scholarly journals Controlled synthesis of monodisperse gold nanorods with different aspect ratios in the presence of aromatic additives

2014 ◽  
Vol 16 (12) ◽  
Author(s):  
Yun Wang ◽  
Feihu Wang ◽  
Yuan Guo ◽  
Rongjun Chen ◽  
Yuanyuan Shen ◽  
...  
Keyword(s):  
Gold Nanorods ◽  
Controlled Synthesis ◽  
Aspect Ratios

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.

scholarly journals Gold Nanorods for Light-Based Lung Cancer Theranostics

2018 ◽  
Vol 19 (11) ◽  
pp. 3318 ◽  
Author(s):  
Oscar Knights ◽  
James McLaughlan
Keyword(s):  
Gold Nanorods ◽  
Photothermal Therapy ◽  
Continuous Wave ◽  
Low Cost ◽  
Laser System ◽  
Controlled Synthesis ◽  
Surface Plasmon Resonances ◽  
Plasmon Resonances ◽  
Theranostic Applications ◽  
Cancer Theranostics

Gold nanorods (AuNRs) have the potential to be used in photoacoustic (PA) imaging and plasmonic photothermal therapy (PPTT) due to their unique optical properties, biocompatibility, controlled synthesis, and tuneable surface plasmon resonances (SPRs). Conventionally, continuous-wave (CW) lasers are used in PPTT partly due to their small size and low cost. However, if pulsed-wave (PW) lasers could be used to destroy tissue then combined theranostic applications, such as PA-guided PPTT, would be possible using the same laser system and AuNRs. In this study, we present the effects of AuNR size on PA response, PW-PPTT efficacy, and PA imaging in a tissue-mimicking phantom, as a necessary step in the development of AuNRs towards clinical use. At equivalent NP/mL, the PA signal intensity scaled with AuNR size, indicating that overall mass has an effect on PA response, and reinforcing the importance of efficient tumour targeting. Under PW illumination, all AuNRs showed toxicity at a laser fluence below the maximum permissible exposure to skin, with a maximum of 80% cell-death exhibited by the smallest AuNRs, strengthening the feasibility of PW-PPTT. The theranostic potential of PW lasers combined with AuNRs has been demonstrated for application in the lung.

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.

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

Gold Nanorods: From Synthesis to Optical Properties

2014 ◽  
Vol 602-603 ◽  
pp. 993-997
Author(s):  
Gui Jun Ban ◽  
Xiu Li Fu ◽  
Zhi Jian Peng
Keyword(s):  
Optical Properties ◽  
Surface Plasmon Resonance ◽  
Surface Plasmon ◽  
Gold Nanorods ◽  
Plasmon Resonance ◽  
Localized Surface Plasmon ◽  
Excitation Wavelength ◽  
Surface Plasmon Resonance Peak ◽  
Plasmon Resonance Peak ◽  
Aspect Ratios

Gold nanorods with different aspect ratios, exhibiting localized surface plasmon resonance in a tuned longitudinal mode, were prepared by employing a seed mediated growth approach. Their third-order nonlinear optical properties were investigated by using femtosecond Z-scan technique at 800 nm. All the prepared gold nanorods with different aspect ratios exhibited a reverse saturation absorbance behavior, and the value of effective nonlinear absorption coefficient reaches its maximum when the longitudinal surface plasmon resonance peak of the gold nanorods located near the excitation wavelength.

scholarly journals Plasmonic Sensing Characteristics of Gold Nanorods with Large Aspect Ratios

Sensors ◽  
2018 ◽  
Vol 18 (10) ◽  
pp. 3458 ◽  
Author(s):  
Chao Zhuang ◽  
Yifan Xu ◽  
Ningsheng Xu ◽  
Jinxiu Wen ◽  
Huanjun Chen ◽  
...  
Keyword(s):  
Refractive Index ◽  
Gold Nanorods ◽  
High Performance ◽  
Near Infrared ◽  
High Refractive Index ◽  
Surface Enhanced Raman Spectroscopy ◽  
Sers Substrate ◽  
Refractive Index Sensitivity ◽  
Aspect Ratios ◽  
Plasmonic Sensing

Plasmonic gold nanorods play important roles in nowadays state-of-the-art plasmonic sensing techniques. Most of the previous studies and applications focused on gold nanorods with relatively small aspect ratios, where the plasmon wavelengths are smaller than 900 nm. Gold nanorods with large aspect ratios are predicted to exhibit high refractive-index sensitivity (Langmir 2008, 24, 5233–5237), which therefore should be promising for the development of high-performance plasmonic chemical- and bio-sensors. In this study, we developed gold nanorods with aspect ratios over 7.9, which exhibit plasmon resonances around 1064 nm. The refractive index (RI) sensitivity of these nanorods have been evaluated by varying their dielectric environment, whereby a sensitivity as high as 473 nm/RIU (refractive index unit) can be obtained. Furthermore, we have demonstrated the large-aspect-ratio nanorods as efficient substrate for surface enhanced Raman spectroscopy (SERS), where an enhancement factor (EF) as high as 9.47 × 108 was measured using 4-methylbenzenethiol (4-MBT) as probe molecule. Finally, a type of flexible SERS substrate is developed by conjugating the gold nanorods with the polystyrene (PS) polymer. The results obtained in our study can benefit the development of plasmonic sensing techniques utilized in the near-infrared spectral region.

Aspect ratio controlled synthesis of gold nanorods

2003 ◽  
Vol 20 (6) ◽  
pp. 1145-1148 ◽  
Author(s):  
Sung Koo Kang ◽  
Soonwoo Chah ◽  
Chang Yeon Yun ◽  
Jongheop Yi
Keyword(s):  
Aspect Ratio ◽  
Gold Nanorods ◽  
Controlled Synthesis
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