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 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 Investigation on the Effect of Centrifugation Speed on the Shape Separation of Gold Nanorods

2018 ◽  
Vol 7 (4.30) ◽  
pp. 330 ◽  
Author(s):  
Caessandra Addine Minun ◽  
Nur Zehan An’Nisa ◽  
Marlia Morsin ◽  
Nur Liyana Razali ◽  
Suratun Nafisah ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
Gold Nanorods ◽  
Localized Surface Plasmon Resonance ◽  
Crystal Orientation ◽  
Surface Density ◽  
Morphological Analysis ◽  
Localized Surface Plasmon ◽  
Plasmon Peak ◽  
Sensing Material ◽  
Growth Method

High-quality gold nanorods (AuNRs) with a uniform aspect ratio and sizes are crucial for applications in biomedical or sensor industry. AuNRs is implementing Localized Surface Plasmon Resonance (LSPR) as sensing method which is highly dependent on the size, separation of nanoparticles, aspect ratio and the shape of the nanoparticles. Thus, in this process, the shape, surface density and aspect ratio of AuNRs were investigated to be used further as LSPR sensing material. The AuNRs was prepared using Seed Mediated Growth Method (SMGM) and the growth solution of the AuNRs was centrifuged with the speed ranging from 2500 rpm to 5000 rpm to separate the particles shaper prior to deposition as thin film. The XRD result shows the peak at 2θ = 38º which shows the (111) crystal orientation of the AuNRs. There are also two distinct peaks formed at the absorption spectra graph obtained from the UV-Vis result which associated with transverse plasmon peak (t-LSPR) and longitudinal plasmon peak (l-LSPR). The t-LSPR peak is significantly smaller than the l-LSPR and located in the wavelength ranges from 500 nm to 560 nm whereas the l-LSPR of the AuNRs shows a stronger and a higher peak which is located in the wavelength ranges from 700 nm to 780 nm. The morphological analysis using FESEM shows that the higher centrifugation speed separates the AuNRs with higher aspect ratio and higher surface density.

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 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).

Preparation and Growth Mechanism of Gold Nanorods (NRs) Using Seed-Mediated Growth Method

2003 ◽  
Vol 15 (10) ◽  
pp. 1957-1962 ◽  
Author(s):  
Babak Nikoobakht ◽  
Mostafa A. El-Sayed
Keyword(s):  
Growth Mechanism ◽  
Gold Nanorods ◽  
Growth Method ◽  
Seed Mediated

Seed-Mediated Synthesis of one-Dimensional Fe3O4 Particles under Magnetic Field

2011 ◽  
Vol 311-313 ◽  
pp. 576-580
Author(s):  
Pei Feng Yu ◽  
Xi Yun Yang ◽  
Hai Wei Yuan
Keyword(s):  
Magnetic Field ◽  
Reaction Time ◽  
Aspect Ratio ◽  
Seed Size ◽  
Volume Ratio ◽  
Iron Salt ◽  
One Dimensional ◽  
Growth Method ◽  
Magnetite Particles ◽  
Seed Mediated

One-dimensional magnetite particles were prepared by a seed-mediated growth method under magnetic field. The amount of seed, seed size, PolyvinylPyrrolidone concentration (PVP) and reaction time have a significant effect on the morphology of the samples. The addition of a small amount of 100nm seeds leads to obtain rod-like particles, while chain-like particles are formed when the seed size is increased to 700 nm. The aspect ratio of the rod is controlled by varying the volume ratio of seed to iron salt. Increasing the reaction time is favorable to the formation of chain-like particles.

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.

The Effect of Nanoseed Concentration on the Aspect Ratio of Gold Nanorod

2011 ◽  
Vol 364 ◽  
pp. 254-259 ◽  
Author(s):  
Sri Nengsih ◽  
Ali Umar Akrajas ◽  
Muhamad Mat Salleh
Keyword(s):  
Aspect Ratio ◽  
Present Approach ◽  
Gold Nanorod ◽  
Growth Solution ◽  
Growth Method ◽  
Potential Alternative ◽  
Seed Mediated ◽  
Drop Structure ◽  
Typical Process

This paper reports the synthesis of gold nanorod with controlled aspect ratio prepared by varying the concentration of nanoseed addition into the growth solution via seed mediated growth method. In typical process, the gold nanorod with aspect ratio from ca. 1.7 to 3.1 can be successfully obtained. The nanorod seems to be perfect rod morphology instead of bone-like or tear drop structure. Owing to the simplicity in preparing the gold nanorod, the present approach could be used as potential alternative for producing gold nanorod with special properties for used in the currently existing application.

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