dots composed of core shell heterostructures with alloy components

... synthesized by the procedure: the reduction of the appropriate PhCCl3 monomer, with an ultrasonically generated emulsion of Na–K alloy and an ethereal solvent, tetrahydrofuran (THF), reported in detail ... nanometers Most of them are straight and have a smooth surface Fig 3b shows a TEM image of individual curly wire with the average diameter of 400 nm, revealing the typical structure of wire-like ... amorphous nature (inset) Fig 3d,e show TEM images of the core/ shell structure of the SiNWs wrapped Au nanoparticles The average particle size of the wrapped Au nanoparticles in the composite SiNWs...

Ngày tải lên: 16/03/2014, 15:06

... surface of each pure ZW (Figures 4b, c), without deposition of isolated carbon islands by excess carbon pile-up This resulted in the formation of a hybrid ZnWO4/carbon core/ shell structure (inset of ... http://www.nanoscalereslett.com/content/7/1/9 Page of Figure TGA of pure ZW and C-ZW nanorods (By HW Shim et al.) properties of pure ZW nanorods (core parts) without any visible change In particular, ... Representative TEM images of C-ZW nanorods (a, b) Low and high magnifications (c) TEM image of an individual C-ZW nanorod Inset shows the schematic presentation of a ZnWO4/carbon core/ shell- structured...

Ngày tải lên: 20/06/2014, 23:20

... optical properties of core/ shell ferrite nanoparticles Core/ shell ferrite nanoparticles coated with silica are found to enhance the optical properties of the magnetic nanoparticles Core/ shell zinc ferrite ... decreased compared with zinc ferrite nanoparticles coated with silica shell This is attributed to the effect of silica shell, which enhances the optical properties of core/ shell ferrite nanoparticles ... because of solid state reaction of ZnO resulting from small dissociation of ZnFe2O4 core at high temperature (800°C) with SiO2 shell forming Zn2SiO4 phase Figure shows the TEM images of zinc...

Ngày tải lên: 21/06/2014, 01:20

... close inspection to the core- shell particles reveals that the core- shell composite particles are of spherical shape with nearly uniform size, although the size of these ZrO2 cores is not very uniform ... and the particle surface seems smooth with a diameter of ca 250 nm and a shell thickness of ca 25 nm An obvious contrast between the core and the shell of the latex particles could be observed ... the core- shell nanocomposites XPS Spectrum Analysis The binding energies of Zr atoms with others from polymers were checked by using XPS spectrum Figure shows the XPS spectra of the core- shell...

Ngày tải lên: 22/06/2014, 01:20

... Polymers of Core- Shell 3.3 124 Morphology of Core- Shell Styrene-Butyl Acrylate Polymers by TEM Figure shows the TEM of the core- shell polymer particles The image shows that polymers consist of spherical ... temperature of the initiator APS to form free radical sulfate ions RESULTS AND DISCUSSION 3.1 Emulsion Polymerization of Core- Shell Styrene-Butyl Acrylate with Varying of Feed Time Synthesis of core- shell ... for the formation of the core styrene and the second is for grafting butyl acrylate to the styrene core to complete the shell (ratio of core- shell to feeding time) The results of the conversion...

Ngày tải lên: 07/08/2014, 14:20

... phase fabrication of hydrogel core- shell materials; 4) Characterization of fabricated core- shell materials 5) Encapsulation of macromolecular biomolecules within fabricated core- shell materials ... fabrication of core- shell materials 2.2.5.2 Hollow LbL Microcapsules Fabrication of hollow LbL microcapsules requires the exact procedures for the fabrication of core- shell LbL microcapsules with the ... Fabrication of Core- Shell Materials 28 3.2.3 Specific Aim – Organic Phase Fabrication of Hydrogel Core- Shell Materials 28 3.2.4 Specific Aim – Characterization of Fabricated Core- Shell Materials...

Ngày tải lên: 11/09/2015, 10:15

... quantum dots: CdTe/CdSe (core/ shell) and CdSe/ZnTe (core/ shell) heterostructures J Am Chem Soc 2003, 125:11466-11467 Balet LP, Ivanov SA, Piryatinski A, Achermann M, Klimov VI: Inverted core/ shell ... d CdSe shell 1nm CdTe core 1nm Figure Band structure alignment (a) Alignment of the conduction and valence band edges for CdTe/CdSe core/ shell type II heterostructures (b) XRD patterns of CdTe ... (c) TEM bright field image of the CdTe core QDs in low magnification, the inset for the HRTEM image of CdTe QD with cubic structure (d) HRTEM image of CdTe/ CdSe core/ shell QD, different contrasts...

Ngày tải lên: 21/06/2014, 03:20

... a shell of ZnS not only can decrease the toxicity of cadmium but also can increase the quantum yield [21], forming a core/ shell or core/ shell/ shell structure with CdTe cores inside and ZnS shells ... CdTe/CdS/ZnS core/ shell/ shell quantum dots 191 synthesized CdS shells on CdTe cores can play as a buffer layer to further epitaxially grow ZnS shells So with this facile method, high quality of CdTe/CdS/ZnS ... Fluorescence spectra of different kinds of core/ shell QDs and S precursor in the second part can form a shell of ZnS on the outside of CdTe/CdS QDs The core/ shell/ shell structure was further confirmed...

Ngày tải lên: 22/06/2014, 00:20

... peripheries of the nanowire, which leads to the coaxial core- shell structure TEM observation of several tens of such nanowires reveal that the diameter of the core and the thickness of the shell are ... di1 rection Since only one set of diffraction spots corresponding to the core can be observed, together with the XPS data, it is inferred that the shell is composed of amorphous silicon oxide In ... 550 and 600 nm, as indicated in Fig 5a Each nanowire consists of a crystalline Si core and an amorphous SiOx shell The core and shell both can make contributions to the luminescence, as mentioned...

Ngày tải lên: 16/03/2014, 15:08

... thickness of the shell, we can obtain various Si -core/ Ge -shell and Ge -core/ Si -shell nanowires For a given core shell nanowire, the composition, N core =ðN core þ N shell Þ, where the N core and N shell ... a core 3043 shell nanowire with a specified radius Rcore 2shell of about ˚ 31 a, where the radius of the core (Rcore ) and the thickness of the shell ðT shell ¼ Rout À Rin Þ are adjustable with ... with a shell shell limitation of ðRcore þ T shell ¼ Rcore 2shell Þ Tables and list the structural features of the core shell nanowires we considered As listed in Tables and 2, 20 core shell nanowires...

Ngày tải lên: 16/03/2014, 15:22

... Techniques 16 2.4 Core- Shell Quantum Dots 20 2.4.1 Motivation for Core- Shell Quantum Dots 20 2.4.2 Types of Core- Shell Quantum Dots 21 2.4.3 Choosing a Shell Material for ... methods for producing II-VI semiconductor quantum dots. 10 2.4 Core- Shell Quantum Dots 2.4.1 Motivation for Core- Shell Quantum Dots Since quantum dots are only a few nanometers in diameter, they ... alignment of different core- shell systems The first and most common core- shell system is type-I in which a higher bandgap semiconductor shell is formed on the core, confining the exciton to the core...

Ngày tải lên: 15/05/2014, 10:25

... and validity of the Chinese mandarin version of the PedsQL 4.0 Generic Core Scales and 3.0 Cancer Module in a group of Chinese children with cancer Methods: The PedsQL 4.0 Genetic Core Scales ... the feasibility of the PedsQL 4.0 Generic Core Scales and 3.0 Cancer Module for Chinese children with cancer Most of the scales showed satisfactory reliability with Cronbach’s α of exceeding 0.70, ... scores (better HRQOL) than children with cancer Moreover, we hypothesized that children with cancer on-treatment would report significant differences in HRQOL compared with those of children with...

Ngày tải lên: 20/06/2014, 15:20

... the nanostructure of the MnO2 layer A highly porous MnO2 layer composed of interconnected nanoflakes is introduced in the present study instead of a dense MnO2 layer composed of closely packed ... formation of MnO2 may be dominant in the hydrothermal process Porous MnO2 films composed of nanoflakes have been reported to be easily produced in a hydrothermal reaction of KMnO4 solution without ... self-assembled MnO2 nanoflakes of pure MnO2 microspheres, these MnO2 nanoflakes grown on CNTs are much smaller in dimension, typically with a thickness of less than nm The formation mechanism of the present...

Ngày tải lên: 20/06/2014, 23:20

... nature of BeO shell, which is composed of many island-shape grains with random orientations to the ZnO core Accordingly, a rather rough edge of the BeO shell is observed Magnified image of region ... suppressed in the core/ shell sample, indicating the BeO capping process significantly reduces the surface states of ZnO core The drastic increase in the NBE emission intensities of ZnO in core/ shell sample ... polycrystalline shell and a rough-textured shell surface are formed Upon the successfully synthesized ZnO/BeO core/ shell nanocable arrays, room temperature PL was measured to compare with that of its...

Ngày tải lên: 21/06/2014, 00:20

... core- shell nanostructures Mn2O3@vinyl-functionalized silica (Figure 2b) show coreshell nanostructures with a core diameter of 25-30 nm and shell thickness of 5-10 nm Cores with diameter of 2530 ... with core diameter of 2530 nm and shell thickness of nm Nanoparticles of Page of a b Amorphous silica shell (111) Mn2O3 Figure TEM and HRTEM image (a) TEM and (b) HRTEM images of Mn2O3@SiO2 core- shell ... discussion TEM image of Mn2O3@SiO2 core- shell nanostructures shows cores with size ranging from 25 to 100 nm with a shell thickness of nm (Figure 1a) The presence of amorphous silica shell was clearly...

Ngày tải lên: 21/06/2014, 05:20

... photoluminescence spectra of the PbSe/CdSe QDs upon the series growth of three monolayers of CdSe shells on the 4.8 nm PbSe cores The thickness of each shell is 0.35 nm A consistent red shift of the peak wavelength ... by surface defects depend on the shell growth Compared with the photoluminescence of one monolayer core/ shell QDs, the photoluminescence of two monolayers core/ shell QDs increased as shown in ... during CdSe shell growth A consistent red shift of the peak wavelength (11, 10, 11 nm) was observed when one to three monolayers of CdSe shells grown on 4.8 nm PbSe cores the thickness of energy...

Ngày tải lên: 21/06/2014, 17:20

... than that of the others In the case of the core/ shell S35 nanoparticles, a better EM match is set up due to the existence of the protective amorphous shells and its particular core/ shell microstructures, ... intrinsically core/ shell LSMO nanoparticles are a consequence of the better EM matching due to the existence of the protective amorphous shells, the ferromagnetic cores, as well as the particular core/ shell ... saturation magnetization of S35 nanoparticles is relatively lower, the special intrinsically core/ shell microstructure of the nanoparticles with amorphous shell and ferromagnetic core is the vital factor...

Ngày tải lên: 21/06/2014, 20:20

... literature in the context of core shell structure formation in solution [3, 11] and the increase is expected from the relation [13]   Vshell Cshell 1=3 Dcore @shell ¼ Dcore þ Vcore Ccore ð1Þ where V ... along with several earlier reports of Au–Pt NP formation in solution [3, 5, 10, 25–27] substantiate that the deposition of a Pt shell on top of an Au core is responsible for the disappearance of ... formation of Au–Pt NP assembly over a larger area, without much long range ordering An average height of 7.4 ± 1.3 nm is obtained for the Au–Pt NPs from the analysis of a number of AFM images of different...

Ngày tải lên: 22/06/2014, 00:20

... Ni-filled Co nanotubes (Ni @ Co nanorods) of length 15 lm and of diameter *150 nm The formation of a core shell nanostructure with Co NT as shell and Ni NW as core is abundantly clear from the TEM ... analysis of these nanorods has been carried out using EDS and is shown in Fig Fig a TEM image of Co NT, b TEM image of Ni NW (inset: ED of Ni NW), c FESEM image of Ni @ Co nanorods, and d TEM image of ... values of Co-based alloy nanowires [15] The enhancement in coercivity at low temperatures is consistent with the monotonic increase of uniaxial anisotropy constant with decreasing temperature, with...

Ngày tải lên: 22/06/2014, 00:20

... several tens of micrometers were coated with a uniform layer of ZnS shell This shell was composed of ZnS nanoparticles with a diameter of ca nm, anchoring on the surface of CdS nanowires without any ... conditions Curves: (1) with CdS@ZnS core- shell nanocomposites, (2) with CdS nanowires, (3) with commercial Anatase TiO2, (4) without any photocatalyst, and (5) with CdS@ZnS core- shell nanocomposites ... of the marked region in Fig 3c, from which we can see the shell is made up of ZnS nanoparticles of *4 nm diameter growing along 123 Fig SEM images (a) of CdS nanowires and (b) of 1D CdS@ZnS core- shell...

Ngày tải lên: 22/06/2014, 01:20