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Zhao J.,University of Science and Technology Beijing | Yan X.,University of Science and Technology Beijing | Yang Y.,University of Science and Technology Beijing | Huang Y.,University of Science and Technology Beijing | And 2 more authors.
Materials Letters | Year: 2010

In-doped ZnO nanostructures with four different morphologies, which are nanotetrapods, nanocombs, nanowires, and nanodisks, have been synthesized on silicon substrates by a simple thermal evaporation method. The XRD patterns show the In-doped ZnO nanostructures are all with the hexagonal wurtzite structure, and a slight difference in lattice parameters had been detected among the samples with various morphologies. The Raman spectra demonstrate that the vibrational mode of 2LA, which is very weak in undoped ZnO, was strongly enhanced with indium ion doping into ZnO structures. The photoluminescence (PL) measurements indicate that the nanodisks have a relative strong ultraviolet (UV) emission than other three kinds of samples. © 2009 Elsevier B.V. All rights reserved. Source


Shi J.X.,State Key Laboratory for Advanced Metals and Materials | Zhu J.,State Key Laboratory for Advanced Metals and Materials
Materials Science Forum | Year: 2015

FeGa/PZT/FeGa magnetoelectric device was prepared and the ME effect examined. FeGa alloys was made by different processing method. The results showed that the domains and texturing of FeGa had a great impact on both magnetic and ME performance. The permeability and d33 (the differential of magnetostrictive coefficient) of FeGa differed with processing. It was found that FeGa rolled sheets had good toughness, d33 could reach 2.7 ppm/Oe, and magnetic permeability reached 180. H/m. The device made of FeGa rolled sheets also had a large output (18. V/cm Oe) and low bias field (~ 96 Oe). © (2015) Trans Tech Publications, Switzerland. Source


Lin P.,State Key Laboratory for Advanced Metals and Materials | Yan X.,State Key Laboratory for Advanced Metals and Materials | Zhang Z.,State Key Laboratory for Advanced Metals and Materials | Shen Y.,State Key Laboratory for Advanced Metals and Materials | And 4 more authors.
ACS Applied Materials and Interfaces | Year: 2013

Developing tailored micro/nanostructure interfaces is an effective way to make novel optoelectronic devices or enhance their performances. Here we report the fabrication of a PEDOT:PSS/ZnO micro/nanowire-based self-powered UV photosensor. The generation of photocurrent at zero bias is attributed to the separation of photogenerated electron-hole pairs within the built-in electric field at the PEDOT:PSS/ZnO interface upon UV light illumination. Furthermore, the piezotronic effect on the UV photoresponsivity under different strains is investigated, which is due to the modification of energy band diagram at the p-n heterojunction by strain-induced piezoelectric polarization. This study demonstrates a prospective approach to engineering the performance of a photodetector through straining and may offer theoretical supporting in future optoelectronic device fabrication and modification. © 2013 American Chemical Society. Source


Lu L.,State Key Laboratory for Advanced Metals and Materials | Lu L.,University of Science and Technology Beijing | Zhang W.,State Key Laboratory for Advanced Metals and Materials | Wang D.,State Key Laboratory for Advanced Metals and Materials | And 3 more authors.
Materials Letters | Year: 2010

Monodisperse Fe@Ag core-shell nanoparticles with relatively uniform Fe cores and Ag shells have been successfully fabricated by a seed mediated method in a two-step reducing process, and then characterized by electron microscopy techniques (HRTEM, EDX), X-ray diffraction (XRD), UV-vis spectroscopy and magnetometry. The results demonstrate unique optical and magnetic properties for Fe@Ag core-shell nanoparticles. The surface plasmon resonance of Fe@Ag core-shell nanoparticles is red shifted as compared with that of pure colloidal nano-silver, while the plasmon band of Fe@Ag core-shell nanoparticles with thinner Ag shells is shifted to a longer wavelength. Fe@Ag core-shell nanoparticles have a narrow plasmon band and therefore sensitive plasmonic properties. The magnetism of Fe@Ag nanoparticles can be tuned from superparamagnetic to ferromagnetic by modifying the proportion between Fe and Ag contents. The multifunctional Fe@Ag core-shell nanoparticles have potential in optoelectronic, spintronic, and biomedicine applications. © 2011 Elsevier Ltd. All rights reserved. Source


Wang W.,State Key Laboratory for Advanced Metals and Materials | Qi J.,State Key Laboratory for Advanced Metals and Materials | Qin Z.,State Key Laboratory for Advanced Metals and Materials | Wang Q.,State Key Laboratory for Advanced Metals and Materials | And 3 more authors.
Journal of Physical Chemistry C | Year: 2012

The transport properties tuned by gate electron-beam irradiation was investigated for ohmic- and Schotty-contact-type semiconductor optoelectronic devices based on a single zinc oxide (ZnO) nanotetrapod. Measurements of the I-V characteristics and time-dependent current were conducted. The results indicate that, for both ohmic and Schottky contact devices, the electrical transport properties can be readily tuned by electron-beam irradiation at the gate leg of the tetrapod, with favorable repeatability and reversibility. The response for the Schottky-contact-type device was obviously greater than that for the ohmic-contact-type device, and the closer the irradiated position approached the crystal nucleus, the larger the current response became. A probable mechanism is proposed and discussed. The ZnO nanotetrapod could potentially be used as a detector in irradiation environments. © 2012 American Chemical Society. Source

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