monolayers of silver nanocrystals
Shape controlling of silver and gold nanocrystals
... b is 100 nm) image of sample A1 (a) and E1 (b) without centrifuge separation and SAED of sample A1(c) Figure 5-3 UV-Vis spectrum of silver nanocrystals The shapes of silver nanocrystals are mediated ... employed in controlling the shapes of nanocrystals in solution growth of silver and gold nanocrystals To produce silver and gold nanoprisms, weak reductants or precursor of reducing agent should be ... SHAPE CONTROLLING OF SILVER AND GOLD NANOCRYSTALS ZHOU XUEDONG A THESIS SUMBITTED FOR THE DEGREE OF DOCTOR OF PHILOSOPHY DEPARTMENT OF CHEMISTRY NATIONAL UNIVERSITY OF SINGAPORE 2008 ACKNOWLEDGE...
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Photocatalytic bactericidal activity of silver-sensitized titanium dioxide on Micrococcus lylae
... complexity of cell wall Silver ion (Ag+) is a bactericidal agent (Pedahzur et al., 1995) The binding of Ag+ and respiratory enzymes initiates changes in permeability of plasma membranes of bacteria ... standard deviation of independent triplicates - 49 - Journal of Water and Environment Technology, Vol.3, No.1, 2005 Effect of Ag content in photocatalysts Bactericidal activities of the three photocatalysts ... number of active sites on TiO2 surface that available for oxidation decreased Moreover, addition of a high dose of TiO2 increased the opacity and decreased light penetration by scattering of photons,...
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A Plasmonic Photocatalyst Consisting of Silver NanoparticlesEmbedded in Titanium Dioxide
... below a wavelength of 340 nm in curve (a) of Figure is associated with the optical band gap of TiO2 In curve (b), a peak indicating the presence of an LSP for the sample made of TiO2 on Ag NPs ... eventually a 10 nm thick layer of silver oxide (AgO) at room temperature Such values were already measured employing time -of- flight secondary ion mass spectroscopy (TOF-SIMS).16 The result strongly ... photocatalysis The idea of plasmonic photocatalysis is as follows TiO2 of anatase phase is a semiconductor with a band gap of 3.26 eV,12 so near UV irradiation can excite pairs of electrons and holes...
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rhombohedral shape of hematite nanocrystals synthesized via thermolysis
... interacts with every point of the AFM tip, finally leading to a profile of the tip instead of a profile of the HNP itself The green line shown in Figure 5a is an emulation of the pathway followed ... The technique of the deposition of particles by means of a drop of diluted solution on cleaved MoS2 was perfectly successful regarding the goal of the experiment A good dispersion of the particles ... cross profile of image in (b) Roman italic numbers I-II indicate the orientation of cross sections Figure (a) Illustration of the tip scanning over the particle At the left side, the same part of...
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ultrafast spectroscopy of cdse nanocrystals morphological and environmental effects on nonradiative and nonadiabatic relaxation
... concentrations of 5.0 mg/mL of CdSe to toluene solvent Next, it was dipped into a mixture of 30 μL of hydrazine hydrate in 10 mL of deionized water Finally, it was dipped into 15 mL of acetonitrile ... fact chosen to match the band edge energies of the QR samples For example, the peak of the 1S transitions of QD1 is comparable in wavelength to that of QR1, approximately 600 nm, and similarly ... acoustic eigenmodes of the NC, resulting in a superposition of LA and TA modes.27 Here, instead of a glassy dielectric matrix that encases individual dots, we have a porous system of NCs that act...
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ultrafast spectroscopy of cdse nanocrystals morphological and environmental effects on nonradiative and nonadiabatic relaxation
... concentrations of 5.0 mg/mL of CdSe to toluene solvent Next, it was dipped into a mixture of 30 μL of hydrazine hydrate in 10 mL of deionized water Finally, it was dipped into 15 mL of acetonitrile ... fact chosen to match the band edge energies of the QR samples For example, the peak of the 1S transitions of QD1 is comparable in wavelength to that of QR1, approximately 600 nm, and similarly ... acoustic eigenmodes of the NC, resulting in a superposition of LA and TA modes.27 Here, instead of a glassy dielectric matrix that encases individual dots, we have a porous system of NCs that act...
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Báo cáo hóa học: " Effects of silver impurity on the structural, electrical, and optical properties of ZnO nanowires" doc
... performances of the materials We focused on the temperature-dependent PL measurements of various silver- doped ZnO (SZO) NWs to reveal the role of Ag acceptor in the optical properties of the ZnO-based ... structure because of both low Ea and optimized quantity of substitution function of Ag+ [19] However, stress of lattices structure on both 3SZO and 5SZO NWs is very impressive because a lot of Ag interstitials ... because the chemical bonding distance of Ag-O is longer than that of Zn-O [35,36] In the case of 3SZO and 5SZO NWs, the surface of the SZO NWs is crumpled because of the stress by doping effect [37]...
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Báo cáo hóa học: " Optical characterisation of silicon nanocrystals embedded in SiO2/Si3N4 hybrid matrix for third generation photovoltaics" doc
... region of Figure 3; (b) Tauc plot of region I with g = 1/2 The dashed lines are fittings to the quasi-linear parts of the curves; (c) Tauc plot of region III with g = 1; (d) Tauc plot of region ... secondary optics consists of a parallel plate collimator of 0.27° acceptance and a Soller slit of 0.04 rad aperture The measured X-ray results correspond to an average sample area of about 20 × 20 mm2 ... as well as the change of detector/source during measurement However, the influence of these factors on the accuracy of the optical band gap estimation is very small because of the following reasons:...
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Báo cáo hóa học: " Preparation of monolayers of [MnIII6CrIII]3+ singlemolecule magnets on HOPG, mica and silicon surfaces and characterization by means of noncontact AFM" pptx
... http://www.nanoscalereslett.com/content/6/1/486 Page of 10 C N O Cr Mn Figure Molecular structure of [MnIII6CrIII]3+ in crystals of [MnIII6CrIII](BPh4)3 4MeCN 2Et2O [6] the influence of the anions with respect to the ... surface, the use of non-contact (nc)-AFM allows us to observe the molecule with a decreased risk of manipulating the molecule during this process Of special interest are the thin layers of [MnIII6CrIII]3+ ... concentration and amount of solution, or the number of molecules, was sufficient for the creation of approximately one monolayer During preparation the sample was held at an angle of 57° which led to...
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báo cáo hóa học: " Structural and thermal studies of silver nanoparticles and electrical transport study of their thin films" pdf
... copper grid of TEM No peaks of other impurity have been detected Therefore, the EDX profile of sample (inset of Figure 2) indicates that the silver nanoparticles sample contain pure silver, with ... http://www.nanoscalereslett.com/content/6/1/434 Page of A B Figure FETEM and HRTEM images of silver nanoparticles (a) FETEM image of silver nanoparticles (b) High-resolution image of a single silver nanoparticle and inset ... Page of Figure FESEM image of silver nanoparticles and inset shows EDX profile for the same HRTEM images of the same sample are shown in Figure 3a, b, respectively Figure 3a shows that silver...
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Báo cáo hóa học: " Application of silver nanofluid containing oleic acid surfactant in a thermosyphon economizer" pdf
... fluid = pure water, silver nanofluid concentration of 0.5 w/v% and silver nanofluid concentration of 0.5 w/v% mixed oleic acid surfactant The variable parameters Concentration of oleic acid surfactant ... heat of vaporization, (kJ · kg-1) k Thermal conductivity (W/mK) L Length of thermosyphon (mm) Lc Characteristic length (m) • -1 m Mass flow rate (kg · s ) NF Silver nanofluid NF + OA Silver nanofluid ... acid NF + OA 0.5 w/v% Silver nanofluid with oleic acid concentration 0.5 w/v% NF + OA w/v% Silver nanofluid with oleic acid concentration w/v% NF + OA 1.5 w/v% Silver nanofluid with oleic acid...
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Báo cáo hóa học: " Effect of ion implantation energy for the synthesis of Ge nanocrystals in SiN films with HfO2/SiO2 stack tunnel dielectrics for memory application" pot
... ignored because of the absence of discrete charge Sahu et al Nanoscale Research Letters 2011, 6:177 http://www.nanoscalereslett.com/content/6/1/177 Page of Figure C-V characteristics of Ge+-implanted ... the higher conductance band edge of Ge-NCs [30] A significant memory window of 2.36 V has been achieved through a waiting time of 104 s with a possible trend of stabilization indicating charge ... http://www.nanoscalereslett.com/content/6/1/177 Page of well-isolated Ge-NCs with an average size of 3.5 nm were self-assembled within the top Si3N4 layer at a distance of 5.6 nm from SiN/HfO2 interface A significant memory window of 3.95...
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Báo cáo hóa học: " Microscopic study of electrical properties of CrSi2 nanocrystals in silicon" potx
... differences in the vicinity of NCs Across most of the surface, the current was nearly constant and even independent of the polarity of the bias Locally, evidence of rectification could be observed ... (b) SCM image of the same area cross section of the SCM image across a NC is shown in Figure The half-width of the peak agrees with the size of the NCs It shows that the interaction of the charged ... concentrations of Crrelated point defect in the two types of samples indicate that these defects may be related to the observed migration of the NCs during the cap growth To enable us understand the role of...
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Báo cáo hóa học: " Supported quantum clusters of silver as enhanced catalysts for reduction" doc
... products Intact clusters, along with the monolayers, are seen only in MALDI-MS and ESI-MS of the free clusters [34] One of the interesting aspects of silver is its isotope distribution, which ... Page of 250 375 500 625 Wavelength (nm) 750 0.8 0.4 0.0 250 375 500 625 Wavelength (nm) 750 Figure UV-vis spectra of the reduction of 4-np as a function of time with NaBH4 in the presence of supported ... Kinetics plot for the reduction of 4-np (a) Variation of 4-np concentration with time in the presence of excess BH4- (b) A plot of ln (k) versus 1/T for the reduction of 4-np Leelavathi et al Nanoscale...
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Báo cáo hóa học: " On the Morphology, Structure and Field Emission Properties of Silver-Tetracyanoquinodimethane Nanostructures" pptx
... higher rate of diffusion dominates, the nanowires grow seemingly in succession without obvious tips on the surface In addition, the thickness of silver film greatly influences the length of as-obtained ... density of 10 lA/cm2 The cross-sectional area of the anode is 0.498 cm2 defined as the field emission area to obtain the current density Results and Discussion Figure shows the typical top view of the ... provide larger amount of Ag source, which would extend the reaction time in the process of nanowire growth, thus Ag-TCNQ with larger length could form In short, the thickness of the pre-deposited...
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Báo cáo hóa học: " Aqueous-Phase Synthesis of Silver Nanodiscs and Nanorods in Methyl Cellulose Matrix: Photophysical Study and Simulation of UV–Vis Extinction Spectra Using DDA Method" docx
... obtained by using mM of sodium citrate, shows the presence of only silver nanorods of different aspect ratios (R = 3–7) The histogram of particle distribution of corresponding silver nanorods (Fig ... few number of spheres The histogram of nanodiscs distribution (Fig 2b) shows that majority of discs have a diameter of *55 nm On the other hand, HR-TEM photograph of green-coloured silver sol ... nanoparticles, b (i) HR-TEM of red-coloured silver sol and (ii) SAED pattern of the corresponding sol and c (i) HR-TEM of green-coloured silver sol and (ii) SAED pattern of green sol 123 3-3.9 4-4.9...
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Báo cáo hóa học: " Assembly of Silver Nanoparticles into Hollow Spheres Using Eu(III) Compound based on Trifluorothenoyl-Acetone" doc
... SNOM surface image of silver hollow spheres (b) The SNOM transmittance image of silver hollow spheres Fig (a) SEM images of the silver hollow spheres and (b) HRFSEM images of the silver hollow spheres ... HRTEM images of the silver hollow spheres, and (c) ED pattern of the silver hollow spheres produced in template synthesis [17], the size is smaller The shell of dark edges consists of the silver nanoparticles ... the surface plasmon resonant absorption of 123 silver nanoparticles as shown in curve B of Fig 2, suggesting that the silver hollow spheres consisted of silver nanoparticles The surface plasmon...
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Báo cáo hóa học: " Fabrication of Worm-Like Nanorods and Ultrafine Nanospheres of Silver Via Solid-State Photochemical Decomposition" pot
... monodispersed Ag nanorods depends on the use of seed, pH of the medium, rate of the reduction of Ag? ions or rate of generation of Ag atoms, and concentration of CTAB [33] Ascorbic acid is preferred ... ratio of Ag2C2O4 and CTAB), formation of spherical nanoparticles (*30 nm) has been observed This is due to the poor capping ability of CTAB Formation of nanorods in the case of 1:5 ratio of Ag2C2O4 ... the texture coefficient of the facet (hkl), I(hkl) is the intensity of the (hkl) reflection of the sample under analysis, Io(hkl) is the intensity of the (hkl) reflection of a polycrystalline bulk...
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Báo cáo hóa học: "Synthesis of SnS nanocrystals by the solvothermal decomposition of a single source precursor" pdf
... solutions of 0.379 g of SnCl2 and 0.45 g of diethylammonium diethyldithiocarbamate were prepared in ml of anhydrous methanol and purged with argon With continued stirring, a solution of SnCl2 ... energy of the bulk semiconductor The n value is for indirect-gap materials Values of the optical band gap for the samples were obtained by the extrapolation of the linear region of the plot of (ahv)1/2 ... the shape of the SnS NCs seems to be dependent on the nature of the stabilizing agents used in addition to the thermal conditions of the preparation Isotropic and anisotropic growth of SnS NCs...
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Báo cáo hóa học: " Synthesis of SnS nanocrystals by the solvothermal decomposition of a single source precursor" ppt
... solutions of 0.379 g of SnCl2 and 0.45 g of diethylammonium diethyldithiocarbamate were prepared in ml of anhydrous methanol and purged with argon With continued stirring, a solution of SnCl2 ... energy of the bulk semiconductor The n value is for indirect-gap materials Values of the optical band gap for the samples were obtained by the extrapolation of the linear region of the plot of (ahv)1/2 ... the shape of the SnS NCs seems to be dependent on the nature of the stabilizing agents used in addition to the thermal conditions of the preparation Isotropic and anisotropic growth of SnS NCs...
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