Gold nanorod synthesis catalysed by Au clusters

2016 ◽  
Vol 191 ◽  
pp. 205-213 ◽  
Author(s):  
Yasser A. Attia ◽  
Carlos Vázquez-Vázquez ◽  
M. Carmen Blanco ◽  
David Buceta ◽  
M. Arturo López-Quintela
Keyword(s):  
Aspect Ratio ◽  
Gold Nanorods ◽  
Growth Control ◽  
Reaction Times ◽  
Good Control ◽  
Silver Ions ◽  
Gold Nanorod ◽  
Anisotropic Growth ◽  
Simple Scheme ◽  
Au Clusters

Gold nanorods have been successfully synthesized by the seed mediated method using Au clusters. This synthesis does not require silver ions to obtain large amounts of Au nanorods and has good control over their aspect ratio. Au clusters are produced with the same recipe as for Au seeds, but using shorter reaction times. This very simple scheme confirms the important catalytic influence of clusters in the anisotropic growth control.

Preparation of Au@Ag Core-Shell Nanorods and Investigation of its Surface Plasmon

2012 ◽  
Vol 535-537 ◽  
pp. 446-449
Author(s):  
Wei Yuan ◽  
Pei Jie Wang ◽  
Yan Fang
Keyword(s):  
Aspect Ratio ◽  
Surface Plasmon ◽  
Gold Nanorods ◽  
Chemical Reduction ◽  
Silver Ions ◽  
Blue Shift ◽  
Core Shell ◽  
Transverse Modes ◽  
Growth Method ◽  
Length Width

Different aspect ratio (length/width) gold nanorods were prepared in aqueous solution by seeding growth method. Aspect ratio of the nanorods was controlled accurately by changing the silver ions concentration. Ultraviolet-visible (UV-vis) spectra demonstrate the regularation that longitudinal plasmon resonance absorption wavelength of gold nanorods reveal red shift with the increase of aspect ratio. Gold nanorods were wrapped with Ag shells by chemical reduction silver ions on its surface. Different from gold nanorods, the transverse modes of the Au@Ag core-shell nanorods have two bands which contributed from the Ag and Au, respectively. On the other hand, centers of longitudinal surface plasmon of the core-shell nanorods exhibit blue shift with the Ag shell thickness increasing.

Effect of aspect ratio on the chirality of gold nanorods prepared through conventional seed-mediated growth method

2021 ◽  
Vol 1152 ◽  
pp. 338277
Author(s):  
Xiaojuan Zhou ◽  
Qiang Liu ◽  
Xiaoyu Shi ◽  
Chunli Xu ◽  
Baoxin Li
Keyword(s):  
Aspect Ratio ◽  
Gold Nanorods ◽  
Growth Method ◽  
Seed Mediated

scholarly journals Effective replacement of cetyltrimethylammonium bromide (CTAB) by mercaptoalkanoic acids on gold nanorod (AuNR) surfaces in aqueous solutions

Nanoscale ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 658-668 ◽  
Author(s):  
Rafael del Caño ◽  
Jose M. Gisbert-González ◽  
Jose González-Rodríguez ◽  
Guadalupe Sánchez-Obrero ◽  
Rafael Madueño ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Gold Nanorods ◽  
Ligand Exchange ◽  
Cetyltrimethylammonium Bromide ◽  
Gold Nanorod ◽  
Experimental Conditions ◽  
Seed Mediated ◽  
The Stability

The highly packed cetyltrimethylammonium bromide bilayer on the surface of gold nanorods synthesized by the seed-mediated procedure hampers the complete ligand exchange under experimental conditions that preserves the stability of the dispersions.

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.

Optimum morphology of gold nanorods for light-induced hyperthermia

Nanoscale ◽  
2018 ◽  
Vol 10 (5) ◽  
pp. 2632-2638 ◽  
Author(s):  
Jordi Morales-Dalmau ◽  
Clara Vilches ◽  
Ignacio de Miguel ◽  
Vanesa Sanz ◽  
Romain Quidant
Keyword(s):  
Gold Nanorods ◽  
Systematic Study ◽  
Gold Nanorod ◽  
Cellular Toxicity ◽  
Induced Hyperthermia

A systematic study of the influence of gold nanorod morphology on cellular toxicity, uptake and light to heat conversion.

scholarly journals Gold nanorod-assembled ZnGa2O4:Cr nanofibers for LED-amplified gene silencing in cancer cells

Nanoscale ◽  
2018 ◽  
Vol 10 (28) ◽  
pp. 13432-13442 ◽  
Author(s):  
Lun Qin ◽  
Peijian Yan ◽  
Congkun Xie ◽  
Jie Huang ◽  
Zhaohui Ren ◽  
...  
Keyword(s):  
Gene Silencing ◽  
Cancer Cells ◽  
Gold Nanorods ◽  
Gold Nanorod ◽  
Photothermal Effect ◽  
Therapeutic System

A localized therapeutic system, consisting of gold nanorods (Au NRs) loaded with hTERT siRNA assembled on the surface of ZnGa2O4:Cr (ZGOC) nanofibers, offers the potential for a LED-induced mild photothermal effect which enhances gene silencing effect in cancer cells.

ENERGETICALLY AND STERICALLY FAVORABLE ASSEMBLY OF IDENTICAL GOLD NANORODS WITH VARYING CONCENTRATIONS OF NANOSPHERES

2021 ◽  
pp. 2150028
Author(s):  
IMTIAZ AHMAD ◽  
AKHLAQ HUSSAIN ◽  
AMBREEN ALI ◽  
RAHIM JAN
Keyword(s):  
Gold Nanorods ◽  
Self Assembly ◽  
Gold Nanorod ◽  
Potential Well ◽  
Separation Effect ◽  
Face To Face ◽  
Inner Region

Gold nanorod ribbon-like arrays as well as shape-separation effect of rods from sphere-like nanoparticles have been evaluated for identical nanorod suspension with various concentration of nanospheres. These sphere-rod mixtures are prepared with help of different amounts of AgNO3. Deposits of nanoparticles at various positions of the coffee-stain ring are observed in different arrangements. For instance, face-to-face aligned nanorods get settled in ribbon-like superstructures and these arrays are observed to be self-separated from spheres. Self-assembly and shape-separation effect are observed more systematic at the outer-edges than the inner-region of the coffee-stain ring. Experimentally, it has been observed that face-to-face formation of nanorods in suspension is energetically more probable arrangement. As the separation between two nanorods increases, the depth of potential well decreases, indicating that the upper layers of nanorods are more under the influence of lower placed nanorods than those placed in the same plane. Energetically and sterically, more feasible arrangements are observed.

Peptide Controlled Assembly of Palladium Nanoparticles on High-Aspect-Ratio Gold Nanorods

2020 ◽  
Vol 124 (50) ◽  
pp. 27743-27753
Author(s):  
John Tyler Wagner ◽  
Analeece K. Long ◽  
Michael B. Sumner ◽  
Ivan Cockman ◽  
Marvin Smith ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
Gold Nanorods ◽  
High Aspect Ratio ◽  
Palladium Nanoparticles ◽  
Controlled Assembly

scholarly journals SANS study of mixed cholesteric cellulose nanocrystal – gold nanorod suspensions

2020 ◽  
Vol 56 (85) ◽  
pp. 13001-13004
Author(s):  
Jonas Van Rie ◽  
Guillermo González-Rubio ◽  
Sugam Kumar ◽  
Christina Schütz ◽  
Joachim Kohlbrecher ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Gold Nanorods ◽  
Small Angle ◽  
Cellulose Nanocrystals ◽  
Self Assembly ◽  
Small Angle Neutron Scattering ◽  
Gold Nanorod ◽  
Cellulose Nanocrystal

Self-assembly of cellulose nanocrystals (CNCs) doped with anisotropic gold nanorods (AuNRs) was studied by small-angle neutron scattering.

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