SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Linlin Zhao,Juan Li,Yuhong Liu,Yuan Wei,Jin Zhang,Jinzha Zhang,Qing Xia,Qiang Zhang,Wenbo Zhao,Xiaoqiang Chen
We reported a novel ECL immunosensor for detection of carcinoembryonic antigen (CEA) based on the reduced graphene Oxide-BaYF 5 :Yb, Er (rGO-BaYF 5 :Yb, Er) nanocomposites. The rGO-BaYF 5 :Yb, Er nanocomposites, used as electrode luminescence materials, were prepared by in situ hydrothermal method, and characterized by TEM, XRD, UV–vis spectra, and upconversion fluorescence spectra. Further, poly (diallyldimethylammonium chloride) (PDDA), Au nanoparticles (AuNPs), and Anti-CEA were successively assembled on the surface of rGO-BaYF 5 :Yb, Er nanocomposites modified-electrode for fabricating ECL immunosensor. The results of the ECL measurements of CEA indicated that this novel ECL immunosensor exhibited high sensitive response to CEA in a linear range of 0.001–80 ng mL −1 with a low detection limit of 0.87 pg mL −1 , good selectivity and satisfactory stability.
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高影响因子
DALTON TRANSACTIONS
·
2016
·Vol. 45
·期 27
·11129-11136
·
IF 4.177
Yue Su,Xiuling Liu,Pengpeng Lei,Xia Xu,Lile Dong,Xianmin Guo,Xingxu Yan,Peng Wang,Shuyan Song,Jing Feng,Hongjie Zhang
Core–shell–shell heterostructures of α-NaLuF4:Yb/Er@NaLuF4:Yb@MF2 (M = Ca, Sr, Ba) have been successfully fabricated via the thermal decomposition method. Upconversion nanoparticles (UCNPs) were characterized by powder X-ray diffraction (XRD), transmission electron microscopy (TEM), upconversion luminescence (UCL) spectroscopy, etc. Under 980 nm excitation, the emission intensities of the UCNPs are remarkably enhanced after coating the MF2 (M = Ca, Sr, and Ba) shell. Among these samples, CaF2 coated UCNPs show the strongest overall emission, while BaF2 coated UCNPs exhibit the longest lifetime. These results demonstrate that alkaline earth metal fluorides are ideal materials to improve the UCL properties. Meanwhile, although the lattice mismatch between the ternary NaREF4 core and the binary MF2 (M = Sr and Ba) shell is relatively large, the successfully synthesized NaLuF4:Yb/Er@NaLuF4:Yb@MF2 indicates a new outlook on the fabrication of heterostructural core–shell UCNPs.
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高影响因子
JOURNAL OF LUMINESCENCE
·
2024
·
IF 3.3
Wei Zhou
This paper focuses on the study of core-shell rare earth NaLuF 4 :Yb,Er@NaLuF 4 :Yb,Tm@NaLuF 4 upconversion nanoparticles (UCNPs) with multispectral emission for applications in the field of ratiometric temperature sensors. This approach lays the foundation for exploring more luminous intensity ratios (LIRs) between different spectra for temperature sensing. Additionally, it facilitates the use of different LIRs for various temperatures, yielding higher sensitivity. Under 980 nm laser excitation, these UCNPs produce multispectral luminescence covering blue, green, red, and infrared luminescence intervals. Within the temperature range of 293–473 K, we measured the luminescence intensity of different emission peaks and observed that the 803 nm peak exhibits an anomalous thermal enhancement effect. The LIR between the luminescence intensities of different emission peaks is fitted using formulas to calculate the absolute sensitivity ( S a ), relative sensitivity ( S r ), uncertainty ( ΔT ), and repeatability ( R ) of the corresponding LIR. Comparisons revealed that LIR(I 803 /I 540 ) demonstrates greater S a compared to the other LIRs. Furthermore, the S r of LIR(I 803 /I 540 ) is higher in the elevated temperature range, whereas LIR(I 522 /I 540 ) shows greater values in the lower temperature range. By combining the advantages of these two LIRs at different temperatures, LIR(I 522 /I 540 ) is utilized at low temperatures and LIR(I 803 /I 540 ) at high temperatures, achieving a combined S r of 0.67–1.06 %K −1 and a combined ΔT of less than 0.045. The R of LIR(I 803 /I 540 ) is tested and found to be greater than 99 % averaged over five cycles. In summary, the NaLuF 4 :Yb,Er@NaLuF 4 :Yb,Tm@NaLuF 4 UCNPs proposed in this paper demonstrate potential applications in the field of temperature sensing.
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Nanoscale
·
2017
·Vol. 10
·期 6
·2834-2840
·
IF 7.367
Bin Zhou,Bing Xu,Huimei He,Zhanjun Gu,Bing Tang,Ying Ma,Tianyou Zhai
We report the enhancement of green upconversion luminescence in tetrahedral LiYF4:Yb/Er nanoparticles by Mn2+ ion doping, which is different from the enhanced single-band red emission dominated by Mn2+ ions in cubic NaLnF4:Yb/Er (Ln = Y, Gd, Lu) nanoparticles. The energy levels of the first excited state 4T1 of Mn2+ in tetrahedral LiYF4:Gd and cubic NaGd(Y)F4 are compared by detection of emissions from Mn2+via the energy transition from Gd3+ to Mn2+ with excitation at 275 nm. The coordination environments of Mn2+ in these two host lattices have been investigated by X-ray absorption fine structure measurements. The results demonstrate that the formation of tetrahedral MnF4 in tetragonal LiYF4 arising from the replacement of Ln3+ ions with Mn2+ ions leads to a higher energy level of the Mn2+ 4T1 state than that in octahedral MnF6 in cubic NaYF4. The high-lying excited state of tetrahedral MnF4 is close to the green emitting 4S3/2 state of Er3+ and thus enhances green upconversion emission in tetragonal LiYF4:Yb/Er, while the low-lying excited state of octahedral MnF6 dominates red emission in cubic NaYF4:Yb/Er. These findings provide direct evidence for the key roles of the host lattices and more possibilities in modulating the upconversion behaviour of lanthanide-based nanoparticles by transition-metal ion doping to achieve the desired goals of specific applications.
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Analytical Methods
·
2017
·Vol. 9
·期 22
·3296-3301
·
IF 1.9
Lei Wang,Yuan Ji,Yuezhen He,Lun Wang,Hongqi Chen
Li+-Doped NaYF4:Yb,Er upconversion luminescent nanoparticles (UCLNPs) were synthesized and modified with poly(acrylic acid) (PAA). The luminescence of the carboxyl-functionalized UCLNPs at 664 nm was quenched in the presence of cupric ions (Cu2+) due to the coordination of Cu2+ with the carboxyl group of PAA. When pyrophosphate ions (PPi) were added, the luminescence of the UCLNPs was restored due to the competitive binding of PPi with Cu2+. However, pyrophosphatase (PPase) could promote the hydrolysis of PPi, thus releasing Cu2+, leading to requenching of the luminescence. Under optimal conditions, the luminescence response was virtually proportional to the activity of the PPase between 0.500 and 50.0 mU mL−1, and the limit of detection was 0.441 mU mL−1. Based on the competition assay approach, a new highly sensitive method in the red region for real-time detection of PPase activity was developed.
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RSC Advances
·
2017
·Vol. 7
·期 43
·26633-26639
·
IF 3.108
Chenxi Song,Shubiao Zhang,Quan Zhou,Lei Shi,Linying Du,Defu Zhi,Yinan Zhao,Yuhong Zhen,Defeng Zhao
β-NaYF4:Yb,Er upconversion nanoparticles (UCNPs) were synthesized by a one-pot solvothermal method. The UCNPs were characterized through X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) to prove that they possessed hexagonal crystal phase with uniform particle size distribution. The cationic solid lipid nanoparticles (CSLNs) were then obtained by coating the UCNPs with a lipid. Further analysis by FTIR, XRD and TEM indicated the lipid can successfully coat UCNPs, and the coating process had no obvious influences on morphology and crystallization of the UCNPs. Furthermore, the CSLNs were used for bioimaging in cells and delivering small interfering RNA (siRNA). Cellular bioimaging and upconversion luminescence studies clearly demonstrated that the CSLNs could effectively enter into cells with the help of the lipid. Silencing assays and cytotoxicity in A549 cells convincingly showed that the CSLNs could effectively deliver siRNA and possessed low cytotoxicity and good biocompatibility. Thus, the bifunctional CSLNs could be used as a potential candidate in bioimaging and therapeutic applications.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2019
·
IF 3.261
Zhengquan Liu,Lan Yang,Min Chen,Quansheng Chen
In this work, a label-free fluorimetric method for sensitive and selective detection of Cr(III) was developed by utilizing NaY/GdF 4 :Yb,Er upconversion nanoparticles (UCNPs) and citrate-modified silver nanoparticles (Cit-AgNPs) mixed system. The photophysical and morphological properties of the prepared UCNPs were characterized by various spectroscopic and microscopic techniques. The fluorescence of amino-modified UCNPs can be quenched due to the Cr(III) induced aggregation of Cit-AgNPs by means of inner filter effect. The observed quenching in the fluorescence intensity of the UCNPs is found to be dependent on the concentration of Cr(III). The fluorescence decreases linearly within the investigated concentration of 0.5–40 μM Cr(III) with a limit of detection 34 nM. The practical applicability of the present sensing method is ascertained by detecting Cr(III) in spiked tap water and instant tea samples.
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Small
·
2024
·
IF 13
Weijin Yang,Cheng Bu,Min Zhao,Yafei Li,Shihai Cui,Jing Yang,Hongzhen Lian
In this work, novel ternary composite ZIF-67/Ag NPs/NaYF 4 :Yb,Er is synthesized by solvothermal method. The photocatalytic activity of the composite is evaluated by sulfadiazine (SDZ) degradation under simulated sunlight. High elimination efficiency of the composite is 95.4% in 180 min with good reusability and stability. The active species (h + , ·O 2 − and ·OH) are identified. The attack sites and degradation process of SDZ are deeply investigated based on theoretical calculation and liquid chromatography-mass spectrometry analysis. The upconversion mechanism study shows that favorable photocatalytic effectiveness is attributed to the full utilization of sunlight through the energy transfer upconversion process and fluorescence resonance energy transfer. Additionally, the composite is endowed with outstanding light-absorbing qualities and effective photogenerated electron–hole pair separation thanks to the localized surface plasmon resonance effect of Ag nanoparticles. This work can motivate further design of novel photocatalysts with upconversion luminescence performance, which are applied to the removal of sulphonamide antibiotics in the environment.
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ACS Applied Materials & Interfaces
·
2026
·
IF 7.8
Ziying Wang,Xinyu Li,Sihan Yang,Xuejiao Wang,Ji-Guang Li
The development of upconversion (UC) luminescent materials with negative thermal expansion (NTE) is of great importance to achieve high-performance temperature sensing. However, simultaneously enhancing UC luminescence and moisture resistance to overcome performance limitations remains a major challenge. In this work, an aliovalent cation substitution strategy is designed in which (NaMg)3+, (KMg)3+, and (RbMg)3+ are used to replace the Sc3+ in Sc2Mo3O12: Yb, Er phosphor, leading to significant structure transformation and remarkable enhancement in luminescence and moisture resistance. Among them, NaMgScMo3O12: Yb, Er exhibited a 29-fold enhancement in emission intensity and an increase in the water contact angle from 22.15° to 29.25°. Due to the efficient energy transfer induced by NTE effect, the emission intensity of NaMgScMo3O12: Yb, Er is 17 times higher than that of Sc2Mo3O12:Yb, Er at 548 K. The temperature sensing capability of NaMgScMo3O12: Yb, Er is investigated using the fluorescence intensity ratio (FIR) technique, revealing a maximum relative sensitivity (SR) of 1.17% K–1 (323 K). Furthermore, a superhydrophobic flexible film (water contact angle of 134.68°) temperature sensor is fabricated for monitoring ceramic heating element, achieving a low temperature uncertainty of 0.23–1.12 K. This work provides an approach for temperature sensing with NTE luminescent materials.
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Small
·
2026
·
IF 11.8
Wuxi Zhang,Jianyu Li,Yangke Cun,Xinmin Bai,Yingzhu Zi,Zan Xu,Jianbei Qiu,Zhaoyu Ma,Junying Zhang,Zhengwen Yang
Most widely-studied semiconductor catalysts have low efficiency in utilizing near-infrared (NIR) light in the solar spectrum, while also facing major issues such as slow charge-carrier migration rate and lack of active sites that limit photocatalytic performance. Here, a new strategy to promote the solar-light driven photocatalytic activity of ZnIn 2 S 4 was proposed by introducing Rh single atom (SAs) into CeO 2 :Yb,Er/ZnIn 2 S 4 with photo-thermo-electric effects. The introduction of Rh SAs into ZnIn 2 S 4 effectively suppresses charge recombination, and improves reaction rate through photo-thermal effect. CeO 2 :Yb, Er converts NIR light into visible light via up-conversion photo-optical processes and generates high-energy electrons via two-photon photo-electronic process, both of which can activate ZnIn 2 S 4 . Large contact area and strong interface electric field between CeO 2 and ZnIn 2 S 4 enhance photo-electric conversion efficiency. The CeO 2 :Yb,Er/Rh-ZnIn 2 S 4 exhibits a hydrogen production rate of up to 99.68 mmol·g −1 ·h −1 at 10°C and 148.06 mmol·g −1 ·h −1 with non-temperature-controlled conditions. Under mild conditions, the photocatalysts can convert glucose into high-value-added chemicals (e.g., arabinose) while simultaneously generating hydrogen. This work provides a new strategy to improve NIR light utilization efficiency and enhance charge-carrier separation capability through photo-thermo-electric effects, promoting the production of green hydrogen and biomass conversion into high-value-added chemicals.
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高影响因子
DALTON TRANSACTIONS
·
2021
·Vol. 50
·期 22
·7826-7834
·
IF 4.39
Xiangyu Zhang,Jialing Wu,Peng Wang,Jie Gao,Feng Gao,Dangli Gao
The majority of the fabrication procedures of lanthanide-doped materials involve thermal treatment that often results in crystallite regrowth, stabilizing the specific crystal structure and resulting in luminescence enhancement. The efficiency and intensity of up-conversion luminescence are closely related to the structure and synthesis process of the materials. Herein, well-crystallized and pure tetragonal NaY(MoO4)2 microcrystals with a uniform octahedral shape have been successfully synthesized via an environmentally friendly hydrothermal method, followed by annealing treatment. The phases, structures, morphologies, and compositions of the synthesized products annealed at 500–1000 °C remain unchanged, indicating high thermal stability. Furthermore, the NaY(MoO4)2:Yb3+/Er3+ microcrystals exhibit strong green emission when irradiated using infrared (980 nm) or ultraviolet (378 nm) wavelengths. Upon 980 nm excitation, up to 37-fold luminescence enhancement is achieved when the samples are annealed at about 700 °C. Interestingly, the high colour purity of the strong green emission is not only independent of the dopant concentration and heat treatment temperature, but it is also independent of the excitation conditions, including power and wavelength, and this makes it particularly suitable as a green safety signal light and luminescent security ink in paintings. As-prepared safety inks with NaY(MoO4)2:Yb3+/Er3+ microcrystals were used for visual fingerprint recognition printed on A4 paper with three-level fingerprint security features, significantly increasing the difficulty of illegal imitation and enhancing the levels of anti-counterfeiting.
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高影响因子
RSC Advances
·
2018
·Vol. 8
·期 23
·12944-12950
·
IF 2.936
Yang Su,Li-Na Hao,Kun Liu,Jun Zhang,Liang Dong,Yunjun Xu,Yang Lu,Hai-Sheng Qian
Upconversion core–shell nanoparticles have attracted a large amount of attention due to their multifunctionality and specific applications. In this work, based on a NaGdF4 sub-10 nm ultrasmall nanocore, a series of core–shell upconversion nanoparticles with uniform size doped with Yb3+, Er3+ and NaDyF4 shells with different thicknesses were synthesized by a facile sequential growth process. NaDyF4 coated upconversion luminescent nanoparticles showed an obvious fluorescence quenching under excitation at 980 nm as a result of energy resonance transfer between Yb3+, Er3+ and Dy3+. NaGdF4:Yb,Er@NaDyF4 core–shell nanoparticles with ultrathin layer shells exhibited a better T1-weighted MR contrast.
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