Optical properties of small inorganic and organic metal particles

Papavassiliou, George C.

doi:10.1016/0079-6786(79)90001-3

Cited by 399 publications

(284 citation statements)

References 543 publications

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“…When the electron transfer is carried out with less energy, the UV-Vis spectrum shifted to the longer wavelengths [32][33][34][35][36]. Hence, if the number of gold atoms increases in the cluster, the corresponding UV-Vis spectrum will have longer wavelength rather than the spectrum of gold clusters with fewer numbers of atoms.…”

Section: Resultsmentioning

confidence: 99%

Fabrication of capped gold nanoparticles by using various amino acids

Zare

Khoshnevisan

Barkhi

et al. 2013

Journal of Experimental Nanoscience

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The production of gold nanoparticles (GNPs) by amino acid is one of the most attractive and interesting subjects in nanobiotechnology. In this study, amino acids have been utilised as a reducing agent and also an agent for capping GNPs. The GNPs were prepared using a reduction solution containing gold cations with optimum concentration of gold salt (5 mM), and also functionalised by glutamic acid, phenylalanine and tryptophan with optimum concentration of amino acids (25 mM). The optimum condition of gold solution and amino acids were achieved by ultraviolet-visible spectroscopy. The size of nanoparticles was obtained 5-20, 10-20 and 20-30 nm, respectively, by transmission electron microscopy and dynamic light scattering techniques. The results obtained from experimental and quantum calculations confirm that amino acids have strong bond while they have anion binding. Moreover, the free carboxylic groups of capped GNPs are one of the suitable and capable beads for binding biological agents. As a result, the medical applications of amino acids and proteins can be used as a practical method due to the strong interaction of peripheral amine groups with nanoparticles.

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Section: Resultsmentioning

confidence: 99%

Fabrication of capped gold nanoparticles by using various amino acids

Zare

Khoshnevisan

Barkhi

et al. 2013

Journal of Experimental Nanoscience

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“…Two main plasmon resonances are visible at 1.45 eV and 3.45 eV, corresponding to the two characteristic LSP resonances of the rod along its long (longitudinal) and short (transverse) axes, respectively. 30 The narrower peak at 3.85 eV corresponds to the bulk plasmon of the structure.…”

Section: Imaging Surface Plasmons With Electron Energy Loss Spectroscopymentioning

confidence: 99%

Visualizing surface plasmons with photons, photoelectrons, and electrons

El‐Khoury

Abellán

Gong

et al. 2016

Analyst

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Both photons and electrons may be used to excite surface plasmon polaritons, the collective charge density fluctuations at the surface of metal nanostructures. By virtue of their nanoscopic and dissipative nature, a detailed characterization of surface plasmon (SP) eigenmodes in real space-time ultimately requires joint nanometer spatial and femtosecond temporal resolution.The latter realization has driven significant developments in the past few years, aimed at interrogating both localized and propagating SP modes. In this mini-review, we briefly highlight different techniques employed by our own groups to visualize the enhanced electric fields associated with SPs. Specifically, we discuss recent hyperspectral optical microscopy, tipenhanced Raman nano-spectroscopy, nonlinear photoemission electron microscopy, as well as correlated scanning transmission electron microscopy-electron energy loss spectroscopy measurements targeting prototypical plasmonic nanostructures and constructs. Through selected practical examples from our own laboratories, we examine the information content in multidimensional images recorded by taking advantage of each of the aforementioned techniques. In effect, we illustrate how SPs can be visualized at the ultimate limits of space and time.

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“…The physical origin of the strong light absorption by noble metal nanoparticles is the coherent oscillation of the conduction band electrons induced by interaction with an electromagnetic field. These resonances are known as surface plasmons (17)(18)(19)(20) and are a small particle as well as a surface effect because they are absent in the individual atoms as well as in the bulk. Their extinction coefficient scales with the volume of the particles and can reach values several orders of magnitude larger compared to common organic dye molecules (9a,b,c).…”

Section: Introductionmentioning

confidence: 99%

“…Spectroscopic methods probe the energy differences between two states for allowed transitions as well as the lifetimes of excited states and their respective energy relaxation channels using time-resolved techniques. The size effect on the optical absorption spectra of metallic nanocrystals is probably best known for the noble metal nanoparticles (17)(18)(19)(20). Indeed, metallic nanoparticles have fascinated scientists since the Middle Ages because of their colorful 332 LINK EL-SAYED colloidal solutions (21).…”

Section: Introductionmentioning

confidence: 99%

Optical Properties and Ultrafast Dynamics of Metallic Nanocrystals

Link¹,

El‐Sayed

2003

Annu. Rev. Phys. Chem.

1,531

1,499

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Noble metal particles have long fascinated scientists because of their intense color, which led to their application in stained glass windows as early as the Middle Ages. The recent resurrection of colloidal and cluster chemistry has brought about the strive for new materials that allow a bottoms-up approach of building improved and new devices with nanoparticles or artificial atoms. In this review, we discuss some of the properties of individual and some assembled metallic nanoparticles with a focus on their interaction with cw and pulsed laser light of different energies. The potential application of the plasmon resonance as sensors is discussed.

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Optical properties of small inorganic and organic metal particles

Cited by 399 publications

References 543 publications

Fabrication of capped gold nanoparticles by using various amino acids

Fabrication of capped gold nanoparticles by using various amino acids

Visualizing surface plasmons with photons, photoelectrons, and electrons

Optical Properties and Ultrafast Dynamics of Metallic Nanocrystals

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