RSC Advances
·
2016
·Vol. 6
·期 17
·14283-14289
·
IF 3.289
Peng Zhang,Yangyang He,Jianhua Liu,Jing Feng,Zhiqiang Sun,Pengpeng Lei,Qinghai Yuan,Hongjie Zhang
Lanthanide-doped nanocrystals have been researched extensively and used for bioimaging because of their optical properties, magnetic properties and X-ray absorption. Core–shell-structured lanthanide-doped nanocrystals have been developed and characterized by TEM and XRD analysis. The nanocrystals are composed of BaYbF5:0.5% Tm as the core and BaGdF5:20% Yb, 0.5% Tm as the shell. Apart from characterization of the nanocrystals, evaluation of both their cytotoxicity via MTT assays and their long-term toxicity via histological analysis showed that their cytotoxicity was low, indicating the possibility of further in vivo imaging. This work combined the functions of trimodal imaging into one nanoplatform and then UCL, CT, and MR imaging with core–shell-structured nanocrystals were investigated both in vitro and in vivo. Taking into consideration its structural characteristics and trimodal imaging abilities, it is expected that the developed multifunctional nanoplatform may be potentially useful for diagnosing diseases at an early stage.
研究领域:
生物医学工程
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材料科学
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影像医学
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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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
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光学材料
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2020
·
IF 0
Chunyu Qi,Li Chen,Yuan Gao,Yue Wang,Jing Li,Ligong Zhang,Yongshi Luo,Xiaojun Wang
Size and size distribution control along with the excitation/emission wavelength manipulation are the most indispensable for both fundamental research and applications of upconverting nanophosphors. In contradiction to the usual Ostwald ripening process, digestive ripening-mediated growth of core–shell nanostructures is observed in a lanthanide-doped ternary fluoride system. Time-dependent size evolution of NaYbF4:Tm@NaYF4 nanoparticles is systematically investigated, and a Ksp-involved growth mechanism is proposed to better understand this unusual phenomenon. The upconversion luminescence (UCL) intensity and branch ratio of near-infrared to visible emission (NIR/VIS) dramatically increase due to the NaYF4 coating but subsequently undergo a decline when an additional SiO2 layer grows outside. As a comparison, an alternant type of core–shell–shell nanostructure, NaYbF4:Tm@SiO2@NaYF4, is further constructed, in which both the UCL intensity and NIR/VIS ratio exhibit an inverse trend. The comparative analysis on the basis of steady and transient spectroscopic data from NaYbF4:Tm, and alternatively coated by silica and NaYF4 nanoshells, respectively, demonstrates that the UCL properties can be regulated through core–shell engineering once the optical behavior of the surface states can be manipulated. The results provide a promising alternative strategy to fabricate a uniform core–shell nanostructure with multicompositions, and this NIRin–NIRout luminescent profile deserves an expectable vision for the subsequent clinical applications of UCL imaging for deep biological tissues.
研究领域:
材料科学
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生物医学工程
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光学
✓ 已验证
产品关联
DOI
ACS Applied Nano Materials
·
2022
·
IF 6.14
Jian Zhang,Cong Cao,Jinsong Wang,Shiwen Li,Yu Xie
Multicolor upconversion luminescence (UCL) plays an essential role in anti-fake and information encipher. Here, we report a strategy to expand the color-adjustable emission range by regulating the doping concentration of Yb3+ in core@shell (C@S) upconversion nanoparticles (UCNPs) under the excitation of near-infrared (NIR) light at 980 nm and promoting the energy-transfer process. Subsequently, multicolor UCNPs were combined with acrylamide hydrogel to construct a three-dimensional (3D) information code with an adjustable emission color. The encoded information is readable only under 980 nm excitation light and disappears as soon as the excitation light is removed. We adopted three strategies to improve the security: multiple permutations and combinations of different emission light hydrogel blocks, the combination of rich optical information and binary code, and the shape coding of hydrogel blocks. Constructing a complex and changeable coding library significantly guarantees that the data can be enciphered and deciphered by simple light irradiation, and the content can be edited by permutation and combination combined with information coding rules. Therefore, it is expected to provide ideas for developing intelligent anti-counterfeiting materials and devices.
研究领域:
材料科学
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光学
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纳米技术
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化学
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安全技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2018
·Vol. 6
·期 38
·10360-10366
·
IF 5.976
Xiaokai Xu,Wei Li,Wan Zhou,Guiping Tan,Yihao Zheng,Chaofan Hu,Bingfu Lei,Xuejie Zhang,Yingliang Liu,Jianle Zhuang
Herein, NaYF4:Yb,Tm@SiO2/carbon dot nanocomposites have been successfully fabricated by a facile route. The structure and morphology of the nanocomposites were characterized by SEM, TEM, XRD, FT-IR and XPS measurements. It was demonstrated that carbon dots were embedded well in the silica layer coating on the surface of NaYF4:Yb,Tm nanoparticles, leading to a relatively stable structure of the nanocomposites. The nanocomposites showed interesting dual-mode luminescence properties, i.e. blue green light under a 365 nm UV lamp and blue purple light under a 980 nm laser. They were utilized to achieve light conversion films, ion detection probes and cell imaging, suggesting their great potential in the fields of anti-counterfeiting and bioapplications.
研究领域:
材料科学
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生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
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
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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
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环境科学
·
纳米技术
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Haoli Ji,Xiaoru Dai,Wenyan Zheng,Chen Zhuang,Wenkun Dong,Dong Chen,Shisheng Ling,Xvsheng Qiao,Zhiyu Wang,Xianping Fan,Guodong Qian
Lanthanide-doped upconversion nanoparticles excel in many fields of applications due to their unique anti-Stokes spectroscopic properties, narrow emission bands, and high photochemical stability. Yb-based self-sensitized fluorides nanoparticles have higher absorption efficiency at 980 nm near-infrared laser than Y-based nanoparticles. This enhanced absorption makes NaYbF 4 an outstanding upconversion host material for pumping more photons to high-energy excited states of Tm 3+ that are rich in energy levels. For these purposes, NaYbF 4 :Tm nanoparticles seem to be more favorable for photoluminescence applications. In this study, size-adjustable NaYbF 4 :Tm nanoparticles were prepared using a high-temperature co-precipitation method. Under 980 nm excitation, the upconversion emission spectra appeared four emission bands in visible region. By increasing the size of nanoparticles, we well enhanced upconversion luminescence, indicating that surface quenching sites play a major role in inhibiting upconversion luminescence. In addition, the negative thermal quenching effect of NaYbF 4 :Tm nanoparticles was observed with temperature dependent luminescence spectra, and we found that smaller sized nanoparticles got stronger negative thermal enhancement and better temperature sensing performance. We fitted the luminescence intensity ratio (LIR) between the 1 D 2 → 3 F 4 (451 nm) and 1 G 4 → 3 F 4 (647 nm) transitions of Tm 3+ , where these nanoparticles exhibited both good absolute sensitivity S A (1.38% K −1 , at 453 K) and relative sensitivity S R (2.56% K −1 , at 293 K). These results suggested that NaYbF 4 :Tm nanoparticles could be a good candidate for thermometers even at high temperatures (up to 500 K).
研究领域:
材料科学
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光学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ENERGY CONVERSION AND MANAGEMENT
·
2017
·
IF 5.589
Wenjia Wang,Lei Yang,Zhaosen Yin,Shengyan Kong,Wei Han,Jinglai Zhang
In this study, human feces were hydrothermal liquefied and converted into biocrude over Ni-Tm/TiO 2 catalyst. The influence of catalysts, reaction temperature, and holding time on the distribution of products and element content of biocrude was assessed. The biocrude yield increased to 53.16% with a reaction temperature of 330 °C, a holding time of 30 min, and adding Ni-Tm/TiO 2 catalyst while the liquefaction conversion peaked at 89.61%. The biocrude had an HHV of 36.64 MJ/kg and was similar to heavy crude oil. The biocrude is rich in fatty acid amides, esters, and oxygen-containing-only heteroatom-ring compounds as well as some nitrogen-containing heteroatom-ring compounds. The main gaseous products were CO 2 , CH 4 , and C 2 H 6 . Hydrothermal liquefaction over Ni-Tm/TiO 2 catalyst could be a potential method to handle human excrement treatment and produce biofuel.
研究领域:
环境科学
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能源科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2016
·
IF 8.328
Yawei Yang,Wenxiu Que,Xinyu Zhang,Xingtian Yin,Yonglei Xing,Meidan Que,Hongyang Zhao,Yaping Du
A chloroform-assistant Se dissolution in oleylamine without trioctylphosphine and alkylthiol as the green precursor was used for facile and robust synthesis of quaternary selenide nanocrystals. The S 2− modified hydrophilic Cu 2 ZnSnS 4 and Cu 2 ZnSnSe 4 nanocrystals were first prepared by a one-pot thermal decomposition route, followed by a bi-phase hydrophilic treatment process. As a proof of concept, the as-obtained hydrophilic nanocrystals were hybridized with ZnO microspheres as photosensitizers to achieve visible light-driven photocatalytic application; on the other hand, hybridized with NaYF 4 : Yb, Tm microplates to achieve near-infrared light-driven photocatalytic application. These photosensitized hybrids as photocatalysts expanded the light absorption from ultraviolet to visible even near-infrared region, which showed excellent photocatalytic Rhodamine B degradation under visible and near-infrared irradiation compared to pure ZnO and NaYF 4 : Yb, Tm, respectively. Therefore, these hydrophilic Cu 2 ZnSnS 4 and Cu 2 ZnSnSe 4 nanocrystals are proved as efficient photocatalytic sensitizers due to the efficient utilization of the visible light and emissions upconverted from near-infrared light.
研究领域:
材料科学
·
化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2018
·Vol. 47
·期 32
·11253-11263
·
IF 4.099
Yana Liu,Cheng Zhang,Chen Xu,Caixue Lin,Keke Sun,Jie Wang,Xueli Chen,Ling Li,Andrew K. Whittaker,Hai-Bing Xu
Using a facile one-step hydrothermal method, a series of metal–organic frameworks containing Gd/Tm (Gd/Tm-MOFs) were prepared successfully. Through the mutual activation of Gd3+ and Tm3+, Gd/Tm-MOFs showed unexpected excellent up-conversion luminescence (UCL) and a superior positive magnetic resonance image (MRI). Using doxorubicin hydrochloride (DOX) as a drug model, the feasibility of Gd/Tm-MOFs as a multifunctional drug carrier was demonstrated. Through modifying Gd/Tm-MOFs with uniform mesoporous silica (mSiO2) shells and folic acid (FA), the drug loading was improved up to 41.5 mg g−1, and pH responsive drug release increased to 64% from 12% by regulating the pH from 5.8 to 7.4. Also, the particles were tracked by MRI, and the second highest longitudinal relaxivity (r1) among the reported gadolinium complexes of 225.86 mM−1 s−1 was achieved. The cell imaging shows obvious blue and red luminescence under 980 nm laser excitation, and the up-conversion luminescence is unique because there is no autofluorescence from cells under 980 nm excitation. This indicates their promising application in the biological field. All the experiments indicate the promising application of Gd/Tm-MOFs in diagnosis and treatment.
研究领域:
材料科学
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生物医学工程
·
药剂学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RARE METALS
·
2021
·Vol. 41
·期 2
·650-662
·
IF 4.003
Guo Hua,Li Jun,Zou Xian-Rui,Wang Hong-Shui,Kang An,Zhou Huan,Li Ming-Jun,Zhao Xiao-Yan
Abstract Development of photocatalytic materials able to profit from the whole spectrum of sun for efficient organic pollution removal and bacterial elimination is a fascinating strategy in environmental engineering. In current work, GO-TiO 2 /(Ca,Y)F 2 :Tm,Yb, a full-spectrum composite photocatalyst, was prepared via hydrothermal processing with TiO 2 /(Ca,Y)F 2 :Tm,Yb particles deposited on the surface of graphene oxide (GO). The surface properties of GO-TiO 2 /(Ca,Y)F 2 :Tm,Yb were characterized using various characterization techniques including X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and Brunauer–Emmett–Teller (BET) surface area analyzer. Besides, ultraviolet–visible (UV–Vis) diffuse reflectance spectroscopy, electron spin resonance (ESR) and other methods were used to systematically explore the photocatalytic mechanism of GO enhancement of TiO 2 /(Ca,Y)F 2 :Tm,Yb. In photocatalytic degradation study, the degradation rate of methyl orange (MO) was improved by 40% when GO was added into the TiO 2 /(Ca,Y)F 2 :Tm,Yb system. In addition, the presence of GO also improves the antibacterial ability of TiO 2 /(Ca,Y)F 2 :Tm,Yb against Escherichia coli and Staphylococcus aureus . All results reveal high efficacy of GO-TiO 2 /(Ca,Y)F 2 :Tm,Yb under full spectrum light irradiation, in which (Ca,Y)F 2 :Tm,Yb and TiO 2 can improve its utilization of full spectrum sunlight, and GO can enhance adsorption ability of dye and electron–hole pair differentiation ability of TiO 2 /(Ca,Y)F 2 :Tm,Yb. Graphic abstract
研究领域:
环境工程
·
材料科学
✓ 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）