Synthesis and Characterizations of Monodispersed Nanotriangle of Gold

2012 ◽  
Vol 455-456 ◽  
pp. 549-552
Author(s):  
Kai Cheng Zhang ◽  
Si Ying Zhao
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Decisive Role ◽  
Direct Reaction ◽  
Visible Absorption ◽  
Gold Particles ◽  
X Ray ◽  
Transmission Electron ◽  
Uv Visible ◽  
Visible Absorption Spectroscopy

Monodispersed nanotriangles of gold have been prepared by a simple reaction between HAuCl4·4H2O, KOH and NH2OH·HCl in the presence of gelatin. Gelatin played a decisive role as an inhibitor of the direct reaction of NH2OH with AuCl4- and coagulation of the growing gold in producing the triangle. In the absence of gelatin, we can only obtain irregular large gold particles. The products were characterized by X-ray powder diffraction, transmission electron microscopy and UV-visible absorption spectroscopy.

Synthesis and Characterizations of Nanocubes, Monodispersed Nanocrystals and Nanospheres of Au

2007 ◽  
Vol 353-358 ◽  
pp. 2163-2166
Author(s):  
Ming Yang ◽  
Guo Qing Zhou ◽  
Jiang Guo Zhao ◽  
Zhan Jun Li
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Powder Diffraction ◽  
Visible Absorption ◽  
X Ray ◽  
Transmission Electron ◽  
Uv Visible ◽  
Scherrer Formula ◽  
Visible Absorption Spectroscopy

Nanocubes, monodispersed nanocrystals and nanospheres of Au have been prepared by a simple reaction between HAuCl4·4H2O, NaOH and NH2OH·HCl in the presence of gelatin. The role of gelatin and the affection of pH in producing the nanoparticles of Au were discussed. The products were characterized by X-ray powder diffraction, transmission electron microscopy, and UV-visible absorption spectroscopy. The sizes of the monodispersed nanocrystals of Au were estimated by Debye-Scherrer formula according to XRD spectrum.

Synthesis and Characterisation of Bicone-Shaped and Monodispersed Nanoparticles of Cu2S

2011 ◽  
Vol 194-196 ◽  
pp. 755-758
Author(s):  
Ming Yang ◽  
Kui Zhou
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Powder Diffraction ◽  
Band Gaps ◽  
Optical Measurements ◽  
Visible Absorption ◽  
X Ray ◽  
Transmission Electron ◽  
Uv Visible ◽  
Visible Absorption Spectroscopy

Bicone-shaped and monodispersed nanoparticles of Cu2S have been prepared by a simple reaction between CuO suspension, NH2OH•HCl and (NH4)2S in the presence of gelatin at 5°C. The products were characterized by X-ray powder diffraction, transmission electron microscopy and UV-visible absorption spectroscopy. The band gaps are estimated to be 1.98 eV and 2.03 eV according to the results of optical measurements of bicone-shaped and monodispersed nanoparticles of Cu2S.

Synthesis and photocatalytic hydrogen evolution of meso-tetrakis(p-sulfonatophenyl)porphyrin functionalized platinum nanocomposites

2010 ◽  
Vol 14 (06) ◽  
pp. 540-546 ◽  
Author(s):  
Lingling Zhang ◽  
Yongtao Lu ◽  
Yukou Du ◽  
Ping Yang ◽  
Xiaomei Wang
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Antenna System ◽  
X Ray Diffraction ◽  
Visible Absorption ◽  
X Ray ◽  
Transmission Electron ◽  
Visible Absorption Spectroscopy

Meso-tetrakis(p-sulfonatophenyl)porphyrin (TPPS4) functionalized platinum nanocomposites were synthesized and characterized using ultraviolet-visible absorption spectroscopy (UV-vis), fluorescence spectroscopy (FL), Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), and X-ray diffraction (XRD) methods. The postulated configuration of TPPS4 functionalized platinum nanocomposite may be described as an antenna system containing a photoreceptive TPPS4 shell and a nanosize platinum core. Fluorescence and photoelectrochemistry studies of both TPPS4 and the platinum nanocomposites showed that efficient electron/energy transfer occurred from the TPPS4 donor to the metallic nanocore acceptor. TPPS4 functionalized platinum nanocomposites are photocatalytic active for water reduction to produce hydrogen. The turnover numbers (TONPt and TONTPPS4) and quantum yield of hydrogen (ϕH2) for the photocatalyst (nPt:nTPPS4= 250) were 44, 11056, and 1.8%, respectively, calculated on the basis of the total amount of H2 evolution for 12 h irradiation.

Photoluminescence profile mapping of Eu(iii) and Tb(III → IV)-embedded in quantum size SnO2 nanoparticles

RSC Advances ◽  
2014 ◽  
Vol 4 (59) ◽  
pp. 31155-31161 ◽  
Author(s):  
Young In Choi ◽  
Youngku Sohn
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Sno2 Nanoparticles ◽  
Spectroscopic Properties ◽  
X Ray Diffraction ◽  
Visible Absorption ◽  
X Ray ◽  
Quantum Size ◽  
Transmission Electron ◽  
Uv Visible

Eu(iii) and Tb(iv) activators were embedded in quantum size SnO2 nanoparticles by a hydrothermal method and their morphologies, crystal structures and spectroscopic properties were examined by transmission electron microscopy, X-ray diffraction crystallography, UV-visible absorption, and 2D/3D-photoluminescence mapping.

Aquatic Fern (AzollaSp.) Assisted Synthesis of Gold Nanoparticles

2016 ◽  
Vol 15 (01n02) ◽  
pp. 1650008 ◽  
Author(s):  
Anal K. Jha ◽  
K. Prasad
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Gold Nanoparticles ◽  
Surface Plasmon Resonance ◽  
Au Nanoparticles ◽  
X Ray ◽  
Aquatic Fern ◽  
Transmission Electron ◽  
Anthraquinone Glycosides ◽  
Uv Visible

Aquatic pteridophyte (Azolla sp.) was taken to assess its potential to synthesize the metal (Au) nanoparticles. The synthesized particles were characterized using X-ray, UV-visible, scanning and transmission electron microscopy analyses. Nanoparticles almost spherical in shape having the sizes of 5–17[Formula: see text]nm are found. UV-visible study revealed the surface plasmon resonance at 538[Formula: see text]nm. Responsible phytochemicals for the transformation were principally phenolics, tannins, anthraquinone glycosides and sugars present abundantly in the plant thereby bestowing it adaptive prodigality. Also, the use of Azolla sp. for the synthesis of gold nanoparticles offers the benefit of eco-friendliness.

Mixed-Solvothermal Preparation of Mace-Like CdS Nanocrystals

2012 ◽  
Vol 502 ◽  
pp. 164-168
Author(s):  
Ling Xu ◽  
Han Mei Hu ◽  
Hai Yan Xu
Keyword(s):  
Electron Microscopy ◽  
Large Scale ◽  
Volume Ratio ◽  
X Ray Diffraction ◽  
Visible Absorption ◽  
X Ray ◽  
Transmission Electron ◽  
Cds Nanostructures ◽  
Uv Visible ◽  
Solvothermal Preparation

Novel mace-like (wolf-teeth clubs) CdS nanostructures were successfully prepared on a large scale using CdCl2•2.5H2O and NH2CSNH2 as starting materials through a convenient mixed-solvothermal route. The as-synthesized products were characterized by X-ray diffraction (XRD), energy dispersive X-ray spectrometry (EDX), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM) and UV-visible absorption spectroscopy. The experimental results reveal that the morphology of CdS products was greatly affected by the volume ratio of anhydrous ethanol and distilled water. The possible mechanism for the formation of mace-like CdS nanostructures is simply discussed.

scholarly journals Synthesis and application of pigments based on lanthanide orthoferrites

2020 ◽  
Vol 14 (2) ◽  
pp. 161-167
Author(s):  
Patrícia Pimentel ◽  
Jairo Dutra ◽  
Maria Câmara ◽  
Gerbeson Dantas ◽  
Osmar Bagnato ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Perovskite Phase ◽  
Visible Region ◽  
Ceramic Pigments ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Uv Visible ◽  
Cie Lab

In this work, we synthesized oxides with perovskite LnFeO3 type structure (where Ln = La, Pr and Nd), aiming their use as ceramic pigments. The as-synthesized powders, prepared by gelatin method, were thermally treated at 600 and 800 ?C to obtain the perovskite phase. The characterization was performed using X-ray diffraction technique, followed by Rietveld refinement, scanning and transmission electron microscopy, spectroscopy in the UV-Visible region and CIE Lab colorimetry. The calcined powders were also used for fabrication of ceramic pieces to evaluate the colour when 2 wt.% of the powders was added into a transparent glaze. The pigments presented shades ranging from pale brown for the powdered samples to yellowish when applied in the glazes.

scholarly journals Synthesis and Characterization of Nanorods in Sucrose Ester Water-in-Oil Microemulsion

2011 ◽  
Vol 2011 ◽  
pp. 1-6
Author(s):  
N. M. Huang
Keyword(s):  
Reaction Time ◽  
Sucrose Ester ◽  
Synthesis And Characterization ◽  
Microemulsion System ◽  
Visible Absorption ◽  
X Ray ◽  
Transmission Electron ◽  
Uv Visible ◽  
Visible Absorption Spectroscopy

We report the synthesis of nanorods in a nonionic sugar-based water-in-oil (w/o) microemulsion system using food grade sucrose ester as biosurfactant. was formed by mixing indium (III) chloride and thioacetamide in the water core of the microemulsion system. The as-prepared yellowish was characterized by X-ray diffractometry (XRD), UV-visible absorption spectroscopy (UV-Vis), transmission electron microscopy (TEM), and Fourier transform infrared spectroscopy (FTIR). Formation of spherical or rod-like nanomaterials was dependent on reaction time. Rod-like , arranged in bundles, was formed only after 2 days of reaction time. Upon longer aging time, a mixture of rod-like and spherical was formed. A plausible formation mechanism of the nanorods in the sucrose ester microemulsion was postulated. The diameter of the nanorods was found to be very small, which is  nm with aspect ratio of 20 : 1 (length : diameter).

Phase Sensitive Behavior and Optical Properties of Cu0.45Mn0.55O2 Nanoparticles

2012 ◽  
Vol 548 ◽  
pp. 110-114 ◽  
Author(s):  
Qurat Ul Ain Javed ◽  
Feng Ping Wang ◽  
M. Yasir Rafique ◽  
M. Zubair Iqbal
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Visible Spectrum ◽  
X Ray ◽  
Selected Area Electron Diffraction ◽  
Transmission Electron ◽  
Detailed Characteristic ◽  
Direct Band ◽  
Phase Sensitive ◽  
Uv Visible

In this work, we have reported a facile approach to fabricate the new Cu0.45Mn0.55O2 nanoparticles with novel properties. The detailed characteristic of the nanoparticles have been performed by X-Ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray (EDX) analysis, transmission electron microscopy (TEM), high resolution transmission electron microscopy (HRTEM), selected area electron diffraction (SAED), and UV-visible spectroscopy. HRTEM and SAED measurements point out that the nanoparticles are phase sensitive during exposure to electron beam irradiation and undergo a reversible transition from single crystal to polycrystalline. UV-visible spectrum indicates the direct band gap of 1.4eV as well as more than 80% transparency in UV region.

Morphology-Controlled Synthesis of Single Crystalline α-Mn2O3 Sea-Urchins Assembled with Pen-Type Nanoneedles and Broad Absorption Spectrum

2015 ◽  
Vol 33 ◽  
pp. 38-48 ◽  
Author(s):  
Qurat Ul Ain Javed ◽  
Hussain Abbas ◽  
Hasan Mahmood ◽  
Abdul Sattar ◽  
Feng Ping Wang ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Sea Urchin ◽  
Sea Urchins ◽  
Experimental Conditions ◽  
Hydrothermal Temperature ◽  
Single Crystalline ◽  
X Ray ◽  
Transmission Electron ◽  
Uv Visible

Single crystalline high quality α-Mn2O3nanorods and sea-urchins assembled with pen-type nanoneedles have been successfully synthesized by template-free hydrothermal route. The variation in hydrothermal temperature has affected the morphology of the α-Mn2O3sea-urchin assembled with the nanoneedles noticeably. The influence of temperature change on the thickness, crystallinity, surface morphology and optical properties of α-Mn2O3has been characterized by X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Energy Dispersive X-ray (EDX) analysis, Transmission Electron Microscopy (TEM), High Resolution Transmission Electron Microscopy (HRTEM), Raman Spectroscopy (RS) and UV-visible Spectroscopy. The results showed that in our experimental conditions, single crystalline nanorods of the α-Mn2O3were obtained at a low temperature of 180 °C, while single crystalline sea-urchin assembled with pen-type nanoneedles were obtained by increasing the temperature to 280 °C. Nanorods and sea-urchin assembled with pen-type nanoneedles obtained had the well defined morphology and crystalline quality. The sea-urchin synthesized at 280 °C exhibited more than 90% absorption in UV-visible spectrum.

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