Shape and Size Effect on Photothermal Heat Elevation of Gold Nanoparticles: Absorption Coefficient Experimental Measurement of Spherical and Urchin-Shaped Gold Nanoparticles

2019 ◽  
Vol 123 (28) ◽  
pp. 17548-17554 ◽  
Author(s):  
Hanane Moustaoui ◽  
Justine Saber ◽  
Ines Djeddi ◽  
Qiqian Liu ◽  
Amadou Thierno Diallo ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Absorption Coefficient ◽  
Size Effect ◽  
Experimental Measurement ◽  
Shape And Size

Size, Shape, and Wavelength Effect on Photothermal Heat Elevation of Gold Nanoparticles: Absorption Coefficient Experimental Measurement

2020 ◽  
Vol 37 (12) ◽  
pp. 2000255
Author(s):  
Amadou Thierno Diallo ◽  
Malika Tlemçani ◽  
Memona Khan ◽  
Jolanda Spadavecchia ◽  
Nadia Djaker
Keyword(s):  
Gold Nanoparticles ◽  
Absorption Coefficient ◽  
Experimental Measurement

THEORETICAL MODEL FOR THE CALCULATION OF OPTICAL PROPERTIES OF GOLD NANOPARTICLES

2010 ◽  
Vol 19 (03) ◽  
pp. 427-436
Author(s):  
A. MENDOZA-GARCÍA ◽  
A. ROMERO-DEPABLOS ◽  
M. A. ORTEGA ◽  
J. L. PAZ ◽  
L. ECHEVARRÍA
Keyword(s):  
Gold Nanoparticles ◽  
Refractive Index ◽  
Optical Properties ◽  
Theoretical Model ◽  
Absorption Coefficient ◽  
Molecular System ◽  
Two Dimensional ◽  
Box Models ◽  
Solvent Environment ◽  
Absorption And Dispersion

We have developed an analytical method to describe the optical properties of nanoparticles, whose results are in agreement with the observed experimental behavior according to the size of the nanoparticle under analysis. Our considerations to describe plasmonic absorption and dispersion are based on the combination of the two-level molecular system and the two-dimensional quantum box models. Employing the optical stochastic Bloch equations, we have determined the system's coherence, from which we have calculated expressions for the absorption coefficient and refractive index. The innovation of this methodology is that it allows us to take into account the solvent environment, which induce quantum effects not considered by classical treatments.

Shape and Size Control of Substrate-Grown Gold Nanoparticles for Surface-Enhanced Raman Spectroscopy Detection of Chemical Analytes

2018 ◽  
Vol 122 (4) ◽  
pp. 2307-2314 ◽  
Author(s):  
Michael J. Ashley ◽  
Marc R. Bourgeois ◽  
Raghavendra R. Murthy ◽  
Christine R. Laramy ◽  
Michael B. Ross ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Raman Spectroscopy ◽  
Size Control ◽  
Surface Enhanced Raman Spectroscopy ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Shape And Size

Shape and size separation of gold nanoparticles using glucose gradient density

2012 ◽  
Author(s):  
Marta Gordel ◽  
Joanna Olesiak-Banska ◽  
Katarzyna Matczyszyn ◽  
Claude Nogues ◽  
K. Pawlik ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Size Separation ◽  
Gradient Density ◽  
Shape And Size

The size-effect of gold nanoparticles and nanoclusters in the inhibition of amyloid-β fibrillation

Nanoscale ◽  
2017 ◽  
Vol 9 (12) ◽  
pp. 4107-4113 ◽  
Author(s):  
Guanbin Gao ◽  
Mingxi Zhang ◽  
Dejun Gong ◽  
Rui Chen ◽  
Xuejiao Hu ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Size Effect ◽  
Amyloid Β

Photoacoustic Measurement of a-Si:H/a-SiNx:H Superlattice Films

1986 ◽  
Vol 77 ◽  
Author(s):  
Feng Xiaomei ◽  
Liu Hsiangna ◽  
Wang Zhichao ◽  
Qiu Shuye ◽  
He Yuliang
Keyword(s):  
Absorption Coefficient ◽  
Size Effect ◽  
Layer Thickness ◽  
Optical Transmission ◽  
Transmission Spectra ◽  
Superlattice Structure ◽  
Quantum Size ◽  
Peak Intensity ◽  
Optical Transmission Spectra ◽  
Photoacoustic Measurement

ABSTRACTPhotoacoustic (PAS) and optical transmission spectra were measured on a-Si:H/a-SiNx:H superlattices. The absorption coefficient ∝ in the range 102∼104 cm-1 was obtained by converting the PAS signal to ∝. The enhancement of the PAS peak intensity Qs and the increase in the width of the Urbach edge with decreasing a-Si:H layer thickness are explained as results of quantum size effect in the superlattice structure.

scholarly journals Investigating the Role of Shape and Size of Gold Nanoparticles on Their Toxicities to Fungi

2018 ◽  
Author(s):  
Kangze Liu ◽  
Zhonglei He ◽  
Hugh J. Byrne ◽  
James Curtin ◽  
Furong Tian
Keyword(s):  
Gold Nanoparticles ◽  
Penicillium Chrysogenum ◽  
Survival Rates ◽  
Relative Survival ◽  
Toxicity Assessment ◽  
Mucor Hiemalis ◽  
Wide Range ◽  
Living Organisms ◽  
Shape And Size

The possibility of releasing gold nanoparticles (GNP) into the environment has been rapidly increasing with the wide spread and flourishing application of gold nanoparticles (GNPs) in a wide range of areas. Consequently, environmental effects of GNP, especially toxicities to living organisms have drawn great attention. However, their toxicological characteristics still remain unclear. Fungi, as the decomposers of the ecosystem, interact directly with the environment and critically control the overall health of the biosphere. Thus, their sensitivity to GNP toxicity is particularly important. The aim of this study was to evaluate the role of shape and size of GNPs on their toxicities to fungi, which could help reveal the ecotoxicity of GNPs. Aspergillus niger, Mucor hiemalis and Penicillium chrysogenum were chosen for toxicity assessment, and circular and star/flower-shaped GNPs sized from 0.7 nm to large aggregates of 400 nm have been synthesised. After mixed with GNPs and reacting agents of GNPs accordingly and incubated for 48 hours, the relative survival rates of each kind of fungus was calculated and compared. The results indicated that with similar sizes, star/flower-shaped GNPs are more toxic to fungi than circular-shaped GNPs; the toxicity of star/flower-shaped GNPs increases with smaller sizes. The results also showed that different species of fungus reacts differently to same GNPs, and Penicillium chrysogenum was relatively more sensitive under the exposure to GNPs.

scholarly journals Formation of anisotropic gold nanoparticles on indium tin oxide substrates as a plasmonic sensing material

2020 ◽  
Vol 10 ◽  
pp. 184798042096538
Author(s):  
Nur Liyana Razali ◽  
Marlia Morsin ◽  
Suratun Nafisah ◽  
Nur Zehan An’nisa Md Shah ◽  
Farhanahani Mahmud ◽  
...  
Keyword(s):  
Thin Film ◽  
Gold Nanoparticles ◽  
Process Parameters ◽  
Indium Tin Oxide ◽  
Growth Time ◽  
Hexadecyltrimethylammonium Bromide ◽  
Capping Agent ◽  
Film Sensor ◽  
Sensing Material ◽  
Shape And Size

A simple technique of seed-mediated growth has been successfully performed to grow anisotropy gold nanoparticles on solid substrates. The growth of the gold nanoparticles has been carried out in the presence of a binary surfactant mixture of hexadecyltrimethylammonium bromide with two different molecular weights of a capping agent, namely polyvinylpyrrolidone: 40,000 and 55,000. In this study, the effect of process parameters, growth time and molecular weight of capping agent was investigated. The growth time shows a significant impact on the shape and size of nanoparticles. The shorter growth time produced small spherical to square-like shape particles, whereas bigger particles including nanorods, nanosquares and nanotriangles were formed with longer growth time. The shape controlling agent, polyvinylpyrrolidone, was used to synthesis gold nanoparticles. It was found that monodisperse gold nanoparticles with uniform shape and size are hardly obtained when polyvinylpyrrolidone 40,000 was used as capping agent. Polyvinylpyrrolidone 55,000 produced more uniform shape and size of gold nanoparticles. Thus, these process parameters were found affected to the size, shape, surface density and uniformity of gold nanoparticles. This sample was further applied as a sensing material in the detection of toxic fungicide, namely chlorothalonil. The sensitivity of the sensor system was determined by the changes in peak positions and intensities of the transverse and longitudinal surface plasmon resonance peaks on different medium, that is, air, deionized water and chlorothalonil solution. The sensor response of gold nanoparticles thin film in 30 mM chlorothalonil showed two resonance peaks in comparison to the control experiment without gold nanoparticle thin film. The gold nanoparticles thin film sensor was successfully synthesized and potentially useful as a sensing material for fungicide detection.

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