JOURNAL OF ALLOYS AND COMPOUNDS
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2022
·
IF 6.371
Zhan Shu,MengQi Li,Lu Gan,Lijia Wan,Xiaoling Chen,Xiaohang Zhang,Weijun Gui
Highly luminescent GdVO 4 :Eu 3+ /carbon dots (CDs) nanocomposite was synthesized by hydrothermal deposition method for the first time. With the use of dialyzed CDs solution as precursor, the synthetized composite shows negligible emission intensity of CDs. On replacing the dialyzed CDs solution with the crude one, highly luminescent composite can be obtained successfully. Based on the analysis of XPS and FT-IR spectra, one can deduce that the existence of a large amount of citrate anions, ethylenediamine cations and polymer-like CDs in the crude CDs solution make it as nutrient solution of CDs, which can not only facilitate growth of CDs on the surface of GVE, but also greatly prevent nitrogen atoms from falling off the particles during the hydrothermal deposition process. For the dialyzed CDs solution, due to the ions and polymer-like CDs being thoroughly dialyzed, the coated CDs are fragile during hydrothermal deposition process. Besides, the effects of different dosages of ammonia on emission intensities of the two composites are studied. Based on the designable patterns for security application, one can think that the highly luminescent composite is one of the most promising candidates in the anti-counterfeiting field.
研究领域:
材料科学
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光学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
LUMINESCENCE
·
2023
·Vol. 38
·期 8
·1521-1528
·
IF 2.9
Zhan Shu,Mingzhe Du,Mengqi Li,Yanghui Liu,Lu Gan,Xiaohang Zhang,Weijun Gui
To obtain optimal luminescence, 0.12 g of GdVO 4 :3%Eu 3+ nanocrystals (NCs) and different volumes of nitrogen-doped carbon dots (N-CDs) crude solution were used as precursors, and the composite synthesized using the hydrothermal deposition method showed optimal luminescence when 11 ml (2.45 mmol) crude solution was used. In addition, similar composites with the same molar ratio as GVE/cCDs(11) were also prepared with the hydrothermal and physical mixing processes. Based on the test results of XRD, XPS, and PL spectra, for the composite GVE/cCDs(11), the highest (lowest) peak intensity of the C–C/C=C (C=O/C=N) bond, which was 1.18 (0.75) times that of GVE/cCDs-m, indicated most N-CDs deposition and led to their highest emission intensity under 365 nm excitation, although nitrogen atoms in the composite were shed slightly during the deposition process. Finally, as can be seen from the patterns designed for security applications that the optimally luminescent composite is one of the most promising candidates in the anti-counterfeiting field.
研究领域:
材料科学
·
化学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 6
·8149-8156
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IF 2.478
Yun Rui,Luo Li,He Jingqi,Wang Jiaxi,Li Xiaofen,Zhao Weiren,Nie Zhaogang
Lanthanide-doped system with adjustable multicolor and white up-conversion (UC) emission has been developed in GdVO 4 (GVO): Tm 3+ -Ho 3+ -Yb 3+ /-Nd 3+ phosphors, which are fabricated via a facile solid-state reaction. Herein, we study their phase structures and the Ho 3+ concentration effect on their up-conversion emission. Under 980 nm excitation, the Tm 3+ -Ho 3+ -Yb 3+ tri-doped GVO phosphors exhibit intense luminescence combined with red, green and blue (RGB) emission and the successive energy transfer between Tm 3+ -Ho 3+ -Yb 3+ ions causes a slight shift in the color coordinates of samples with different doping concentrations. Under 808 nm excitation, the color coordinate of the optimum GVO: Tm 3+ -Ho 3+ -Yb 3+ -Nd 3+ phosphor is located at (0.3277, 0.3433), which is closest to the ideal white light emission corresponding to (0.3333, 0.3333). Therefore, it is proved that these phosphors provide potential applications in the fields of displays, lasers and optical telecommunication.
研究领域:
材料科学
·
光学
·
光子学
✓ 已验证
DOI
高影响因子
RARE METAL MATERIALS AND ENGINEERING
·
2014
·
IF 0.153
Zhiqiang Zhou,Guo Li,Peiyun Jia
GdVO 4 :Eu 3+ nanophosphors were prepared via molten salt synthesis. Equal moles of NaNO 3 and KNO 3 were used as reaction medium, rare earth nitrates and NH 4 VO 3 as precursors, and NaOH as alkalizer. X-ray diffraction (XRD), Fourier transform infrared (FT-IR), transmission electron microscopy (TEM), photoluminescence (PL) spectrum and lifetime were used to characterize the nanophosphors. XRD demonstrates that NaOH concentration and the sintering temperature play important roles in the crystallinity and the phase purity of the products. The optimum NaOH concentration and sintering temperature are 2:40 and 400 °C, respectively. TEM micrographs show that the GdVO 4 :Eu 3+ nanocrystals exhibit a cubic morphology and have a mean size of about 20 nm, which is in good agreement with that calculated by Scherrer's formula. Both the cell parameters and the volume of GdVO 4 :Eu 3+ nanocrystals decrease due to the existence of big quantity of dangling bonds on the particle surface. Upon excitation at 315 nm, the GdVO 4 :Eu 3+ nanocrystals show the strong characteristic emission of Eu 3+ , which indicates the efficient energy transfer from VO 4 3- groups to Eu 3+ . The best doping concentration of Eu 3+ in GdVO 4 is determined to be 5 mol%.
研究领域:
材料科学
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纳米技术
·
光学
✓ 已验证
DOI
高影响因子
Nanoscale
·
2014
·Vol. 6
·期 20
·12042-12049
·
IF 6.739
Kai Dong,Enguo Ju,Jianhua Liu,Xueli Han,Jinsong Ren,Xiaogang Qu
Multimodal molecular imaging has recently attracted much attention on disease diagnostics by taking advantage of individual imaging modalities. Herein, we have demonstrated a new paradigm for multimodal bioimaging based on amino acids-anchored ultrasmall lanthanide-doped GdVO4 nanoprobes. On the merit of special metal–cation complexation and abundant functional groups, these amino acids-anchored nanoprobes showed high colloidal stability and excellent dispersibility. Additionally, due to typical paramagnetic behaviour, high X-ray mass absorption coefficient and strong fluorescence, these nanoprobes would provide a unique opportunity to develop multifunctional probes for MRI, CT and luminescence imaging. More importantly, the small size and biomolecular coatings endow the nanoprobes with effective metabolisability and high biocompatibility. With the superior stability, high biocompatibility, effective metabolisability and excellent contrast performance, amino acids-capped GdVO4:Eu3+ nanocastings are a promising candidate as multimodal contrast agents and would bring more opportunities for biological and medical applications with further modifications.
研究领域:
纳米技术
·
生物医学工程
·
分子成像
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanoscale
·
2012
·Vol. 5
·期 1
·253-261
·
IF 5.914
Xiaojiao Kang,Dongmei Yang,Yunlu Dai,Mengmeng Shang,Ziyong Cheng,Xiao Zhang,Hongzhou Lian,Ping'an Ma,Jun Lin
In this study, multifunctional poly(acrylic acid) modified lanthanide-doped GdVO4 nanocomposites [PAA@GdVO4: Ln3+ (Ln = Yb/Er, Yb/Ho, Yb/Tm)] were constructed by filling PAA hydrogel into GdVO4 hollow spheres via photoinduced polymerization. The up-conversion (UC) emission colors (green, red and blue) can be tuned by changing the codopant compositions in the matrices. The composites have potential applications as bio-probes for cell imaging. Meanwhile, the hybrid spheres can act as T1 contrast agents for magnetic resonance imaging (MRI) owing to the existence of Gd3+ ions on the surface of composites. Due to the nature of PAA, DOX-loaded PAA@GdVO4:Yb3+/Er3+ system exhibits pH-dependent drug releasing kinetics. A lower pH offers a faster drug release rate. Such character makes the loaded DOX easily released at cancer cells. The cell uptake process of drug-loaded composites was observed by using confocal laser scanning microscopy (CLSM). The results indicate the potential application of the multifunctional composites as theragnostics (effective bimodal imaging probes and pH-responsive drug carriers).
研究领域:
材料科学
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纳米技术
·
生物医学工程
·
分子生物学
·
药学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 13.2
Yi-Cheng Geng,Xiang-Bing Li,An-Qi Wang,Bing-Yi Xi,Qian-Qian Zhang,Li-He Yan,Fa-Ming Li,Wei-Dong Zhu
Currently, triethylamine gas sensors based on semiconducting metal oxides generally suffer from issues such as high operating temperatures and relatively high detection limits (typically at the ppm level). To address the aforementioned issues, this study successfully synthesized GdVO 4 -In 2 O 3 composite materials using a two-step hydrothermal method. Benefiting from the formation of an n-n heterojunction and the introduction of oxygen vacancies, this composite material exhibits outstanding gas-sensing performance at lower operating temperatures. At an operating temperature of 80 °C, the sensor exhibits a response value of 5011 to 100 ppm triethylamine, representing 172.72 times and 43.35 times the response of pure GdVO 4 and In 2 O 3 , respectively. The operating temperature is correspondingly reduced by 68% and 55.56%. Additionally, the sensor exhibits a response value of 15.26 for triethylamine at concentrations as low as 50 ppb, with a linear fit determination coefficient of 0.995 within the 50–1000 ppb concentration range. Currently, research reports on GdVO 4 -based gas sensors remain limited. This study successfully synthesized GdVO 4 -In 2 O 3 composite materials for the first time, providing an effective solution for low-temperature detection of triethylamine at the ppb level while expanding the research framework for GdVO 4 -based gas sensors.
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 12
·9612-9618
·
IF 3.289
Ming Chen,Jia-Hong Wang,Zhi-Jun Luo,Zi-Qiang Cheng,Ya-Fang Zhang,Xue-Feng Yu,Li Zhou,Qu-Quan Wang
Metal/rare-earth core/shell hetero-nanostructures combine the optical properties of metal cores and rare-earth shells, which are widely reported and expected to be used in multitask applications. However, there is still no facile and efficient strategy to directly prepare such materials. Herein, we present a facile hydrothermal method for directly coating rare-earth vanadate shells onto the Au nanoparticle (AuNP) cores. Citrate plays a fascinating and critical role in the whole synthesis process, and not only acts as the capping agent to stabilize the as-prepared AuNP cores and the final products but also serves as the complexing agent to assist the nucleation and growth of rare-earth vanadate shells. Interestingly, the grown Au/GdVO4:Eu core/shell NPs have a flower-like shape with tunable plasmon resonance and bright fluorescence. The morphology and crystallinity as well as the growth mechanism and tunable optical properties of the Au/GdVO4:Eu are investigated. The method developed here could be extended for preparing other metal/rare-earth hybrids and the multifunctional products with specific morphology have the potential in the photocatalytic and biomedical application.
研究领域:
材料科学
·
纳米技术
·
光学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）