qds synthesis and optical properties

... localized states in the band gap due to impurities.22b In light of these assignments, we suggest that the UV emission of nanorod samples in this work might correspond to the band-toband transition The ... and the intensity of this peak increases relative to that of UV emission as the length of nanorods increases A similar PL pattern with two emission maxima, yet at much lower energies of 2.8 and ... 20 nm (medium), and 130 ( 30 nm (long) The strongest PL emission peaks appear at 3.60 eV (344 nm), 3.56 eV (348 nm), 3.55 eV (349 nm) for short (25 ( nm), medium (75 ( 20 nm), and long (130 (...

Ngày tải lên: 20/03/2014, 13:08

... has been paid to the synthesis and characterization of bimetallic nanoparticles due to their unique catalytic, electronic, optical, structural and thermal properties [1-5] and subsequent technological ... [37] Optical and structural properties of the samples were studied using optical absorption spectroscopy in the UV-Vis range, transmission electron microscopy (TEM), high resolution TEM (HREM), and ... shape of those nanoparticles, optical absorption spectra give a quick and gross idea on their shapes and sizes In this study we used TEM, HREM and HAADF, along with optical absorption spectroscopy...

Ngày tải lên: 04/06/2014, 15:20

... In2O3 successfully Their composition and single-crystalline structures were confirmed using XRD, TEM, and SAED The optical determinations imply that the UV–Visible and PL behaviors of In2O3 nanotube ... and TEM Results and Discussion Figure 1a presents the XRD pattern of the In(OH)3 precursor All of the detectable reflection peaks match well 123 Fig XRD patterns of the precursor In(OH)3 (a) and ... absorbed alcohol and water molecules on the sample powder The second step between 150 and 300 °C shows a *16% weight loss, which is in good agreement with theoretical value and the literature...

Ngày tải lên: 22/06/2014, 00:20

... (Co1-xZnxFe2O4; x = 0, 0.5, and 1) and shelling with silica on the magnetic and optical properties of the ferrite nanoparticles for a variety of magneto -optical nanodevice applications From a synthesis point ... important role on the optical properties enhancement The firing temperatures as well as the crystallite size parameters have great effect on the magnetic and the optical properties of core/shell ... gel matrix: optical and magneto -optical properties J Appl Phys 1999, 85(4):2270-2278 16 Hocini A, Boumaza T, Bouchemat M, Royer F, Jamon D, Rousseau JJ: Birefringence in magneto -optical rib waveguides...

Ngày tải lên: 21/06/2014, 01:20

... pattern can confirm the synthesis of a-Fe2O3–Au and Fe3O4–Au hybrid nanorods Fe3O4–Au and a-Fe2O3–Au hybrid nanorods show the combined magnetic and optical properties, which originate 123 1758 Nanoscale ... structure and size Moreover, c-Fe2O3 also exhibit three peaks between 500 and 700 cm-1, which is different from Fe3O4 [40, 41] The IR analysis combined with TEM images and XRD pattern can confirm the synthesis ... resonance band at around 520 nm [44] The exact absorption varies with nanoparticles morphology and particle surface coating Herein, compared to pure Fe3O4 and aFe2O3 nanorods, both Fe3O4–Au and a-Fe2O3–Au...

Ngày tải lên: 21/06/2014, 07:20

... effects of size and shape of Si-nc on the incorporation of group-III (B and Al), group-IV (C and Ge) and group-V (N and P) impurities Single-doping has been investigated both in spherical and faceted-like ... concentrating not only on the structural properties but also on how doping influences the electronic and optical properties Here, we aim to resume the main outcome of this work and illustrate specific results ... different sites labelled 1, and The lines are guide for the eye The structural, electronic and optical properties of Si nanostructures doped with different numbers of B and P impurities have been...

Ngày tải lên: 16/03/2014, 15:15

Ngày tải lên: 22/03/2014, 11:20

... between the ferromagnetic and paramagnetic states is 27 % and 18% for x = 0.12 and 0.14, respectively Finally, the thermal conductivity (κ) of La(Fe1-xSix)13 (x = 0.12, 0.14 and 0.15) compounds is ... amounts of high purity of La with 99.9%, Fe with 99.99% and Si with 99.999% in purified Ar atmosphere The ingots were sealed into evacuated tubes and the heat treatment for homogenization was carried ... thermopower, electrical resistivity and thermal conductivity were measured by using a Quantum Design PPMS in the temperature range from K to 300 K Results and discussion 10000 The La(Fe1-xSix)13...

Ngày tải lên: 28/03/2014, 13:20

... SEM images, TEM image, HRTEM image and SAED pattern of the sea urchin-like ZnO nanostructures are presented in Fig Fig 2a and b displays the low magnification and high magnification SEM images of ... are assembled by a central nucleus and many needlelike ZnO which grow radially from the nucleus The TEM image in Fig X-ray diffraction pattern (a) and UV–visible optical absorption characteristics ... X-ray diffraction system (SIEMENS D5000) UV–visible optical absorption was measured by UV–visible spectrophotometer (Beijing,TU-1901) Results and discussion Fig 1a shows the XRD pattern of the...

Ngày tải lên: 06/05/2014, 13:23

... structural and optical properties of type-II GaSb/InGaAs quantum dots [QDs] grown on InP (100) substrate by molecular beam epitaxy Rectangular-shaped GaSb QDs were well developed and no nanodash-like ... diameter, and height size distribution of GaSb/ InGaAs QDs on InP (100) substrate, the AFM and STEM measurements were carried out Figure shows the AFM and STEM images of GaSb/In0.53Ga0.47As QDs and ... infrared detectors [QDIP] and quantum-dot field-effect transistors [QD-FET] In this work, we investigated the structural and optical properties of type-II GaSb/InGaAs QDs grown on InP (100) substrate...

Ngày tải lên: 20/06/2014, 20:20

... http://www.nanoscalereslett.com/content/7/1/26 temperatures on the structural properties of the films has been investigated, and the optical properties of the films have also been analyzed Methods Synthesis ZnS films were deposited onto ... value The optical band gap of the film deposited at 100°C was 3.45 eV As the growth temperature increased from 200°C to 350°C, the optical band gap red-shifted from 3.57 to 3.79 eV The band gaps ... manuscript JHA analyzed the properties and helped draft the manuscript KNH and KSH detailed the original idea and modified the first draft of manuscript YGS finalized the manuscript and supervised the...

Ngày tải lên: 20/06/2014, 21:20

... measurements and data analysis, and drafted the manuscript DG and DX made the conception and design of the manuscript ZZ2 carried out the XPS measurements and data analysis JLZ and ZZ1 participated ... nanowires: Optical properties and room-temperature ferromagnetism J Appl Phys 2010, 108:043516 doi:10.1186/1556-276X-6-587 Cite this article as: Zhang et al.: Synthesis and magnetic properties ... measurements and data analysis GY and ZS participated in the data analysis and the interpretation of the results All authors have been involved in revising the manuscript, read and approved the...

Ngày tải lên: 20/06/2014, 22:20

... very sensitive tool for the characterization of acceptor/donor impurities and is helpful in understanding the optical and electrical performances of the materials We focused on the temperature-dependent ... were cleaned in acetone and methanol for 20 and rinsed in de-ionized water for The 1, 3, and wt % SZO (5SZO) NWs are grown in a furnace at 800°C with argon gas of 90 sccm and a working pressure ... structural and (a) (b) optical properties of the nanostructures were investigated by field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), and low temperature...

Ngày tải lên: 20/06/2014, 22:20

... of 355.8 and 93.6 Oe, respectively, for NCs and PSC, saturation magnetizations (Ms) of 125.7 and 162.5 emu/g, respectively, for NCs and PSC, and remnant magnetization (M r ) up to 46.6, and 4.5 ... of published SY and YQ: partly carried out the TEM and HRTEM experiments, as well as drafted the manuscript XL, LS, and HL: conceived of the study, and participated in its design and coordination ... metal, which will make them as promising candidates for advanced magnetic media and investigative studies on novel great magnetoresistive properties Results and discussion Figure 1a shows a typical...

Ngày tải lên: 21/06/2014, 04:20

... was carried out to study the optical properties of the porous SiNWs Figure 6a and b display the PL spectrums of the porous SiNWs with different H2O2 concentrations and etching 123 1826 Nanoscale ... 120, and 180 min, respectively Fig a The decomposition of the PL spectrum of the SiNWs treated with HF and the PL intensity varieties of the elementary bands with b H2O2 concentrations and c ... extract electrons from Si nearby and are deoxidized into Ag again The Si atoms around are oxidized and dissolved, leading to the etching of the silicon surface and the formation of the vertical...

Ngày tải lên: 21/06/2014, 08:20

Ngày tải lên: 21/06/2014, 08:20

... short-tubular structures The roomtemperature and low-temperature magnetic properties of these SNTs were investigated The study of pure c-Fe2O3 SNTs and their magnetic properties is a key issue, not only ... c), and HRTEM (d, e, the scale bar is 10 nm) images of as-prepared c-Fe2O3 SNTs incorporated sulfate ions in the preparing process, corresponding to the one band of the v1 mode and two bands ... and desorption curves of starting materials and as-prepared c-Fe2O3 SNTs at 77 K Fig Magnetic hysteresis loops at T = 300 K and the enlarged partial hysteresis curves for starting materials and...

Ngày tải lên: 21/06/2014, 17:20

... applications for frequency doubling and fast optical gating [11] and behaves as an X-ray detector [12] Electronic and optoelectronic properties of GaSe, GaS, and InSe materials indicate the possibilities ... electrical and optical properties of this compound in thin film formation Since the optimization of device performance requires a well-established knowledge of the electrical and optical properties ... lone-pair states and hence broaden the valence band This will give rise to additional absorption over a wider range of energy leading to band tailing and hence shrinking of the band gap The optical gap...

Ngày tải lên: 21/06/2014, 17:20

... contributions Y-HJ and WSC participated in the sequence alignment and drafted the manuscript K-HK and MP carried out the sample preparation JL and H-SH performed data acquisitions and analysis All ... growth angles ZnO films at (a-1) 0°, (b-1) 15°, and (c-1) 30° growth angles and their enlarged images (a-2, b-2, and c-2) Figure shows the XRD patterns and grain sizes of the ZnO films according to ... angle effect of the films for optical properties The thickness of the ZnO thin films was checked by FE-SEM and was fixed at 100 nm Three growth angles (0°, 15°, and 30°) of the columnar ZnO films...

Ngày tải lên: 21/06/2014, 17:20

... diameter, and height size distribution of GaSb/InGaAs QDs on InP (100) substrate, the AFM and STEM measurements were carried out Figure shows the AFM and STEM images of GaSb/ In0.53Ga0.47 As QDs and ... The height (nm) Figure AFM and STEM images of GaSb/In0.53Ga0.47As QDs and histogram of the height of GaSb/In0.53Ga0.47As QDs (a) The AFM image of GaSb/In0.53Ga0.47As QDs, (b) histogram of the ... investigated the structural and optical properties of self-organized type-II GaSb/InGaAs heterostructure QDs grown on InP (100) using MBE Formation of type-II GaSb/InGaAs heterostructure QDs centered on...

Ngày tải lên: 21/06/2014, 17:20