electrochemical synthesis of dispersed metallic nanoparticles

... Additional file 1) Synthesis of AuNPs To illustrate the effects of CO gas flow injection rates on nanoparticle synthesis, nanoparticles were synthesized from an aqueous solution of HAuCl acid at ... monodispersed nanoparticles of a particular size from a given K2CO3 and HAuCl4 concentration Exploiting the control of [AuClx(OH)4-x]- species development, by addition of K2CO3 and aging of the ... Effect of CO flow rate on nanoparticle spectral profile Normalized UV-visible spectra of nanoparticles synthesized from a chloroauric acid concentration of 0.03 mM aerated at flow rates of 16.9,...

Ngày tải lên: 21/06/2014, 03:20

... structures of these nanocrystals Typical HR-TEM image of Fe2O nanocrystals with diameters of approximately nm presents a crystal lattice of approximately 0.25 nm, corresponding to (110) planes of a-Fe ... /SWNTs as a model case for superior anode materials of lithium ion batteries Figure displays the high reversibility of the electrochemical reactions of Fe2 O3/SWNTs nanohybrid over many charge-discharge ... efficiency of Fe2O3/SWNTs nanohybrids with a current density of 150 mA g-1 Page of Zhao et al Nanoscale Research Letters 2011, 6:71 http://www.nanoscalereslett.com/content/6/1/71 Page of Figure...

Ngày tải lên: 21/06/2014, 06:20

... resulting morphology of metal nanoparticles, because K? does not adsorb on metal nuclei to influence the morphology in the synthesis of metal nanoparticles [30] Synthesis of Pd nanoparticles from ... the case of Pd nanoparticles reveals the anisotropic shape of Pd nanoparticles with preferential orientation of {111} facet 123 184 Nanoscale Res Lett (2009) 4:181–186 Fig TEM image of intermediate ... reduction of Pd by oxalate occurs so rapidly and of UV irradiation is sufficient for the complete reduction of PdCl2 (20 mL of mM) to Pd nanoparticles High reducing ability and photosensitivity of oxalate...

Ngày tải lên: 22/06/2014, 01:20

... of XRD patterns, crystalline of synthesized nanoparticles was improved Figure shows XRD patterns of synthesized powders using conventional heating In the XRD pattern of the powders after heating ... of materials because of the microwave energy transfers to the thermal energy by collision between rotating materials Therefore, the generation of localized high temperatures in the presence of ... order to confirm thermal properties of as prepared samples, TG was used to investigate weight loss of as prepared samples Figure shows the TG curve of MnZnFe2O4 nanoparticles prepared at and 20...

Ngày tải lên: 22/06/2014, 22:20

... reported the formation of Ni-Ag core-shell nanoparticles by first generating Ni nanoparticles through the reduction of Ni2+ with N2H4 and followed by coating of the as-prepared Ni nanoparticles with ... the Colloidal Co Nanoparticles Optimization of process parameters for the fabrication of colloidal Co nanoparticles was done by investigating the effects of the molar ratio of N2H4 to Co2+ (R) ... precipitation of large nanoparticles was observed This phenomenon is attributed to the immediate supersaturation of the solution with Co atoms and the very fast growth rate of the nanoparticles. 10 Thus, synthesis...

Ngày tải lên: 07/08/2014, 14:20

... Journal of Science, Mathematics - Physics 25 (2009) 221-230 In this paper, we report on synthesis and characterization of gold NPs as well as CoPt and FePt NPs Experimental Synthesis of gold ... consists of the following steps [14]: Functionalizing gold nanoparticles with 4-ATP (C6H7NS) Different volumes of 4-ATP mM were added into 20 ml of the gold NPs containing solution The colors of the ... kept at room temperature (RT) Step 2: Growth of nanorods: ml of 0.2 M CTAB solution was added to ml of mM chlorauric acid solution Then a few hundred μl of mM silver acetate (AgC2H3O2) solution was...

Ngày tải lên: 28/03/2014, 13:20

... 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 is ± 1.5 nm It is noted that the Au nanoparticles ... well dispersed on the surface of the SiNWs without any aggregation The SAED pattern Fig (a) Low magnification TEM image of SiNWs; (b) TEM image of a single particle-linked wire; (c) TEM image of ... (1120 °C) will lead to a large amount of carbon nanoparticles having high chemical activity The growth of SiNWs may start from the reaction of the active carbon nanoparticles with the native oxide...

Ngày tải lên: 16/03/2014, 15:06

... high carbon content is due to the existence of carbon nanoparticles on the surface of nanowires The existence of carbon nanoparticles on the surface of nanowires is also identified by Raman measurement ... carbon nanoparticles have been synthesized using thermal decomposition of ethanol The existence of carbon nanoparticles induced strong carbon-related bands in Raman spectrum The enhancement of blue ... result of SEM observation, smooth surface was observed from TEM image of the nanowires synthesized under the condition-2 Meanwile, a lot of hemispheric depositions were found on the surface of the...

Ngày tải lên: 16/03/2014, 15:08

... image of nPt c,d) Conversion rates at À0.8 V of c) NAD+ to NADH in the absence and presence of nPt and d) nPt to nPt-Hads in the absence and presence of NAD+ The rates (= Di/nFA; n = number of electrons, ... Also, the rate of nPt reduction on electrodes increased 25 % in the presence of NAD+ when compared with that in the absence of NAD+ (rate difference = 7.64 nmol sÀ1 cmÀ2) The amount of NADH was ... oxidoreductase, for the synthesis of l-glutamate from a-ketoglutarate in preliminary experiments To confirm the nanoparticulate contribution of nPt to the generation of NADH, various flat and...

Ngày tải lên: 03/05/2014, 17:44

... 4.2.2 Synthesis of Semiconductor Nanoparticles in Liquid Crystals 4.2.3 Synthesis of Magnetic Nanoparticles in Liquid Crystals 4.2.4 Synthesis of Miscellaneous Nanoparticles ... Synthesis in Mono- and Multilayers 4.3.1 Synthesis of Metallic Nanoparticles in Monoand Multilayers 4.3.2 Synthesis of Semiconductor Nanoparticles in Mono- and Multilayers 4.3.3 Synthesis ... Micelles 4.5.1 Synthesis of Metal Nanoparticles in Reversed Micelles 4.5.2 Synthesis of Semiconductor Nanoparticles in Reversed Micelles 4.5.3 Synthesis of Magnetic Nanoparticles in...

Ngày tải lên: 04/06/2014, 15:18

... light of orange color on the whole (Figure 3B) It is noted that the as-prepared nanoparticles are cubic phase, whose fluorescence efficiency is at least one-order of magnitude less than that of ... spectrum (Figure 5) was obtained after ultrasonic dispersion of a wt.% solution of the products in nhexane, compared with the spectrum of nanoparticles before annealing, its green emission plays ... upconversion-luminescent nanoparticles Angew Chem Int Ed 2005, 44:6054-6057 Zeng JH, Su J, Li ZH, Yan RX, Li YD: Synthesis and upconversion luminescence of hexagonal-phase NaYF4:Yb, Er3+ phosphors of controlled...

Ngày tải lên: 20/06/2014, 22:20

... Synthesis and characterization of nanocrystals of barium titanate, toward a generalized synthesis of oxide nanoparticles J Am Chem Soc 2001, 123:12085-12086 Urban JJ, Yun WS, Gu Q, Park HK: Synthesis ... of 7-nm BaTiO3 nanoparticles agree well with early references which have been measured using Page of 110 200 186 169 40 50 2Theta / o o 715 -190 C 60 o 115 -100 C 70 Figure The XRD profiles of ... ultrafine tetragonal BaTiO nanoparticles is synthesiezd in our system The synthesis mechanism of BaTiO3 nanoparticles is believed to undergo two steps [24], hydrolysis of alkoxide to form titanium...

Ngày tải lên: 21/06/2014, 01:20

... http://www.nanoscalereslett.com/content/6/1/399 Page of Figure Optical performance of CdTe cores and corresponding CdTe/CdSe type II QDs by means of microwave-assisted synthesis The optical performance of a series of original CdTe ... allow us to probe the degree of wavelength overlap of the carriers, or the oscillator strength of the transition Figure 2b shows a PL decay of a CdTe/CdSe QD sample dispersed in water The CdTe/CdSe ... intensity This improvement of the photostability of CdTe/CdSe QDs was probably due to the protection of the shell to prevent the oxidization of Te2- on the surface of CdTe QDs, thus retained...

Ngày tải lên: 21/06/2014, 03:20

... IMS of low-solubilitymetal-salt-NPs (i.e metal sulphide NPs) and nanocomposites on their base This communication reports the use of IMS of CuS and PbS INPs along with characterization of the electrochemical ... the charge of the same sign as that of the functional groups of the polymer (e.g S 2- ) is used instead of a ionic reducing reagent (BH4-) As it is seen in Figure 2, the distribution of PbS-NPs ... in this case is the coincidence of the charge sign of ionic reagent with that of the functional groups of the hosting polymer Figure 3a, b, c shows SEM images of a SPEEK-CuSPSNPs nanocomposite...

Ngày tải lên: 21/06/2014, 04:20

... curves of SAC composites are typical of ferromagnetic nanoparticles The nature of the M–H curve in WAC is indicative of the presence of an antiferromagnetic component The antiferromagnetic nature of ... properties with a view to optimize the method of synthesis by cycling to increase the net magnetization of the nanocomposite The exact determination of the amount of nickel on the composite is also important ... diffraction patterns of the SAC and WAC nanocomposites are shown in Figs and The patterns are characteristic of an fcc lattice consisting of nickel nanoparticles without any detectable traces of any impurity...

Ngày tải lên: 21/06/2014, 18:20

... formed nanoparticles The size of CdS nanoparticles biosynthesized by living immobilized R sphaeroides could vary with the culture time The way of the size-controlled biosynthesis of CdS nanoparticles ... sphaeroides cells Size-Controlled Biosynthesis of CdS Nanoparticles The growing phase of cells was found to be an important factor in modulating the morphology of CdS nanoparticles because they evidently ... CdS nanoparticles are composed of the elements Cd and S, and the ratio of Cd:S is 0.97:1.00, being in with the expected value A representative HRTEM image at low amplificatory times of the CdS nanoparticles...

Ngày tải lên: 22/06/2014, 00:20

... spectroscopy of the NE sample further confirm the absence of the template and the presence of the organic groups The sample has a typeIV isotherm with a BET surface area of 815 m2 g-1 and pore volume of ... h under the formation of a white solid The solid particles were centrifuged off The template was extracted by stirring the solid in a mixture of 100 g of acetone and 10 g of M HCl The extracted ... mixture of 0.76 mmol 1: x (x = 51 mmol NaCl: 0.11 mmol P123: 33.6 mmol HCl: 310 mmol H2O) was used The PMO NFs have a diameter of *100 nm The length of as-synthesized NFs extends to tens of lm...

Ngày tải lên: 22/06/2014, 00:20

... diffraction pattern of Pt nanoparticles (NPs) immobilized on N-doped carbon nanotubes (CNTs) and undoped ones To understand the bonding of Pt NPs on N-doped and undoped CNTs, the surface scan of XPS spectrum ... are quite important in the enhancement of electrical properties of NTs and dispersion of Pt NPs on N-doped CNTs Figure shows the cross-sectional FESEM images of Pt NPs on N-doped and undoped CNTs ... on the sidewalls of CNTs incorporated with N Moreover, the particle-size distribution of Pt NPs dispersed on N-doped CNTs is performed in Fig 5c Clearly, the particle diameter of Pt NPs ranges...

Ngày tải lên: 22/06/2014, 00:20

... orientation of the collective CuInSe2 nanoparticles To understand the influence of reaction time on the size of CuInSe2 nanoparticles, several experiments were carried out on the basis of time variable, ... method, it 123 concentration of starting materials decreased to that of half (c) and one-third (d) of the typical synthesis Absorbance (a.u.) Fig SEM images of CuInSe2 nanoparticles synthesized ... influence of temperature on the size of CuInSe2 nanoparticles with a fixed reaction time of 24 h was also studied When the temperature was reduced to 180 °C, the products mainly composed of small...

Ngày tải lên: 22/06/2014, 00:20

... shell by the hydrolysis of TEOS, which enabled the resulting nanoparticles to be dispersed in aqueous solution Herein, the synthesis procedure and the characterizations of the final multifunctional ... pattern of the FS6 nanoparticles 123 498 diffraction angle in Fig 1, corresponds to the amorphous SiO2 shell Figure shows the representative TEM images of iron oxide nanoparticles and FS6 nanoparticles ... the existence of Rhodamine 6G in the FS6 nanoparticles Figure gives the FT-IR spectra of neat Rhodamine 6G, silica-coated magnetic particles (denoted as FS nanoparticles) , and FS6 nanoparticles...

Ngày tải lên: 22/06/2014, 01:20