Nanoscale Research Letters
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2013
·Vol. 8
·期 1
·1-8
·
IF 2.524
Zhou Na,Qiu Peiy,Wang Kan,Fu Hualin,Gao Guo,He Rong,Cui Daxiang
Water-soluble upconversion nanoparticles (UCNPs) were prepared by a one-pot procedure in a two-phase reacting system. Four kinds of surfactants were tested in the synthesis process as capping agent to tune size and morphology of nanocrystals. Nanoparticles (approximately 70 nm) and rods (400 nm and 2.5 μm) were synthesized, respectively. Then, Fourier transform infrared spectroscopy analysis confirmed the successful linking between UCNP surface and surfactant. Ionic liquids (ILs) and surfactants participated in synthesis process together, competing with each other to cap on UCNPs. ILs still led the competition of capping, while surfactants worked as cooperative assistants to develop functional surface. Further characterizations such as high-resolution transmission electron microscopy and X-ray diffraction indicated the changes in crystallization and phase transformation under the influence of surfactants. In addition, the growth mechanism of nanocrystals and upconversion fluorescence luminance was also investigated in detail. At last, the cytotoxicity of UCNPs was evaluated, which highly suggest that these surface-functionalized UCNPs are promising candidates for biomedical engineering.
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ELECTROCHIMICA ACTA
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2017
·
IF 4.798
Xiaoli Wang,Zhenlong Zhang,Jianqiang Qin,Wenjia Shi,Yuefeng Liu,Huiping Gao,Yanli Mao
In the present study, Er and Yb co-doped TiO 2 (Er-Yb:TiO 2 ) nanorod arrays were grown with a hydrothermal method , and perovskite solar cells were fabricated using them as an electron transfer material. The photovoltaic performance of the solar cells based on Er-Yb:TiO 2 was enhanced compared with that of solar cells based on un-doped TiO 2 . The power conversion efficiency of the solar cells on Er-Yb:TiO 2 increased to 13.4%, which is 20.8% higher than that of the solar cells based on un-doped TiO 2 . The experimental results indicate that the larger open circuit voltage could be due to the larger conduction band difference between Er-Yb:TiO 2 and perovskite material. The enlarged short circuit current could be attributed to the faster electron transfer, reduced recombination, and the upconversion of Er-Yb:TiO 2 NRs.
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ChemPhotoChem
·
2017
·Vol. 1
·期 8
·369-375
·
IF 0
Xuesong Zhai,Ying Wang,Xiaojuan Liu,Shihu Liu,Pengpeng Lei,Shuang Yao,Shuyan Song,Liang Zhou,Jing Feng,Hongjie Zhang
Graphical It′s all under control : Ultrasmall NaYF 4 :Yb,Er upconversion nanocrystals have been prepared by the simultaneous addition of two methanolic solutions of NH 4 F and NaOH into a rare-earth-salt precursor solution. A large number of hexagonal-phase seeds are quickly formed as a result of the low energy barrier, resulting in an ultrasmall particle size. Precise control over the size and crystallographic phase of nanocrystals allows the manipulation of their properties and applications as desired. Hexagonal-phase NaYF 4 (β-NaYF 4 ) upconversion nanocrystals with efficient luminescence are quite desirable for bio-applications, but synthetic control over the nanocrystallite size remains challenging. Herein we verify experimentally that control of the hexagonal-phase nucleation is crucial for controlling the final particle size and the number of hexagonal-phase seeds strongly depends on the actual F(Na):Y ratio. A negligible number of hexagonal-phase seeds were formed at low ratio whereas the high ratio yields a very large number of seeds. We also identify that the actual F(Na):Y ratio is more likely related to the different methods employed for the addition of NH 4 F and NaOH rather than its initial feeding ratio. By taking advantage of this dependence and varying the reaction conditions (temperature and time), β-NaYF 4 :Yb,Er nanocrystals with a size smaller than 6 nm can be synthesized. Theoretical modeling shows a good agreement with the experimental results.
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JOURNAL OF LUMINESCENCE
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2025
·
IF 3.6
Guangliang Lu,Yiping Zhang,Jianlian Song,Yuhan Jing,Xingyu Li,Rao Qin,Da Biao Zhai,Jiangang Jiang,Yiping Wang,He Wang
Traditional methods for latent fingerprint (LFP) detection often suffer from insufficient contrast and background interference, limiting their effectiveness in forensic applications, particularly in complex environments. This study introduces an innovative approach that combines Fe 3+ -doped NaYF 4 :Yb, Er upconversion nanoparticles (UCNPs) with digital image processing technology. By optimizing the Fe 3+ doping concentration (15 % mmol) and synthesis temperature (220 °C), the red emission intensity at 655 nm was enhanced by 13.96 times compared to undoped samples. The amplified red emission originates from energy transfer of | 2 F 7/2 , 4 T 1g ⟩ (Yb 3+ -Fe 3+ dimer) to 4 F 9/2 (Er 3+ ) states, coupled with crystalline field symmetry distortion induced by Fe 3+ codoping. Dynamic studies of 4 S 3/2 and 4 F 9/2 states under 980 nm pulsed laser excitation, alongside diffuse reflectance analysis, corroborate the proposed upconversion mechanism. Additionally, The optimized UCNPs demonstrated high biocompatibility and stability, achieving LFP visualization with contrast ratios up to 85.03 % and structural similarity scores exceeding 91.58 % via MATLAB-based digital image processing, a significant improvement over conventional methods. This work establishes a robust, non-toxic LFP detection system with potential applications in forensic science.
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Molecular Medicine Reports
·
2021
·Vol. 23
·期 4
·1-1
·
IF 2.952
Guang Chen,Gang Yu,Zheng Yong,Hui Yan,Ruibin Su,Huijun Wang
Drug addiction is a chronic and recurrent disease associated with learning and memory. Shaped by drug use and cues from the environment, drug memory serves a key role in drug‑seeking behaviour. Methamphetamine (MA), a globally abused drug, causes cognitive impairment, and endoplasmic reticulum (ER) stress is one of the mechanisms via which this occurs. In the current study, it was hypothesized that ER stress may serve a role in the disturbance of drug memory. The present study demonstrated that 5 mg/kg MA inhibited conditioned place preference behaviour via ER stress, which caused a disruption in long‑term potentiation in the hippocampus. When mice were pre‑treated with the ER stress inhibitors 4‑phenyl butyric acid or tauroursodeoxycholic acid, drug‑evoked synaptic plasticity was induced. Western blotting results indicated that treatment with 5 mg/kg MA enhanced the expression of cyclin‑dependent kinase‑5 and decreased the expression of Ca2+/calmodulin‑dependent protein kinase II α via ER stress. Collectively, the present results suggested that a large dose of MA inhibited drug‑evoked synaptic plasticity and disrupted drug memory by inducing ER stress.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Peng Wang,Shiqi Zhong,Ying Wang,Liyao Zou,Fangyuan Yu,Cong Lin,Mei Lin,Min Gao,Chunlin Zhao,Xiao Wu,Chao Chen
The pursuit of high-performance piezo-photocatalysts through structural modifications has been a focal point of investigation within the realm of related scientific disciplines. In this study, we successfully designed Er-doped Bi 0.5 Na 0.5 TiO 3 –BaTiO 3 combined with rare earth ion doping and solid solution modification, and the prepared particles exhibited homogeneous grain sizes and optimized concentrations of oxygen vacancies ( O V ). The synergistic incorporation of O V (accelerator for catalytic reaction) and Er 3+ results in an impressive 12-fold enhancement of the piezo-photocatalytic rate when degrading the Rhodamine B dye. The optimal composition 0.96BNT-0.04BT-Er demonstrates outstanding electrochemical properties , including a superior photocurrent response and minimal impedance, highlighting its exceptional performance in piezo-photocatalysis. The fundamental enhancement in catalytic performance can be attributed to the reconfiguration of the band structure of 0.96BNT-0.04BT-Er, which has been meticulously calculated utilizing DRS and VB-XPS and the internal mechanism was explained in detail. This research serves as a source of inspiration for the investigation of solid solutions among piezo-photocatalysts and sheds light on the vital role of band structure in governing catalytic performance.
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CATALYSIS LETTERS
·
2024
·
IF 2.3
Dong Wenjie,Cai Ao,Wu Sui,Qi Beimeng,Dai Zhixi
A porous Sn–Er–Beta zeolite catalyst was rapidly prepared by introducing Sn source with water bath method and Er source with solid-state ion exchange method. When adding 180 mg catalyst, 225 mg glucose and 10 mL water into a reaction kettle at 200 °C for 2 h, the yield of lactic acid can reach 71.2%. After being recycled 5 times, the lactic acid yield of the catalyst can still reach 45.3%. The physical and chemical properties of Sn–Er–Beta zeolite were characterized, and it was confirmed that the catalyst had a multi-stage pore structure, with Sn and Er elements existing in the zeolite skeleton. Among them, the increase of Lewis acidity, Brønsted acidity and special strong alkaline sites of Sn–Er–Beta zeolite caused by the introduction of Sn, and the Lewis acidic sites are further increased after the introduction of Er. The combination of Sn and Er obviously improves the catalyst’s capability to catalyze glucose and fructose to produce lactic acid. This provides an important reference value for the directional catalytic process of sugars. Graphical abstract
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Minerals
·
2025
·Vol. 15
·期 2
·153
·
IF 2.2
Kejia Ning,Jingzheng Wang,Li Zhang,Mengting Hong,Biao Fu,Jiushuai Deng,Xiahui Gui,Yaowen Xing,Guixia Fan,Hongxiang Xu
This systematic study was conducted on the separation of yttrium (Y) and erbium (Er) from a chloride medium using a mixed extractant system composed of [N1444][P507] and TRPO (trialkylphosphine oxide) in kerosene. This investigation focused on the effects of various extractants, extraction systems, the initial acidity of the aqueous phase, and the phase contact time on the extraction efficiencies of Y and Er. This study showed that using the combination of [N1444][P507] and TRPO notably increased the extraction performance and enhanced the separation factor between Y and Er, outperforming the individual use of P507 or [N1444][P507] under identical conditions. The extraction efficiencies for Y and Er reached 88.4% and 93.3%, respectively, with a separation factor (Er/Y) of 1.84, highlighting the system’s effectiveness in selectively isolating rare earth elements. Optimal stripping conditions were obtained using 0.1 mol/L of HCl, resulting in a successful recovery of 93.1% of Y3+and 78.9% of Er3+from the organic phase. The extraction mechanism involved both ion exchange and ion association. The enthalpy changes (ΔH) associated with the extraction of Y3+(−2.5 kJ·mol−1) and Er3+(4.6 KJ·mol−1) demonstrate that the extraction processes are exothermic, reflecting the thermodynamic differences between the two ions.
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TALANTA
·
2019
·
IF 4.916
Huihui Wang,Yunyun Lu,Lun Wang,Hongqi Chen
A selective, simple and environment-friendly type fluorescence sensing platform between upconversion nanoparticles (UCNPs) and melanin-like polymer utilizing the photoinduced electron-transfer (PET) mechanism was developed. The effective fluorescence quenching of UCNPs by melanin-like polymers could detect tyramine and tyrosinase (TYR) activity through the bio-catalysed oxidation of tyramine to the melanin-like polymer products. At optimal conditions, the range of linearity in detection was 0.167–33.3 μΜ for tyramine, and the limit of detection of tyramine was 0.026 μΜ. The linear range of TYR was 0.0033–1 U·mL −1 , and the limit of detection of TYR was 0.003 U·mL −1 . Furthermore, the strategy could be applied to real sample analysis with satisfactory results.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2020
·
IF 3.232
Hongqi Chen,Wen Wang,Changchun Ji,Lun Wang
The core–shell NaGdF 4 :Yb,Er@NaGdF 4 :Yb,Nd upconversion nanoparticles (UCNPs) were successfully obtained with the method of co-precipitation, and the water-solubility of UCNPs was improved by the ligand exchange reaction between nitrosyl tetrafluoroborate (NOBF 4 ) and nanoparticles. The IR-783 dye with negative charge and NOBF 4 -UCNPs with positive charge can bind together by electrostatic action to sensitize UCNPs through the energy transfer from IR-783 to UCNPs. However, with the presence of Na 2 S (a commonly used H 2 S donor), a highly selective reaction between H 2 S and IR-783, which destoried the structure of IR-783 and blocked the energy transfer, thus led to the quenching of luminescent intensity. Based on this, a sensing system for determination of H 2 S has been constructed successfully. The linear range of H 2 S detection by this system is 0.5–15 μM, and the detection limit is 34.17 nM. Furthermore, the dye-sensitized core–shell NaGdF 4 :Yb,Er@NaGdF 4 :Yb,Nd upconversion nanoprobe was applied to real sample analysis with satisfactory results.
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Inorganic Chemistry Frontiers
·
2025
·
IF 6.4
W. Y. Li,C. Y. Li,Z. H. Xu,W. B. Dai
Various optical signals are popularly harnessed to realize anticounterfeiting, encryption, and photoluminescence (PL)-based sensing. However, most phosphors can only achieve single PL output under a fixed excitation, thus simultaneous attainment of multimodal PL behaviors remains an imperative pursuit. Herein, a highly integrated multimodal photon-, temperature-, and mechanically responsive Sr2Ga2SiO7:Zn2+/Er3+/Pr3+(SGS:Zn/Er/Pr) is designed/synthesized via a facile solid-state reaction, endowing tunable down/up-converted (DC/UC) PL, mechanoluminescence (ML), and long-persistent PL (LPL) owing to the synergistic effects of self-activated and dopant-induced electronic transitions. serves as both an emitter and a trap center for the self-(L)PL located at ∼468 nm under λex = 267 nm. These behaviors are further optimized by adjusting the content of and by forming a bridge () between trap levels upon Zn2+ incorporation. The excitation and Zn2+ content-dependent PL can be modified from blue to cyan via conflating dual self-PL from the 4T1 → 4A1 transition of Ga3+ at ∼402 nm and . The green DC/red UC PL from Er3+is observed under λex = 357 and 980 nm, respectively. Nonequivalent substitution of Pr3+ at the Sr2+site and the incorporation of Zn2+ can adjust the charge transfer band energy level position and optimize the trap distribution, achieving long-term storage and highly repeatable/efficient LPL/ML generation. Based on abundant PL multimodes, the single-phased SGS:Zn/Er/Pr shows promising applications in sophisticated anticounterfeiting and latent fingerprint detection. Concurrently, owing to the coupled energy levels 2H11/2/4S3/2 of Er3+and the pressure-dependent ML of Pr3+, the SGS:Zn/Er/Pr is also suitably applied as a temperature/stress sensing agent.
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Scientific Reports
·
2017
·Vol. 7
·期 1
·1-8
·
IF 4.259
Chen Xu,Zhou Donglei,Xu Wen,Zhu Jinyang,Pan Gencai,Yin Ze,Wang He,Zhu Yongsheng,Shaobo Cui,Song Hongwei
Localized electric filed enhancement by surface plasmon resonance (SPR) of noble metal nanoparticles is an effective method to amplify the upconversion luminescence (UCL) strength of upconversion nanoparticles (UCNPs), whereas the highly effective UCL enhancement of UCNPs in colloids has not been realized until now. Here, we designed and fabricated the colloidal Au-Ag nanocage@NaYF 4 @NaYF 4 :Yb,Er core-shell hybrid with different intermediate thickness (NaYF 4 ) and tunable SPR peaks from visible wavelength region to NIR region. After the optimization of the intermediate spacer thickness (~7.5 nm) of NaYF 4 NPs and the SPR peak (~950 nm) of noble metal nanoparticles, an optimum enhancement as high as ~25 folds was obtained. Systematic investigation indicates that UCL enhancement mainly originates from the influence of the intermediate spacer and the coupling of Au-Ag nanocages with the excitation electromagnetic field of the UCNPs. Our findings may provide a new thinking on designing highly effective metal@UCNPs core-shell hybrid in colloids.
研究领域:
纳米光子学
·
等离激元学
·
发光材料
·
纳米复合材料
·
光学传感
·
生物光子学
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