Dipole and quadrupole surface plasmon resonance contributions in formation of near-field images of a gold nanosphere

Shopa, Mykola; Kolwas, K.; Derkachova, A.; Derkachov, G.

doi:10.2478/s11772-010-0047-2

Cited by 26 publications

(23 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Additionally, we endeavored to keep the size of the AuNPs below the threshold for electric quadrupole resonance, simplifying the analysis of the spectra. AuNPs possess electric quadrupole and magnetic dipole moments, and different authors have reported various thresholds for electric quadrupole resonance of AuNPs ranging from ~60 or 70 53,54 to ~150 nm Ø. 52 The AuNPs were synthesized as described in the Experimental Section.…”

Section: Mean Diameter Determination and Size Distributions Of The Comentioning

confidence: 99%

Self-healing gold mirrors and filters at liquid–liquid interfaces

et al. 2016

View full text Add to dashboard Cite

The optical and morphological properties of lustrous metal self-healing liquid-like nanofilms were systematically studied for different applications (e.g., optical mirrors or filters). These nanofilms were formed by a one-step self-assembly methodology of gold nanoparticles (AuNPs) at immiscible water-oil interfaces, previously reported by our group. We investigated a host of experimental variables and herein report their influence on the optical properties of nanofilms: AuNP mean diameter, interfacial AuNP surface coverage, nature of the organic solvent, and nature of the lipophilic organic molecule that caps the AuNPs in the interfacial nanofilm. To probe the interfacial gold nanofilms we used in situ (UV-vis-NIR spectroscopy and optical microscopy) as well as ex situ (SEM and TEM of interfacial gold nanofilms transferred to silicon substrates) techniques. The interfacial AuNP surface coverage strongly influenced the morphology of the interfacial nanofilms, and in turn their maximum reflectance and absorbance. We observed three distinct morphological regimes; (i) smooth 2D monolayers of "floating islands" of AuNPs at low surface coverages, (ii) a mixed 2D/3D regime with the beginnings of 3D nanostructures consisting of small piles of adsorbed AuNPs even under sub-full-monolayer conditions and, finally, (iii) a 3D regime characterised by the 2D full-monolayer being covered in significant piles of adsorbed AuNPs. A maximal value of reflectance reached 58% in comparison with a solid gold mirror, when 38 nm mean diameter AuNPs were used at a water-nitrobenzene interface. Meanwhile, interfacial gold nanofilms prepared with 12 nm mean diameter AuNPs exhibited the highest extinction intensities at ca. 690 nm and absorbance around 90% of the incident light, making them an attractive candidate for filtering applications. Furthermore, the interparticle spacing, and resulting interparticle plasmon coupling derived optical properties, varied significantly on replacing tetrathiafulvalene with neocuproine as the AuNP capping ligand in the nanofilm. These interfacial nanofilms formed with neocuproine and 38 nm mean diameter AuNPs, at monolayer surface coverages and above, were black due to aggregation and broadband absorbance.

show abstract

Section: Mean Diameter Determination and Size Distributions Of The Comentioning

confidence: 99%

Self-healing gold mirrors and filters at liquid–liquid interfaces

et al. 2016

View full text Add to dashboard Cite

show abstract

“…As can be seen for Al, primarily due to the plasmonic NS in an environment with a higher refractive index than air ( n ZnO ~ 2.4) in the SC structure, the peaks of maximum near-field intensity are extended to higher wavelengths than the bulk case. The presence of multiple peaks at spectral maximum intensity can depend on numerous factors in the MNS, such as NP size distribution, NP distances, bipolar resonance, and higher modes such as quadrupole and longitudinal-transverse excitations [ 57 , 58 ]. As the height of the nanoparticles decreases in different modes of the O-group (O.1 to O.4), the location of the peaks shift so that the peaks become intensive at larger wavelengths.…”

Section: Resultsmentioning

confidence: 99%

Towards realistic modeling of plasmonic nanostructures: a comparative study to determine the impact of optical effects on solar cell improvement

Haidari

2022

J Comput Electron

View full text Add to dashboard Cite

Plasmonic structures may improve cell performance in a variety of ways. More accurate determining of the optical influence, unlike ideal simulations, requires modeling closer to experimental cases. In this modeling and simulation, irregular nanostructures were chosen and divided into three groups and some modes. For each mode, different sizes of nanoparticles were randomly selected, which could result in pre-determined average particle size and standard deviation. By 3D finite-difference time-domain (3D-FDTD), the optical plasmonic properties of that mode in a solar cell structure were investigated when the nanostructure was added to the buffer/active layer of the organic solar cell. The far- and near-field results were used to compare the plasmonic behavior, relying on the material and geometry. By detailed simulations, Al and Ag nanostructure at the interface of the ZnO/active layer can improve organic solar cell performance optically, especially by the near-field effect. Unlike Au and relative Ag, the Al nanostructured sample showed less parasitic absorption loss. Supplementary Information The online version contains supplementary material available at 10.1007/s10825-021-01829-x.

show abstract

“…UV-VIS diffuse reflectance spectra of SNDC fibers samples with variations in time of irradiation and microwave power are illustrated in ( Figure 2 ). Valley of the reflectance spectra in the range of 430–450 nm is due to the out plane quadrupole plasmon resonance and some partial color change are also due to localized surface plasmon resonance (LSPR) ( Kelly et al, 2003 ; Sherry et al, 2006 ; Shopa et al, 2010 ; Dankovich and Gray, 2011 ; Tang et al, 2012 ; Dankovich, 2014 ).…”

Section: Resultsmentioning

confidence: 99%

Power and Time Dependent Microwave Assisted Fabrication of Silver Nanoparticles Decorated Cotton (SNDC) Fibers for Bacterial Decontamination

et al. 2017

View full text Add to dashboard Cite

Plasmonic nanoparticles (NPs) such as silver and gold have fascinating optical properties due to their enhanced optical sensitivity at a wavelength corresponding to their surface plasmon resonance (SPR) absorption. Present work deals with the fabrication of silver nanoparticles decorated cotton (SNDC) fibers as a cheap and efficient point of contact disinfectant. SNDC fibers were fabricated by a simple microwave assisted route. The microwave power and irradiation time were controlled to optimize size and density of silver nanoparticles (SNPs) on textile fibers. As prepared cotton fabric was characterized for ATR-FTIR, UV-VIS diffuse reflectance, SEM and TEM investigations. Size of SNPs as well as total density of silver atoms on fabric gets increased with the increase of microwave power from 100 W to 600 W. The antibacterial efficacy of SNPs extracted from SNDC fibers was found to be more effective against Gram-negative bacteria than Gram-positive bacteria with MIC 38.5 ± 0.93 μg/mL against Salmonella typhimurium MTCC-98 and 125 ± 2.12 μg/mL against Staphylococcus aureus MTCC-737, a linear correlation coefficient with R2 ranging from ∼0.928–0.935 was also observed. About >50% death cells were observed through Propidium Iodide (PI) internalization after treatment of SNPs extracted from SNDC fibers with concentration 31.25 μg/mL. Generation of ROS and free radical has also been observed which leads to cell death. Excellent Escherichia coli deactivation efficacy suggested that SNDC fibers could be used as potentially safe disinfectants for cleaning of medical equipment, hand, wound, water and preservation of food and beverages.

show abstract

Dipole and quadrupole surface plasmon resonance contributions in formation of near-field images of a gold nanosphere

Cited by 26 publications

References 33 publications

Self-healing gold mirrors and filters at liquid–liquid interfaces

Self-healing gold mirrors and filters at liquid–liquid interfaces

Towards realistic modeling of plasmonic nanostructures: a comparative study to determine the impact of optical effects on solar cell improvement

Power and Time Dependent Microwave Assisted Fabrication of Silver Nanoparticles Decorated Cotton (SNDC) Fibers for Bacterial Decontamination

Contact Info

Product

Resources

About