Inorganic Chemistry Frontiers
·
2016
·Vol. 3
·期 8
·1082-1090
·
IF 4.532
Min Li,Xiaoyang Liu,Li Liu,Bing Ma,Benxian Li,Xudong Zhao,Wenming Tong,Xiaofeng Wang
A series of Yb3+/Tm3+ co-doped β-NaYF4 (β-NaYF4:Yb,Tm) crystals have been successfully synthesized via the molten salt synthesis (MSS) method. A unique strong green emission of Tm3+ was observed, which cannot be obtained by any other method. The red, green and blue (RGB) light emissions have been obtained simultaneously in the presence of a single activator (Tm3+). The influencing factors of crystal growth have been studied in detail, in order to understand the change of the transition probabilities of Tm3+. Subsequent studies indicate that the RGB light emissions of Tm3+ can be effectively tuned by varying the concentration of sensitizers (Yb3+ and Mn2+) and the reaction time. Consequently, the effective multicolor upconversion (UC) luminescence was obtained, especially a strong white light, which was not obtained in the β-NaYF4:Yb,Tm system earlier. To our knowledge, it is the first time that the UC properties in the β-NaYF4:Yb,Tm system have been investigated by altering the transition probabilities at the same energy level of Tm3+.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2017
·Vol. 47
·期 5
·1666-1673
·
IF 4.029
Yan Lv,Lin Yue,Qian Li,Baoyi Shao,Sen Zhao,Haitao Wang,Shijia Wu,Zhouping Wang
Herein, the design and synthesis of a multifunctional (Fe3O4-NaYF4:Yb,Tm)@TiO2 photocatalyst through a facile sol–gel process combined with electrostatic self-assembly has been reported. Particularly, as an upconversion sensor, NaYF4:Yb,Tm nanoparticles have the ability to convert near-infrared (NIR) light into ultraviolet (UV) emissions, so that the catalytic body TiO2 can indirectly utilize the NIR part of sunlight but not UV light. The excellent photocatalytic activity of the hybrid samples is evaluated using a model of the degradation of methylene blue (MB). Most importantly, the obtained materials exhibit remarkable magnetic properties because of the addition of a magnetic component (Fe3O4), therefore, the photocatalysts possess desired recyclability and reusability, which is significant for actual applications. Finally, the possible photocatalysis mechanism of the nanohybrids is discussed and hydroxyl radicals (OH˙) are confirmed as the main reactive species.
研究领域:
材料科学
·
环境科学
·
纳米技术
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS CHEMISTRY
·
2011
·Vol. 22
·期 3
·944-950
·
IF 5.101
Yuan Ren,Min Chen,Linfeng Hu,Xiaosheng Fang,Limin Wu
This paper presents an oil/water interface self-assembly strategy for the fabrication of hydrophobic nanoparticles into mono- and multi-layered nanofilms with NaYF4:Yb,Er nanoplatelets as a prototype. In this approach, hydrophobic β-NaYF4:Yb,Er nanoplatelets dispersed in chloroform solvent are used as the sub-phase, then a certain amount of water is added to produce a chloroform/water interface. When ethanol is added, the up-conversion NaYF4:Yb,Er nanoplatelets are found to readily self-assemble at the oil/water interface into a closely-packed mono- or multi-layer nanofilm with a preferred [001] orientation. Compared with the previous water/oil interface self-assembly strategy, the present method is not only used for fabrication of hydrophobic nanoparticles into high quality nanofilms, but also is environmentally friendly and is safe to the operator.
研究领域:
材料科学
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纳米技术
✓ 已验证
DOI
高影响因子
CRYSTENGCOMM
·
2018
·Vol. 20
·期 14
·1945-1953
·
IF 3.304
Kaimin Du,Xia Xu,Shuang Yao,Pengpeng Lei,Lile Dong,Manli Zhang,Jing Feng,Hongjie Zhang
Hexagonal phase (β-) NaYF4:Yb/Er upconversion (UC) microrods doped with Cu2+ ions were prepared via a facile solvothermal method. Simultaneous phase and shape control of NaYF4:Yb/Er crystals with enhanced upconversion luminescence (UCL) was successfully realized by codoping with Cu2+ ions. With an increasing Cu2+ ion concentration in the NaYF4:Yb/Er system, the crystal structure changed from a mixture of α- and β-phases to the pure β-phase and was converted into highly uniform microrods. As for the Cu2+ ion doped β-NaYF4:Yb/Er upconversion microrods, the maximum emission occurs with the sample added with 60 mol% Cu2+ ions and the UCL intensities of the green and red emissions were enhanced 37 and 25 times, respectively. Meanwhile, the possible mechanisms for the enhanced UCL of NaYF4:Yb/Er crystals were also discussed in detail. Moreover, the temperature dependent UCL properties of 60 mol% Cu2+ ion doped β-NaYF4:Yb/Er were studied under 980 nm excitation, which were temperature-sensitive over a wide temperature range from 123 K to 423 K. The change in UCL intensity influenced by temperature was discussed in detail.
研究领域:
材料科学
·
纳米技术
·
光学材料
·
稀土化学
·
生物医学成像
✓ 已验证
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2020
·Vol. 20
·期 3
·1866-1872
·
IF 1.134
Li Na,Tan Haihu,Xie Shaowen,Liu Simin,Tong Chao,Ouyang Min,Xu Lijian
Upconversion nanocrystals with uniform size and hydrophilic surface have potential applications in biological medical engineering. In this study, hydrophilic NaYF4:Yb, Er nanospheres were synthesized via hexadecylpyridinium chloride (CPC) mediated hydrothermal process. The
synthesized NaYF4:Yb, Er upconversion nanospheres (UCNSs) were characterized by various characterization methods. Results showed that the synthesized UCNSs exhibited a uniform sphere-like structure with average diameter of ~250 nm. The surface of UCNSs was captured by CPC molecule
indicating hydrophilic properties of UCNSs. The spherical UCNSs composed of mixed phase (α+β) NaYF4 nanocrystals. This is the novel study for synthesis of NaYF4:Ln3+ crystal employing CPC as ligand. Moreover, the effect of CPC concentration on
synthesis of UCNSs was investigated by comparatively studying morphology, crystal phase and luminescent properties of desired sample prepared under different experimental conditions. It was found that high concentrations of CPC ligands were more favorable for forming NaYF4 crystal
nanospheres with morphology that is more regular, have smoother surface, with higher crystallinity and better upconversion fluorescent properties. The possible growing mechanism was proposed and growing of NaYF4:Yb, Er nanospheres followed the classical Ostwald ripening process.
研究领域:
材料科学
·
生物医学工程
·
纳米技术
✓ 已验证
DOI
高影响因子
OPTICAL MATERIALS
·
2025
·
IF 4.2
Haoran Zhang,Tianxi Feng,Song Ye,Deping Wang
In this research, the modified upconversion nanocrystals NaYF 4 :Yb,Er were adopted as the precursors for the synthesis of the NaYF 4 :Yb,Er@UiO-66 composite. The XRD, XPS and TEM characterizations indicated that the composite has good crystallinity and uniform morphology. Under 980 nm excitation, the NaYF 4 :Yb,Er@UiO-66 composite exhibits bright upconversion emission that characterized of Er 3+ : 2 H 11/2 → 4 I 15/2 , 4 S 3/2 → 4 I 15/2 , and 4 F 9/2 → 4 I 15/2 radiative transitions. After modified with BPEI (branched polyethyleneimine), the NaYF 4 :Yb,Er@UiO-66/BPEI fluorescence probe was constructed and was used for the detection of Cu 2+ . The results revealed that the integrated emission intensity of Er 3+ displayed a linear relationship with the concentration of Cu 2+ within the range of 5 to 45 μM with a LOD of 0.9615 μM. This study offered a feasible method for constructing UCNC@UiO-66 composites with regular morphology,which may have a potential application as fluorescent probes for the detection of various metal ions by adjusting the doping luminescent center.
研究领域:
材料科学
·
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry B
·
2014
·Vol. 2
·期 38
·6626-6633
·
IF 0
Min Liu,Yuhang Ye,Cheng Yao,Wenbo Zhao,Xiaohua Huang
Chemiluminescence was used as an excitation light source to construct a universal photoelectrochemical platform based on Mn2+-doped NaYF4:Yb/Er upconversion nanoparticles, which greatly improves the electrochemiluminescence intensity and offers more stable cathodic signals compared to pure NaYF4:Yb/Er NPs. Here, we report for the first time the ECL behaviors of Mn2+-doped NaYF4:Yb/Er NPs, which were synthesized via a facile strategy. Mn2+ doping resulted in a 4-fold ECL intensity enhancement of NaYF4:Yb/Er. The characteristics of Mn2+-doped NaYF4:Yb/Er nanocomposites were obtained using transmission electron microscopy (TEM), energy dispersive X-ray spectrometer (EDS), and fluorescence spectra. After all the results had indicated that NaYF4:Yb/Er upconversion nanoparticles were successfully doped with Mn2+, the electrochemiluminescence platform was built. The as-prepared NaYF4:Yb/Er NPs were rendered water-soluble and then employed as ECL emitters for carcinoembryonic antigen (CEA) determination. The results indicated that the modified electrode can be used to determine CEA without interference from non-specific proteins, with a low detection limit of 5.2 pg mL−1. The biosensor can also be used for quantification of the CEA concentration in real samples.
研究领域:
生物医学工程
·
纳米医学
✓ 已验证
DOI
PubMed
Journal of Nanomaterials
·
2012
·
IF 1.376
Suli Wu,Yanhui Ning,Shufen Zhang
Novel chelating ligands are very significant for preparing nanocrystals with different morphologies and applications. In this paper, we directly introduced amine groups onto UCNPs by choosing a new chelating ligand tetraethylene pentamine (TEPA) to synthesis
N
a
Y
F
4
:Yb, Er through hydrothermal method. The influences of rare earth concentration, the ratio of RE/TEPA, solvent composition, and reaction time on the morphology and fluorescence intensity of the as-prepared
N
a
Y
F
4
:Yb, Er samples were systematically investigated and discussed. Field emission scanning electron microscopy (FE-SEM), powder X-ray diffraction (XRD), and upconversion luminescence spectroscopy were used to characterize the product. It was found that rare earth concentration, ratio of RE/TEPA, solvent composition, and reaction time were all responsible for the luminescent intensity and morphology.
研究领域:
材料科学
·
纳米技术
·
光学
✓ 已验证
DOI
高影响因子
Catalysts
·
2021
·Vol. 11
·期 2
·184
·
IF 4.146
Huang Zhou,Fengjiao He
β-NaYF4:Yb,Er,Gd fluorescent nanorods were successfully coupled to a reduced TiO2(UCNPs@R-TiO2) nanocomposite and applied to visible-light catalytic sterilization under 980 nm near-infrared (NIR) light illumination. The UCNPs (β-NaYF4:Yb,Er,Gd) absorb the NIR light and emit red and green light. The visible light can be absorbed by the R-TiO2(Eg = 2.8 eV) for the photocatalytic reaction. About 98.1% ofEscherichia coliwere effectively killed upon 12 min of NIR light irradiation at a minimum inhibitory concentration (MIC) of 40 μg/mL UCNPs@R-TiO2nanocomposite. The bactericidal properties were further evaluated by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) analysis. We found that the high bactericidal activity was due to the synergistic effect between the UCNPs and R-TiO2. Moreover, the UCNPs show excellent upconversion luminance properties, and the introduction of visible-light-absorbed R-TiO2nanoparticles (2.8 eV) was conducive to the efficient separation and utilization of photogenerated electron-hole pairs.
研究领域:
材料科学
·
微生物学
·
光化学
✓ 已验证
DOI
高影响因子
BIOSENSORS & BIOELECTRONICS
·
2013
·
IF 5.437
Hongqi Chen,Fei Yuan,Shaozhen Wang,Juan Xu,YiYan Zhang,Lun Wang
In this work, we design a FRET system for sensitive and selective determination of thrombin in red region, in which NaYF 4 :Yb,Er upconversion nanoparticles (UCNPs) act as donor and gold nanorods (Au NRs) act as acceptor. NaYF 4 :Yb,Er UCNPs with a strong emission at 661 nm were successfully synthesized by tuning the doped ions ratio. Carboxyl-functionalized NaYF 4 :Yb,Er UCNPs and Au NRs were then prepared and conjugated with the thrombin aptamers, respectively. The fluorescence emission band of NaYF 4 :Yb,Er UCNPs ( λ max =661 nm) highly overlaps with the absorption band of Au NRs( λ max =666 nm), which benefits from the large tunability of the spectrum band of Au NRs. A FRET system was then formed when thrombin was added to the mixture of NaYF 4 :Yb,Er UCNPs and Au NRs, which were both modified thrombin aptamers. The fluorescence quenching efficiency of NaYF 4 :Yb,Er UCNPs was increased in a thrombin concentration-dependent manner, which built the principle of thrombin quantification. The linear range was 2.5–90 nM in an aqueous buffer, and 3.75–112.5 nM in spiked human serum samples for thrombin. It also demonstrates a high selectivity to other biological species due to the specific binding. The measurement of thrombin in human plasma is satisfying, suggesting that the FRET system is of practical value in a complex biological sample matrix in red region.
研究领域:
分析化学
·
生物传感
·
纳米技术
·
分子生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2013
·Vol. 3
·期 33
·13915-13925
·
IF 2.562
Leyong Zeng,Lingchao Xiang,Wenzhi Ren,Jianjun Zheng,Tianhua Li,Bin Chen,Jichao Zhang,Chengwen Mao,Aiguo Li,Aiguo Wu
Due to non-invasive deep imaging and therapy, multifunctional agents of magnetic resonance (MR)/upconversion luminescence (UCL) imaging and photodynamic therapy (PDT) play an important role in clinical diagnosis and treatment of cancers, and also in the assessment of therapy effect. In this paper, tetra-sulfonic phthalocyanine aluminium (AlPcS4) photosensitizers-conjugated Fe3O4@NaYF4:Yb/Er (NPs-AlPcS4) nanocomplexes were synthesized for the T2-weighted MR/UCL imaging and PDT of cancer cells. The PEG-coated Fe3O4@NaYF4:Yb/Er nanoparticles (NPs) with a core–shell structure showed strong T2-weighted MR relaxivity (r2 = 42.131 mM−1 s−1) and UCL emission in the visible region (the bands at about 654–674 nm, 545 nm and 524 nm), and were conjugated successfully with AlPcS4 photosensitizer by electrostatic interaction. By direct observation of XFM and staining with Prussian blue, the element distribution and location of NPs in MCF-7 cells were characterized, respectively. Under irradiation from a 980 nm laser, the death ratio of MCF-7 cells incubated with NPs-AlPcS4 nanocomplexes could be up to about 70%. The results indicated that the as-prepared NPs-AlPcS4 nanocomplexes would be a potential candidate as multifunctional nanoprobes for the dual-modal T2-weighted MR/UCL imaging and PDT of cancers in the future.
研究领域:
生物医学工程
·
肿瘤学
·
材料科学
·
影像医学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 60
·37929-37937
·
IF 3.108
Yang Luo,Sinan Du,Wei Zhang,Zhengfang Liao,Fang Zuo,Shengtao Yang
Core@shell structures of Fe3O4@Mn2+-doped NaYF4:Yb/Tm nanoparticles (NPs) with multifunctional properties were prepared using a hydrothermal route with a seed-growth procedure. The effect of Mn2+ ions on the phase, shape, and upconversion luminescence (UCL) of Fe3O4@Mn2+-doped NaYF4:Yb/Tm NPs was explored using X-ray diffraction, transmission electron microscopy, dynamic light scattering, and photoluminescence spectroscopy. Furthermore, hydrophobic to hydrophilic surface modification of the Fe3O4@Mn2+-doped NaYF4:Yb/Tm NPs was achieved by coating the NPs with an amphiphilic polymer (poly(maleic anhydride-alt-1-octadecene) (C18PMH)) modified with amine-functionalized methyl ether poly(ethylene glycol). Then, the NIR-to-NIR UCL ascribed to the Tm3+ ions, T1-weighted MRI ascribed to the Mn2+ ions, and T2-weighted MRI ascribed to the Fe3O4 core of the hydrophilic Fe3O4@Mn2+-doped NaYF4:Yb/Tm NPs were evaluated. The results indicate that Mn2+ doping is an effective method to control the size/shape and improve the UCL intensity of Fe3O4@Mn2+-doped NaYF4:Yb/Tm NPs, which are promising as imaging agents for NIR-to-NIR UCL and T1/T2-weighted MRI in biomedical research.
研究领域:
生物医学工程
·
材料科学
·
影像医学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）