RESEARCH ON CHEMICAL INTERMEDIATES
·
2018
·Vol. 44
·期 10
·6369-6385
·
IF 1.674
Chen Zhangxu,Fu Ming-Lai,Huang Xiao-Dan,Yuan Baoling,Yang Jia-Cheng E.
To enhance photocatalytic activity spectra area of the TiO 2 based photocatalyst, and to separate and recycle photocatalyst easily, magnetic photocatalyst was prepared with β-NaYF 4 :Yb 3+ ,Tm 3+ , TiO 2 , Fe 3 O 4 as carriers, and tetraethyl orthosilicate as precursor. The magnetic infrared responsive photocatalysts were thoroughly characterized by field emission scanning electron microscopy, X-ray diffraction, a fluorescence spectrometer and UV–Vis–NIR diffuse reflectance spectroscopy. They showed that the composite of β-NaYF 4 :Yb 3+ ,Tm 3+ /TiO 2 /Fe 3 O 4 @SiO 2 (UCTFS) emits visible luminescence upon 980 nm excitation, and energy transfer from β-NaYF 4 :Yb 3+ ,Tm 3+ to TiO 2 was verified. The photocatalytic activities of the UCTFS were studied by orthogonal experiments for photodegradating methylene blue (MB). The degradation rate of MB can reach 86.69% under the optimal conditions. After the four recycles, the degradation rate remained 52.72%. It also showed that 50.27% of the degradation efficiency of phenol can be obtained under the same experimental parameters. These results suggest that magnetic UCTFS composite is stable and a magnetic NIR-driven photocatalyst for degradation of organic pollutants. Moreover, the NIR driven photocatalytic mechanism of this reported composite was proposed. The strategy suggested here may be indicated for the effective fabrication of magnetic NIR-driven photocatalyst for application in the water purification by full spectra of solar energy.
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高影响因子
Catalysis Science & Technology
·
2025
·
IF 4.2
Dongfang Han,Li Niu,Yuangong Ma,Youlin Huang,Wen-Sheng Zhang
To utilize near-infrared (NIR) light within the solar energy spectrum, we have engineered an advanced composite of NaYF4:Yb3+,Tm3+@g-C3N4@WO3@MXene (denoted as NYT@g-C3N4@WO3@MXene) capable of absorbing NIR light to facilitate photocatalytic reactions. This environmentally benign system integrates semiconductor heterostructures (g-C3N4 and WO3) with upconversion nanoparticles (NaYF4:Yb3+,Tm3+, abbreviated as NYT) and Ti3C2 MXene nanosheets. Experimental validation demonstrated exceptional performance in antibiotic remediation, with the composite achieving 86.3% tetracycline decomposition over 12 hours under NIR irradiation through synergistic mechanisms, while also exhibiting good cycling stability. The enhanced photocatalytic activity arises from collaborative effects between upconversion luminescence, optimized charge transfer pathways within the heterojunction architecture, and the visible light absorption characteristics of MXene.
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Journal of Materials Chemistry C
·
2016
·Vol. 4
·期 26
·6327-6335
·
IF 5.066
Weijing Yao,Qingyong Tian,Jun Liu,Zhaohui Wu,Shuyuan Cui,Jin Ding,Zhigao Dai,Wei Wu
Up-conversion materials can be applied in anti-counterfeit fields because of their high concealment and high up-conversion fluorescence efficiency. Herein, different lanthanide ions-doped β-NaYF4 up-conversion micro-particles (UCMPs) with uniform hexagonal morphology were synthesized on a large-scale (more than 0.5 g) via a facile hydrothermal method. It is very interesting to find out the fluorescence intensity and the eventual morphology of the UCMPs were highly dependent on the reaction conditions. Then, the optimal UCMPs with uniform morphology and strong fluorescence intensity were selected as promising candidates for preparing ink. Eventually, we successfully printed designable and multicolor fluorescent patterns on flexible substrates (common paper and polyethylene terephthalate, PET) using the as-prepared β-NaYF4:Yb3+,Tm3+/Er3+/Eu3+ UCMPs inks. Under ambient conditions, the printed patterns on conventional paper are invisible, while such printed patterns on PET are white. However, all the patterns could display blue, yellow-green and green fluorescence patterns under the irradiation of a 980 nm laser when using the β-NaYF4:Yb3+,Tm3+/Er3+/Eu3+ UCMPs inks. We envision that the UCMPs fluorescent inks-based flexible and rapid screen printing patterns have enormous potential for anti-counterfeit and security applications.
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高影响因子
ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Jiwei Liang,Huiping Gao,Mengji Yi,Wenjia Shi,Yuefeng Liu,Zhenlong Zhang,Yanli Mao
β-NaYF 4 :Yb 3+ , Tm 3+ @ TiO 2 core-shell upconversion nanoparticles (UCNPs) were synthesized and incorporated into the TiO 2 mesoporous layer of perovskite solar cells (PSCs). Changes of the upconversion spectra of the UCNPs suggest the existence of the electron injection from NaYF 4 :Yb 3+ , Tm 3+ to the conduction band (CB) of TiO 2 through the NaYF 4 :Yb 3+ , Tm 3+ /TiO 2 nano-heterojunctions. The core-shell UCNPs that incorporated into the TiO 2 mesoporous layer not only act as the upconversion centers to use the NIR light but also serve as the light scatter centers to enhance the light harvesting. When using mesoporous layer containing the core-shell UCNPs in PSCs, the efficiency of the best devices is 16.27%, which is about 16.38% higher than that of the devices without core-shell UCNPs (13.98%). The significant enhancement in the performance of the PSCs is attributed to light scattering, NIR light upconversion and electron injection from the UCNPs to the CB of TiO 2 .
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Journal of Materials Chemistry C
·
2017
·Vol. 5
·期 37
·9770-9777
·
IF 5.256
Shaohua Fan,Guojun Gao,Dmitry Busko,Zhiquan Lin,Shikai Wang,Xue Wang,Shiyu Sun,Andrey Turshatov,Bryce S. Richards,Hongtao Sun,Lili Hu
Monodisperse β-NaYF4:Yb3+,Tm3+ (NYF) hexagonal microplates with efficient near-infrared (NIR)-to-NIR up-conversion (UC) developed via a new ion-exchange modified hydrothermal method are reported. Ion exchange modification (IEM) not only significantly increases the UC intensity by up to 1000 times and prolongs the emission lifetimes of Tm3+ and Yb3+, but also enables the monodisperse morphology and size of hexagonal microplates to be maintained. A high UC quantum efficiency (QE) of 3.1% is obtained for IEM β-NaYF4:20%Yb3+,1%Tm3+ when excited with 980 nm light at a power density of 10 W cm−2. The UC emission properties can be finely tailored by changing the NaF/NYF molar ratio (NYF represents lanthanide doped β-NaYF4) and the doping concentration of Tm3+. The two photon NIR UC emission centered at ∼803 nm (arising from Tm3+: 3H4 → 3H6) dominates the UC emission spectrum and high concentrations of Tm3+ favor NIR UC further. A proof-of-concept optical image of printed patterns is demonstrated to verify their applications in security. These results suggest the promising applications of the newly developed monodisperse β-NaYF4:Yb3+,Tm3+ hexagonal microplates in security, luminescent labels, solid-state lasers, amplifiers, and biomedicine.
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PHYSICA B-CONDENSED MATTER
·
2021
·
IF 2.436
Yang Yu,Sai Xu,Muhan Jiang,Ruixin Song,Jie Li,Yuefeng Gao,Xizhen Zhang,Xiangping Li,Hongquan Yu,Baojiu Chen
Upconversion core-shell nanoparticles with dual-function of temperature sensing and photothermal conversion are preferable in diagnose and treatment of cancer. Herein, NaYF 4 :Tm 3+ /Yb 3+ @NaYF 4 :Sm 3+ /Yb 3+ upconversion nanoparticles have been synthesized by a high-temperature thermal decomposition method. XRD and TEM are used to characterize the crystal structure and morphology of the samples. Temperature dependent upconversion spectra are measured under excitation of 980 nm within the scope of 303–498 K. The investigation on temperature sensing properties are on the basis of the luminescence intensity ratio of Tm 3+ . The designed core shell nanoparticles and bare core nanoparticles both have good temperature sensing performances, and the sensing properties of both are similar. Furthermore, the photothermal conversion performances are investigated ground on the power dependent temperature measurement, ethanol evaporation experiment and visual infrared thermal images. It is found that the photothermal conversion ability of the core-shell UCNPs is greatly improved by coating of the NaYF 4 : Sm 3+ /Yb 3+ outer shell.
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高影响因子
Materials Science & Engineering C-Materials for Biological Applications
·
2016
·
IF 3.42
Huiqiong Yan,Xiuqiong Chen,Jia Shi,Zaifeng Shi,Wei Sun,Qiang Lin,Xianghui Wang,Zihao Dai
The rare earth ion doped upconversion nanoparticles (UCNPs) synthesized by hydrophobic organic ligands possess poor solubility and low fluorescence quantum yield in aqueous media. To conquer this issue, NaYF 4 :Yb 3 + /Tm 3 + UCNPs, synthesized by a hydrothermal method, were coated with F127 and then assembled with chitosan to fabricate the chitosan/NaYF 4 :Yb 3 + /Tm 3 + composite beads (CS/NaYF 4 :Yb 3 + /Tm 3 + CBs) by Pickering emulsion system. The characterization results revealed that the as-synthesized NaYF 4 :Yb 3 + /Tm 3 + UCNPs with an average size of 20 nm exhibited spherical morphology, high crystallinity and characteristic emission upconversion fluorescence with an overall blue color output. The NaYF 4 :Yb 3 + /Tm 3 + UCNPs were successfully conjugated on the surface of chitosan beads by the gelling of emulsion droplets. The resultant CS/NaYF 4 :Yb 3 + /Tm 3 + CBs showed good upconversion luminescent property, drug-loading capacity, release performance and excellent biocompatibility, exhibiting great potentials in targeted drug delivery and tissue engineering with potential tracking capability and lasting release performance.
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PubMed
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.
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高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2019
·
IF 2.291
Ping Xiao,Song Ye,Huazhen Liao,Yanling Shi,Deping Wang
The ability to increase the emission intensity and turn the emission color of upconversion nanocrystals (NCs) will greatly enhance their application scopes. In this research, the sub-10 nm pure β-NaYF 4 : Yb 3+ /Tm 3+ /Ho 3+ core NCs were prepared by using sodium oleate (NaOA) as sodium source instead of the traditional NaOH, based on which the β-NaYF 4 :Yb 3+ /Er 3+ @NaYF 4 core-shell NCs were successfully obtained with seed-mediated growth method. The spectral measurement and the calculated CIE color coordinates revealed that the growing of inert NaYF 4 shell on the active NaYF 4 : Yb 3+ /Tm 3+ /Ho 3+ core NCs can not only effectively increase the upconversion emission intensity, but also realize extended tunable emission from blue to orange by turning Ho 3+ concentration, and a strong white light emission with chromaticity coordinates of (0.32, 0.33) can be obtained in the NaY 0.77 F 4 :0.2Yb 3+ /0.01Tm 3+ /0.02Ho 3+ @NaYF 4 core-shell NCs. Furthermore, the extended color tunability and efficient white white-light generation in the core-shell NCs were demonstrated by NCs-PMMA nanocomposites under 980 nm excitation. The results suggested that the β-NaYF 4 :Yb 3+ /Er 3+ @NaYF 4 core-shell NCs have promising applications in optoelectronic devices such as light emitting diode and three-dimensional display.
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BIOMATERIALS
·
2014
·
IF 8.312
Ao Xia,Xiaofeng Zhang,Jun Zhang,Yunyun Deng,Qiang Chen,Shishan Wu,Xiaohua Huang,Jian Shen
Dual-modality imaging with magnetic resonance (MR) and upconversion luminescence (UCL) is a promising technique for molecular imaging in biomedical research. Multifunctional lanthanide-based nanoparticles have been widely investigated as agents for contrast enhanced MR and fluorescence imaging. However, the use of rare earth fluoride nanoparticles for dual-modality imaging of T2-weighted MR and UCL is rarely reported. We find that NaYF 4 :Yb 3+ ,Tm 3+ ,Co 2+ (MUC) nanorods can be applied as a high-performance dual contrast agent for both T2-weighted MR and UCL dual-modality imaging. After modification with 6-O-carboxymethyl chitosan (OCC), MUC nanorods can be endocytosed by cells without showing signs of cytotoxicity. High-quality UCL images of living cells incubated with MUC-OCC nanorods were acquired on a near-infrared (NIR) confocal microscopy under the excitation at 980 nm. Moreover, MUC-OCC nanorods display high transverse (r2) relaxivities in vitro . The application of low-dose MUC-OCC nanorods for NIR-to-NIR UCL and MR dual-modality in vivo imaging was also carried out successfully. In addition, the toxicity of MUC-OCC nanorods was evaluated by MTT assay , serological tests and histological analysis of visceral organs.
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PubMed
高影响因子
CRYSTENGCOMM
·
2022
·Vol. 24
·期 27
·4887-4898
·
IF 3.756
Mingzhou Meng,Rui Zhang,Zhenlong Cheng,Xinmeng Fa,Jianghua Yang,Anees A. Ansari,Jun Ou,Christian Wurth,Ute Resch-Genger
A solvothermal method was used to prepare a series of Yb3+/Tm3+/Ca2+ co-doped NaYF4 nanoparticles with different Ca2+ contents. Strong upconversion blue fluorescence could be observed under 980 nm laser excitation of the samples. The effect of different Ca2+ contents on the luminescence intensity was investigated, and it was found that the UV-vis upconversion luminescence increased and then decreased with an increasing Ca2+ concentration during the increase of the Ca2+ content from 0 mol% to 25 mol%, reaching the strongest fluorescence at 15 mol%, which was up to about 28 times stronger than that without Ca2+ doping. Furthermore, the mechanism was investigated, and it was found that the doping of Ca2+ disrupted the symmetry of the crystal field, resulting in a significant enhancement of the overall fluorescence. Applied to fluorescence intensity ratio thermometry, the absolute and relative sensitivities are as high as 0.0418 K−1 and 2.31% K−1, respectively, with a minimum temperature resolution of 0.0129 K.
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高影响因子
ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Huijie Zhang,Yuqing Xiao,Fei Qi,Pei Liu,Yuan Wang,Fangjie Li,Changlei Wang,Guojia Fang,Xingzhong Zhao
Hexagonal NaYF4:Yb3+,Tm3+@SiO2 upconversion nanoprism-mixed SiO2 passivation layers are introduced into hole-transport-layer free carbon-based perovskite solar cells to improve the power conversion efficiency. This layer on the top of the TiO2 scaffold has multiple functions: (i) upconversion units could transform near-infrared photons to visible region and thus extend the absorption range; (ii) nanoprisms act as light-scattering centers to prolong light-transmission distance and enhance light harvesting; (iii) SiO2 capping layer could suppress charge recombination at the interface of perovskite/TiO2 through passivation effect. The champion efficiency of our carbon-based device with an optimal amount of upconversion nanoprisms is 14.47%, which is 16.1% higher than that of the reference (12.46%). In addition, our unencapsulated solar cells exhibit good stability against moisture and thermal stressing in ambient condition. We also demonstrated another application of our device as a self-powered photodetector with NIR-sensitive features.
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高影响因子
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