Aspect ratio dependent fluorescence quenching of eosin Y by gold nanorods.

Aspect ratio dependent fluorescence quenching of eosin Y by gold nanorods.

Journal of nanoscience and nanotechnology (2014-04-18)

Guojun Weng, Jianjun Li, Li Zhang, Junwu Zhao

초록

Gold nanorods of different aspect ratios had been synthesized using seed mediated growth method. The formed gold nanorods had been characterized by the absorption and transmission electron microscopy (TEM) measurements. The obtained gold nanorods were used to study the quenched effect on fluorescence of Eosin Y. Experimental results revealed that Eosin Y molecules adsorbed on the metallic surfaces, suffering strong quenching of their fluorescence and the quenching efficiency was different for different aspect ratio. Using dielectric coated gold nanorods model, the probable mechanism of aspect ratio dependent quenching efficiency was obtained by numerical calculation based on fluorescence resonance energy transfer and quasi-static theory. The calculation results showed that the non-monotonic changing of fluorescence quenching was attributed to competing effects of aspect ratio and the dielectric constant of coated shell on surface plasmon resonance.

MATERIALS

제품 번호

브랜드

제품 설명

349283

Sigma-Aldrich

Gold, wire, diam. 0.1 mm, 99.99% trace metals basis

310980

Sigma-Aldrich

Gold, wire, diam. 0.5 mm, 99.99% trace metals basis

326542

Sigma-Aldrich

Gold, beads, 1-6 mm, 99.999% trace metals basis

326534

Sigma-Aldrich

Gold, wire, diam. 0.25 mm, ≥99.9% trace metals basis

349305

Sigma-Aldrich

Gold, wire, diam. 1.0 mm, 99.997% trace metals basis

265829

Sigma-Aldrich

Gold, foil, thickness 0.5 mm, 99.99% trace metals basis

230251

Sigma-Aldrich

Eosin Y, 75% (HPLC)

318906

Sigma-Aldrich

Eosin Y solution, 5 wt. % in H₂O

373168

Sigma-Aldrich

Gold, evaporation slug, diam. × L 0.6 cm × 0.6 cm, 99.99% trace metals basis

349240

Sigma-Aldrich

Gold, foil, thickness 0.25 mm, ≥99.9% trace metals basis

349275

Sigma-Aldrich

Gold, foil, thickness 0.05 mm, 99.99% trace metals basis

326585

Sigma-Aldrich

Gold, powder, <10 μm, ≥99.9% trace metals basis

326526

Sigma-Aldrich

Gold, wire, diam. 0.127 mm, 99.99% trace metals basis

265837

Sigma-Aldrich

Gold, rod, diam. 3.0 mm, 99.99% trace metals basis

265772

Sigma-Aldrich

Gold, powder, <45 μm, 99.99% trace metals basis

E4009

Sigma-Aldrich

Eosin Y, Dye content ~99 %

E6003

Sigma-Aldrich

Eosin Y disodium salt, Dye content ≥85 %

E4382

Sigma-Aldrich

Eosin Y disodium salt, certified by the Biological Stain Commission

GF72963221

Gold, insulated wire, 0.5m, conductor diameter 0.125mm, insulation thickness 0.014mm, polyester insulation, 99.99%

GF92307922

Gold, insulated wire, 5m, conductor diameter 0.05mm, insulation thickness 0.007mm, polyester insulation, 99.99%

GF37996789

Gold, tube, 200mm, outside diameter 2.0mm, inside diameter 1.7mm, wall thickness 0.15mm, as drawn, 99.95%

GF59949264

Gold, tube, 200mm, outside diameter 1.0mm, inside diameter 0.5mm, wall thickness 0.25mm, as drawn, 99.95%

GF73794741

Gold, tube, 200mm, outside diameter 2.0mm, inside diameter 1.8mm, wall thickness 0.1mm, as drawn, 99.95%

GF54796304

Gold, insulated wire, 1m, conductor diameter 0.05mm, insulation thickness 0.007mm, polyester insulation, 99.99%

GF22371319

Gold, rod, 25mm, diameter 4.0mm, as drawn, 99.95%

GF05586969

Gold, tube, 100mm, outside diameter 3.0mm, inside diameter 2.8mm, wall thickness 0.10mm, as drawn, 99.95%

GF25294620

Gold, microfoil, disks, 10mm, thinness 0.01μm, specific density 20.7μg/cm², permanent mylar 3.5μm support, 99.99+%

GF88214542

Gold, insulated wire, 1m, conductor diameter 0.05mm, insulation thickness 0.007mm, polyimide insulation, 99.99%

GF47078129

Gold, microleaf disks, 10mm, thinness 0.5μm, specific density 966μg/cm², removable support, 99.99+%

GF43173930

Gold, rod, 25mm, diameter 3.0mm, as drawn, 99.95%