NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 28
·12201-12207
·
IF 3.288
Yan Qiao,Xionglin Zhou,Hongchao Geng,Leilei Sun,Deshuai Zhen,Qingyun Cai
A β-NaYF4:Yb,Er,Gd nanorods@1T/2H-MoS2 nanocomposite was fabricated and used for photocatalytic sterilization under illumination from single near-infrared (NIR) light. Approximately 99.3% of Escherichia coli were killed effectively by 15 min irradiation of NIR light at a dose of 40 μg mL−1. The effective bactericidal activity is ascribed to the high upconversion luminescence efficiency of β-NaYF4:Yb,Er,Gd and the layered two-dimensional nanosheet structure of 1T/2H-MoS2. Under 980 nm light irradiation, β-NaYF4:Yb,Er,Gd emits visible light, which is absorbed by MoS2, producing strongly oxidative holes and reductive electrons. Photogenerated electron–hole pairs were able to react with H2O, O2 and OH− to produce reactive species in aqueous solution. These reactive species are strong nonselective oxidizing agents for sterilization.
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Zhilun Zhang,Wei Xie,Xuanru Ren,Bingqing Zhao,Ziqi Zhao,Qian Wang,Mingliang Li,Hailong Wang
To enhance oxidation resistance of carbon/carbon (C/C) composite materials at 1973 K in static air, a novel bilayer Yb 2 O 3 -HfB 2 -SiC/SiC (denoted YHSS) coatings were engineered via a two-step process combining pack cementation and slurry method. A substantial loading of ceramic phases (∼60 wt %) was incorporated into the SiC ceramic layer to improve thermal stability of the oxide scale at 1973 K. Following pre-oxidation, the YHSS coatings impart effective oxidation protection to C/C composite materials for over 228 h at 1973 K. Coupled experimental and theoretical analyses confirm that Yb and Hf atoms diffuse into the thermally grown SiO 2 layer, thereby reinforcing the SiO 2 network structure. Furthermore, the coating's exceptional performance is attributed to its dense, flaw-free surface morphology and the homogeneous dispersion of high-content ceramic phases throughout the SiC layer, collectively suppressing oxygen permeation.
研究领域:
材料科学
·
陶瓷涂层
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高温材料
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复合材料
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表面工程
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DOI
高影响因子
ChemCatChem
·
2017
·Vol. 9
·期 18
·3611-3617
·
IF 4.803
Wan-Ni Wang,Fu Zhang,Chuan-Ling Zhang,Yan-Chuan Guo,Wei Dai,Hai-Sheng Qian
Graphical ZnO way ! ZnO composite microfibers with different microstructures and embedded with a high population of upconversion nanoparticles are fabricated and show an excellent photocatalytic ability driven by near-infrared light. The fabrication of photocatalysts driven by near-infrared (NIR) light is of great scientific and technological interest to make use of solar energy. NaYF 4 codoped with Yb 3+ and Tm 3+ upconversion nanoparticles are important nanotransducers that transfer NIR photons to high-energy photons (UV/Vis). In this work, we demonstrated an electrospinning technique to synthesize ZnO and porous ZnO composite microfibers embedded with a large amount of NaYF 4 :Yb/Tm@NaYF 4 nanoparticles. The morphologies, chemical compositions, and phase of the as-prepared composites were investigated carefully by using field-emission scanning electron microscopy, TEM, X-ray photoelectron spectroscopy, fluorescence spectroscopy, and XRD. Steady-state and dynamic-state fluorescence spectra were used to demonstrate that the embedded NaYF 4 :Yb/Tm@NaYF 4 core–shell nanoparticles can activate the ZnO nanoparticles under IR irradiation. The ZnO composite microfibers can efficiently transfer the NIR photons to the excited state of ZnO and activate the semiconductor to produce reactive oxygen species to result in the degradation of rhodamine B dyes.
研究领域:
材料科学
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纳米技术
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光催化
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环境科学
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DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 41
·32891-32896
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IF 3.84
Xinyuan Zhang,Kezhi Zheng,Chunyu Liu,Hao Li,Zhiqi Li,Jinfeng Li,Yeyuan He,Wenbin Guo,Liang Shen,Shengping Ruan
In this contribution, we study the effects of NaLuF4:Yb,Tm nanorods (NRs) dopant on the performance of inverted polymer bulk heterojunction (BHJ) solar cells. The study allows us to investigate the impact of NRs on the light-harvesting and photocurrent in BHJ solar cells fabricated with PCDTBT blended with [6,6]-phenyl-C71-butyric acid methylester (PC71BM) acceptor. By controlling the doping concentrations, we demonstrate that the power conversion efficiency (PCE) of PCDTBT:PC71BM solar cells increases from 6.02% to 7.18% mainly due to improving light absorption and photocurrent. The single carrier devices reveal that the electron and hole mobilities both rise in doped devices, contributing to the enhancement of photoconductivity and consequent PCEs.
研究领域:
光伏学
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纳米材料
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聚合物电子学
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太阳能转换
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DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2019
·
IF 2.961
Manli Zhang,Xuesong Zhai,Pengpeng Lei,Shuang Yao,Xia Xu,Lile Dong,Kaimin Du,Chengyu Li,Jing Feng,Hongjie Zhang
Temperature sensors based on upconversion luminescence (UCL) intensity ratio have attracted great attention due to the high sensitivity. The enhancement of UCL is helpful to improve the sensitivity of temperature sensor. Doping is an effective way to achieve the UCL enhancement. Ga 3+ ions doped NaYF 4 :18%Yb,2%Er have been prepared through a facile one-pot solvothermal method . Upconversion (UC) emission intensity was significantly enhanced by introducing Ga 3+ ions into the lattice of NaYF 4 :Yb,Er, especially the green UC emission. With Ga 3+ concentration increasing, the size of the resulting NaYF 4 :Yb,Er,x%Ga particles decreases gradually. By doping 25% Ga 3+ , the green UC emission is increased by 30 times, while the red emission is enhanced by only 8 times. The morphology of particles and local symmetry around Er 3+ ions have been changed, resulting in the selective enhancement of green UC emission. In addition, the temperature-dependent UCL properties of NaYF 4 :Yb,Er,25%Ga and NaYF 4 :Yb,Er were investigated. The maximum thermal sensitivity of NaYF 4 :Yb,Er,25%Ga could reach 0.0046 K −1 at 498 K. Therefore, NaYF 4 :Yb,Er,25%Ga with strong green UCL could be served as a potential candidate for sensitive temperature sensing.
研究领域:
材料科学
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光学传感器
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发光材料
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纳米技术
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DOI
高影响因子
Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 44
·13811-13817
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IF 6.641
Tianhui Wang,Taizhong Xiao,Youzhun Fan,Fangyu He,Yongjin Li,Yuehong Peng,Qi Wang,Zhaoyi Yin,Zhengwen Yang,Jianbei Qiu,Zhiguo Song
A heating-induced monotonous increase in the Yb3+ excited state (2F5/2) lifetimes is found in Yb3+ single doped Bi7F11O5 nanocrystals, possibly due to the thermal-enhanced photocarrier separation in polarized layered semiconductors with spontaneous internal electric fields. This unique phenomenon is evaluated for its thermometric performance in terms of lifetime luminescence thermometry, and the maximum absolute/relative temperature sensitivity (Sa/Sr) reaches as high as 0.65 μs K−1/0.24% K−1 in biological temperature regions. The results of this work can offer great potential for lifetime luminescence thermometry in biological areas and provide ideas for designing efficient photonic and photoelectric thermal devices.
研究领域:
材料科学
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纳米技术
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荧光测温
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光子学
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光电学
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固态物理
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Ze-Yuan Yang,Qiu-Yu Luo,Chong-Yu Wang,Yang-Wei Wang,Jiang-Hu Yu,Xi Yan,Yi-Xin Zhang,Xing Yang,Jing Feng,Zhen-Hua Ge
Due to their high abundance, low cost, and low toxicity, Bi 2 S 3 -based thermoelectric materials without Te are significantly promising for eco-friendly and scalable applications. However, the ZT value of Bi 2 S 3 -based is not high enough and must be further improved. The rare-earth element doping is a promising strategy for synergistically enhancing the electrical and thermal transport properties. This study selected GaTe and YbBr 3 for co-doping in Bi 2 S 3 polycrystals using a solid-state reaction and spark plasma sintering, which enabled simultaneous modulation of the band structure and carrier concentration for significantly enhanced thermoelectric and mechanical properties. Specifically, the synergistic optimization of electrical and phonon transport was initially achieved through GaTe doping in Bi 2 S 3 , which effectively reduced the lattice thermal conductivity while enhancing electrical conductivity. However, the improvement in thermoelectric performance with GaTe doping alone remained limited. Br substituted S to introduce extra electrons, while Yb replaced Bi to reduce the bandgap from 1.38 to 1.05 eV. The two effects synergistically optimized the electrical transport properties of the matrix. As a result, the optimized Bi 2 S 3 + 0.5 wt% GaTe +1.0 wt% YbBr 3 sample achieved an exceptional average power factor of 475.4 μW m −1 K −2 over 323–773 K. Additionally, point defects, dislocations, and micropores induced by the second phase contributed to strong phonon scattering, leading to a low lattice thermal conductivity of 0.56 W m −1 K −1 at 773 K. Consequently, a peak ZT value of 0.67 at 773 K and a high average ZT value of 0.45 over 323–773 K were achieved, which were relatively higher than other values reported in the literature. Furthermore, the mechanical properties were improved, with hardness increasing from 2.55 to 2.93 GPa, making Bi 2 S 3 more deformation-resistant and durable. This study showed that co-doping rare earth elements was an effective approach for enhancing the thermoelectric and mechanical properties of the Bi 2 S 3 material.
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高影响因子
MATERIALS CHARACTERIZATION
·
2025
·
IF 5.5
Qian Wen,Xiaopeng Hu,Junyao Wu,Qing Liu,Sai Liu,Duzhong Zhu,Jinwei Guo,Wang Zhu
Medium-high entropy RETaO 4 (RE = Y, Gd, Yb, Dy, Sm) ceramics are prepared by high-temperature solid-state reaction. Results show that doping rare earth ions into the A site improves the hardness, elastic modulus, fracture toughness, and fracture strength of the ceramics. As the solid solution components increase, hardness rises from 5.19 GPa to 7.43 GPa, elastic modulus from 55.2 GPa to 88.8 GPa, fracture toughness from 1.10 MPa·m 1/2 to 2.05 MPa·m 1/2 , and fracture strength from 31.8 MPa to 58.6 MPa. This enhancement is attributed to higher lattice distortion, increased internal energy, and stronger bonding. The proportion of transgranular fracture increases with solid solution content. Ferroelastic domain structures cause crack tip deflection, leading to greater fracture energy absorption. Furthermore, high-entropy and lattice distortion effects in (5RE 1/5 )TaO 4 ceramics promote high-density dislocation regions under stress, enhancing dislocation toughening.
研究领域:
材料科学
·
力学
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DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2025
·
IF 3.8
Shuo Yan,Yuhong Chen,Ziqiang Yin,Binwei Huang,Quanxing Ren,Tihao Cao,Xuxin Ping,Ruibin Liu,Zhengren Huang,Qing Huang,Yinsheng Li
SiC ceramics were fabricated by spark plasma sintering of β-SiC powder with various rare-earth (RE = La, Gd, Yb, Sc) oxides and magnesia additives. The phase compositions, microstructures, lattice oxygen contents, and thermal conductivities were systematically investigated. A decrease in the cationic radius of rare-earth element resulted in an increased cationic field strength. This enhanced attraction to oxygen anion led to higher viscosity and improved high-temperature stability of the intergranular RE-Mg-Si-O liquid phase. After sintering at 1850°C, influenced by liquid-phase viscosity, the degree of β→α phase transformation in SiC and the grain size decreased with decreasing cationic radius of rare-earth element. After sintering at 2050°C, the liquid-phase viscosity significantly decreased, but volatilization became pronounced. The extent of β→α phase transformation and the grain size were affected by both liquid-phase viscosity and volatility. Larger grain size and higher affinity of rare-earth cations for oxygen anions contributed to reduce lattice oxygen content. The thermal conductivities of the SiC ceramics ranged from 192 to 229 W/mK. Notably, the SiC ceramic with Yb 2 O 3 -MgO additives exhibited the largest grain size, the lowest lattice oxygen content, and the elimination of β/α heterophase boundaries, thereby achieving the highest thermal conductivity of 229 W/mK.
研究领域:
材料科学
·
热传导工程
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DOI
高影响因子
Science China-Materials
·
2025
·
IF 7.4
Chen Haisheng,An Yu,Wang Yinghan,Du Xiaona,Hu Minghao,Bai Gongxun,Ye Shi,Liu Weiwei,Zhang Yang
Thermal quenching, a pervasive challenge in luminescent materials, severely limits the performance of lanthanide-based optical sensors at elevated temperatures. While negative thermal expansion (NTE) hosts have shown promise in bulk systems for countering this effect, their potential in thin-film architectures, critically for integrated photonics and miniaturized sensing, remains unexplored. Here, we demonstrate a Yb 3+ /Er 3+ co-doped Sc 2 Mo 3 O 12 thin film that leverages anisotropic NTE dynamics to achieve 42-fold thermal enhancement in green upconversion luminescence from 300 to 560 K. In situ thermodiffraction and time-resolved spectroscopy reveal a dual mechanism: (1) lattice contraction along the a - and c -axes reduces the cell volume of Sc 2 Mo 3 O 12 by 11.3 Å 3 , thereby amplifying Förster-type energy transfer ( k ET ∝ R −6 ) from Yb 3+ to Er 3+ , and (2) symmetry-breaking distortions suppress nonradiative 2 H 11/2 → 4 F 9/2 relaxations, extending Er 3+ lifetimes by 358%. Crucially, the film’s strain-engineered crystal field enables multi-modal thermometry with record sensitivities: a relative sensitivity ( S r ) of 4.33% K −1 at 300 K, and maximum S r = 1.28% K −1 through lifetime-based sensing, which outperforms conventional Boltzmann-limited approaches. The sub-200 nm thickness and SiO 2 /Si compatibility further position this platform for on-chip integration, addressing unmet needs in high-resolution thermal mapping for quantum devices, aerospace diagnostics, and wearable sensors. This work not only deciphers the interplay between NTE and luminescence at the atomic scale but also establishes a universal strategy to design anti-thermal-quenching thin films for extreme-environment photonics.
研究领域:
材料科学
·
光学
·
传感器技术
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DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Xiaokai Xu,Wei Li,Chaofan Hu,Bingfu Lei,Xuejie Zhang,Yadong Li,Qiuqiang Zhan,Yingliang Liu,Jianle Zhuang
In recent years, the application of nanomaterials in promoting plant growth and augmenting photosynthesis has aroused great interest. Herein, carbon dots (CDs) are combined with NaYF4:Yb,Er to achieve an enhanced upconversion red emission. The effects of the obtained NaYF4:Yb,Er@CDs nanocomposites on the growth of mung bean plants are investigated. It is found that an appropriate concentration of the NaYF4:Yb,Er@CDs nanocomposites (0.5 mg/mL) can enhance the water absorption ability of hydroponic mung beans and promote their growth after incubation for 7 days. Confocal imaging shows that the nanocomposites can transfer from the roots to the stems and leaves. Interestingly, after spraying the nanocomposite solution on the surface of the mung bean seedling leaves and placing them under sunlight for 2 weeks, the root/stem lengths and wet/dry weight clearly increase. Moreover, the photosynthetic rate of the mung bean seedling is found to increase by more than 2 times, while the transpiration rate and stomatal conductance are improved by 144 and 148%, respectively. Such a promoting effect is ascribed to the ability of the NaYF4:Yb,Er@CDs nanocomposites to convert near-infrared (NIR) radiation into red light, which is beneficial for plant photosynthesis. This work provides a promising strategy for promoting plant growth by the application of nanomaterials.
研究领域:
植物学
·
纳米生物学
·
农业科学
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DOI
高影响因子
Scientific Reports
·
2026
·
IF 4.9
Xiang Qingqing,Yu Rong,Huang Li,Liu Qingqing,Qin Nuo,Wang Li,Wu Yan,Fu Hang
Due to a lack of complete mechanistic understanding, there are no specific therapeutics for necrotizing enterocolitis (NEC), a deadly gastrointestinal disease affecting premature newborns. While sodium butyrate offers intestinal protection, its efficacy is strictly dose-dependent, and the underlying mechanisms regulating intestinal epithelial cell (IEC) survival remain elusive. Here, using neonatal murine NEC models and human IECs, we demonstrate that moderate-dose butyrate (50 mg/kg) significantly attenuates mucosal injury and improves survival, whereas high-dose butyrate (250 mg/kg) exacerbates mortality by inducing complex cell death pathways including necroptosis and ferroptosis. Mechanistically, moderate butyrate suppresses glycolysis and intracellular lactate production, which restores expression of the translational regulator PABPC1; PABPC1 then binds to YB-1 mRNA to enhance YB-1 protein synthesis without altering transcription. Elevated YB-1 subsequently binds BCL-2 mRNA, increasing BCL-2 protein levels to inhibit intrinsic mitochondrial apoptosis. Functional validation shows that YB-1 knockdown abolishes butyrate-mediated protection and exacerbates TNF-α-induced apoptosis, while YB-1 overexpression rescues cell viability, and exogenous lactate supplementation reverses these effects by suppressing the PABPC1-YB-1 axis. These findings elucidate a novel Lactate-PABPC1-YB-1-BCL-2 signaling axis through which butyrate safeguards the intestinal epithelium, highlighting precise dosing and the modulation of epithelial translational control as promising therapeutic strategies for NEC.
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DOI
PubMed
高影响因子
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