The Role of Silver and Gold Nanoparticles in Enhancing Luminescence of Europium Complexes

Abstract

The influence of 12 nm spherical silver nanoparticles (AgNPs) and 20 nm spherical gold nanoparticles (AuNPs) on the luminescence of europium complex Eu(TTFA)3 were studied. When 350 nm is chosen as the incident light, the maximum enhancement factor of the complexes mixed with AgNPs is about 2.5 at the wavelength of 612 nm. Besides the enhancement of the localized field, the overlap between the localized surface plasmon resonance spectra of nanoparticles and the absorption band of fluorescent molecules is another important factor for excitation field enhancement. By means of the quasi-static approximation theory, the distribution of the electric field around a single spherical metallic nanopaticle illuminated by plane wave was calculated. The simulation results show that the field enhancement effect is more obvious when the incident light is close to the resonance of the metallic nanoparticle, which could be demonstrated by our following experimental results. The distribution of the electric field under the same conditions was also simulated through the COMSOL software. The results are consistent with those of the quasi-static approximation theory.

Metal-enhanced fluorescence effect of Ag and Au nanoparticles modified with rhodamine derivative in detecting Hg2+

“…11 shows that both absorption spectra of Ag-HMS and Au-HMS overlapped with the fluorescence emission spectrum of rhodamine derivative R at about 580 nm. In this case an enhancement occurs when both the excitation and the fluorescence signals are near the LSPR peak [46,47]. Furthermore, the LSPR absorption band of Ag-HMS was much wider than that of Au-HMS.…”

Como Obter Nanopartículas De Ouro Usando Suco De Limão?

“…17 Além disso, o diâmetro reduzido desses materiais facilita a sua entrada no interior das células, possibilitando uma série de diagnósticos, imageamentos e tratamentos intracelulares. 18 Diversos compostos podem ser incorporados às partículas de ouro agregando propriedades específicas destes compostos no material. 19 Por essa razão, nanopartículas de ouro, modificadas ou não, possuem aplicação em diversas áreas como óptica, eletrônica, magnética e catálise.…”

Resonance fluorescence of a two-level quantum emitter near a plasmonic nanoparticle: role of the near-field polarization

“…It has also been shown that the lifetime of the excited state of an emitter located near a nanostructure is affected by the radiative decay rate due to photon emission and by the nonradiative decay rate due to energy dissipation in the environment. Furthermore, both of these rates can be enhanced [2][3][4][5][6][7][8][9]. This results in the possibility of using quant um emitters as ideal near-field sensors around plasmonic nanostructures, and this important application has been verified experimentally [10][11][12][13][14][15][16][17].…”