scholarly journals SEEDED GROWTH SYNTHESIS OF GOLD NANORODS FOR PHOTOTHERMAL APPLICATION

2018 ◽  
Vol 56 (2) ◽  
pp. 148
Author(s):  
Hue Thi Do ◽  
Vu Thi Thuy Duong ◽  
Nguyen Trong Nghia ◽  
Nhung Hong Tran ◽  
Lien Thi Ha Nghiem
Keyword(s):  
Ascorbic Acid ◽  
Aspect Ratio ◽  
Gold Nanorods ◽  
Growth Yield ◽  
Seeded Growth ◽  
Surfactant Templating ◽  
Seed Mediated

In this paper, the gold nanorods (GNRs) were synthesized via a seed-mediated method using 1-3 nm seeds-in diameter and gold atoms created from the reduced Au3+ ions by ascorbic acid (AA) in the presence of cetyltrimethylammonnium bromide (CTAB) as a surfactant templating. The aspect ratio of GNRs as well as growth yield was controlled by adjusting the concentration of Ag+ ions.

scholarly journals Seed-Mediated Growth of Gold Nanorods: Limits of Length to Diameter Ratio Control

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Christopher J. Ward ◽  
Robert Tronndorf ◽  
Alicia S. Eustes ◽  
Maria L. Auad ◽  
Edward W. Davis
Keyword(s):  
Ascorbic Acid ◽  
Aspect Ratio ◽  
Gold Nanorods ◽  
Reducing Agent ◽  
Gold Content ◽  
Reaction Conditions ◽  
Growth Solution ◽  
Transmission Electron ◽  
Seed Mediated

The effects of the seed reaction conditions on the two-step seed-mediated growth of gold nanorods and the effect of gold and reducing agent content in the growth solution were evaluated. Results indicate that the reaction conditions used to produce the seeds have a significant impact on the aspect ratio of the gold nanorods produced. Increasing the concentration of gold or the reaction temperature in the seed production step results in lower length to diameter (aspect ratio) gold rods. In addition, the amount of prepared seed added to the growth solution impacts the rod aspect ratio, with increasing amounts of seed reducing the aspect ratio. The effects of reducing agent, ascorbic acid (AA), and gold content of the growth solution on the aspect ratio of the produced rods are strongly interrelated. There exists a minimum ascorbic acid to gold concentration below which rods will not form; however, increasing the ratio above this minimum results in shorter rods being formed. Characterization of nanorod growth is performed by UV-vis-NIR spectrophotometry and transmission electron microscopy (TEM).

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 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.

scholarly journals Investigation of thermal conductivity property of plasmonic nanofluids based on gold nanorods prepared by seed-mediated growth method

2019 ◽  
Vol 2 (22) ◽  
pp. 119-133
Author(s):  
Mahsa Mohammadzadeh ◽  
Mohsen Ashjari ◽  
Davoud Zare
Keyword(s):  
Thermal Conductivity ◽  
Aspect Ratio ◽  
Gold Nanorods ◽  
Thermal Conductivity Coefficient ◽  
Volume Fraction ◽  
Effect Of Temperature ◽  
Basic Fluid ◽  
Vis Spectroscopy ◽  
Growth Method ◽  
Seed Mediated

In this paper, nanofluids were prepared based on gold nanorods in basic fluid, water, by single-stage chemical reduction and in different volume fractions and the used gold nanorods were synthesized by seed-mediated growth method in different dimensional ratios. The properties of the prepared nanoparticles, including crystalline size, aspect ratio, surface properties, nanoparticle purity, shape and morphology of nanostructures were investigated using x-ray diffraction, UV-vis spectroscopy, FT-IR, and transmitted electron microscopy. The effect of changing parameters of Nano rod dimensions, changes in Nano rod volume fraction in water and also the effect of temperature on the nanofluid thermal conductivity coefficient were investigated using transient hot wire method. The results showed that reducing the aspect ratio, increasing the volume fraction and increasing the temperature increase the thermal conductivity. In fact, results show that an increase in the nanorods aspect ratio with a constant volume fraction of 1:50 of gold in water nanorod and at room temperature leads to a decrease in the thermal conductivity of the nanofluid. Also, increasing the two parameters of volume fraction and temperature significantly increases the thermal conductivity coefficient.

scholarly journals Seed-Mediated Synthesis of Tunable-Aspect-Ratio Gold Nanorods for Near-Infrared Photoacoustic Imaging

2018 ◽  
Vol 13 (1) ◽  
Author(s):  
Pengwei Li ◽  
Yiduo Wu ◽  
Dingding Li ◽  
Xiaoxiao Su ◽  
Cuixian Luo ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
Gold Nanorods ◽  
Near Infrared ◽  
Photoacoustic Imaging ◽  
Seed Mediated

Seed-Mediated Synthesis of High Aspect Ratio Gold Nanorods with Nitric Acid

2005 ◽  
Vol 17 (25) ◽  
pp. 6447-6451 ◽  
Author(s):  
Hsiang-Yang Wu ◽  
Hsin-Cheng Chu ◽  
Tz-Jun Kuo ◽  
Chi-Liang Kuo ◽  
Michael H. Huang
Keyword(s):  
Nitric Acid ◽  
Aspect Ratio ◽  
Gold Nanorods ◽  
High Aspect Ratio ◽  
Seed Mediated

Synthesis and Characterization of Silver Nanoplates by a Seed-mediated Method

2019 ◽  
Vol 29 (3) ◽  
Author(s):  
Mai Ngọc Tuan Anh
Keyword(s):  
Hydrogen Peroxide ◽  
Silver Nanoparticles ◽  
Ascorbic Acid ◽  
Silver Nitrate ◽  
Sodium Borohydride ◽  
Trisodium Citrate ◽  
Synthesis And Characterization ◽  
Silver Nanoplates ◽  
Seed Mediated

Silver nanoplates (SNPs) having different size were synthesized by a seed-mediated method. The seeds -silver nanoparticles with 4 – 6 nm diameters were synthesized first by reducing silver nitrate with sodium borohydride in the present of Trisodium Citrate and Hydrogen peroxide. Then these seeds were developed by continue reducing Ag\(^+\) ions with various amount of L-Ascorbic acid to form SNPs. Our analysis showed that the concentratrion of L-Ascorbic acid, a secondary reducing agent, played an important role to form SNPs. In addition, the size and in-plane dipole plasmon resonance wavelenght of silver nanoplates were increased when the concentration of added silver nitrate increased. The characterization of SNPs were studied by UV-Vis, FE-SEM, EDS and TEM methods.

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.

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