Nanomaterials
·
2026
·Vol. 16
·期 12
·745
·
IF 4.8
Xiumei Xu,Yi Zhou,Haijiao Zhang,Bao Wan,Yuhan Xu,Mengmeng Dai,Gui Wang,Gang Yang,Yongsheng Zhu
As a highly oxidizing and toxic gas, ozone (O3) poses significant hazards to human health and the environment even at low concentrations. Therefore, the development of ozone gas sensors that can operate stably at low temperatures while simultaneously exhibiting high response, fast response characteristics, excellent selectivity, and long-term stability remains a crucial challenge in the field of gas sensing. In this work, Pure In2O3and Yb-doped urchin-like hierarchical In2O3microspheres were successfully synthesized via a one-step hydrothermal method. The crystal structure, morphological features, elemental composition, and band structure of the as-prepared samples were systematically characterized by XRD, FESEM, TEM, HRTEM, XPS, and UV–vis spectroscopy. Gas-sensing tests demonstrated that Yb doping significantly enhanced the ozone-sensing performance of In2O3. Among all the samples, the 3%Yb-doped In2O3sensor exhibited the best response toward 1 ppm ozone at 40 °C, reaching approximately 1015, which was about 11 times higher than that of pristine In2O3. Meanwhile, the sensor showed a response time of 172 s. In addition, the 3%Yb-doped In2O3sensor exhibited good repeatability, excellent selectivity, and long-term stability. The excellent gas-sensing performance can be attributed to the electronic structure modulation and increased OV-related oxygen defect component induced by Yb doping, as well as the enhanced gas diffusion and interfacial reaction capability provided by the urchin-like hierarchical structure.
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DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Li Jun,Qi Chen,Wenhui Fu,Yaohua Yang,Wenqing Zhu,Jianhua Zhang
Enhancing the reliability and sensitivity of gas sensors based on FETs has been of extensive concern for their practical application. However, few reports are available on nanofiber FET gas sensors fabricated by the electrospinning process. In this work, ethanol gas sensors based on Yb-doped In2O3 (InYbO) nanofiber FETs are fabricated by a simple and fast electrospinning method. The optimized In2O3 nanofiber FETs with a doping concentration of 4 mol % show a better electrical performance, including a high mobility of 6.67 cm2/Vs, an acceptable threshold voltage of 3.27 V, and a suitable on/off current ratio of 107, especially the enhanced bias-stress stability. When employed in ethanol gas sensors, the gas sensors exhibit enhanced stability and improved sensitivity with a high response of 40–10 ppm, which is remarkably higher than that of previously reported ethanol gas sensors. Moreover, the InYbO nanofiber FET sensors also demonstrate a low limit of detection of 1 ppm and improved sensing performance ranging from sensitivity to the ability of selectivity. This work opens up a new prospect to achieve highly sensitive, selective, and reliable ethanol gas sensors using electrospun Yb-In2O3 nanofiber FETs with improved stability.
研究领域:
材料科学
·
纳米技术
·
传感器与探测器
·
电子器件
·
气体传感
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DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2016
·Vol. 23
·期 10
·2423-2431
·
IF 5.771
Yike Fu,Chao Fang,Zhaohui Ren,Gang Xu,Xiang Li,Gaorong Han
Light-responsive and photoluminescent (PL) drug-delivery platforms have sparked fascinating advancements in personalized tumor chemotherapy due to their unique characteristics in biological imaging and manipulated release kinetics. Herein, implantable Yb 3+ and Ho 3+ co-doped strontium titanate (SrTiO 3 :Yb,Ho) nanofibers were synthesized and decorated on the surface with polyacrylic acid (PAA) molecules. The preliminary in vitro assay confirmed that this implantable fibrous mesh presented sound cytocompatibility. The PAA surface decoration improved the loading capacity of an anticancer drug (doxorubicin (DOX)) and effectively prevented a daunting burst release in a neutral aqueous environment. Owing to the electrostatic bond between PAA and DOX molecules, low-pH microenvironments and NIR ( λ =808 nm) irradiation both induced significantly accelerated DOX release and consequently enhanced the local cancer-cell-killing effect. Additionally, the ratio of green-to-red emission ( I 545 / I 655 ) from the SrTiO 3 :Yb,Ho-PAA fibers responded effectively to the DOX release progress and dosage due to a fluorescence resonance energy transfer (FRET) effect. This unique characteristic enabled optical monitoring of the delivery progress in a timely manner. These SrTiO 3 :Yb,Ho-PAA nanofibers, with precise dual-triggering and optical monitoring of DOX release, are expected to serve as a new implantable drug delivery platform for personalized chemotherapy in the future. Graphical Rule with a rod : Implantable polyacrylic acid (PAA)-modified SrTiO 3 :Yb,Ho nanofibers were synthesized. Owing to electrostatic bonding between the PAA and DOX molecules (see figure), low pH and NIR ( λ =808 nm) irradiation both induced accelerated DOX release and consequently enhanced the local cancer-cell-killing effect. The ratio of green-to-red emission from the nanofibers responded effectively to the DOX release progress and enabled dosage monitoring.
研究领域:
材料科学
·
纳米医学
·
药物递送系统
·
生物医学工程
·
癌症治疗
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DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2013
·
IF 2.144
Suli Wu,Yanhui Ning,Jie Chang,Shufen Zhang
Here, hydro/solvent thermal method was applied to synthesize lanthanide doped NaYF 4 upconversion nanoparticles (UCNPs). In order to overcome the quenching effect of (CH 2 ) n due to their high energy stretching vibration , a series of new chelating ligands such as, butanoic acid , hexanoic acid , decanoic acid , and tetradecanoic acid were selected for hydrothermal synthesis of NaYF 4 :Yb, Er nanocrystals . For comparison, commonly used oleic acid was also used as ligand for hydrothermal synthesis of UCNPs. The effect of the carbon chain length of chelating ligands on the NaYF 4 nanocrystals’ emission intensity was systematically investigated. It was found that relative short length of the carbon chain in chelating ligands resulted in enhancement of luminescent intensity and modulation of the ratios of green to red (RGR) of NaYF 4 :Yb, Er nanocrystals. In contrast to the product prepared with oleic acid as ligand, the enhancement factors of 540 nm emissions were 25, 21, 6.5, and 3 for samples prepared with butanoic acid, hexanoic acid, decanoic acid, and tetradecanoic acid as ligands, respectively. The FT-IR spectra of NaYF 4 :Yb, Er UCNPs prepared with different ligands indicated that ligands with relatively short chain length indeed have weak IR absorption in 2800–2950 cm −1 , which resulted in weak quenching effect of Er 3+ . We also synthesized NaYF 4 :Yb, Tm UCNPs with these ligands. The results showed that chain length of ligands has similar effect on emission intensity of NaYF 4 :Yb, Tm. It is expected that this method can also be applied to enhance the luminescence intensity of other luminescent materials.
研究领域:
材料科学
·
光学
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产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2019
·
IF 2.961
Han Xia,Lei Lei,Jienan Xia,Youjie Hua,Degang Deng,Shiqing Xu
Non-contact optical thermometry based on fluorescence intensity ratio (FIR) technique has been widely researched over the past few decades. However, the reported systems exhibit two important shortcomings including the existence of a few interferential signals in addition to the required spectral bands for FIR and the absence of internal standard for reference signal. Herein, only two emission bands of Er 3+ : 4 F 9/2 → 4 I 15/2 (~673 nm) and Tm 3+ : 3 H 4 → 3 H 6 (~800 nm) are achieved in Yb/Er/Tm tri-doped Na 3 ZrF 7 nano-system. Moreover, the upconversion (UC) emission intensity of Er 3+ keeps unchanged with the rising of temperature, which is applied as reference signal; while that of Tm 3+ enhances evidently, which is applied as temperature signal. The calculated maximum absolute temperature sensitivity (S a ) and relative temperature sensitivity (S r ) are 0.17 K −1 at 393 K and 1.76% K −1 at 313 K, respectively.
研究领域:
材料科学
·
纳米技术
·
光学
·
温度传感
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产品关联
DOI
高影响因子
CRYSTAL RESEARCH AND TECHNOLOGY
·
2022
·Vol. 57
·期 7
·2100245
·
IF 1.599
Yihua Pan,Shoulei Xu,Siyao Li,Daini Wang,Yuhua Yang,Wenxia Wu,Bernard A. Goodman,Shengdi Ta,Wen Deng
Blue, green, and red emissions through upconversion and energy transfer processes are investigated as a function of the Tm 3+ concentration in Tm/Er/Yb triply doped yttria stabilized zirconia (YSZ) crystals upon excitation at 980 nm. YSZ doped with 0.075–0.250 mol% Tm 2 O 3 , 1.50 mol% Er 2 O 3 , and 2.00 mol% Yb 2 O 3 are prepared by the optical floating zone method, and confirmed to be in the cubic phase by X-ray diffraction. The blue emission corresponds to the Tm 3+ 1 G 4 → 3 H 6 transition, and is produced through a three-photon process, whereas the green and red light are emitted through two-photon processes from the Er 3+ 2 H 11/2 → 4 I 15/2 and 4 S 3/2 → 4 I 15/2 transitions for green and the Er 3+ 4 F 9/2 →4I 15/2 transition for red. However, interactions between the different lanthanide ions is a factor in determining the overall color of these triply doped crystals, and this is not simply a summation of the results from the singly doped systems, so this mechanism of energy transfer is discussed in detail. The CIE color chromaticity coordinates for the present samples under excitation at 980 nm approach (0.39, 0.55), which is in the yellow-green region.
研究领域:
材料科学
·
光学
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产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2020
·Vol. 22
·期 38
·6330-6338
·
IF 3.117
Chunyan Cheng,Yueshan Xu,Gejihu De,Jianxun Wang,Wei Wu,Yuexing Tian,Shasha Wang
Rare-earth doped upconversion nanoparticles (UCNPs) have attracted wide-ranging interest due to their potential applications in bioimaging and biolabeling, where a high emission intensity and small particle size are needed. However, common synthesis processes can be somewhat complex or require additional reactants, and the use of small-size NPs is limited by their weak luminescence intensity. In this work, uniform, monodisperse ∼5 nm β-NaGdF4:20% Yb/2% Er NPs were synthesized via a simple one-pot synthesis method in the high boiling-point solvents 1-octadecene (ODE) and oleic acid (OA) using a single dose of NaF at an ultralow NaF concentration of NaF/RE = 4. The effects of NaF/RE, the reaction temperature, and the reaction time on the size and phase of the particles were investigated. High-quality β-NaGdF4:20% Yb/2% Er@β-NaGdF4:20% Yb/10% Nd core–shell NPs with a size of ∼13 nm, enhanced UC luminescence, long UC lifetimes (τ) for green (τ ≈ 150 μs) and red (τ ≈ 105 μs) emission under 980 and 808 nm excitation, revealed via lifetime imaging, and obvious emission in the near-infrared (NIR) II region were synthesized. The synthesized core–shell NPs may result in a decrease in the overheating effect and allow for a deep penetration depth when further used for bioimaging applications. This work could inspire the synthesis of other high-quality RE-doped UCNPs via adding a single dose of a small amount of NaF and could lay the foundation for the use of Gd-based UCNPs in biomedical applications.
研究领域:
材料科学
·
生物医学工程
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DOI
高影响因子
Materials Today
·
2025
·
IF 22
Haiping Luo,Shenglan Zhou,Wenjie Deng,Jiahao Liu,Jiaqing Peng,Bo Li,Zhihua Xiong,Wei Wang,Xinyu Ye
Fe 3+ is a promising near-infrared (NIR) activator ion due to its tunable emission and non-toxicity, which has attracted growing interest. However, developing high-performance broadband NIR-emitting phosphors based on Fe 3+ remains a significant challenge. In this work, we present Fe 3+ -activated A 2 LuSbO 6 (A = Ba/Sr/Ca) double perovskite phosphors, which exhibit unusually long-wavelength NIR emission (>850 nm). By adopting a cation substitution strategy at the A-site, we designed the gradual replacement of large-radius ions with small-radius ions, achieving controllable tuning of emission from 847 nm to 937 nm. This substitution process simultaneously reduces structural symmetry and induces octahedral distortion, which breaks the spin-forbidden transition of Fe 3+ and enhances luminescence performance. However, the continuous emission redshift leads to a large Stokes shift, which suppresses Fe 3+ luminescence. The combined effect of these two factors results in optimal luminescence efficiency in Sr 2 LuSbO 6 :1.0 %Fe 3+ (SLSO) sample, with internal/external quantum efficiencies (IQE/EQE) of 94.8 %/54.5 %. To further enhance luminescence performance, we introduced the rare-earth Yb 3+ , establishing an efficient Fe 3+ →Yb 3+ energy transfer (ET) channel that reduces non-radiative transition losses. Compared with the Yb 3+ -free sample, the SLSO:1.0 %Fe 3+ , 3.0 %Yb 3+ sample exhibits a broadened FWHM from 115 nm to 180 nm, enhanced IQE and EQE of 98.1 % and 56.4 %, respectively, and 13 % improved thermal stability. Finally, a pc-LED device based on the SLSO:1.0 %Fe 3+ , 3.0 %Yb 3+ phosphor demonstrates potential for applications in NIR spectroscopy analysis, night vision, biomedical imaging, and other fields. This work lays a foundation for further research on strategies to regulation the optical properties of Fe 3+ -activated NIR phosphors.
研究领域:
材料科学
·
光学工程
·
生物医学成像
·
分子探针
·
转化医学
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产品关联
DOI
高影响因子
AIP Advances
·
2024
·Vol. 14
·期 5
·
IF 1.4
Liu Peng,Ren Weijun,Guo Qing,Zhang Zhao,Zhao Xueting,Zhang Zhidong,Dai Wei,Li Bing
Cryogenic refrigeration technology based on magnetocaloric effects plays a critical role in a variety of technological applications. In this paper, we report the cryogenic magnetocaloric effects of a series of sodium-rare earth fluoride samples (Ln = Gd, Tb, Dy, Ho, Er, Tm, Yb) synthesized by the solid-state reaction method. These compounds all crystallize in a hexagonal crystal structure. Down to 2 K, no magnetic ordering was detected, while all compounds show negative Curie–Weiss temperatures indicative of strong antiferromagnetic coupling. Magnetic fields effectively suppress the magnetic fluctuations, leading to a maximum magnetic entropy change of −56 J kg −1 K −1 in NaGdF 4 at the magnetic field change from 0 to 50 kOe. These series of compounds are potentially excellent magnetic refrigerants at low temperatures.
研究领域:
物理学
·
材料科学
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产品关联
DOI
高影响因子
Cell Reports Physical Science
·
2025
·
IF 7.3
Xiao-Kai Gong,Xiao-Song Zhang,Qian Li,Xing-Yao Zhao,Li-Na Kong,En-Ze Jin,Bao-Zeng Zhou,Jian-Ping Xu,Lan Li
Lead-free perovskites are becoming a focal point in the quest for non-toxic and stable materials for optoelectronic applications. Despite this interest, achieving blue light excitation from the lead-free halide double perovskite Cs 2 AgInCl 6 at room temperature remains a significant challenge, hindering their commercial viability. Here, we address this issue by synthesizing the rare earth lead-free double perovskite Cs 2 Ag 0.6 Na 0.4 In 0.8 Bi 0.2 Cl 6 :Yb, which demonstrates visible/near-infrared (NIR) light emission at 598 and 1,000 nm upon blue light excitation at room temperature. We show that this excitation stems from complex interactions between energy level splitting induced by Yb and self-trapped exciton energy levels. Notably, we observe that under blue excitation, the photoluminescence intensity increases with temperature. Furthermore, Cs 2 Ag 0.6 Na 0.4 In 0.8 Bi 0.2 Cl 6 :Yb is integrated into a blue-light-emitting diode, enhancing the conversion efficiency of GaAs solar cells as a down-shifting layer. Ultimately, this research opens new avenues for developing eco-friendly, efficient materials with significant implications for sustainable technology.
研究领域:
材料科学
·
光电子学
·
固态物理
·
无机化学
·
纳米技术
·
光子学
·
可再生能源
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2025
·
IF 26.8
Shuo Wang,Shuhan Zhang,Xin Li,Dan Huang,William W. Yu,Liang Wang
Near-infrared (NIR) emission underpins biomedical imaging, night vision, and optical communication. Yb 3+ -doped CsPbCl 3 have demonstrated ultrahigh photoluminescence quantum yields via quantum cutting, primarily enabled by a singular defect-assisted energy transfer pathway arising from the substitution of Pb 2+ by Yb 3+ . However, whether additional pathways exist to facilitate visible (VIS)-to-NIR conversion, thereby further enhancing the performance of NIR-emissive devices, remains an open and compelling question. Here, strategic engineering of localized bound excitons (BEs) is proposed in the thermally evaporated CsPbCl 3 :Yb system. Assisted BEs significantly promote energy transfer from CsPbCl 3 matrix to Yb dopants, unveiling a previously unknown excitonic energy transfer channel. Atomic-scale characterization combined with first-principles calculations uncovers a BE-driven excitonic transfer mechanism, specifically implicating Cs-vacancy-induced defects in mediating exciton behavior. These insights lead to the fabrication of high-performance NIR-LEDs with an 8.9% external quantum efficiency and 410 mW·Sr −1 ·m −2 radiance, marking a breakthrough in thermally evaporated NIR (>950 nm) light-emitting diodes.
研究领域:
光电子学
·
材料科学
·
钙钛矿发光二极管
·
能量转移物理
·
纳米材料
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产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2025
·Vol. 15
·期 13
·9899-9909
·
IF 4.6
Hanghang Zhang,Gang Xu
Copper-based catalysts are widely employed in the catalytic conversion of aromatic compounds to phenolic derivatives. However, single-atom copper catalysts often exhibit limited reactivity and stability. In this study, we addressed these limitations by loading Cu onto NaY zeolite via ion exchange to synthesize a CuY catalyst, followed by Yb modification. By optimizing the Yb content, we significantly enhanced the anisole conversion rate and guaiacol yield. Catalyst characterization revealed that Yb species modulate the electronic structure of copper, favoring the formation of abundant Cu+ species. This electronic modification promotes the catalytic generation of hydroxyl radicals (˙OH) from hydrogen peroxide, thereby accelerating the reaction kinetics. Furthermore, Yb incorporation into CuY induced the formation of oxygen vacancies, which improved hydroxyl radical adsorption and facilitated the generation of metal-oxo species. These synergistic effects collectively increased the reaction's overall conversion efficiency. Under optimized reaction conditions, the Yb/CuY catalyst achieved an anisole conversion of 56.2% and an ortho-selectivity of 74.6%, clearly outperforming previous reports.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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