scholarly journals Controlled Aspect Ratios of Gold Nanorods in Reduction-Limited Conditions

2011 ◽  
Vol 2011 ◽  
pp. 1-7 ◽  
Author(s):  
Jong-Yeob Kim ◽  
Chil Seong Ah ◽  
Du-Jeon Jang
Keyword(s):  
Gold Nanorods ◽  
Silver Ions ◽  
Gold Clusters ◽  
Molar Ratio ◽  
Electrolysis Time ◽  
Electrolytic Solution ◽  
Silver Plate ◽  
Growth Solution ◽  
Seed Solution ◽  
Aspect Ratios

Aspect ratios of gold nanorods have been finely modified in reduction-limited conditions via two electrochemical ways: by changing the amount of a growth solution containing small gold clusters in the presence of already prepared gold nanorods as seeds or by changing electrolysis time in the presence or absence of a silver plate. While the atomic molar ratio of gold in the growth solution to gold in the seed solution is critical in the former method, the relative molar ratio of gold ions to silver ions in the electrolytic solution is important in the latter way for the control of the aspect ratios of gold nanorods. The aspect ratios of gold nanorods decrease with an increase of electrolysis time in the absence of a silver plate, but they increase with an increase of electrolysis time in the presence of a silver plate.

Controlling Length of Gold Nanorods and Monitoring Their Growth Mechanism Using X-ray Absorption Spectroscopy

2006 ◽  
Vol 921 ◽  
Author(s):  
Ru-Shi Liu ◽  
H. M. Chen ◽  
S. F. Hu
Keyword(s):  
Ascorbic Acid ◽  
Fine Structure ◽  
Absorption Spectroscopy ◽  
Growth Mechanism ◽  
Gold Nanorods ◽  
New Approach ◽  
Growth Solution ◽  
X Ray ◽  
Aspect Ratios ◽  
X Ray Absorption

AbstractA new approach to fabricate long length of gold nanorods by controlling the volume of growth solution will be reported. The shape evolutions ranging from fusiform nanoparticles to 1-D rods was observed. Increasing the addition of growth solution can control the length of nanorods. The length of rods can be extended to 2 £gm, and nanorods with aspect ratios of up to ~ 70 could be obtained. Moreover, X-ray absorption spectroscopy (XAS) is applied herein to elucidate the growth mechanism of gold nanorods. The gold ions were directly reduced to gold atoms by ascorbic acid during the reaction, and then gold atoms were deposited on the surface of gold seeds that were introduced into the reaction. Extended X-ray absorption fine structure (EXAFS) confirmed the growth of gold and the environment around Au atoms over the reaction. The XAS are expected to have wide applications in the growth of gold and other related materials.

One-step synthesis of silver nanoplates with high aspect ratios: using coordination of silver ions to enhance lateral growth

RSC Advances ◽  
2016 ◽  
Vol 6 (98) ◽  
pp. 95768-95773 ◽  
Author(s):  
Young Min Park ◽  
Byung Gon Lee ◽  
Jong-Il Weon ◽  
Mun Ho Kim
Keyword(s):  
Silver Ions ◽  
Lateral Growth ◽  
Silver Nanoplates ◽  
Aspect Ratios ◽  
One Step

A coordination-based strategy was employed to produce Ag nanoplates with high aspect ratios. Ag nanoplates were synthesized in the presence of acetonitrile, which served both as the co-solvent and as the ligand to form complexes with the Ag+ ions.

scholarly journals Direct formation of gold nanorods on surfaces using polymer-immobilised gold seeds

2016 ◽  
Vol 7 ◽  
pp. 809-816 ◽  
Author(s):  
Majid K Abyaneh ◽  
Pietro Parisse ◽  
Loredana Casalis
Keyword(s):  
Gold Nanorods ◽  
Growth Control ◽  
Weight Ratio ◽  
Polymer Nanocomposite ◽  
Gold Salt ◽  
Aspect Ratios ◽  
Direct Formation ◽  
Growth Method ◽  
Direct Growth ◽  
Gold Seed

Herein, we present the formation of gold nanorods (GNRs) on novel gold–poly(methyl methacrylate) (Au–PMMA) nanocomposite substrates with unprecedented growth control through the polymer molecular weight (M w) and gold-salt-to-polymer weight ratio. For the first time, GNRs have been produced by seed-mediated direct growth on surfaces that were pre-coated with polymer-immobilised gold seeds. A Au–PMMA nanocomposite formed by UV photoreduction has been used as the gold seed. The influence of polymer M w and gold concentration on the formation of GNRs has been investigated and discussed. The polymer nanocomposite formed with a lower M w PMMA and 20 wt % gold salt provides a suitable medium for growing well-dispersed GNRs. In this sample, the average dimension of produced GNRs is 200 nm in length with aspect ratios up to 10 and a distribution of GNRs to nanoparticles of nearly 22%. Suitable characterization techniques such as AFM and SEM have been used to support concept of the proposed growth method.

Controllable synthesis of Ni3−xCoxS4nanotube arrays with different aspect ratios grown on carbon cloth for high-capacity supercapacitors

RSC Advances ◽  
2015 ◽  
Vol 5 (60) ◽  
pp. 48631-48637 ◽  
Author(s):  
Rui Ding ◽  
Hong Gao ◽  
MingYi Zhang ◽  
Jing Zhang ◽  
XiTian Zhang
Keyword(s):  
Aspect Ratio ◽  
Electrochemical Properties ◽  
High Capacity ◽  
Molar Ratio ◽  
Carbon Cloth ◽  
Controllable Synthesis ◽  
Aspect Ratios

Aspect ratio and electrochemical properties of the Ni3−xCoxS4can be controlled by manipulating the Co/Ni molar ratio.

Cellular Uptake and Cytotoxicity of Varying Aspect Ratios of Gold Nanorods in HeLa Cells

2020 ◽  
Vol 3 (3) ◽  
pp. 1374-1384 ◽  
Author(s):  
Deshani Fernando ◽  
Shoukath Sulthana ◽  
Yolanda Vasquez
Keyword(s):  
Cellular Uptake ◽  
Gold Nanorods ◽  
Hela Cells ◽  
Aspect Ratios

scholarly journals Two-step synthesis of high aspect ratio gold nanorods

2006 ◽  
Vol 4 (1) ◽  
pp. 160-165 ◽  
Author(s):  
Tom Mortier ◽  
André Persoons ◽  
Thierry Verbiest
Keyword(s):  
Aspect Ratio ◽  
Gold Nanorods ◽  
High Aspect Ratio ◽  
Cetyltrimethylammonium Bromide ◽  
Surfactant Concentration ◽  
Synthetic Method ◽  
Aspect Ratios ◽  
Seed Mediated

AbstractWe describe a very simple, two-step synthetic method to prepare gold nanorods with extremely high aspect ratios (> 20) and average lengths of more than 1000 nm. The method is based on a seed-mediated growth in presence of the surfactant cetyltrimethylammonium bromide. The length and aspect ratios of the nanorods can be manipulated by varying the surfactant concentration.

The fate of silver ions in the photochemical synthesis of gold nanorods: an Extended X-ray Absorption Fine Structure Analysis

2009 ◽  
pp. 10367 ◽  
Author(s):  
Francesco Giannici ◽  
Tiziana Placido ◽  
Maria Lucia Curri ◽  
Marinella Striccoli ◽  
Angela Agostiano ◽  
...  
Keyword(s):  
Fine Structure ◽  
Structure Analysis ◽  
Gold Nanorods ◽  
Silver Ions ◽  
Photochemical Synthesis ◽  
X Ray ◽  
Absorption Fine ◽  
Fine Structure Analysis ◽  
X Ray Absorption

scholarly journals One-Pot Preparation of Metal–Polymer Nanocomposites in Irradiated Aqueous Solutions of 1-Vinyl-1,2,4-triazole and Silver Ions

Polymers ◽  
2021 ◽  
Vol 13 (23) ◽  
pp. 4235
Author(s):  
Alexey A. Zezin ◽  
Alexey A. Zharikov ◽  
Artem I. Emel’yanov ◽  
Alexander S. Pozdnyakov ◽  
Galina F. Prozorova ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Monomer Concentration ◽  
Gel Permeation Chromatography ◽  
Silver Ions ◽  
Polymer Nanocomposite ◽  
Molar Ratio ◽  
One Pot ◽  
Radiation Chemical ◽  
Vis Spectroscopy ◽  
Metal Polymer

Metal–polymer nanocomposite polyvinyltriazole–silver nanoparticles were obtained using one-pot synthesis in irradiated aqueous solutions of 1-vinyl-1,2,4-triazole (VT) and silver ions. Gel permeation chromatography data show that upon radiation initiation, the molecular weight of poly(1-vinyl-1,2,4-triazole) increases with increasing monomer concentration. To study the kinetics of polymerization and the features of the radiation–chemical formation of nanoparticles, UV-Vis spectroscopy was used. TEM images show a relatively small average size of the forming nanoparticles (2–3 nm) and a narrow size distribution, which shows the effective stabilization of nanoparticles by triazole substituents at a molar ratio of VT and silver ions of 25/1. The addition of ethyl alcohol was used to increase the efficiency of synthesis and suppress the crosslinking of macromolecules in solution. The results of the work show that aqueous–alcoholic solutions of 1 wt.% VT can be used to obtain soluble nanocomposite materials. 10 wt.% monomer solutions have prospects for use in the preparation of polymer gels filled with nanoparticles.

Mechanism for the Cellular Uptake of Targeted Gold Nanorods of Defined Aspect Ratios

Small ◽  
2016 ◽  
Vol 12 (37) ◽  
pp. 5178-5189 ◽  
Author(s):  
Hongrong Yang ◽  
Zhong Chen ◽  
Lei Zhang ◽  
Wing-Yin Yung ◽  
Ken Cham-Fai Leung ◽  
...  
Keyword(s):  
Cellular Uptake ◽  
Gold Nanorods ◽  
Aspect Ratios
Sign in / Sign up

Export Citation Format

Share Document