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Cui Z.,Changchun Institute of Technology | Ren H.,Changchun Institute of Technology | Zheng C.,Changchun Institute of Technology | Chen F.,State Key Laboratory of Rare Earth Resource Utilization | Hong G.,State Key Laboratory of Rare Earth Resource Utilization
Journal of Nanoscience and Nanotechnology | Year: 2010

The nanoscale luminescent complex of europium (III)-pyromellitic acid was synthesized successfully in the polyvinylpyrrolidone (PVP) matrix by a co-precipitation method. The chemical formula of the synthesized complex was speculated to be PVP/Eu 4/3L-3H 2O by elemental analysis, inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and Fourier-transform infrared spectroscopy (FT-IR). The X-ray diffraction (XRD) pattern of PVP/Eu 4/3L. 3H 2O indicated that it was a new crystalline complex since the diffraction angle, diffraction intensity, and distance of the crystal plane were all different from those of the ligand. It is proved by the thermogravimetric curve that the synthesized nanoscale luminescent complex was stable, ranging from ambient temperature to 479 °C in air. The transmission electron microscopy (TEM) image showed that the complex was nanoparticles. The synthesized complex emitted the characteristic red fluorescence of Eu(III) ions under ultraviolet excitation by the photoluminescence analyses. For example, the emission peaks of PVP/Eu 4/3L-3H 2O at 578, 591, 612, and 694 nm using 322 nm as exciting wavelength are assigned to the 5D 0 → 7F 0, 5D 0 → 7F 1, 5D 0 → 7F 2, and 5D 0→ 5F 4 electron transitions of the Eu 3+ ions, respectively Copyright © 2010 American Scientific Publishers All rights reserved.


Sun D.-H.,Changchun Institute of Technology | Zhang J.-L.,State Key Laboratory of Rare Earth Resource Utilization | Sun D.-X.,Changchun Institute of Technology
Journal of Nanoscience and Nanotechnology | Year: 2010

Monoclinic monazite-type EuPO 4 and LaPO 4:Eu nanorods were synthesized by a microemulsionassisted solvothermal method. Their morphologies, structures, and fluorescent properties were characterized by SEM, XRD, and photoluminescence (PL) modern analytic means, respectively. The aspect ratios of EuPO 4 and LaPO 4:Eu nanorods have a decreasing tendency with increasing carbon chain length of assisted surfactants. When the assisted surfactant was n-butyl alcohol, the EuPO 4 exhibited nanorod morphology with diameters from 20 to 30 nm and lengths from 100 to 150 nm. When the assisted surfactant was n-pentanol, the EuPO 4 nanorods had lengths between 200 and 300 nm and a diameter range similar to that of the n-butyl alcohol nanorods. When the assisted surfactant was n-hexanol and n-octyl alcohol, only elliptical EuPO 4 products were obtained. The LaPO 4:Eu nanorods synthesized in the presence of different assisted-surfactants exhibited elliptical morphologies with diameters of 40-60 nm and lengths of 70-110 nm. The LaPO 4:Eu and EuPO 4 nanorods showed a orange prominent emission peak from magnetic-dipole transition 5D 0 → 7F 1 (593 nm) of Eu 3+ ions whose sites in the EuPO 4 and LaPO 4:Eu nanorods have C 1 symmetry. Compared with bulk LaPO 4:Eu, the fine structure of the Eu-O charge transfer band has very small red shift resulting from the slight increase of the length of Eu-O bond due to nanoscale size effect. Copyright © 2010 American Scientific Publishers All rights reserved.


Xu C.,State Key Laboratory of Rare Earth Resource Utilization | Xu C.,University of Chinese Academy of Sciences | Zhao C.,State Key Laboratory of Rare Earth Resource Utilization | Zhao C.,University of Chinese Academy of Sciences | And 2 more authors.
Chemical Communications | Year: 2011

Here we report that a cytosine-rich DNA carrier, that oscillates between a hairpin and an i-motif structure in its response to pH variation, can be used as a drug binding and release device. © 2011 The Royal Society of Chemistry.


Cheng Z.,State Key Laboratory of Rare Earth Resource Utilization | Xing R.,State Key Laboratory of Polymer Physics and Chemistry | Hou Z.,State Key Laboratory of Rare Earth Resource Utilization | Huang S.,State Key Laboratory of Rare Earth Resource Utilization | Lin J.,State Key Laboratory of Rare Earth Resource Utilization
Journal of Physical Chemistry C | Year: 2010

Printed electronics is expected to be used for fabricating the next-generation displays. However, this technique is still in the laboratory scale and mainly limited to organic luminescent materials and inorganic quantum dots. In this article, a new attempt was made by combining the Pechini-type sol-gel process and inkjet printing for patterning an inorganic YVO 4:Eu3+ thin film phosphor. The mixed solution of metal salts precursors, citric acid, and poly(ethylene glycol) was directly used as ink to deposit patterns on ITO-coated glass substrate. After calcination at 600°C in air, the YVO4:Eu3+ patterns in micrometer-scale were formed on the substrates, and the photoluminescence (PL) and cathodoluminescence (CL) spectra were employed to characterize the obtained samples. A dominating red emission coming from 5D0- 7F2 transition of Eu3+ was observed under excitation of UV light or electronic beam. These results demonstrate that the Pechini-type sol-gel process has good compatibility with the inkjet printing technique and has the potential to be used for fabricating the next-generation Field Emission Display (FED) devices. © 2010 American Chemical Society.


Ren H.,Changchun Institute of Technology | Yang H.,Changchun Institute of Technology | Sun D.,Changchun Institute of Technology | Cui Z.,Changchun Institute of Technology | Hong G.,State Key laboratory of Rare Earth Resource Utilization
Applied Mechanics and Materials | Year: 2012

Rare earth europium (Eu(III))-pyromellitic acid (H 4L)-1,10- phenanthroline (phen) ternary luminescent complex has been synthesized in polyvinylpyrrolidone (PVP) matrix by precipitation method. The chemical constitution of the complex has been demonstrated as PVP/EuL 4/3L(phen)·2H 2O by a combination of elemental analysis, inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and Fourier-transform infrared spectroscopy (FT-IR). X-ray diffraction analysis (XRD) has shown that the complex is a new kind of crystal whose structure is totally different from two ligands. The morphology of the complex has been investigated by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results have shown that the complex has a rodlike crystal structure and the diameter of the rod is about 400 nm. Thermogravimetric analysis (TG) has indicated that the luminescent complex is thermally stable below 300 °C. Photoluminescence spectra (PL) have revealed that the complex can emit Eu 3+ characteristic red fluorescence under ultraviolet excitation.


Song Y.,State Key Laboratory of Rare Earth Resource Utilization | Song Y.,University of Chinese Academy of Sciences | Wei W.,State Key Laboratory of Rare Earth Resource Utilization | Qu X.,State Key Laboratory of Rare Earth Resource Utilization
Advanced Materials | Year: 2011

In recent years, colorimetric biosensing has attracted much attention because of its low cost, simplicity, and practicality. Since color changes can be read out by the naked eye, colorimetric biosensing does not require expensive or sophisticated instrumentation and may be applied to field analysis and point-of-care diagnosis. For transformation of the detection events into color changes, a number of smart materials have been developed, including gold nanoparticles, magnetic nanoparticles, cerium oxide nanoparticles, carbon nanotubes, graphene oxide, and conjugated polymers. Here, we focus on recent developments in colorimetric biosensing using these smart materials. Along with introducing the mechanisms of color changes based on different smart materials, we concentrate on the design of biosensing assays and their potential applications in biomedical diagnosis and environmental monitoring. For transformation of the detection events into color changes, a number of smart materials have been developed, including gold nanoparticles, magnetic nanoparticles, cerium oxide nanoparticles, carbon nanotubes, graphene oxide, and conjugated polymers. Recent developments in colorimetric biosensing using these smart materials and their applications in biomedical diagnosis and environmental monitoring are discussed. Copyright © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Ren H.,Changchun Institute of Technology | Sun D.,Changchun Institute of Technology | Cui Z.,Changchun Institute of Technology | Yang M.,State Key Laboratory of Rare Earth Resource Utilization | Hong G.,State Key Laboratory of Rare Earth Resource Utilization
Journal of Rare Earths | Year: 2010

The terbium(III)-pyromellitic acid(H4L)-1,10- phenanthroline(phen) luminescent complex was synthesized using a co-precipitation method. The chemical composition of the synthesized complex was speculated to be Tb4L3(phen) 0.075·10H2O by elemental analysis, inductively coupled plasma-atomic emission spectroscopy (ICP-AES), and Fourier-transform infrared spectroscopy (FT-IR). The X-ray diffraction analytic results indicated that the synthesized complex is a new crystalline complex, whose structure was different from those of other two ligands. The scanning electron microscopy analytic results showed that the product was of spherical crystals with good dispersion property, and the mean diameter of the spheres was about 1-2 μm. The TG-DTA result showed that the complex had good stability below 489 °C. PL spectra showed that the complex emitted characteristic green fluorescence of Tb(III) ion under ultraviolet excitation. © 2010 The Chinese Society of Rare Earths.


Cui Z.,Changchun Institute of Technology | Ren H.,Changchun Institute of Technology | Sun D.,Changchun Institute of Technology | Yang M.,State Key Laboratory of Rare Earth Resource Utilization | Hong G.,State Key Laboratory of Rare Earth Resource Utilization
Journal of Nanoscience and Nanotechnology | Year: 2011

The luminescent complex terbium (III)-trimesic acid (TMA)-1,10- phenanthroline (phen) nanorod was synthesized in the polyvinylpyrrolidone (PVP) matrix by a co-precipitation method. The chemical formula of the synthesized complex was speculated to be PVP/TbL(phen) 0.5 .7H 2O by inductively coupled plasma-atomic emission spectroscopy (ICP-AES), elemental analysis and Fourier-transform infrared spectroscopy (FTIR). The X-ray diffraction pattern (XRD) of PVP/TbL(phen) 0.5 .7H 2O indicated that it was a crystalline complex. The transmission electron microscopy (TEM) result showed that the complex was nanorods with diameters of about 80-100 nm. The thermogravimetric curve (TGA) analysis exhibited that the complex has good stability below 400 °C. UV-Vis diffuse reflectance spectra showed that there is a maximum absorption at 300 nm. The photoluminescence analyses (PLA) showed that the synthesized complex emitted the characteristic green fluorescence of Tb (III) ions under ultraviolet light excitation. The emission peaks of PVP/TbL(phen) 0.5 .7H 2O at 488, 542, 581, and 618 nm using 278 nm as exciting wavelength can be assigned to the 5D 4→ 7F 6, 5D 4 → 7F 5, 5D 4 → 7F 4, and 5D 4 → 7F 3 electron transitions of the Tb 3+ ions, respectively. © 2011 American Scientific Publishers. All rights reserved.


Ju E.,State Key Laboratory of Rare Earth Resource Utilization | Ju E.,University of Chinese Academy of Sciences | Li Z.,State Key Laboratory of Rare Earth Resource Utilization | Li Z.,University of Chinese Academy of Sciences | And 6 more authors.
Chemical Communications | Year: 2013

We demonstrate for the first time that PPy-SiO2-GTA composites can be used as efficient photothermal agents for killing pathogenic bacteria under NIR irradiation. The cell growth of both gram-positive and gram-negative bacteria targeted by PPy-SiO2-GTA composites could be inhibited effectively after photothermal treatment. © 2013 The Royal Society of Chemistry.


PubMed | State Key Laboratory of Rare Earth Resource Utilization
Type: Journal Article | Journal: Advanced materials (Deerfield Beach, Fla.) | Year: 2011

In recent years, colorimetric biosensing has attracted much attention because of its low cost, simplicity, and practicality. Since color changes can be read out by the naked eye, colorimetric biosensing does not require expensive or sophisticated instrumentation and may be applied to field analysis and point-of-care diagnosis. For transformation of the detection events into color changes, a number of smart materials have been developed, including gold nanoparticles, magnetic nanoparticles, cerium oxide nanoparticles, carbon nanotubes, graphene oxide, and conjugated polymers. Here, we focus on recent developments in colorimetric biosensing using these smart materials. Along with introducing the mechanisms of color changes based on different smart materials, we concentrate on the design of biosensing assays and their potential applications in biomedical diagnosis and environmental monitoring.

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