OPTICAL MATERIALS
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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.
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高影响因子
Scientific Reports
·
2017
·Vol. 7
·期 1
·1-8
·
IF 4.259
Chen Xu,Zhou Donglei,Xu Wen,Zhu Jinyang,Pan Gencai,Yin Ze,Wang He,Zhu Yongsheng,Shaobo Cui,Song Hongwei
Localized electric filed enhancement by surface plasmon resonance (SPR) of noble metal nanoparticles is an effective method to amplify the upconversion luminescence (UCL) strength of upconversion nanoparticles (UCNPs), whereas the highly effective UCL enhancement of UCNPs in colloids has not been realized until now. Here, we designed and fabricated the colloidal Au-Ag nanocage@NaYF 4 @NaYF 4 :Yb,Er core-shell hybrid with different intermediate thickness (NaYF 4 ) and tunable SPR peaks from visible wavelength region to NIR region. After the optimization of the intermediate spacer thickness (~7.5 nm) of NaYF 4 NPs and the SPR peak (~950 nm) of noble metal nanoparticles, an optimum enhancement as high as ~25 folds was obtained. Systematic investigation indicates that UCL enhancement mainly originates from the influence of the intermediate spacer and the coupling of Au-Ag nanocages with the excitation electromagnetic field of the UCNPs. Our findings may provide a new thinking on designing highly effective metal@UCNPs core-shell hybrid in colloids.
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高影响因子
OPTICAL MATERIALS
·
2020
·
IF 2.779
Hua Li,Xiaobo Shi,Xia Li,Lingbo Zong
Size-tunable β-NaYF 4 : Yb/Er (50–400 nm) up-converting nanoparticles (UCNPs) with a strong green emission were successfully prepared by a facile thermal decomposition method in a short period of time. The effects of the reaction time, the oleic acid (OA) content, and the doped Gd 3+ concentration on the crystal structure, the size evolution mechanism and the luminescence mechanism of the β-NaYF 4 : Yb/Er nanoparticles were discussed in detail. Characterization was completed using X-ray diffraction (XRD), transmission electron microscopy (TEM), high-resolution (HR-TEM), scanning electron microscopy (SEM), and photoluminescence (PL). The results reveal that the phase transition was completed at 15 min and the morphology of the NaYF 4 : Yb/Er UCNPs changed from spherical to large hexagonal disks (200–400 nm) in non-doped Gd 3+ . An appropriate decrease in the volume ratio of oleic acid (OA) to 1-octadecene (ODE) promoted NaF production, resulting in the formation of the hexagonal phase crystals and the subsequent increase of luminous intensity by 30–40 times. More importantly, the size of the β-NaYF 4 : Yb/Er decreased with Gd 3+ doping, and the UCNPs ultimately transformed into small hexagonal prisms (50 nm) with high monodispersity when the doping concentration of Gd 3+ was 60 mmoL. The PL spectra confirmed that the luminous intensity of the UCNPs with doped Gd 3+ was much higher than that of the undoped UCNPs. The results show that this route for UCNP fabrication with high luminous efficiency and a small size could be extended to other UCNP systems for multifunctional biomedical applications.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2019
·
IF 6.393
Feng Chen,Qiujun Lu,Youyu Zhang,Shouzhuo Yao
Due to the low abundance of miRNAs and the coordinated regulation of multiple miRNAs toward some biological processes, a method that can sensitively and simultaneously detect multiple miRNAs is needed. Here, a strand displacement dual amplification (SDDA) strategy was developed for multiple miRNAs analyses using a unique single strand-double strand-single strand DNA (sdsDNA), which generated by the target recognition probe hybridizing with the site region probe. During the process of SDDA, miRNA hybridized to the target recognition domain of sdsDNA, thereby releasing the site, which triggered the first strand displacement reaction. This strand displacement event resulted in the release of the other site, triggering the second strand displacement reaction. Both two strand displacement reactions in each assembly circle were integrated for amplified signals, which were tested by a fluorescence resonance energy transfer (FRET) assay. NaYF 4 :Yb,Tm/Er UCNPs and Ti 3 C 2 nanosheets were used as the energy donor-acceptor pair. By employing 1:2 ratio of donor-acceptor, the energy transfer efficiency between NaYF 4 :Yb,Tm/Er UCNPs and Ti 3 C 2 nanosheets could reach 90%, which enhanced signal-to-background ratio. Combining the benefits of dual amplification and efficient energy transfer on miRNAs detection, this assay exhibited a linear range from 5 fM to 100 pM for miRNA-21 and miRNA-10b. Moreover, this assay was applied to estimate the expression of miRNA-21 and miRNA-10b in human hepatoma and hepatocyte cell lines. Therefore, this FRET-based SDDA strategy has been used for highly sensitive detection of multiple miRNAs in cell lysate and facilitates the development of efficient biosensor platform.
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高影响因子
BIOSENSORS & BIOELECTRONICS
·
2015
·
IF 6.409
Jianguo Zhang,Shaozhen Wang,Ni Gao,Dexiang Feng,Lun Wang,Hongqi Chen
A new turn-on luminescence energy transfer (LET) system has been designed for the detection of prostate specific antigen (PSA, a cancer marker) that utilizes Mn 2+ -enhanced long wavelength luminescence NaYF 4 : Yb, Er upconversion nanorods as the donor and gold nanorods as the acceptor. The Mn 2+ -doped NaYF 4 :Yb,Er upconversion luminescence nanorods with an emission peak located in the red region were synthesized. The presence of Mn 2+ markedly increased the luminescence intensity over that of the NaYF 4 :Yb, Er upconversion nanomaterials (excited by a 980 nm continuous wavelength laser). The surfaces of Mn 2+ -doped NaYF 4 :Yb, Er upconversion nanorods were modified with poly(acrylic acid). Antibodies against prostate specific antigen were bound to the surface of the carboxyl-functionalized upconversion nanorods, which acted as the energy donor in this LET system. Gold nanorods with an absorption band at ~666 nm were synthesized by the seed growth method, acted as the energy acceptor. The emission band of the upconversion nanorods overlapped well with the absorption band of the gold nanorods. The luminescence was quenched because of the electrostatic interactions that shortened the distance between the donor (negatively charged) and the accepter (positively charged).When the PSA antigen was added into the system, the energy acceptor and the energy donors were separated because the binding affinity between PSA and anti-PSA was greater than the electrostatic interactions, and thereby the luminescence was recovered. The linear range of detecting PSA was from 0.1172 to 18.75 ng/mL ( R =0.995), with a limit of detection for PSA as low as 0.1129 ng/mL. The method was successfully applied to the sensing of PSA in human serum samples.
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PubMed
高影响因子
Nanoscale
·
2016
·Vol. 8
·期 45
·19014-19024
·
IF 7.76
Lijie Bai,Wenya Jiang,Chunxiao Gao,Shuxian Zhong,Leihong Zhao,Zhengquan Li,Song Bai
The combination of upconversion nanocrystals with a wide-bandgap semiconductor is an efficient strategy to develop near-infrared (NIR)-responsive photocatalysts. The photocatalytic activity of the hybrid structures is greatly determined by the efficiency of the energy transfer on the interface between upconversion nanocrystals and the semiconductor. In this work, we demonstrate the interface design of a NaYF4:Yb,Tm–BiOCl hybrid structure based on the choice of suitable BiOCl facets in depositing NaYF4:Yb,Tm upconversion nanocrystals. It was found that the selective deposition of NaYF4:Yb,Tm nanocrystals on the BiOCl(110) facet can greatly enhance the photocatalytic performance in dye degradation compared with the sample with NaYF4:Yb,Tm nanocrystals loaded on the BiOCl(001) facet. Two effects were believed to contribute to this enhancement: (1) a stronger UV emission absorption ability of the BiOCl(110) facet from NaYF4:Yb,Tm in generating more photo-induced charge carriers resulted from the narrower bandgap; (2) a shorter diffusion distance of photogenerated charge carriers to the BiOCl(110) reactive facet for surface catalytic reactions owing to the spatial charge separation between different facets. This work highlights the rational interfacial design of an upconversion nanocrystal–semiconductor hybrid structure for enhanced energy transfer in photocatalysis.
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PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Qiqi Nie,Yongbo Wang,Licong Jia,Bei Liu,Enzhou Liu,Xiaoyun Hu,Jun Fan
In this paper, a novel detection method based on luminescence resonance energy transfer (LRET) system for sensitive detection of Mn 2+ ions has been proposed. The positively charged upconversion nanoparticles capped with polyethyleneimin (PEI-UCNPs) and negatively charged Ag NPs capped with tripolyphosphate (P 3 O 10 5− -Ag NPs) were bound through electrostatic interaction . They were used as energy donors and acceptors, respectively. The green upconversion luminescence could be quenched because of a good overlap between the UCNPs emission and the Ag NPs absorption spectra . Nevertheless, the LRET was disrupted and the green upconversion luminescence was restored in the presence of Mn 2+ because of the coagulation of P 3 O 10 5− -Ag NPs. Thus, the relative luminescence intensity increased as the concentrations of Mn 2+ increased. The response is linear to the concentrations of Mn 2+ in the range from 0.2 to 5 μM, and the detection limit is evaluated to be 150 nM (S/N = 3). This probe was easy to operate with satisfactory selectivity and excellent sensitivity, which would be able to satisfy the requirements of Mn 2+ -related detection.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Guangliang Lu,Rao Qin,Dabiao Zhai,Tianqi Wan,Jiangang Jiang,Dan Zhang,Ping Zhang,Yiping Wang,He Wang
The development and comparison of Latent Fingerprint Patterns (LFPs) constitute critical components of research in fingerprint detection and identification. However, the development of nanomaterials visualization and digital algorithms for LFPs analysis are mostly studied independently, resulting in inaccurate LFPs. This research synthesized a series of efficient red-emitting NaYF 4 :20 %Yb, 2 %Er, x %Mn ( x = 0, 5, 10, 15, 20, 25, 30, 35, and 40) upconversion nanoparticles (UCNPs) for image development, which were combined with a digital algorithm for accurate LFP recognition. The eightfold increase in luminescence intensity of NaYF 4 :Yb, Er, 30 %Mn at 653 nm effectively avoids interference from biological tissue fluorescence. This improvement is credited to the efficient reverse energy transfer mechanism between Er 3+ and Mn 2+ ions, specifically the transition sequence 4 S 3/2 (Er 3+ ) → 4 T 1 (Mn 2+ ) → 4 F 9/2 (Er 3+ ). Furthermore, a MATLAB program was employed to process the fluorescent images of LFPs developed using the UCNPs nanophosphors, achieving a high matching score of 90.09 % for the optimized sample, significantly outperforming traditional benchmarks. These results demonstrate the superior effectiveness of the NaYF 4 :Yb, Er, 30 %Mn nanophosphor, combined with digital processing algorithms, for practical LFP recognition applications.
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高影响因子
ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Xiaokai Xu,Wei Li,Chaofan Hu,Bingfu Lei,Xuejie Zhang,Yadong Li,Qiuqiang Zhan,Yingliang Liu,Jianle Zhuang
In recent years, the application of nanomaterials in promoting plant growth and augmenting photosynthesis has aroused great interest. Herein, carbon dots (CDs) are combined with NaYF4:Yb,Er to achieve an enhanced upconversion red emission. The effects of the obtained NaYF4:Yb,Er@CDs nanocomposites on the growth of mung bean plants are investigated. It is found that an appropriate concentration of the NaYF4:Yb,Er@CDs nanocomposites (0.5 mg/mL) can enhance the water absorption ability of hydroponic mung beans and promote their growth after incubation for 7 days. Confocal imaging shows that the nanocomposites can transfer from the roots to the stems and leaves. Interestingly, after spraying the nanocomposite solution on the surface of the mung bean seedling leaves and placing them under sunlight for 2 weeks, the root/stem lengths and wet/dry weight clearly increase. Moreover, the photosynthetic rate of the mung bean seedling is found to increase by more than 2 times, while the transpiration rate and stomatal conductance are improved by 144 and 148%, respectively. Such a promoting effect is ascribed to the ability of the NaYF4:Yb,Er@CDs nanocomposites to convert near-infrared (NIR) radiation into red light, which is beneficial for plant photosynthesis. This work provides a promising strategy for promoting plant growth by the application of nanomaterials.
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高影响因子
JOURNAL OF LUMINESCENCE
·
2019
·
IF 2.961
Manli Zhang,Xuesong Zhai,Pengpeng Lei,Shuang Yao,Xia Xu,Lile Dong,Kaimin Du,Chengyu Li,Jing Feng,Hongjie Zhang
Temperature sensors based on upconversion luminescence (UCL) intensity ratio have attracted great attention due to the high sensitivity. The enhancement of UCL is helpful to improve the sensitivity of temperature sensor. Doping is an effective way to achieve the UCL enhancement. Ga 3+ ions doped NaYF 4 :18%Yb,2%Er have been prepared through a facile one-pot solvothermal method . Upconversion (UC) emission intensity was significantly enhanced by introducing Ga 3+ ions into the lattice of NaYF 4 :Yb,Er, especially the green UC emission. With Ga 3+ concentration increasing, the size of the resulting NaYF 4 :Yb,Er,x%Ga particles decreases gradually. By doping 25% Ga 3+ , the green UC emission is increased by 30 times, while the red emission is enhanced by only 8 times. The morphology of particles and local symmetry around Er 3+ ions have been changed, resulting in the selective enhancement of green UC emission. In addition, the temperature-dependent UCL properties of NaYF 4 :Yb,Er,25%Ga and NaYF 4 :Yb,Er were investigated. The maximum thermal sensitivity of NaYF 4 :Yb,Er,25%Ga could reach 0.0046 K −1 at 498 K. Therefore, NaYF 4 :Yb,Er,25%Ga with strong green UCL could be served as a potential candidate for sensitive temperature sensing.
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高影响因子
MOLECULES
·
2026
·Vol. 31
·期 19
·3412
·
IF 5.1
Xinyao Su,Wen Guo,Qunming Zhou,Tingting Xie,Lingyan Wu,Shangyang Wang,You Fu,Shurong Li,Wei Peng,Peijun Meng
Cancer theranostics urgently demands multifunctional nanomaterials capable of simultaneously enabling high-sensitivity imaging and multimodal synergistic therapy. In this study, a three-layer core–shell nanocomposite, NaYF4:Yb,Tm@NaGdF4:Eu@NH2-MIL-53(Fe), was designed and synthesized. The NaYF4:Yb,Tm nanoparticle core provides upconversion luminescence upon near-infrared (NIR) excitation and can serve as an excitation source for photodynamic therapy. An epitaxially grown NaGdF4:Eu intermediate shell was introduced to enhance luminescence and provide T1-weighted magnetic resonance imaging (MRI) capability. The outermost NH2-MIL-53(Fe) metal–organic framework shell was subsequently coated to provide potential chemodynamic therapy (CDT) capability. The effects of the Eu3+doping concentration, reaction temperature, reaction time, and oleic acid (OA)/1-octadecene (ODE) ratio on the anisotropic growth into a dumbbell-like morphology were examined to determine the optimal conditions. Under the optimal conditions (10 mol% Eu3+, 300 °C, 60 min, OA/ODE = 4:16), core–shell nanocrystals with regular morphology, uniform size, and the strongest upconversion luminescence were obtained. Polyvinylpyrrolidone (PVP)-mediated surface functionalization successfully induced the in situ growth of the NH2-MIL-53(Fe) outer shell, thereby constructing a three-layer core–shell nanocomposite as a potential theranostic platform. Various characterizations confirmed that the resulting composite integrates upconversion luminescence, paramagnetism, and hydroxyl radical generation capability, suggesting potential for NIR-driven dual-modal imaging-guided synergistic therapy.
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高影响因子
JOURNAL OF LUMINESCENCE
·
2022
·
IF 4.171
Shuopan Dun,Siqi Zhang,Xugeng Guo,Jinglai Zhang
Introducing upconversion nanoparticles (UCNPs) onto photoanode films is an effective way to enhance the photovoltaic performance of dye-sensitized solar cells (DSSCs). In this contribution, the β -NaYGdF 4 :Yb, Er UCNPs and β -NaYGdF 4 :Yb,Er@SiO 2 nanoparticles (NPs) were prepared by tuning the dopant contents of the Gd ions and the β -NaYGdF 4 :Yb,Er@SiO 2 NPs were applied as an upconverting layer in DSSCs. Upconversion photoluminescence indicates that the UCNPs doped with 5% Gd ions exhibit the strongest green and red fluorescence emissions . Moreover, the DSSCs device incorporating the NPs with 5% Gd ion dopant can achieve an optimal photovoltaic efficiency of 5.89%, which is 20.20% enhancement in comparison to the device without NPs and 16.17% increasement with respect to the device containing β -NaYF 4 :Yb,Er@SiO 2 nanocrystals , thus highlighting the effect of the doping of the Gd ions in nanoparticles on their upconversion photoluminescence and photoelectric performance. Accordingly, the current results offer a feasible strategy for further regulating the photoluminescence property of UCNPs and optimizing the photovoltaic performance of UCNPs-based DSSCs devices.
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高影响因子
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