On the application potential of gold nanoparticles in nanoelectronics and biomedicine

Homberger, Melanie; Simon, Ulrich

doi:10.1098/rsta.2009.0275

Cited by 245 publications

(190 citation statements)

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“…UV light leads to ring-closing reaction of molecules (colored solution) and visible light induces reversible ring-opening reaction (solution bleaching). Therefore, the observed changes of the light absorbance in Fig.4a can be attributed to reversible switching of YnPhT molecules covalently bound to AuNP surface, since UV/visible irradiation is known to induce no modification of the intensity of the LSPR of bare AuNP [51][52][53] . To demonstrate reversible switching we performed several OF→CF→OF cycles (Fig.…”

Section: Resultsmentioning

confidence: 99%

Optical properties of gold nanoparticles decorated with furan-based diarylethene photochromic molecules

Snegir

Khodko

Sysoiev

et al. 2017

Journal of Photochemistry and Photobiology A: Chemistry

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Section: Resultsmentioning

confidence: 99%

Optical properties of gold nanoparticles decorated with furan-based diarylethene photochromic molecules

Snegir

Khodko

Sysoiev

et al. 2017

Journal of Photochemistry and Photobiology A: Chemistry

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“…Additionally, methods for fabricating non-ordered large surface materials of gold, silver and palladium are presented. Homberger & Simon's (2010) article not only deals with the electronic situation of gold clusters and nanoparticles with respect to future applications in nanodevices, but also with the interaction of selected gold systems with biomolecules. The transition from innocent bulk gold to highly cell-toxic nanoparticles is of promising relevance (see cover picture).…”

Section: Metal Clusters and Nanoparticlesmentioning

confidence: 99%

Metal clusters and nanoparticles

Schmid

Fenske

2010

Phil. Trans. R. Soc. A.

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There is still no sharp discrimination between the terms 'cluster' and 'nanoparticle' in the literature. Clusters are mostly considered as species, exactly defined in chemical composition and structure, whereas the expression 'nanoparticle' usually means particles of less precise characterization, often linked with a certain size distribution and so to some extent substitutes the historical expression 'colloid'. Examples for typical and long-known clusters are Co 4 (CO) 12 or Rh 6 (CO) 16 , exhibiting bridging and terminal CO groups as well as direct metal-metal bonds. Gold nanoparticles (gold colloids), for instance, were already used in ancient times to colour glass (ruby glass) without any scientific understanding. The first who scientifically investigated gold colloid formation was Michael Faraday in the mid-nineteenth century. He reduced a solution of HAuCl 4 with elemental phosphorus resulting in the formation of ruby-red gold sols. In the meantime, we learned that the reason for this colour is due to the interaction of visible light with surface electrons of the gold nanoparticles (Mie theory). As we know today, the colour depends on size, shape and surrounding medium. Faraday's original gold sols contained sub-30 nm gold particles with a rather broad size distribution. Nowadays, the number of precise metal clusters and of less precise metal nanoparticles is immense.From physical and chemical properties, large metal clusters and nanoparticles represent a bridge between the molecular and solid state. As such, they often exhibit properties belonging to both of these classical disciplines and therefore are of immense scientific and practical interest. The aspect that the property of a metallic particle can be designed by the number of atoms is a driving force in modern physics and chemistry. For the size dependence of physical and chemical properties, the expression 'size quantization' has been introduced. Clusters or nanoparticles, consisting of metal atoms only, change their physical properties spontaneously from a distinct size on. Metal particles below about 2 nm show typical quantum size behaviour, even at room temperature owing to the existence of discrete electronic energy levels and the loss of overlapping electronic bands, the characteristic of a bulk metal. Therefore, they are also called 'artificial big atoms' and are to be considered as links between bulk metals and small molecular clusters.Besides the exciting electronic changes on the way from bulk to molecule or vice versa, other properties change too. For instance, small metal nanoparticles show a significantly lower melting point than the corresponding bulk metal. Magnetic and optical properties also show a typical dependence on the particle size, and the band gap of semiconductor clusters also varies significantly with size. Many methods for the generation of metal clusters and of metal nanoparticles have been developed since Faraday's experiments. In principle, two different procedures have become known: top down and bottom up. Top-down ...

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“…Nanomaterials have been widely investigated for biomedical applications, such as drug delivery, bioimaging, photothermal cancer treatment [1][2][3][4][5]. Metallic nanoparticles, due to their nature of good biocompatibility, being easy of preparation, and strong absorption and scattering effect of light laser, are ideal candidates for photothermal cancer treatment.…”

Section: Introductionmentioning

confidence: 99%

Investigation of laser heating effect of metallic nanoparticles on cancer treatment

Shan

Liu

Chen

et al. 2016

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. Metallic nanoparticles can be applied for hyperthermia therapy of cancer treatment to enhance the efficacy because of their high absorption rate. The absorption of laser energy by metallic nanoparticles is strongly dependent on the concentration, shape, material of nanoparticles and the wavelength of the laser. However, there is no systematic investigation on the heating effect involving different material, concentration and laser wavelength. In this paper, gold nanoparticles (AuNPs), sliver nanoparticles (AgNPs) and sliver nanowires (AgNWs) with different concentrations are heated by 450nm and 532nm wavelength laser to investigate the heating effect. The result shows that the temperature distribution of heated metallic nanoparticles is non-uniform.

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On the application potential of gold nanoparticles in nanoelectronics and biomedicine

Cited by 245 publications

References 168 publications

Optical properties of gold nanoparticles decorated with furan-based diarylethene photochromic molecules

Optical properties of gold nanoparticles decorated with furan-based diarylethene photochromic molecules

Metal clusters and nanoparticles

Investigation of laser heating effect of metallic nanoparticles on cancer treatment

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