Localized surface plasmon resonance of single silver nanoparticles studied by dark-field optical microscopy and spectroscopy

Cao, Wei; Huang, Tao; Xu, Xiaohong; Elsayed-Ali, Hani E.

doi:10.1063/1.3544349

Cited by 33 publications

(23 citation statements)

References 31 publications

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“…Generally, the LSPR wavelength of a metal NP will blue shift when it changes from an anisotropic shape into an isotropic sphere along with the decrease of particle size. 13 However, the scattering light of an AgNC shifted to a longer wavelength before it disappeared in our work. These illogical phenomena might be attributed to the change of the surface status of AgNCs at the initial stage of the etching process.…”

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confidence: 52%

Real-time monitoring of oxidative etching on single Ag nanocubes via light-scattering dark-field microscopy imaging

Wang

Zou

2015

Nanoscale

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A low-cost and easily-conducted light-scattering dark-field microscopy imaging (iDFM) technique for real-time and in situ monitoring of the oxidative etching on a single Ag nanocube was presented by using an ordinary dark-field microscopy system, which provides an alternative approach to study the behaviors of metal nanoparticles in chemical reactions and biological processes at the single nanoparticle level.

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contrasting

confidence: 52%

Real-time monitoring of oxidative etching on single Ag nanocubes via light-scattering dark-field microscopy imaging

Wang

Zou

2015

Nanoscale

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“…Also, because of the higher charge densities on the larger nanoparticle, the intensity of LSPR increases. When two nanoparticles are placed next to each other closer than a distance equal or smaller than 2.5 times of the particle diameter, interparticle near field coupling occurs [4,17,47]. Oppositely, the particle behaves as a single-particle dipole mode.…”

Section: Resultsmentioning

confidence: 99%

“…When the aspect ratio (the ratio of the diameter of nanoparticles to its height) of the disk-like shaped nanoparticles increases, the wavelength increases [10,11,14,17].…”

mentioning

confidence: 99%

Effect of Ar Gas Pressure on LSPR Property of Au Nanoparticles: Comparison of Experimental and Theoretical Studies

et al. 2020

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In this study, the thin films were produced by using pulsed laser deposition (PLD) technique from gold (Au) nanoparticles deposited on two kinds of substrates under different argon (Ar) gas pressure. Microscope glass slides and silicon (100) wafers were used as amorphous and crystal substrates. The films were deposited under 2 × 10−3 mbar, 1 × 10−2 mbar, 2 × 10−2 mbar argon (Ar) ambient gas pressure. Effect of the background gas pressure on the plasma plume of the ablated Au nanoparticles was investigated in details. Morphology of Au nanoparticle thin films was investigated by means of atomic force microscopy (AFM) technique. Absorption spectra of Au nanoparticles were examined by using UV-Vis spectrometry. Extinction spectra of Au nanoparticles were calculated by using metallic nano particles boundary element method (MNPBEM) simulation programme. Both experimental spectra and simulation data for Au nanoparticles were obtained and compared in this work. It was concluded that they are also in good agreement with literature data. The measurements and the simulation results showed that localized surface plasmon resonance (LSPR) peaks for Au nanoparticles were located in the near infrared region (NIR) because of the larger size of the disk-like shape of Au nanoparticles, and the near-field coupling between Au nanoparticles. It was demonstrated that as the ambient gas (Ar) pressure was increased, the size and the density of Au nanoparticles on the substrate were decreased and the LSPR peak shifts toward the short wavelength region in the spectrum. This shift has been explained by the changes in the morphology of produced thin films.

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“…The color change occurs due to the effect of superficial plasmon resonance (SPR) and the reduction of AgNO 3 (Li et al, 2012). SPR refers to the collective oscillation of free electrons in the metallic nanoparticles when they interact with electromagnetic radiation (Cao et al, 2011;González et al, 2014;Al Juraifani and Ghazwani, 2015).…”

Section: Silver Nanoparticles Biosynthesismentioning

confidence: 99%

Silver nanoparticles biosynthesis and impregnation in cellulose acetate membrane for anti-yeast therapy

Silva¹,

Andrade²,

Segala³

et al. 2017

Afr. J. Biotechnol.

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Silver nanoparticles (AgNPs) are nanoforms that express higher antimicrobial potential due to their shape and reduced size. The use of fungi to mediate the synthesis of AgNPs has increased the interest of scientists because of their rapid growth, large-scale cultivation and secretion of non-toxic molecules. The aim of this study was to synthesize AgNPs mediated by Aspergillus oryzae DPUA 1624 and evaluate the antimicrobial activity of these molecules incorporated in cellulose acetate nanomembranes (NanoMAC). The synthesis of AgNPs was confirmed by UV-visible spectroscopy and the characterization was performed by dynamic light scattering, transmission electron microscopy, X-ray diffraction, X-ray dispersive energy and advanced spectroscopy and spectroscopy methods. The synthesis of the membrane was done by electro-spinning and its thickness was analyzed in scanning electron microscope. The AgNPs were added to NanoMAC and the antimicrobial effect was evaluated by agar diffusion method against Staphylococcus aureus, Escherichia coli and Candida albicans. The aqueous extract of A. oryzae mediated the synthesis of AgNPs with rounded and some triangular shapes. The diameter and zeta potential of these particles were 61.15±11.45 nm and-28.7 mv, respectively. The NanoMAC with AgNPs showed an increase in antifungal activity of 24.22% when tested against C. albicans. This study demonstrated that A. oryzae is able to mediate AgNP synthesis with anti-yeast action and the impregnation of AgNPs in acetate cellulose nanomembranes resulted in the development of a more efficient antimicrobial nanocomposite.

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Localized surface plasmon resonance of single silver nanoparticles studied by dark-field optical microscopy and spectroscopy

Cited by 33 publications

References 31 publications

Real-time monitoring of oxidative etching on single Ag nanocubes via light-scattering dark-field microscopy imaging

Real-time monitoring of oxidative etching on single Ag nanocubes via light-scattering dark-field microscopy imaging

Effect of Ar Gas Pressure on LSPR Property of Au Nanoparticles: Comparison of Experimental and Theoretical Studies

Silver nanoparticles biosynthesis and impregnation in cellulose acetate membrane for anti-yeast therapy

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