( P r ), piezoelectric coefficient( d 33 *), permittivity( ε r ) of 0.4Tb-BCZT/STO film increase from 3.6 to 9.0 μC/cm 2 , 52 to 75 pm/V, 880 to 1210 and loss(tanθ) decrease from 0.028 to 0.017(10 4 Hz), respectively. During a high electric field, the degradation of P r is only 5.8% and the increase of E c is about 6.1% in 0.4Tb-BCZT/STO film after 10 9 switching cycles, which show the excellent fatigue resistance. The improved polarization and fatigue performances of film benefits from the reduced pinning influence with lower defect concentration based on a series of experiments and theoretical simulation. This work demonstrates the potential candidates of lead-free nonvolatile memory micro-devices applied in microelectronic industry.
研究领域:
材料科学
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电子工程
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2023
·Vol. 52
·期 5
·3132-3145
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IF 2.1
Xu Zhixuan,Xia Tianrui,Cheng Lichun,Xiang Ri,Yao Qingrong,Long Qianxin,Lu Zhao
Due to the frequent use of electronic equipment, electromagnetic radiation pollution has become a prominent problem. The use of microwave-absorbing materials can effectively solve this phenomenon. In this study, flaky Dy 2- x Co 17 Tb x alloy powders were prepared by vacuum smelting, and the microwave absorption performance was investigated by changing the Tb doping amount and matching thickness. The results show that the magnetic loss and dielectric loss are improved to a certain extent with the doping of Tb, and the absorption peak value moves to the low-frequency region. At the same time, the saturation magnetization (Ms) decreases with the increase in Tb doping. When x = 0.2 and the matching thickness is 1.6 mm, the minimum reflection loss (RL min ) value is −40.9 dB at 10.08 GHz, and the effective absorption bandwidth (EAB) is 1.6 GHz (9.28~10.88 GHz). In general, Dy 2- x Co 17 Tb x alloy powders have good microwave absorption performance in the X band.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
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