Determination of the aspect ratio statistical distribution of gold nanorods in solution from a theoretical fit of the observed inhomogeneously broadened longitudinal plasmon resonance absorption spectrum

2006 ◽  
Vol 100 (4) ◽  
pp. 044324 ◽  
Author(s):  
Susie Eustis ◽  
Mostafa A. El-Sayed
Keyword(s):  
Absorption Spectrum ◽  
Aspect Ratio ◽  
Gold Nanorods ◽  
Plasmon Resonance ◽  
Resonance Absorption ◽  
Statistical Distribution

A Hydride Generation-Nanosilver Surface Plasmon Resonance Absorption Spectral Method for the Determination of Trace Se(IV)

2013 ◽  
Vol 749 ◽  
pp. 491-494
Author(s):  
Ai Hui Liang ◽  
Qing Ye Liu ◽  
Gui Qing Wen ◽  
Ting Sheng Li ◽  
Zhi Liang Jiang
Keyword(s):  
Surface Plasmon Resonance ◽  
Detection Limit ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Water Samples ◽  
Hydride Generation ◽  
Resonance Absorption ◽  
Surface Plasmon Resonance Absorption ◽  
Hcl Solution

In HCl solution, the Se (IV) was reduced to SeH2 by NaBH4, and absorbed by solution of ethanol-AgNO3. The Ag+ was reduced to nanosilver that exhibited surface plasmon resonance absorption (SPR) peaks at 292 nm and 420 nm. Under the selected conditions, the value at 292 nm was linear to the concentration of Se (IV) in the range of 0.08-2.0 μg/mL, a detection limit of 0.04 μg/mL. The proposed method was applied to detect Se (IV) in water samples, with satisfactory results.

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.

Bleaching of plasmon-resonance absorption of gold nanorods decreases efficiency of cell destruction

2012 ◽  
Vol 17 (5) ◽  
pp. 058003 ◽  
Author(s):  
Florian Rudnitzki ◽  
Marco Bever ◽  
Ramtin Rahmanzadeh ◽  
Katrin Brieger ◽  
Elmar Endl ◽  
...  
Keyword(s):  
Gold Nanorods ◽  
Plasmon Resonance ◽  
Resonance Absorption ◽  
Cell Destruction

scholarly journals Aspect-ratio- and size-dependent emergence of the surface-plasmon resonance in gold nanorods – an ab initio TDDFT study

2014 ◽  
Vol 16 (5) ◽  
pp. 1820-1823 ◽  
Author(s):  
Xóchitl López-Lozano ◽  
Hector Barron ◽  
Christine Mottet ◽  
Hans-Christian Weissker
Keyword(s):  
Surface Plasmon Resonance ◽  
Aspect Ratio ◽  
Ab Initio ◽  
Surface Plasmon ◽  
Gold Nanorods ◽  
Plasmon Resonance ◽  
Size Dependent

Tire Treadwear — A Comprehensive Evaluation of the Factors: Generic Type, Aspect Ratio, Tread Pattern, and Tread Composition Part I: Introduction and Details on the Organization of the Program

1986 ◽  
Vol 14 (4) ◽  
pp. 201-218 ◽  
Author(s):  
A. G. Veith
Keyword(s):  
Aspect Ratio ◽  
Comprehensive Evaluation ◽  
Test Method ◽  
Interactive Effects ◽  
Data Analyses ◽  
Main Effect ◽  
Systematic Determination ◽  
Relationship Of ◽  
The Relationship

Abstract This four-part series of papers addresses the problem of systematic determination of the influence of several tire factors on tire treadwear. Both the main effect of each factor and some of their interactive effects are included. The program was also structured to evaluate the influence of some external-to-tire conditions on the relationship of tire factors to treadwear. Part I describes the experimental design used to evaluate the effects on treadwear of generic tire type, aspect ratio, tread pattern (groove or void level), type of pattern (straight rib or block), and tread compound. Construction procedures and precautions used to obtain a valid and functional test method are included. Two guiding principles to be used in the data analyses of Parts II and III are discussed. These are the fractional groove and void concept, to characterize tread pattern geometry, and a demonstration of the equivalence of wear rate for identical compounds on whole tread or multi-section tread tires.

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