BIOMATERIALS
·
2011
·
IF 7.883
Ao Xia,Yuan Gao,Jing Zhou,Chunyan Li,Tianshe Yang,Dongmei Wu,Limin Wu,Fuyou Li
New core–shell structured NaYF 4 :Yb 3+ ,Tm 3+ @Fe x O y nanocrystals , with 20 nm Yb 3+ ,Tm 3+ -co-doped NaYF 4 nanocrystals as a core and 5 nm Fe x O y nanocrystals as a shell, have been synthesized and characterized by TEM and XRD analysis . These core–shell nanocrystals exhibit excellent near-infrared upconversion luminescence (UCL) emission at 800 nm under excitation by a continuous-wave 980 nm laser and superparamagnetic properties with a saturation magnetization (Ms) of ∼12 emu/g. Water-soluble nanocrystals were obtained by surface ligand exchange of oleic acid-coated precursor nanocrystals, and their internalization within living cells has been investigated by laser scanning UCL microscopy. Furthermore, the obtained core–shell nanocrystals have been applied in dual-modality T 2 -enhanced magnetic resonance (MR) and UCL imaging in vivo of the lymphatic system. Moreover, the toxicity of NaYF 4 :Yb 3+ ,Tm 3+ @Fe x O y nanocrystals has also been evaluated by MTT assay, IC50 values, and histological analysis of lymphatic node sections.
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DOI
PubMed
高影响因子
LANGMUIR
·
2014
·
IF 4.384
Hongqi Chen,Yingying Guan,Shaozhen Wang,Yuan Ji,Mengqi Gong,Lun Wang
A homogeneous immunoassay for the sensitive and selective determination of trace amounts of α-fetoprotein (AFP, a cancer marker) by detection in the near-infrared (NIR) region based on luminescence energy transfer (LET) from NaYF4:Yb,Tm/NaGdF4 core–shell upconverting nanoparticles to gold nanorods (GNRs) is presented. The carboxyl-functionalized NaYF4:Yb,Tm/NaGdF4 core–shell upconverting nanoparticles (UCNPs) were excited by a 980 nm continuous wavelength laser, and its emission peak appeared at a near-infrared wavelength (∼804 nm). The carboxyl-functionalized upconverting nanoparticles were conjugated with the anti-AFP (Ab1) and acted as donor. GNRs with a high absorption band around 790 nm, which was overlapped the UCNPs emission, were synthesized and acted as the acceptor. The donor (negatively charged) interacted with the acceptor (positively charged) via electrostatic interactions to bring them into close proximity. LET could occur, producing a quenching phenomenon. When the AFP antigens were added into the system, the binding affinity between AFP and Ab1 was stronger than the electrostatic interactions, which released the energy acceptors from the energy donors, interrupting luminescence energy transfer, and therefore, the luminescence was recovered. On the basis of the restored luminescence, a turn-on optical immunosening system was developed. Under the optimal conditions, the linear range of detection was from 0.18 to 11.44 ng/mL for AFP (R = 0.99), with a detection limit as low as 0.16 ng/mL. The proposed method has also been used to monitor AFP in human serum samples. Therefore, further study based on the NaYF4:Yb,Tm/NaGdF4 core–shell nanoparticles-GNRs construction may open the way for a new class of NIR-LET biosensors with wide applications.
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DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2025
·
IF 5.5
Zhongfei Shang,Meimei Wang,Honghong Li,Jiahao Dong,Luyan Yang,Xincun Dou,Baiyi Zu
The exploration of efficient hazardous chemical sensing technology is of great importance to protect the environment and maintain public security. Here, a design strategy of a trimode upconversion nanoprobe was developed for H2O2 detection through establishing the inner filter effect (IFE) between the anthracene-based probes and the NaYF4:Yb/Tm/Er upconversion nanoparticles (UCNPs). The trimode nanoprobe exhibits superior H2O2 detection performance, including a low limit of detection (LOD) of 152 nM, fast response (<3 s), outstanding selectivity, and robust anti-interference ability even in the presence of 15 common interferents. Furthermore, the practical utility of this design is conclusively demonstrated through a sensing chip capable of accurately and selectively identifying H2O2 even in the presence of more than 7 types of coexisting multicolor interferents. This sensing strategy, characterized by its strong anti-interference capability even when facing extremely complex real-world samples, is expected to establish a promising framework for ultra-accurate detection of hazardous substances.
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DOI
高影响因子
CRYSTENGCOMM
·
2020
·Vol. 22
·期 46
·8110-8117
·
IF 3.117
Zhiyuan Cheng,Hao Lin,Tong Liu,Yongjin Li,Shenghong Yang,Yueli Zhang
β-NaErF4:0.005Tm upconversion nanocrystals (UCNCs) with core–shell structure are quite popular due to efficient red upconversion luminescence. However, the traditional seed-mediated growth method is not continuous and quite time consuming, while the successive layer-by-layer strategy is unfriendly because of the usage of toxic sodium trifluoroacetate (Na-TFA). In this work, we utilized a novel one-pot strategy to synthesize β-NaErF4:0.005Tm with core–shell–shell structure. The morphology of the core could be significantly regulated. NaYbF4 and NaYF4 shells could be epitaxially grown on the core by simply adding fresh raw materials and heating to 300 °C, successively. Thanks to the suppression of surface quenching and energy back transfer from Yb3+ to Er3+, the population density of excited states of Er3+ (4I13/2, 4I11/2 and 4I9/2) was much improved, resulting in the tremendously enhanced upconversion intensity of β-NaErF4:0.005Tm@NaYbF4@NaYF4. This one-pot protocol could supply core–shell–shell red UCNCs with regular morphology, enhanced intensity and long-lasting decay lifetime, offering promising opportunities for applications such as bioprobing, anti-counterfeiting, photodynamic therapy, etc.
研究领域:
材料科学
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纳米技术
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光学
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生物医学工程
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DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Mingye Ding,Xiaoyan Wang,Yinbiao Shi,Zixia Lin,Zhengtao Deng,Xiaofei Yang
Owing to their excellent photoelectric and optical properties, lead halide perovskite quantum dots (PeQDs) have attracted great attention and have broad applications in various fields. However, the shortcomings of poor stability and short-wavelength (ultraviolet/visible) excitation restrict their practical applications. Herein, to address the above issues, we report a polyacrylonitrile-based composite film containing CsPbX3 (X = Br and I) PeQDs and β-NaYF4:Yb/Ln (Ln = Tm and Er) upconversion nanoparticles (UCNPs) via an electrospinning strategy. Interestingly, all-inorganic CsPbX3 PeQDs are synthesized through an in situ growth process in polyacrylonitrile nanofibers, which provide a polymer matrix for the protection of PeQDs against decomposition under the effect of an external environment. Upon 980 nm laser irradiation, lanthanide-sensitized UC luminescence of stable CsPbX3 can be realized through radiative energy transfer from Tm3+/Er3+ ions to PeQDs. Consequently, dual-mode luminescence, including downshifting and UC with color-tunable outputs, can be observed from PeQDs under dual-wavelength excitation (UV and NIR). Benefiting from the special luminescent feathers (temperature-sensitive UC and dual-mode luminescence), the as-obtained composite nanofibers exhibit great potential in high-level anticounterfeiting and accurate noncontact thermometry.
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Shuguang Li,Jize Liu,Haibo Wu,Xinxin Zhang,Yanqiong Guo,Boyang Kang,Limin Zhao
Photocatalytic hydrogen production with simultaneous degradation of organic pollutants by using solar energy provide a promising strategy to solve the energy and environmental issue in the future. However, for onefold wide band-gap semiconductor, the poor photocatalytic efficiency limits its application on a large scale due to its easy recombination of photo-generated electron-hole pairs and low solar energy utilization. Herein, a novel Z-scheme BiVO 4 (040)-Bi-(NaYF 4 :Er,Yb,Tm@BiOBr)/Bi photocatalyst is prepared via photo-assisted isoelectric point method. In this composite photocatalyst, up-convention luminescence material, NaYF 4 :Er,Yb,Tm, can offer more ultraviolet light and visible light to intensify the activations of BiOBr and metal Bi nanoparticles, respectively. Furthermore, the formation of Z-scheme BiVO 4 (040)-BiOBr photocatalystic sytem, the spatial separation of the BiVO 4 (040) and BiVO 4 (110) facets and the presence of metal Bi surface plasmon resonance effect are contributed to the high-efficiency separation of the photo-generated electron-hole pairs. The experimental results show that as-prepared Z-scheme BiVO 4 (040)-Bi-(NaYF 4 :Er,Yb,Tm@BiOBr)/Bi photocatalyst exhibits advanced photocatalytic hydrogen production amount (192.0 μm) and excellent degradation ratio of malachite green (88.51 %) under simulated sunlight irradiation for 5.0 h. The apparent quantum yield of the Z-scheme BiVO 4 (040)-Bi-(NaYF 4 :Er,Yb,Tm@BiOBr)/Bi photocatalyst at 420 nm reaches a specific value of 5.8 %. In addition, Z-scheme BiVO 4 (040)-Bi-(NaYF 4 :Er,Yb,Tm@BiOBr)/Bi photocatalyst also remains a high stability in the photocatalytic hydrogen production with simultaneous degradation of malachite green within six reuse. At last, the possible reaction mechanism and degradation pathways of malachite green caused by Z-scheme BiVO 4 (040)-Bi-(NaYF 4 :Er,Yb,Tm@BiOBr)/Bi photocatalyst under simulated sunlight irradiation are put forward.
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高影响因子
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