摘要 :
A novel π-conjugated polymer comprised of 8-methoxyquinoline and benzene groups has been successfully synthesized and characterized. The polymer exhibits good photo and thermal stabilities with decomposition temperature (Td) of 2...
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A novel π-conjugated polymer comprised of 8-methoxyquinoline and benzene groups has been successfully synthesized and characterized. The polymer exhibits good photo and thermal stabilities with decomposition temperature (Td) of 240℃ and glass transition temperature (Tg) of 325℃. The maximum absorption and emission wavelengths of the polymer are 325 nm and 430 nm with a high fluorescence quantum yield (0.74) in chloroform, respectively. The electrochemical properties of the polymer were investigated with the cyclic voltammetry method, and the results agreed with the data of theoretical calculation by the Gaussian 09 software. Based on the excellent photoelectric properties, the polymer as a fluorescent probe was used to detect metal ions in solution and biological cells. Experimental results indicate that the polymer has a high selectivity and sensitivity for Fe~(3+) with the fluorescence quenched processes. Noticeably, the detection of the polymer for Fe~(3+) can be processed in biological system.
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摘要 :
ZnO thin films with highly c-axis orientation have been fabricated on p-type Si(111) substrates at 400℃ by pulsed laser deposition (PLD) from a metallic Zn target with oxygen pressures between 0.1 and 0.7 mbar. Experimental resul...
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ZnO thin films with highly c-axis orientation have been fabricated on p-type Si(111) substrates at 400℃ by pulsed laser deposition (PLD) from a metallic Zn target with oxygen pressures between 0.1 and 0.7 mbar. Experimental results indicate that the films deposited at 0.3 and 0.5 mbar have better crystalline and optical quality and flatter surfaces than the films prepared at other pressures. The full width at half maximum (FWHM) of (0002) diffraction peak decreases remarkably from 0.46 to 0.19° with increasing annealing temperature for the film prepared at 0.3 mbar. In photoluminescence (PL) spectra at room temperature, the annealed film at 700℃ exhibits a smaller ultraviolet (UV) peak FWHM of 108 meV than the as-grown film (119 meV). However, an enhanced deep-level emission is observed. Possible origins to above results are discussed.
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摘要 :
Structure and ultraviolet emission characteristics of amorphous ZnO films grown on indium tin oxide coated glass substrates by electrophoretic deposition were investigated using Raman spectra and photoluminescence. The Raman spect...
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Structure and ultraviolet emission characteristics of amorphous ZnO films grown on indium tin oxide coated glass substrates by electrophoretic deposition were investigated using Raman spectra and photoluminescence. The Raman spectrum shows a unique resonant multiphonon process within amorphous ZnO films. The photoluminescence spectrum of amorphous ZnO films shows a strong ultraviolet emission while the visible emission is nearly fully quenched. The transmission electron microscopy, x-ray diffraction, x-ray photoelectron spectrum, and infrared spectrum are used to detect the structure of amorphous ZnO powder. The complex water plays an important role in the photoluminescence intensity emission.
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摘要 :
Complex three dimensional (3D) a-MnS flowerlike hierarchical architectures with 1-2 mm in diameter built up of ultrathin nanosheets, with ～ 600 nm in length, 150-300 nm in width, and about 10-20 nm in thickness, have been synthes...
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Complex three dimensional (3D) a-MnS flowerlike hierarchical architectures with 1-2 mm in diameter built up of ultrathin nanosheets, with ～ 600 nm in length, 150-300 nm in width, and about 10-20 nm in thickness, have been synthesized firstly by a simple hydrothermal method free from templates or matrixes and organic additives. Adjacent flowerlike architectures can further expand and eventually self-assemble themselves into interconnected porous continuous networks. Selected area electron diffraction (SEAD) pattern and high resolution transmission electron microscope (HRTEM) image indicate that the nanosheet is a well-developed single crystal. Studies show that the formation of complexes in the reaction system is vital to the morphology of the final product. A clear perspective is shown here that more complex nanostructured materials could be chemically synthesized.
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