PACKAGING TECHNOLOGY AND SCIENCE
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2025
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IF 3.7
Wenna Wang,Peng Zhao,Li Cai,Ting Zhao,Yingying Guo,Kexi Sun,Zuju Shu,Lijun Zhang,Zhongbo Li
Developing simple and reliable sensors for food freshness is a key goal in intelligent packaging. In this study, a ratiometric fluorescent nanofibre film was successfully developed for real-time visual monitoring of shrimp freshness. The film was constructed by embedding an amine-responsive fluorophore, fluorescein isothiocyanate (FITC) and a stable reference fluorophore, Eu (DBM) 3 Bpy, into an electrospun polyvinyl alcohol (PVA) matrix. The sensing principle relies on the pH-driven enhancement of FITC's green emission (530 nm) in the presence of biogenic amines, whereas the Eu-complex provides a constant red reference signal (610 nm). This dual-emission system creates a clear fluorescence colour change from orange to yellow-green as shrimp spoils. The sensor exhibited high selectivity and a rapid response, detecting spoilage within 6 h at 25°C. The maximum colour difference (ΔE) reached 64.78, allowing for unambiguous visual detection. This robust and easy-to-fabricate nanofibre film holds great promise for practical applications in food safety and intelligent packaging technology.
研究领域:
食品科学与技术
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传感器与检测技术
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智能包装
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纳米材料
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荧光传感
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PHYSICA SCRIPTA
·
2021
·Vol. 96
·期 12
·125861
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IF 2.487
Bijun Fang,Yu Zhou,Shanshan Zhang,Shuai Zhang,Jianning Ding
Multifunctional performance [(Ba0.85Ca0.15)0.995Eu0.005](Ti0.9Hf0.1)O3 (BCTH-Eu) ceramics were prepared by conventional solid-state low-temperature sintering method via LiBO2 doping, in which the sintering aid LiBO2 was introduced into the calcined perovskite precursor powder through liquid phase coating technique. Phase-pure perovskite structure BCTH-Eu ceramics are obtained by the method, and the sintering temperature is decreased about 150 °C as compared with the conventional method whose sintering temperature is normally above 1450 °C. The ceramics present rather high density, uniform distribution of grains and elementals, and have submicron meter grain size. Due to complex substitution of cations at A-site and B-site of the perovskite structure, the LiBO2-doped BCTH-Eu ceramics exhibit displacive driven normal ferroelectrics accompanied by apparent diffused relaxation characteristic. The 1340 °C sintered LiBO2-doped BCTH-Eu ceramics present maximum piezoelectric constant d33 value of 314 pC/N poled under 20 kV cm−1, and the ceramics sintered between 1320 °C–1330 °C exhibit excellent comprehensive electrical properties and multifunctional performance. Such excellent multifunctional properties obtained in this work can be partially attributed to the coexistence of multi-ferroelectric phases, which is confirmed by dielectric response fitting and Raman Gaussian fitting.
研究领域:
材料科学
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陶瓷工程
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固态物理
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JOURNAL OF MOLECULAR LIQUIDS
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2023
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IF 6
Ying Dai,Yan Li,Wenmei Hu,Qinqin Tao,Zhirong Liu
Lanthanides/actinides separation is of importance in many modern industrial engineering fields, e.g. the circulation of the nuclear fuel and rare earth. N,N-dioctyl diglycol amic acid (briefly as DODGA) is known as an effective extractant for extraction of rare earth metal. In this work, two extractants, [N 1888 ][DODGA] and [N 4444 ][DODGA], were developed by using quaternary ammonium as cations and DODGA as anion. The resultant ionic liquids were used to separate europium from europium-uranium binary component system. The influence of several factors (nitric acid concentration, contact time, temperature, metal ions, extractant concentration, salting agent concentration and stripping) were analyzed. The coordination chemistry of Eu(III) with [N 1888 ][DODGA] and [N 4444 ][DODGA] were investigated by the mole-ratio method. The experimental results confirmed that the separation factors ( SF ) of Eu(III)/U(VI) were reached 55.44 and 60.35 for [N 1888 ][DODGA] and [N 4444 ][DODGA]. The stoichiometry of the complex of Eu(III) and [N 1888 ][DODGA] or [N 4444 ][DODGA] were determined as 1:3. Excellent extraction of the target metals and prominent separation factors using these ionic liquids showed that they were viable to separate lanthanides from actinides.
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LUMINESCENCE
·
2022
·Vol. 37
·期 12
·2050-2058
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IF 2.613
Xin Hou,Xiaohui Wen,Juan He,Xiandeng Hou
Lanthanide metal–organic frameworks Eu(BTB) MOFs was synthesized in low-temperature plasma produced by dielectric barrier discharge (DBD). This DBD synthesis possesses the characteristics of rapid reaction (within 20 min), mild condition (low temperature and atmospheric pressure) and simple operation compared with many traditional synthesis methods. The prepared Eu(BTB) MOF material exhibits typical red light emitting of europium (Eu 3+ ) at 617 nm, which can selectively and sensitively be quenched in the presence of trace iron(III) ion (Fe 3+ ). A simple, fast and sensitive fluorescence sensing strategy of Fe 3+ was thus constructed, with a limit of detection (LOD) of 0.5 μM. Compared with reported fluorescence probes, Eu(BTB) MOFs have also demonstrated the advantages of low cost, easy and fast preparation, great stability, and excellent optical properties, thus making them a promising fluorescence candidate for trace Fe 3+ sensing for the potential application in biological systems in the future.
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PubMed
高影响因子
Crystals
·
2022
·Vol. 12
·期 11
·1608
·
IF 2.67
Zijun Ye,Yu Jiang,Minmin Mao,Zhiyu Xiu,Mengjiao Chi,Guofa Wu,Bing Liu,Dawei Wang,Bin Yang,Kaixin Song
In this work, Y2.95R0.05MgAl3SiO12(R = Yb, Y, Dy, Eu, Sm) microwave single-phase dielectric ceramics were successfully prepared via a conventional ceramic sintering technology by doping a series of rare earth elements (Yb, Y, Dy, Eu, Sm) with different ionic radii for the first time. The effects of A-sites occupied by rare earth elements on the microwave dielectric properties of Y2.95R0.05MgAl3SiO12were studied using crystal structure refinement, a scanning electron microscope (SEM), bond valence theory, P-V-L theory, and infrared reflection spectroscopy. It was found that the ionicity of the Y-O bond, the lattice energy, the bond energy, and the bond valance of the Al(Tet)-O bond had important effects on the microwave dielectric properties. Particularly, the optimum microwave dielectric properties,εr= 9.68,Q×f= 68,866 GHz, andτf= −35.8 ppm/°C, were obtained for Y2.95Dy0.05MgAl3SiO12when sintered at 1575 °C for 6 h, displaying its potential for 5G communication.Keywords:garnet;microwave dielectric properties;P–V–L theory;infrared reflection spectroscopy
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CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Wanyin Ge,Honglei Yin,Chenhui Lu,Xinmeng Zhang,Panpan Song,Mingsheng Ma,Zhifu Liu,Ye Tian
The core issue of light emitting diodes (LEDs) for actual application is the thermal stability of phosphors. Silicon nitride (Si 3 N 4 ) is generally recognized as especially important structural material due to its excellent mechanical properties at extreme high temperature. In this work, Si 3 N 4 : Eu was demonstrated to be an excellent luminescence functional material for LEDs. The discarded corner-waster silicon raw material was utilized to act as the precursor. The Si 3 N 4 :Eu phosphor was synthesized by a facile nitriding process at elevated temperature. The pure α-Si 3 N 4 :Eu nanorods were successfully obtained by adjusting the doping concentration of Eu. It is coexistence with mixed-valence (divalent and trivalent) for Eu in α-Si 3 N 4 according to X-ray photoelectron spectroscopy. The synthesized α-Si 3 N 4 :Eu nanorods showed bright yellow under the excitation of 365 nm (UV) and white luminescence by 460 nm chip (Blue). The Si 3 N 4 :Eu nanorods possess excellent thermal stability, maintains nearly 70% of the origin intensity even at temperatures over 300 °C. The Si 3 N 4 :Eu nanorods demonstrated comparable performance to commercial YAG:Ce 3+ (YAG). Moreover, the long-term thermal stability of Si 3 N 4 :Eu nanorods is superior to commercial YAG, revealing the enhanced service performance. This work not only presents a facile Si 3 N 4 :Eu nanorods green synthesis route from waste utilization, but also offers an enhanced service performance for the high temperature LEDs application.
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Journal of Environmental Chemical Engineering
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2022
·
IF 7.968
Xiaoyu Yang,Boming Tang,Xuejuan Cao
Continuous photocatalysis is achieved by using light-storing assisted photocatalytic composites, but little is known about the interactions between photocatalysts and long afterglow materials. g-C 3 N 4 /Sr 2 MgSi 2 O 7 :(Eu,Dy) with a sustained reaction activity was prepared by pyrolysis polymerization, and its optical-photocatalysis behaviors were studied. It was found that the light absorption ability and NO removal effect were improved, but the luminescence-afterglow performance became worse. The interface model of g-C 3 N 4 /Sr 2 MgSi 2 O 7 :(Eu,Dy) was constructed for the first time. On the basis of experimental analyses, its electronic structure and carrier transfer paths were studied by First-principles calculations, and reasons behind the changes in macro performance were revealed. The results showed that Eu 4 f electrons are difficult to return to the Eu 5d orbits after being captured by C 2p orbits, leading to the reduction of light energy radiation; the built-in electric field and energy band offsets between g-C 3 N 4 and Sr 2 MgSi 2 O 7 :(Eu,Dy) promote the transfer of photoinduced carriers, which follows a traditional type-II mechanism, resulting in enhanced photocatalytic activity and decreased luminescence-afterglow performance. This paper reveals the relationship between optical-photocatalysis behaviors and the electronic structure of g-C 3 N 4 /Sr 2 MgSi 2 O 7 :(Eu,Dy). It provides a reference for designing and optimizing light-storing assisted photocatalytic composites.
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CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Xiaoping Jiang,Yue Guo,Lixi Wang,Qitu Zhang
The integration of dynamic photoluminescence and photochromism to achieve dual-modal characteristics can substantially elevate the security of anticounterfeiting measures. In this study, a novel bifunctional phosphor, namely CaAl 12 O 19 :Eu, Tb possessing dynamic photoluminescence and photochromism, is developed by the sol-gel combustion method. As the duration of exposure to 254 nm ultraviolet radiation increases, the CaAl 12 O 19 :Eu, Tb phosphors exhibit exceptional dynamic luminescent characteristics and pronounced color changes. Furthermore, this exposure results in a photochromic phenomenon on the surface of the samples, causing a shift from white to light brown. With an increase in Tb doping concentration, distinct and diverse chromatic variations easily discernible are observed by the naked eye. In addition, the mechanisms underlying the dynamic photoluminescent and photochromic characteristics are analyzed herein. Furthermore, the application of the bifunctional phosphor CaAl 12 O 19 :Eu, Tb for advanced dual-modal multicolor anticounterfeiting is explored, offering enhanced security against duplication attempts.
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Materials Chemistry Frontiers
·
2021
·Vol. 5
·期 12
·4746-4755
·
IF 6.482
Xiao Gong,Hang Jiang,Mengyan Cao,Zhihui Rao,Xiujian Zhao,Alberto Vomiero
Heavy-metal-free quantum dots (QDs) are promising luminophores for luminescent solar concentrators (LSCs) because of environmental friendliness, which is essential for industrial applications. In order to keep high optical quality and inhibit aggregation-induced quenching, usually QDs can only be loaded at low concentration in a polymer optical waveguide material for LSCs, which significantly impairs the power conversion efficiency (PCE). Thus, it is a challenge to fabricate high-performance LSCs with high QD loading. Here, dual emission Eu-doped ZnO QDs with strong solid-state fluorescence are synthesized via a simple sol–gel method, which enables two characteristic photoluminescence peaks at 551 nm and 614 nm. Furthermore, Eu-doped ZnO QDs with dual fluorescence emission are for the first time reported to be applied in LSCs. The performance of LSCs can be influenced by the loading concentration of Eu-doped ZnO QDs in polyvinyl pyrrolidone (PVP) films. The obtained external optical efficiency (ηopt) of the LSCs based on Eu-doped ZnO QDs can be relatively high (4.37%) compared to the reported LSCs with a similar area when the loading concentration of Eu-doped ZnO QDs is up to 13.2% because of both their high photoluminescence intensity and dual fluorescence emission. Our results demonstrate that dual emission Eu-doped ZnO QDs with strong solid-state fluorescence are promising candidates as luminophores for LSCs.
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CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Hang Zhang,Hang Yang,Guogang Li,Shiqi Liu,Haoran Li,Yuming Gong,Yujun Liang,Yongjun Chen
Currently, phosphor materials play an important role in designing noncontact remote optical thermometers. Although many approaches have contributed to improve thermometric performance of optical thermometers including optimization of host materials, size of nanoparticles , dopant type and concentration as well as excitation density and phonon energy engineering, the development of highly sensitive optical thermometric materials is still a challenge. Hence, we developed novel CaNb 2 O 6 (CNO):Ln 3+ (Ln 3+ = Eu 3+ /Sm 3+ /Dy 3+ /Tb 3+ ) phosphors as highly thermometric materials and proposed a novel strategy for further enhancing its thermometric performance via adding the intensity of indicator signal by co-doping Bi 3+ ions in current phosphor system. Typically, the as-prepared CNO:Ln 3+ phosphors present a broad blue emission around 470 nm originated from NbO 6 octahedral groups and some respective emission lines derived from the characteristic f-f transitions of Ln 3+ ions. Based on the diverse thermal quenching performance between blue emission and Ln 3+ ions emission , the temperature sensitivities of CNO:Ln 3+ were investigated in detail. Among them, the maximum relative sensitivity of CNO:Eu 3+ sample reached 1.991% K −1 in the range of 298–448 K and remained 97% after five temperature cycles. Furthermore, an obvious discoloration was discovered during temperature cycle testing in CNO:Ln 3+ samples under 254 nm UV lamp. Through doping Bi 3+ ion, the strongest intensity of indicator signal is 24 folds that of CNO host. Correspondingly, the relative sensitivity of CNO:Bi 3+ , Eu 3+ sample is obviously improved to 3.793% K −1 in the range of 298–523 K, owing to a larger range of the FIR value and a wider drop range of indicator signal. This work opens up an effective pathway to improving thermometric performance of optical thermometers by enhancing the intensity of indicator signal of employed phosphor materials.
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BIOSENSORS & BIOELECTRONICS
·
2019
·
IF 9.518
Yu Cui,Fei Chen,Xue-Bo Yin
A Eu-metal organic framework (Eu-MOF) probe with dual-emission was reported for the ratiometric fluorescence detection of H 2 O 2 and glucose. Because of the special nucleophilic reaction between boric group and H 2 O 2 , Eu 3+ and 5-boronobenzene-1,3-dicarboxylic acid (BBDC) were selected to synthesize the functional MOF probe via a simple one-pot solvothermal method . The Eu-MOF shows dual-emission at 370 and 623 nm with the single excitation at 270 nm due to the energy transfer efficiency change for antenna effect procedure. After addition of H 2 O 2 , the red emission of Eu-MOF weakened and the blue emission enhances immediately under 270 nm irradiation, so the ratiometric fluorescence detection is established. Moreover, the obvious color change for visual measuring of H 2 O 2 and glucose is illustrated to reveal the merit of Eu-MOF probe. The proposed method was demonstrated to be highly sensitive and selective for H 2 O 2 and glucose, with the low detection limits of 0.0335 and 0.0643 μM, respectively. The established boric-acid-functional Eu-MOF sensing platform was proved as the powerful probe for H 2 O 2 and the metabolites involved in H 2 O 2 -generating reaction.
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高影响因子
INORGANIC CHEMISTRY
·
2019
·
IF 4.85
Xinrui Zhang,Xianghe Kong,Liyong Yuan,Zhifang Chai,Weiqun Shi
Tetradentate 1,10-phenanthroline-2,9-dicarboxamide (PDAM) derivatives have been well documented as effective binding ligands toward MA(III) and Ln(III), while the structural analysis and species determination of the complexes are still limited. Herein, we report a combined study on the coordination of Eu(III) with PDAM derivatives using electrospray ionization mass spectrometry (ESI-MS), time-resolved laser-induced fluorescence (TRLIF), and density functional theory (DFT) calculations. PDAM derivatives here involve N,N′-diethyl-N,N′-diethyl-2,9-diamide-1,10-phenanthroline (Et-Et-DAPhen), N,N′-dibutyl-N,N′-dibutyl-2,9-diamide-1,10-phenanthroline (But-But-DAPhen), and N,N′-dihexyl-N,N′-dihexyl-2,9-diamide-1,10-phenanthroline (Hex-Hex-DAPhen). The collision-induced dissociation (CID) test shows that these alkyl-DAPhen ligands coordinate strongly with Eu(III), given that the coordination moieties remain intact during CID. The 1/2 EuIII–L species was found to be the dominant component for all three ligands, as evidenced by ESI-MS and fluorescence titration. The fluorescence decay results indicate that the hydration numbers of Eu(III) are reduced from 9 to 1 upon complexation, in agreement with the fact that the 1/2 EuIII–L species are formed, and eight water molecules are exactly replaced by eight donor atoms of two alkyl-DAPhen ligands. In addition, the DFT calculations suggest that the 1:2 EuIII–L species is more stable than the 1/1 EuIII–L species and the Eu–oxygen/nitrogen (Eu–O/N) bonds have a dominant ionic character, with the O atoms having stronger electron-donating abilities toward Eu(III) in comparison to the N atoms.
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