Colorimetric detection of glutathione based on transverse overgrowth of high aspect ratio gold nanorods investigated by MCR-ALS

RSC Advances ◽  
2015 ◽  
Vol 5 (101) ◽  
pp. 82906-82915 ◽  
Author(s):  
Nafiseh Fahimi-Kashani ◽  
Parisa Shadabipour ◽  
M. Reza Hormozi-Nezhad
Keyword(s):  
Aspect Ratio ◽  
Gold Nanorods ◽  
High Aspect Ratio ◽  
Colorimetric Detection ◽  
Plasmonic Sensor

In this paper, we present a simple platform for colorimetric detection of glutathione using gold nanorods (AR ∼ 6.5 ± 0.2) as a plasmonic sensor.

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

Seedless synthesis of high aspect ratio gold nanorods with high yield

2014 ◽  
Vol 2 (10) ◽  
pp. 3528 ◽  
Author(s):  
Xiaolong Xu ◽  
Yuanyuan Zhao ◽  
Xiangdong Xue ◽  
Shuaidong Huo ◽  
Fei Chen ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
Gold Nanorods ◽  
High Aspect Ratio ◽  
High Yield

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.

Effects of surfactant concentration on formation of high-aspect-ratio gold nanorods

2013 ◽  
Vol 407 ◽  
pp. 265-272 ◽  
Author(s):  
Yoshiko Takenaka ◽  
Youhei Kawabata ◽  
Hiroyuki Kitahata ◽  
Masaru Yoshida ◽  
Yoko Matsuzawa ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
Gold Nanorods ◽  
High Aspect Ratio ◽  
Surfactant Concentration

scholarly journals Hydroquinone-Based Fabrication of Gold Nanorods with a High Aspect Ratio and LSPR Greater than 850 nm to Be Used as a Surface Plasmon Resonance Platform for Rapid Detection of Thiophanate Methyl

2020 ◽  
Vol 10 (10) ◽  
pp. 3654
Author(s):  
Hang Nguyen Thi Nhat ◽  
Ngoc Thuy Trang Le ◽  
Nguyen Thi Phuong Phong ◽  
Dai Hai Nguyen ◽  
Minh-Tri Nguyen-Le
Keyword(s):  
Surface Plasmon Resonance ◽  
Aspect Ratio ◽  
Surface Plasmon ◽  
Gold Nanorods ◽  
Plasmon Resonance ◽  
High Aspect Ratio ◽  
Rapid Detection ◽  
Plasmon Resonance Peak ◽  
Thiophanate Methyl ◽  
X Ray

The use of gold nanorods (AuNRs) as surface-enhanced Raman scattering (SERS) substrates has gained much attraction due to their remarkably aspect-ratio-dependent plasmonic properties. In this report, we described the development of AuNRs with a high aspect ratio and longitudinal surface plasmon resonance (LSPR) >850 nm through a hydroquinone-based fabrication with minor modifications. The synthesis started with the reduction of chloroauric acid (HAuCl4) by sodium borohydride (NaBH4) to make gold nanoseeds from which AuNRs were grown with the aid of silver nitrate (AgNO3), HAuCl4, cetyltrimethylammonium bromide (CTAB), and hydroquinone (HQ). Scanning electron microscopy coupled with energy-dispersive X-ray (SEM-EDX), Transmission electron microscope (TEM), X-ray diffraction (XRD) and Ultra-violet-Visible spectroscopy (UV-Vis) were performed to study the shape, size, and structural and optical properties of AuNRs, respectively. The results showed that AuNRs with high aspect ratios (AR > 3) were single crystals with a heterogenous size distribution, and that the growth of Au nanoseeds into AuNRs took place along the [001] direction. AuNRs exhibited two plasmon resonance peaks at 520 nm and 903 nm, while gold nanoseeds had only a plasmon resonance peak at 521 nm. The as-synthesized AuNRs also showed SERS effects for thiophanate methyl, a broad-spectrum fungicide, with the limit of detection down to 5 mg/L of the fungicide. AuNR-coated glass can serve as a SERS-based sensing platform for rapid detection of thiophanate methyl with high sensitivity and reproducibility.

pH Controlled Synthesis of High Aspect-Ratio Gold Nanorods

2008 ◽  
Vol 8 (11) ◽  
pp. 5708-5714 ◽  
Author(s):  
Qingshan Wei ◽  
Jian Ji ◽  
Jiacong Shen
Keyword(s):  
Aspect Ratio ◽  
Gold Nanorods ◽  
High Aspect Ratio ◽  
Cetyltrimethylammonium Bromide ◽  
Slow Growth ◽  
Ph Value ◽  
Building Blocks ◽  
Gold Nanospheres ◽  
One Dimensional ◽  
Growth Ph

Here we report the two-step synthesis of high aspect-ratio gold nanorods via combining low pH growth and higher cetyltrimethylammonium bromide concentration. The approach is motivated by the "slow growth principle," which has been demonstrated recently as a effective protocol to prepare high aspect-ratio one-dimensional nanostructures. When the pH value of the growth solution gradually decreased, the growth rate of nanorods was significantly decreased and a continuous morphological changing from uniform monodisperse gold nanospheres to extraordinary long gold nanorods occured. By simultaneously decreasing the growth pH and increasing the concentration of cetyltrimethylammonium bromide, the length of gold nanorods could be further elongated to above 2 μm with large aspect-ratio of above 80. This kind of high aspect-ratio gold nanorods could be excellent building blocks for optical or electrical nanodevices in future.

Synthesis of gold nanorods with a high aspect ratio using a seeding agent

2010 ◽  
Vol 44 (4) ◽  
pp. 511-516
Author(s):  
B. Altansukh ◽  
G. Burmaa ◽  
Zhianshi Jao ◽  
Dan Van ◽  
S. A. Antsiferova
Keyword(s):  
Aspect Ratio ◽  
Gold Nanorods ◽  
High Aspect Ratio ◽  
Seeding Agent

State-of-the-art strategies for the colorimetric detection of heavy metals using gold nanorods based on aspect ratio reduction

2016 ◽  
Vol 8 (10) ◽  
pp. 2131-2137 ◽  
Author(s):  
Sruthi Ann Alex ◽  
N. Chandrasekaran ◽  
Amitava Mukherjee
Keyword(s):  
Heavy Metals ◽  
Aspect Ratio ◽  
Gold Nanorods ◽  
State Of The Art ◽  
Colorimetric Detection ◽  
Detection Techniques ◽  
Ratio Reduction

Current colorimetric detection techniques for metals using gold nanorods based on variations in the aspect ratio have been summarized.

High-aspect-ratio gold nanorods synthesized in a surfactant gel phase

2009 ◽  
Vol 467 (4-6) ◽  
pp. 327-330 ◽  
Author(s):  
Yoshiko Takenaka ◽  
Hiroyuki Kitahata
Keyword(s):  
Aspect Ratio ◽  
Gold Nanorods ◽  
High Aspect Ratio ◽  
Gel Phase
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