APPLIED SURFACE SCIENCE
·
2016
·
IF 3.15
Zhenli Qin,Sinan Du,Yang Luo,Zhijian Liao,Fang Zuo,Jianbin Luo,Dong Liu
We report the use of an efficient hydrothermal method to synthesize superparamagnetic and red luminescent bifunctional Fe 3 O 4 @Mn 2+ -doped NaYF 4 :Yb/Er nanoparticles (NPs) with core@shell structures via a seed-growth procedure. Oleic acid coated Fe 3 O 4 (OA-Fe 3 O 4 ) NPs were initially synthesized using a coprecipitation method. The as-synthesized OA-Fe 3 O 4 NPs were then used as seeds, on which the red upconversion luminescent shell (Mn 2+ -doped NaYF 4 :Yb/Er) was formed. Furthermore, hydrophobic to hydrophilic surface modification of the Fe 3 O 4 @Mn 2+ -doped NaYF 4 :Yb/Er NPs was achieved via a ligand exchange method where oleic acid was displaced by a PEG phosphate ligand [PEG = poly(ethylene glycol)]. These materials were characterized by means of transmission electron microscopy (TEM), X-ray diffraction (XRD), photoluminescence (PL) spectroscopy, and vibrating sample magnetometry (VSM). The Fe 3 O 4 cores were uniformly coated with a Mn 2+ -doped NaYF 4 :Yb/Er shell, and the bifunctional Fe 3 O 4 @Mn 2+ -doped NaYF 4 :Yb/Er NPs were monodispersed. Furthermore, the Fe 3 O 4 @Mn 2+ -doped NaYF 4 :Yb/Er NPs exhibited a saturated magnetization value of 6.2 emu/g and emitted red luminescence under a 980 nm laser. The obtained bifunctional Fe 3 O 4 @Mn 2+ -doped NaYF 4 :Yb/Er NPs may find potential applications in drug targeting, bioseparation, and diagnostic analysis. The synthetic method may be employed for the preparation of other bifunctional nanomaterials.
研究领域:
材料科学
·
纳米医学
·
生物成像
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2017
·
IF 4.162
Yaoyao Zhou,Bo Ling,Hongqi Chen,Lun Wang
A novel fluorescence method for the determination of hydrogen peroxide (H 2 O 2 ) and uric acid (UA) was developed. The procedure was based on the hydroxyl radicals (·OH), which effectively quenched the fluorescence of the Mn 2+ -doped NaYF 4 :Yb,Er upconversion nanoparticles (UCNPs). Based on the property of Mn 2+ -doped NaYF 4 :Yb,Er upconversion nanoparticles, the Fenton reaction and enzymatic reaction of uric acid, this method could be used for highly sensitive detection of H 2 O 2 and uric acid. Under optimal conditions, we observed that the fluorescence quenching signal showed good linearity with the H 2 O 2 concentration in the range of 3.00 × 10 -8 M ~ 6.00×10 -5 M, and the detection limit of this assay was 1.30×10 -8 M. Meanwhile, the linear concentration range for UA was 4.00 × 10 -9 M ~ 1.00×10 -5 M, and the lower limit of detection was 1.90×10 -9 M. Furthermore, the developed method was successfully used for the determination of UA levels in human serum with satisfactory results.
研究领域:
分析化学
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生物化学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
OPTICAL MATERIALS
·
2023
·
IF 3.9
Chunyang Kang,Xianwei Zuo,Lei Zhao,Cuiling Ren,Yan Wang,Yidan Liu,Xin He,Xin Li,Genliang Han
The red emission of upconversion nanoparticles (UCNPs) is located in an “optical window” range of the biological tissue, which has a promising prospect in biology application. In this work, novel red-emitting NaYF 4 :Yb 3+ /Er 3+ UCNPs with CH 3 COO − modifications were synthesized by single-mode focused microwave method. The morphology, structure, and luminescence properties of as-prepared UCNPs were characterized. The results showed that single-mode focused microwave method was an effective approach to prepare hydrophilic and strongly red emission UCNPs within a drastically reduced reaction time (only 10 min) compared to the traditional methods. Importantly, we also demonstrated that the CH 3 COO − modified NaYF 4 :Yb 3+ /Er 3+ UCNPs could be successfully applied for in vitro imaging of HeLa cells. This work not only provides a rapidly synthetic methodology for the preparation of red-emitting UCNPs but also offers an effective material for cancer cell imaging .
研究领域:
材料科学
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纳米技术
·
生物医学工程
·
细胞生物学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Wei Gao,Peng Ding,Jiaxi Li,Xingyun Gao,Chengyun Zhang,Xuewen Yan,Qingyan Han,Jun Dong
Localized surface plasmon resonance (LSPR) in noble-metal nanostructures is a powerful strategy for enhancing upconversion (UC) emission from rare-earth-dopants. Herein, we present a distance-engineered Au–NaYF 4 core shell (CS) platform that selectively amplifies multicolor UC emission by jointly tuning the diameter of Au nanoparticles (NPs) and the thickness of an inert NaYF 4 spacer. Under 980 nm excitation, 56 nm Au NPs generate optimal near-field enhancement, yielding 6.82-fold (Er 3 + , 654 nm) and 5.61-fold (Tm 3+ , 450 nm) increases, respectively, in comparison to NaYF 4 : 20 %Yb 3+ /2 %Ho 3+ @NaYbF 4 : 2 %Er 3+ and NaYF 4 : 20 %Yb 3+ /2 %Ho 3+ @NaYbF 4 : 2 %Er 3+ @NaYF 4 : 20 %Yb 3+ /2 %Tm 3+ CS NPs. Power- dependent and time-resolved measurements attribute the gain to excitation-rate enhancement–an increased Yb 3+ absorption cross section–with negligible modulation of radiative rates. Finite-element simulations reveal intense gap “hot spots” for 56 nm Au NPs that account for the optimum. These results establish a simple distance–size design rule for spectrally selective, intensity-tunable UC emission, enabling compact plasmonic platforms for bioimaging, anti-counterfeiting and nanoscale optoelectronics.
研究领域:
纳米光子学
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等离激元学
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材料科学
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光学材料
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 5
·6269-6282
·
IF 2.478
Chen Zhangxu,Fu Minglian,Zheng Bingyun,Zhu Danchen,Chen Zefan
The influencing factors of chelator, reaction times, and Yb 3+ /Tm 3+ -doped concentration on the formation of NaYF 4 :Yb,Tm crystals with various morphologies have been investigated and determined. It is found that NaYF 4 :Yb,Tm with various morphologies and different phases can be tuned. Compared with the addition of ethylene diamine tetra acetic acid, hexagonal nanoprism-like β-NaYF 4 :Yb,Tm with a mean length of ~ 1300 nm and diameter of ~ 100 nm is prepared in the presence of oleic acid, which preferentially orients along with the [0001] direction more quickly than others. Systematical research on the emission of Yb 3+ /Tm 3+ -doped NaYF 4 crystals with microrod, hexagonal microprism, and nanoplate has implied that these obtained crystals with unique optical properties are closely related to their morphologies, phases, and sizes. In addition, a possible growth mechanism of co-existence of α- and β-NaYF 4 phases is proposed. It can be expected to illustrate the formation mechanism for the upconversion crystals or other rare-earth upconversion materials and to import these highly luminescent microcrystals or nanocrystals to environmental remediation by full solar energy spectra.
研究领域:
材料科学
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纳米技术
·
光学材料
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Chinese Physics B
·
2018
·Vol. 27
·期 9
·097301
·
IF 1.321
Ang Li,Jin-Lei Wu,Xue-Song Xu,Yang Liu,Ya-Nan Bao,Bin Dong
The W18O49 nanoflowers with a diameter of 500 nm are prepared by a facile hydrothermal method. The Er–Yb: NaYF4 nanoparticles are adsorbed on the petals (the position of the strongest local electric field on W18O49 nanoflowers). With a 976 nm laser diode (LD) as an excitation source, the selectively green upconversion luminescence (UCL) is observed to be enhanced by two orders of magnitude in Er–Yb: NaYF4/W18O49 nanoflowers heterostructures. It suggests that the near infrared (NIR)-excited localized surface plasmon resonance (LSPR) of W18O49 is primarily responsible for the enhanced UCL, which could be partly reabsorbed by the W18O49, thus leading to the selective enhancement of green UCL for the Er–Yb: NaYF4. The fluorescence intensity ratio is investigated as a function of temperature based on the intense green UCL, which indicates that Er–Yb: NaYF4/W18O49 nanoflower heterostructures have good potential for developing into temperature sensors.
研究领域:
材料科学
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光学
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纳米技术
·
温度传感
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry B
·
2023
·Vol. 11
·期 24
·5565-5573
·
IF 7
Xuran Zhang,Jianfei Ding,Liang Zou,Huihui Tian,Ying Fang,Jinfen Wang
Near-infrared optogenetics based on up-conversion materials provides a promising tool for the dissection of neural circuit functions in deep brain regions. However, it remains a challenge to combine near-infrared up-conversion optogenetic stimulation with high-density electrophysiological recording in a minimally invasive manner. Here, we develop a flexible device for simultaneous electrophysiological recording and near-infrared optogenetics. The flexible device is constructed by integrating polymer-based flexible recording microelectrodes with electrodeposited NaYF4:Yb3+, Er3+ up-conversion films that can convert deep-tissue-penetrating near-infrared light into visible light for optogenetic activation of C1V1-expressing neurons. The emission properties of the up-conversion films are optimized for green light emission to stimulate C1V1 opsins. Owing to their minimized surgical footprint and high mechanical compliance, chronically implanted devices enable simultaneous electrophysiological recording and near-infrared optogenetic modulation of neuronal activities in the brain.
研究领域:
神经科学
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光遗传学
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材料科学
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生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2021
·
IF 6.789
Ying Zhang,Yujie Luo,Shiqi Fu,Xiulong Lv,Qian He,Fangying Ji,Xuan Xu
UVC (wavelength < 280 nm) has a wide range of applications in the field of water disinfection due to its excellent bactericidal performance. In this work, we synthesized an upconversion luminescent material, β-NaYF 4 : Pr 3+ , Li + (NYF), which can generate UVC, and compounded it with a BiOCl photocatalyst to synthesize β-NaYF 4 : Pr 3+ , Li + @BiOCl (NYF-Bi) with a core-shell structure. The NYF-Bi composite material can be driven under visible light and has high photocatalytic activity . The bactericidal performance of NYF and NYF-Bi were evaluated using Escherichia coli , Staphylococcus aureus , Shigella and Salmonella . The NYF-Bi composite material killed 99.99% of E. coli under visible light (λ ≥ 420 nm) within 180 min and maintained high germicidal efficacy after 4 cycles. Finally, we deduced the sterilization mechanism of the NYF-Bi composite material through carrier dynamics studies and catching agent experiments. The death of bacteria was mainly caused by UVC light and active species , including h + , OH, and O- 2. This research provides a new material for water disinfection.
研究领域:
环境科学
·
材料科学
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
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
MATERIALS RESEARCH BULLETIN
·
2022
·
IF 5.6
Huazhen Liao,Song Ye,Jingxin Ding,Jianzhong Yu,Xinling Xv,Ling Pan,Peixuan Lin,Deping Wang
Enabling the drug delivery systems with drug release monitoring function is of essential importance to enhance therapeutic effectiveness. Herein, we took a ship-in-a-bottle synthesis strategy to construct the upconversion nanocrystal and zeolite compounded drug delivery system with real-time monitoring function, by using desilicated ZSM-5 zeolite as drug carrier and NaYF 4 : Yb 3+ /Tm 3+ nanocrystal as luminescent probe. Benefiting from the enlarged mesoporous in desilicated ZSM-5, the NaYF 4 : Yb 3+ /Tm 3+ nanocrystals can be successfully loaded inside and the upconversion emission intensity of Tm 3+ under 980 nm excitation was one order of magnitude enhanced after mild heat treatment. The drug release monitoring function were studied by using doxorubicin as model drug, the experimental results indicated that the upconversion emission intensity ratio of I 802nm /I 475nm can accurately evaluate drug release percentage. Further in vitro cytotoxicity evaluation suggested the doxorubicin-loaded [email protected] /DS/HT has excellent biocompatibility and is able to inhibit tumor cells effectively.
研究领域:
材料科学
·
纳米技术
·
药物递送系统
·
生物医学工程
✓ 已验证
DOI
高影响因子
Materials Express
·
2023
·Vol. 13
·期 11
·1915-1921
·
IF 0.7
Chen Sihan,Hu Huiqi,Jiang Wenting,Zhang Yuyun,Luo Xiaohu,Peng Jiayi,Li Le,Zhen Deshuai,Wang Hanqing
A novel near-infrared induced upconversion sensor for the detection of uranyl ions was successfully constructed using β-NaYF4: Yb, Tm, Gd upconversion nanoparticles (UCNPs) and specific DNAzyme. Characterization of the UCNPs@DNAzyme was conducted using XRD, TEM, FT-IR and
fluorescence testing, and it was shown that the β-NaYF4: Yb, Tm, Gd nanoparticles were successfully prepared (∼27 nm). Upon 980 nm excitation, the UCNPs@DNAzyme emitted green light at λ=475 nm. Furthermore, Förster resonance energy transfer was observed between
the UCNPs@DNAzyme (doner) and uranyl (acceptor) present on the substrate chain. This resulted in fluorescence quenching, which was used to quantify the concentration of uranyl. The developed method was found to be highly selective and sensitive, with a detection limit as low as 43 nM. This
method also demonstrated excellent specificity and sensitivity for the determination of uranyl in water samples, indicating its potential application in near-infrared fluorescence detection and imaging of uranyl in vivo.
研究领域:
分析化学
·
材料科学
·
环境科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Lele Qiu,Yulin Yang,Guohua Dong,Debin Xia,Mengru Li,Xiao Fan,Ruiqing Fan
As for the solution-processed MAPbI 3 film, the pinholes and gaps are an inevitable and undesirable phenomenon, which can usually lead to serious interface charge recombination due to the penetration of hole transport materials in perovskite solar cells (PSCs). Herein, a hydrophobic β-NaYF 4 :Yb,Er up-conversion ultrathin layer with particle size ca. 6 nm was first applied to modify the MAPbI 3 film for optimizing the surface of perovskite film. Thereby, the corresponding PSCs yield a significantly enhanced power conversion efficiency of 15.17% compared with that (13.32%) of the pristine PSCs. Furthermore, the PSCs also have a good stability in air atmosphere (relative humidity ≤45%) because of the introduction of this hydrophobic material. After a series of detailed investigations and comparison, it can be easily concluded that the filled pinholes and gaps in perovskite films via β-NaYF 4 :Yb,Er nanoparticles is the main reason for the performance enhancement of the β-NaYF 4 :Yb,Er based PSCs, which can result in an enhanced hole extraction efficiency and reduced interface charge recombination. As a conclusion, it is a feasible and effective approach for improving the photovoltaic performance of PSCs by filling up the pinholes and gaps in perovskite films with up-conversion ultrathin layers.
研究领域:
材料科学
·
能源科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）