Control of Gold Nanostructure Morphology by Variation of Temperature and Reagent Ratios in the Turkevich Reaction

2015 ◽  
Vol 68 (6) ◽  
pp. 858 ◽  
Author(s):  
Vivek Poonthiyil ◽  
Vladimir B. Golovko ◽  
Antony J. Fairbanks
Keyword(s):  
Low Temperatures ◽  
Reagent Ratio ◽  
Visible Absorption ◽  
Molar Ratios ◽  
Transmission Electron ◽  
Gold Nanostructure ◽  
Uv Visible ◽  
Spherical Gold Nanoparticles ◽  
First Time ◽  
Visible Absorption Spectroscopy

In this paper, we demonstrate that the Turkevich reaction can be used to obtain not only spherical gold nanoparticles of various sizes, but also nanoparticles of different morphologies. The effect of the molar ratios of citrate to HAuCl4 at various temperatures has been studied. It was found that the reagent ratio plays a significant role in defining the morphology of the gold nanosystems formed at low temperatures. This study shows that by controlling the reagent ratios and the reaction temperature of the Turkevich reaction, nano-structured gold systems with various shapes, including spheres, wires, networks, and systems comprising polygonal nanoparticles only or nanochains only, with the latter two morphologies reported for the first time, can be obtained. The gold nanosystems obtained in this fashion were characterised by 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.

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).

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 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 of Fluorescent Magnetic and Plasmonic-Hybrid Multifunctional Nanopaticles

2014 ◽  
Vol 1081 ◽  
pp. 161-164
Author(s):  
Xue Mei Li ◽  
Zheng Guan ◽  
Hong Ling Liu ◽  
Jun Hua Wu ◽  
Xian Hong Wang ◽  
...  
Keyword(s):  
Ethylene Glycol ◽  
Zno Nanoparticles ◽  
Poly Ethylene Glycol ◽  
Visible Absorption ◽  
Transmission Electron ◽  
Good Magnetic Property ◽  
Uv Visible ◽  
Poly Ethylene ◽  
Poly Propylene

FeAu/ZnO nanoparticles were successfully synthesized by nanoemulsion process with the use of poly (ethylene glycol)-block-poly (propylene glycol)-block-poly (ethylene glycol) as the surfactant. The characterization of the FeAu/ZnO nanoparticles was performed using X-ray powder diffraction (XRD), transmission electron microscopy (TEM) and UV-visible absorption spectroscopy, showing that the polymer-laced nanoparticles reveal high crystallinity, excellent dispersibility and well defined optical performance. The process of solvent dispersion-collection of FeAu/ZnO nanoparticles indicates that the nanoparticles possess good magnetic property for applications.

Photophysical, NMR studies of encapsulation of 2-cyano-6-hydroxy benzothiazole in p-sulfonatocalix[6]arene and its biological applications

The Analyst ◽  
2021 ◽  
Author(s):  
Ankita Shivaji Jadhav ◽  
Ashvini Ulhas Chaudhari ◽  
Kisan M Kodam ◽  
Dipalee Dileep Malkhede
Keyword(s):  
Steady State ◽  
Fluorescence Spectroscopy ◽  
Aqueous Medium ◽  
Biological Applications ◽  
Nmr Studies ◽  
Visible Absorption ◽  
Steady State Fluorescence ◽  
Uv Visible ◽  
Steady State Fluorescence Spectroscopy ◽  
Visible Absorption Spectroscopy

This work deals with the study of interaction between 2-cyano-6-hydroxy benzothiazole (CHBT) and p-sulfonatocalix[6]arene (SCX6) at different pHs in aqueous medium by UV-visible absorption spectroscopy, and steady-state fluorescence spectroscopy. The...

Noise Analysis and Denoising Research on the UV-Visible Absorption Spectroscopy Water Quality Detection System

2014 ◽  
Vol 51 (4) ◽  
pp. 043002 ◽  
Author(s):  
汤斌 Tang Bin ◽  
魏彪 Wei Biao ◽  
毛本将 Mao Benjiang ◽  
赵敬晓 Zhao Jingxiao ◽  
冯鹏 Feng Peng
Keyword(s):  
Water Quality ◽  
Absorption Spectroscopy ◽  
Detection System ◽  
Noise Analysis ◽  
Visible Absorption ◽  
Quality Detection ◽  
Uv Visible ◽  
Visible Absorption Spectroscopy

scholarly journals Effect of Annealing on the ZnS Nanocrystals Prepared by Chemical Precipitation Method

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Nadana Shanmugam ◽  
Shanmugam Cholan ◽  
Natesan Kannadasan ◽  
Kannadasan Sathishkumar ◽  
G. Viruthagiri
Keyword(s):  
Chemical Precipitation ◽  
Chemical Precipitation Method ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
Visible Absorption ◽  
Atomic Force ◽  
Transmission Electron ◽  
Different Temperatures ◽  
Uv Visible ◽  
Dta Curves

Nanocrystals of ZnS have been synthesized through simple chemical precipitation method using thiourea as sulphur source. The synthesized products were annealed at different temperatures in the range of 200–800∘C. The as-synthesized and annealed samples were characterized by X-ray diffraction (XRD), UV-Visible absorption (UV-Vis), and room temperature photoluminescence (PL) measurements. The morphological features of ZnS annealed at 200 and 500∘C were studied by atomic force microscope (AFM) and transmission electron microscope (TEM) techniques. The phase transformation of ZnS and formation of ZnO were confirmed by thermogravimetric (TG) and differential thermal analysis (DTA) curves.

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