JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Hanzhi Yao,Yuchi Zhang,Yan Xu
Self-calibrated optical luminescent thermometers were prepared based on Eu 3+ /Mn 2+ co-doped Zn 2 GeO 4 phosphors with controllable morphology via a facile hydrothermal synthesis process. The co-doped concentration of Eu 3+ ions in Zn 2 GeO 4 :Mn 2+ played important roles in the evolution of the morphology and the formation of the dual luminescent emission mode. Depending on different excitation wavelengths ranging from 260 to 360 nm, the dual emission centers located at about 534 nm and 612 nm were ascribed to d - d transition derived from 4 T 1 - 6 A 1 of Mn 2+ ions and f - f transition originated from 5 D 0 - 7 F 2 of Eu 3+ ions, respectively, which gave rise to the excellent self-calibrating temperature sensing functions. The related luminescent and sensing mechanism of the Eu 3+ /Mn 2+ co-doped Zn 2 GeO 4 phosphors are also proposed. The as-obtained Eu 3+ /Mn 2+ co-doped Zn 2 GeO 4 phosphors had a high relative sensitivity ( S r ) of 1.96% ºC −1 between 20 and 80 °C, as well as stable reusability, demonstrating its superiority as a ratiometric luminescent thermometer for temperature sensing applications.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
DYES AND PIGMENTS
·
2017
·
IF 3.473
Yanshen Li,Ankang Zhao,Chunyan Chen,Cuimiao Zhang,Jinyu Zhang,Guang Jia
A variety of uniform and well-dispersed one-dimensional Zn 2 GeO 4 :Mn 2+ phosphors have been synthesized via a facile solvothermal process with H 2 O/EG as solvent. During the synthesis process, the component of solvent and the addition of PEG surfactant play an important role in determining the structure, particle size, and morphology of the final product. Under ultraviolet light excitation, the pure Zn 2 GeO 4 sample shows bluish-white emission which is attributed to the native defects present in the Zn 2 GeO 4 host. When Zn 2+ ions are partially substituted by Mn 2+ , the as-synthesized Zn 2 GeO 4 :Mn 2+ samples exhibit intense green emission that corresponds to the d-d transition ( 4 T 1 → 6 A 1 ) of Mn 2+ ions. The luminescence mechanisms of the Zn 2 GeO 4 :Mn 2+ samples were investigated in detail by using the CASTEP code based on density functional theory (DFT). It is expected that the as-synthesized Zn 2 GeO 4 :Mn 2+ phosphors can be potentially applied in lighting, optical displays, and optoelectronic devices .
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
DYES AND PIGMENTS
·
2018
·
IF 3.767
Yuchi Zhang,Hanzhi Yao,Yan Xu,Zhiguo Xia
Engineering novel ratiometric temperature sensors with high temperature sensitivity is still of a great challenge in versatile temperature measurement fields. Herein, a self-calibrated optical luminescent thermometer based on Eu 3+ /Mn 2+ dual-activator was fabricated in the same nanocomposite system, which integrated the photoluminescence originated from the temperature-insensitive Eu-metal organic framework with weak coupling effect and the temperature-sensitive Zn 2 GeO 4 :Mn 2+ with strong coupling effect. Specifically, the as-prepared nanocomposites composed of lanthanide MOF Eu-BTC (BTC = 1,3,5-benzenetricarboxylic acid) and Zn 2 GeO 4 :Mn 2+ nanorods possessed Eu 3+ /Mn 2+ dual red/green emission, which displays excellent ratiometric temperature-sensing functions and also has high relative sensitivity ( S r ) of 4.1% ºC −1 when they are used as ratiometric luminescent thermometer in the physiological temperatures (25–45 °C). These results demonstrate that such a design strategy with synergistic weak/strong coupling luminescence is useful and the as-obtained Eu-MOF/Zn 2 GeO 4 :Mn 2+ nanocomposites can be potential for temperature sensor applications.
研究领域:
材料科学
·
光学工程
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
OPTIK
·
2021
·
IF 2.443
Simin Cui,Yiran Jiao,Jiangyong Liu,Yuan Pu,Jie-Xin Wang,Dan Wang
Deep-ultraviolet (DUV) light devices are receiving widely attention due to their potential use in sterilization and water purification , in particularly, during the COVID-19 pandemic. Photoluminescence detectors that demonstrate the existence of DUV light invisible to our eyes are of importance. Herein, we propose a process intensified approach via high-gravity reactive precipitation combined with hydrothermal synthesis for production of Mn 2+ doped zinc orthogermanate (Zn 2 GeO 4 : Mn 2+ ) nanophosphors for deep-ultraviolet detecting. The rotating packed bed (RPB) was used as the reactor for process intensification of the reactive precipitation and the whole processing time was significantly reduced. The Zn 2 GeO 4 : Mn 2+ phosphors show green emission upon ultraviolet or near ultraviolet excitation. In optimized conditions, the products show a sub-microrod morphology with average size of about 200 nm. Under the excitation of 254 nm light, the Zn 2 GeO 4 : Mn 2+ nanophosphors exhibit bright green emission at peak wavelength of 535 nm.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
DYES AND PIGMENTS
·
2022
·
IF 5.122
Zishuo Yi,Weiling Huang,Yan Xu
Dual-emitting ratiometric optical thermometers with the advantages of excellent self-calibration and high-sensitivity have become a research hot spot. Herein, a dual-emissive 4-methylumbelliferone encapsulated ZIF-8 (ZIF-8⊃4-MU) modified Zn 2 GeO 4 :Mn 2+ nanocomposite was simply prepared by adding Zn 2 GeO 4 :Mn 2+ nanorods into a methanol solution containing 4-methylumbelliferone (4-MU), zinc (II) nitrate hexahydrate, and 2-methylimidazole. Accompanying with the self-assembly of ZIF-8⊃4-MU, the binding affinity of Zn 2+ ions to the surface of Zn 2 GeO 4 :Mn 2+ nanorods enables the formation of ZIF-8⊃4-MU@Zn 2 GeO 4 :Mn 2+ nanocomposite. The photoluminescence violet-blue (420 nm) and green emissions (531 nm) of the nanocomposite can be ascribed to the two independent luminescent centers of 4-MU dyes confined in ZIF-8 and the characteristic transition of 4 T 1 - 6 A 1 for Mn 2+ ions doped in Zn 2 GeO 4 , respectively. The fluorescent intensity ratios (FIRs) of 4-MU to Mn 2+ (I 420 nm /I 531 nm ) showed excellent self-calibrating temperature monitoring functions with a maximum relative sensitivity (S r ) of 1.82%· o C −1 and stable reusability in the temperature range of 20–100 °C. Also, the ZIF-8⊃4-MU@Zn 2 GeO 4 :Mn 2+ hybridized polyvinyl alcohol (PVA) transparent film showed a similar multi-emitting behavior, as well as good processability and tensile properties . Benefiting from the excitation-dependent emitting property of ZIF-8⊃4-MU@Zn 2 GeO 4 :Mn 2+ , a multiple optical encryption of digital information was successfully realized based on a two-dimensional code, achieving an enhanced security level for preventing counterfeiting. This proof-of-concept study offers a feasible assembled way in fabricating multi-mode luminescent nanocomposites for ratiometric temperature sensing and information encryption .
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
TALANTA
·
2021
·
IF 6.057
Zipeng Yin,Ling Zhu,Zijian Lv,Meijin Li,Dianping Tang
Persistent luminescent nanoparticles (PLNPs) are a class of materials with excellent optical properties , which can continue to emit light for a long time after removing the excitation light source. This feature enables PLNPs to be used for development of biological detection modes without autofluorescence background. In this study, we prepared Zn 2 GeO 4 : Mn 2+ , Pr 3+ (ZGOMP) nanorods through a one-pot hydrothermal method . Using the pH-responsive luminescence behavior of ZGOMP, we developed an autofluorescence-free biosensor using ZGOMP as a probe and gluconic acid as a quencher to detect prostate-specific antigen (PSA). Hybridization chain reaction (HCR) and magnetic separation system were introduced in the design to achieve efficient signal amplification. Under the optimal conditions, the as-designed autofluorescence-free sensing platform showed high selectivity , and showed a good luminescence response to PSA within the linear range of 0.001–10 ng/mL at a detection limit of 0.64 pg/mL. The excellent analytical performance shows that the current strategy provides an effective platform for clinical sample analysis.
研究领域:
生物传感
·
纳米技术
·
分析化学
·
医学诊断
✓ 已验证
产品关联
DOI
PubMed
高影响因子
TALANTA
·
2020
·
IF 5.339
Yuan-Yuan Jiang,Xu Zhao,Li-Jian Chen,Cheng Yang,Xue-Bo Yin,Xiu-Ping Yan
Serious ochratoxin A (OTA) contamination necessitates the development of rapid, sensitive and selective analytical methods for its determination in food safety. Herein, we report a persistent luminescence resonance energy transfer (LRET) based aptasensor for the autofluorescence-free detection of OTA. OTA aptamer functionalized persistent luminescence nanorod (PLNR) Zn 2 GeO 4 :Mn 2+ and the aptamer complementary DNA modified gold nanoparticle (AuNP) were used as the donor and the acceptor, respectively. The developed LRET aptasensor integrated the advantages of the long-lasting persistent luminescence of PLNR, the high selectivity of aptamer and the low probe background of LRET sensors, allowing autofluorescence-free detection of OTA in biological samples with high sensitivity and selectivity. The developed LRET aptasensor gave an excellent linearity in the range of 0.01–10 ng mL −1 , the detection limit of 3 pg mL −1 and the precision of 2.7% (RSD, n = 11) at 1 ng mL −1 level. The applicability of the developed aptasensor was demonstrated by analyzing beer samples for OTA with the recoveries of 92.3%–104%.
研究领域:
分析化学
·
食品安全
·
纳米技术
·
毒理学
✓ 已验证
DOI
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2023
·Vol. 415
·期 10
·1877-1887
·
IF 4.3
Wang Yinghui,Yu Ling,Zhang Hui,Zhu Runzhi,Meng Zhe
An accurate and sensitive competitive enzyme-linked immunosorbent assay (ELISA) based on persistent luminescence nanoparticles Zn 2 GeO 4 :Mn 2+ , Eu 3+ (ZGME) was developed for detecting ochratoxin A (OTA), a powerfully toxic mycotoxin usually found in grains. As a signal output element of autofluorescence-free biosensors, ZGME can be integrated into ELISA with glucose oxidase (GOx)-binding OTA molecules due to its excellent pH-responsive persistent luminescence. In the absence of OTA, the OTA-GOx conjugate was captured by the anti-OTA monoclonal antibody (anti-OTA mAb) pre-coated on the 96-well plate. The results indicate a decrease in the pH value of the solution, which triggered the quenching of ZGME luminescence due to GOx-dependent gluconic acid production. The presence of OTA inhibited the binding of OTA-GOx on the plate, thus decreasing the production of gluconic acid and increasing the persistent luminous intensity of ZGME. Under the optimized concentrations of anti-OTA mAb and OTA-GOx, quantitative determination of OTA was achieved by plotting the increase or decrease in persistent luminescence intensity of ZGME at 535 nm. In this study, the linear range was from 0.1 μg L −1 to 63 μg L −1 , and the limit of detection (LOD) was as low as 0.045 μg L −1 . In five food samples (corn grit, brown rice, soybean, rice, and wheat), the results exhibited good stability and repeatability, with a recovery range from 81.3% to 94.4% and a relative standard deviation (RSD) of less than 4.2%. Hence, the established method provides a sensitive, accurate, and autofluorescence-free approach for the determination of OTA in different grain samples.
研究领域:
分析化学
·
毒理学
·
食品科学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）