Abstract
This paper reports the facile and high-throughput fabrication method of anisotropic Au nanoparticles with a highly sensitive local surface plasmon resonance (LPR) using cylindrical nanofibers as substrates. The substrates consisting of nanofibers were prepared by the electrospinning of poly(vinylidene fluoride) (PVDF). The Au nanoparticles were deposited on the surface of electrospun nanofibers by vacuum evaporation. Scanning electron microscopy revealed the formation of a curved Au island structure on the surface of cylindrical nanofibers. Polarized UV-visible extinction spectroscopy showed anisotropy in their LPR arising from the high surface curvature of the nanofiber. The LPR of the Au nanoparticles on the thinnest nanofiber with a diameter of ~100 nm showed maximum refractive index (RI) sensitivity over 500 nm/RI unit (RIU). The close correlation between the fiber diameter dependence of the RI sensitivity and polarization dependence of the LPR suggests that anisotropic Au nanoparticles improve RI sensitivity.
Highlights
In this decade, local surface plasmons (LPRs) in Au and Ag nanoparticles, which have been used in stained-glass in medieval European churches, have received a great deal of attention from researchers in optics, biochemistry, biogenetics, and medical science, due to their fascinating optical characteristics
This paper reported the facile and high-throughput fabrication method of anisotropic curved Au nanoparticles with a highly sensitive local surface plasmon resonance (LPR) using the cylindrical surface of electrospun nanofibers
scanning electron microscope (SEM) observations and polarized extinction spectroscopy revealed the formation of the curved Au islands on the nanofibers
Summary
Local surface plasmons (LPRs) in Au and Ag nanoparticles, which have been used in stained-glass in medieval European churches, have received a great deal of attention from researchers in optics, biochemistry, biogenetics, and medical science, due to their fascinating optical characteristics One is their ability to enhance the light field intensity. The light field resonant with LPR is dramatically enhanced around the surface of the nanoparticle, which allows us to obtain an optical signal from single molecules This enhancement effect is fairly effective in Raman scattering [1,2,3,4,5], fluorescence [6, 7], and nonlinear optical phenomena [8]. These LPR characteristics can be utilized with a single nanoparticle [18, 19]; the nanoparticle with the LPR was often expected to be an in vivo nanosensor or an in vivo nanosensitizer detecting biochemical materials in living cells or animals [20, 21]
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